KR101526325B1 - Single nanowires with ambipolar photoresponse - Google Patents

Single nanowires with ambipolar photoresponse Download PDF

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KR101526325B1
KR101526325B1 KR1020140013776A KR20140013776A KR101526325B1 KR 101526325 B1 KR101526325 B1 KR 101526325B1 KR 1020140013776 A KR1020140013776 A KR 1020140013776A KR 20140013776 A KR20140013776 A KR 20140013776A KR 101526325 B1 KR101526325 B1 KR 101526325B1
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nanowire
type
pedot
pss
photoreactivity
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제정호
유제원
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포항공과대학교 산학협력단
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
    • B82B1/00—Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
    • B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
    • B82B3/0095—Manufacture or treatments or nanostructures not provided for in groups B82B3/0009 - B82B3/009

Abstract

The present invention relates to a single nanowire having bipolar photoreactivity, and more particularly, to a single-nanowire hybrid organic-inorganic nanowire whose signal changes according to the wavelength of light. The nanowire according to the present invention is manufactured by growing a nanometer-sized inorganic material-organic hybrid material by a meniscus induction method, and is spectrally distinguishable.

Description

[0001] SINGLE NANOWIRES WITH AMBIPOLAR PHOTORESPONSE [0002]

The present invention relates to a single nanowire having bipolar photoreactivity, and more particularly, to a single-nanowire hybrid organic-inorganic nanowire whose signal changes according to the wavelength of light.

BACKGROUND OF THE INVENTION [0002] Optoelectronic devices have received great interest in a variety of applications utilizing light, including light generation, propagation, detection and modulation. In particular, nanowire optoelectronic devices with photoelectric properties, such as nanowire photodetectors and optical switches, are essential elements in optical communication and optical interconnects in nanofiber circuits. In conventional photoconductors, positive photoreactivity is observed by generating a mobile charge carrier in a valence band and / or a conduction band, generally under irradiation of light. 2. Description of the Related Art In recent years, the photoreactivity of bipolar (positive / negative) in which a signal changes according to the wavelength of light or an external stimulus has been widely used in multifunctional optoelectronic devices such as a photo-gate transistor, an optical switch, .

However, a device having bipolar photoreactivity is limited to a two-dimensional thin film form up to now, and a study on a single nanowire has not been reported in particular. In addition, a method of integrating a single nanowire at a desired position is known as an important issue for implementing a nanowire-based device. Recently, despite the development of a flow-assisted alignment method, a Langmuir blodgett approach and a microcontact printing method using a fluid flow, a single nanowire at a desired position It is still difficult to integrate directly.

International Patent Application WO-A-2011/90226 discloses a method for producing high-aspect-ratio three-dimensional conductive polymer micro-wires using a micropipette local chemical polymerization method and a technique for the conductive polymer micro-wires and wiring fabricated thereby.

An object of the present invention is to produce a single nanowire having bipolar (positive / negative) photoreactivity in which the signal changes according to the wavelength of light. Specifically, the object of the present invention is to produce a single nanowire grown by the meniscus induction method using an inorganic-organic hybrid material. The patent also describes a photodetector array implementation capable of spectral identification by integrating a single inorganic-organic hybrid nanowire array at a desired location.

The present invention relates to a method for producing a single nanowire having bipolar light reactivity, which comprises mixing a solution containing a p-type polymer material having a bandgap in a visible light region and a solution containing an n-type inorganic substance having a band gap in the ultraviolet region Thereby producing a blend solution; And preparing a single nanowire with the blend solution using a meniscus induction method.

Preferably, the p-type polymer material is selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy) Poly (2-methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV).

Preferably, the n-type inorganic material is one selected from the group consisting of ZnO, ZnS and TiO 2 .

Preferably, the step of preparing a single nanowire with the blend solution using a meniscus induction method comprises the steps of: filling the glass micro tube with the blend solution; Contacting the glass microtubule with a substrate to form a meniscus; Forming a columnar structure by vertically pulling the glass microtubes to induce solidification of the solution exposed to the air; And removing the glass microtubules to form nanowires.

Preferably, the solution containing the p-type high molecular substance is a mixture of the solvent and the p-type high molecular substance and comprises 1% by weight to 5% by weight of the p-type high molecular weight substance based on the total weight.

Preferably, the single nanowire comprises 20% to 50% by weight of the n-type inorganic material relative to the total weight of the nanowire.

The present invention also relates to a single nanowire having a bipolar photoreactivity comprising an n-type inorganic material to a p-type high molecular weight material in a weight ratio of 2: 8 to 5: 5.

Preferably, the n-type inorganic material is one selected from the group consisting of ZnO, ZnS and TiO 2 .

Preferably, the p-type polymer material is selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy) Poly (2-methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV).

In accordance with the present invention, a single nanowire photodetector array capable of identifying a spectrum can be developed. A single nanowire with bipolar photoreactivity will be a useful method for the development of optoelectronic nanodevices with diverse functionality.

1 schematically shows a method for producing a single nanowire having a photoreactivity of bipolarity. 1 (a) shows traction of a micropipette filled with a ZnO nanoparticle (hereinafter NPs) -PEDOT: PSS blend solution in the growth direction. FIG. 1 (b) shows direct integration of a single inorganic-organic hybrid nanowire at a desired position using a meniscus induction method.
FIG. 2 (a) shows an FE-SEM image of a single hybrid nanowire integrated between Au-Au electrodes, and FIG. 2 (b) shows an EDS spectrum of a white dotted circle region in FIG.
Figure 3 shows the relative current density under visible light (VIS) and ultraviolet (UV) of a single hybrid nanowire with ZnO NPs concentration. The inserted figure again shows the relative current density under ultraviolet light when the concentration of ZnO nano powder is 0 to 20% by weight with respect to the total weight of the nanowire.
Figure 4 shows the change in relative current density [Delta] j of single nanowires periodically exposed to ultraviolet (or visible) light. (a) shows PEDOT: PSS single nanowire, (b) 20 wt% ZnO NPs-PEDOT: PSS single nanowire, and (c) 30 wt% ZnO NPs-PEDOT: PSS single nanowire.
Figure 5 shows ultraviolet-visible light absorption and FT-IR analysis. 5 (a) shows ultraviolet-visible light absorption spectra of a ZnO NPs-PEDOT: PSS hybrid film coated on quartz glass, and FIG. 5 (b) shows a 50 wt% ZnO NPs-PEDOT: PSS hybrid The FT-IR spectrum of the film is shown.
Figure 6 shows the individual integration of a single hybrid (30 wt% ZnO NPs-PEDOT: PSS) nanowire (r ~ 250 nm, l ~ 75 um) array for a spectrum-identifiable photodetector array. 6 (a) is a schematic view of a single hybrid nanowire integrated in a heart shape on a substrate on which Au electrodes are patterned, and FIG. 6 (b) is an optical image of the nanowire of FIG. 6 (a). Fig. 6 (c) shows a pattern of degree of photoreaction of a single hybrid nanowire having bipolar photoreactivity.

Unless defined otherwise, all technical terms used in the present invention have the following definitions and are consistent with the meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Also, preferred methods or samples are described in this specification, but similar or equivalent ones are also included in the scope of the present invention.

The term " meniscus " in the present invention means a curved surface formed by the liquid surface of the tube due to the interfacial tension. Depending on the nature of the liquid, the liquid surface becomes concave or convex.

The present invention relates to a method for producing a single nanowire having bipolar light reactivity, which comprises mixing a solution containing a p-type polymer material having a bandgap in a visible light region and a solution containing an n-type inorganic substance having a band gap in the ultraviolet region Thereby producing a blend solution; And preparing a single nanowire with the blend solution using a meniscus induction method.

The p-type polymeric material may be selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy), poly- Methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV). However, the present invention is not limited thereto, and may include any material having a band gap in the visible light region out of the p-type high molecular substance.

The n-type inorganic material may be one selected from the group consisting of ZnO, ZnS, and TiO 2 . However, the present invention is not limited thereto, and may include all materials having a band gap in the ultraviolet region of the n-type inorganic material.

The solution containing the p-type polymeric substance may be a mixture of the solvent and the p-type polymeric substance, and may include 1% by weight to 5% by weight of the p-type polymeric substance based on the total weight. If less than 1 wt% or more than 5 wt%, it is difficult to implement nanowires. Preferably the solvent is water.

The solution containing the n-type inorganic substance may be a mixture of the solvent and the n-type inorganic substance. The solvent is preferably water. The n-type inorganic material may be about 11% to 100% by weight based on the weight of the p-type high molecular weight material contained in the solution containing the p-type high molecular weight material. That is, the n-type inorganic material may be included in an amount of 20% by weight to 50% by weight based on the total weight of the single nanowires produced after evaporation of the solvent. The amount of solvent may be an amount sufficient to disperse the nanomineral into the solvent.

Preparing a single nanowire from the blend solution using a meniscus inducing method comprises: filling the glass micro tube with the blend solution; Contacting the glass microtubule with a substrate to form a meniscus; Forming a columnar structure by vertically pulling the glass microtubes to induce solidification of the solution exposed to the air; And removing the glass microtubule to form a nanowire.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 schematically shows a method for producing a single nanowire having a photoreactivity of bipolarity.

Figure 1 (a) schematically illustrates the growth of ZnO NPs-PEDOT: PSS hybrid nanowires. When the micropipette is almost in contact with the substrate, the meniscus of the blend solution is created in the opening of the micropipette. When towing a micropipette (radius r 0 about 0.6 ㎛), the meniscus is stretching, a cross section of it is reduced to nano-scale are generated nanowire, and as a solvent (water) evaporates. By continuing traction, free standing, high aspect ratio hybrid nanowires are grown. The diameter r of the wire can be precisely adjusted by adjusting the traction speed v. After the solvent has evaporated, the finally prepared single nanowire may contain 20 wt% to 50 wt% of n-type inorganic material based on the total weight of the nanowire.

Another object of the present invention is to prepare a single nanowire having a photoreactivity of bipolarity containing an n-type inorganic material to a p-type high molecular weight material in a weight ratio of 2: 8 to 5: 5. That is, the n-type inorganic material may include 20 wt% to 50 wt% of the total weight of the single nanowire. The n-type inorganic material may be one selected from the group consisting of ZnO, ZnS, and TiO 2 . The p-type polymeric material may be selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy), poly- Methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV).

The upper diagram of Fig. 1 (b) shows the direct writing of the hybrid nanowires through the meniscus induction by manipulating the micropipette in the triaxial direction. In order to form nanowires connected between the electrodes, the meniscus at the end of the free standing nanowire is moved to and contacted with the second electrode so that the meniscus under the micropipette makes contact between the end of the nanowire and the second electrode . Next, when the micropipette is rapidly pulled vertically, the nanowire tip and the second electrode are connected due to the solidification of the remaining meniscus. That is, a second bond is formed. This technology allows us to precisely integrate a single hybrid nanowire at a desired location by individually manipulating the micropipette and substrate with three axes of motion (accuracy: 250 nm).

The field emission scanning electron microscope (FE-SEM) image of FIG. 2 (a) shows a single hybrid nanowire (r (radius) of about 250 nm and 1 (length) of about 75 μm) integrated on Au electrodes. The EDS spectrum of FIG. 2 (b) is the spectrum of the white dotted circle region of the single hybrid nanowire of 2 (a), indicating the presence of C, O, Zn and S elements of PEDOT: PSS and ZnO NPs Most O peaks are derived from SiO 2 / Si substrates).

Figure 3 shows the relative current density under visible light (VIS) and ultraviolet (UV) of a single hybrid nanowire with ZnO NPs concentration. The inserted figure again shows the relative current density under ultraviolet light when the concentration of ZnO nano powder is 0 to 20% by weight with respect to the total weight of the nanowire. This measurement was performed under 1 V bias, atmospheric conditions. From this, it can be seen that when the concentration of the n-type inorganic material is 20 wt% or more with respect to the total weight of the nanowire, the nanowire exhibits bipolarity.

Hereinafter, the present invention will be described in detail with reference to examples. However, these embodiments are for illustrative purposes only and are not intended to limit the present invention.

Example

1. Preparation of materials

Zinc oxide nanopowder (content of ZnO of 97% or more, diameter <50 nm) was purchased from Sigma Aldrich Korea and used as poly (3,4-ethylenedioxythiophene): poly (PEDOT: PSS, PH 1000, about 1.3% by weight) was purchased from Clevios Co., Germany. Water was purified water using a water purification system (Human RO 180, manufactured by Human Inc.).

2. Blend  Preparation of solution

To 3 g of the solvent, ZnO nano powder is mixed and the mixed aqueous solution is ultrasonicated for 2 hours to prepare a solution containing the n-type inorganic material in order to disperse the powder well in the solvent. An aqueous solution containing an n-type inorganic substance having different concentrations and an aqueous solution containing a p-type high molecular substance containing PEDOT: PSS in an amount of 1.3 wt% were mixed. The mixture was stirred at room temperature for 2 hours for uniform mixing. Prior to the growth of ZnO NPs-PEDOT: PSS hybrid nanowires, the blend solution was filtered through a 0.4 탆 PTFE membrane filter to remove coagulated particles. Mixed amounts are shown in Table 1 below.

Single nanowire A solution containing an n-type inorganic substance A solution containing a p-type polymer material containing PEDOT: PSS in an amount of 1.3% by weight ZnO nano powder water 0 wt% * ZnO NPs-PEDOT: PSS 0 mg 3g 1.5 g 10 wt% * ZnO NPs-PEDOT: PSS 2.2 mg 3g 1.5 g 20 wt% * ZnO NPs-PEDOT: PSS 4.9 mg 3g 1.5 g 22 wt% * ZnO NPs-PEDOT: PSS 5.5 mg 3g 1.5 g 25 wt% * ZnO NPs-PEDOT: PSS 6.5 mg 3g 1.5 g 30 wt% * ZnO NPs-PEDOT: PSS 8.4 mg 3g 1.5 g 40 wt% * ZnO NPs-PEDOT: PSS 13.0 mg 3g 1.5 g 50 wt% * ZnO NPs-PEDOT: PSS 19.5 mg 3g 1.5 g

* : The weight% represents the weight percentage of ZnO contained in a single nanowire composed of ZnO NPs-PEDOT: PSS.

3. hybrid  Nano Of wire  growth

The glass micropipette (about 0.6 urn radius r 0 ) was made with a P-97 (sutter instrument). The substrate used was an Au patterned electrode with a 50 μm gap in a 1000 nm thick thermal oxide layer. For electrical stability, the hybrid nanowires were integrated on the electrode and then annealed at 60 [deg.] C for 2 hours.

4. hybrid  Nano Of wire  Qualitative analysis

The microscopic characteristics of the hybrid nanowires were measured by a field emission scanning electron microscope (FE-SEM, Philips XL30SFEG) equipped with an optical microscope (OM, Nikon Eclipse LV150), an energy dispersive X-ray spectroscope (EDS, (TEM, JEOL JEM-2100F). The current-voltage (IV) characteristics of the hybrid nanowires on the Au electrodes were recorded with Keithley's 2612A. 100W Xenon light source (ASAHI SPECTRA LAX-CUTE) is an optical filter (ultraviolet mirror module, Asahi Spectra for ultraviolet and visible light, Asahi Spectra for visible light) to generate ultraviolet and visible light The intensity of the ultraviolet light was 0.19 mW / cm 2, and the intensity of the visible light was 2.87 mW / cm 2, which was measured with a spectroscope (CAS 140CT).

5. Results

(1) a single hybrid nanowire that depends on the concentration of the n-type inorganic material

Figure 4 shows various variations of the relative current density [Delta] j of single nanowires periodically exposed to ultraviolet (or visible) light. (a) shows PEDOT: PSS single nanowire, (b) 20 wt% ZnO NPs-PEDOT: PSS single nanowire, and (c) 30 wt% ZnO NPs-PEDOT: PSS single nanowire, Under atmospheric conditions.

According to this, the photoreactivity of the single hybrid nanowire depends on the concentration of ZnO NPs. A single hybrid nanowire (r ~ 250 nm, 1 ~ 75 탆) having various ZnO NPs concentrations (0-50 wt%) was prepared on a pre-designed Au electrode (insert view of Fig. Next, the photoconductivity was measured using the two-probe method under ultraviolet (? = 300-400 nm; 0.19 mW / cm 2 ) or visible light (? = 400-700 nm; 2.87 mW / cm 2 ) illumination. All single hybrid nanowires exhibited ohmic behavior. Fig. 4 shows a graphical representation of three (3) samples of PEDOT: PSS, (b) 20 wt% ZnO NPs-PEDOT: PSS, and (c) 30 wt% ZnO NPs-PEDOT: PSS periodically exposed to ultraviolet (or visible) Represents the change of current density? J of a representative single nanowire. Here, Δj is defined as follows.

? J? (J ill- j 0 ) / j 0

The current density when no light is irradiated is represented by j 0 , and the current density when irradiated is represented by j ill . For each nanowire, approximately the same photoreactivity is observed reproducibly. 4 (a) PEDOT: PSS nanowire (0 wt% ZnO NPs) exhibits positive photoreactivity (Δj> 0) at all times under ultraviolet and visible light irradiation. Positive photoreactivity under visible light irradiation is similarly observed in all of the hybrid nanowires produced, as well as the hybrid nanowires of FIGS. 4 (b) and 4 (c). However, the Δj of the hybrid nanowires decreases with the concentration of ZnO NPs under ultraviolet irradiation. Specifically, Δj drops to almost zero with respect to 20 wt% ZnO NPs (FIG. 4 (b)), and a negative value (Δj <0; negative photoreactivity Here, the change in signal due to the light wavelength of Fig. 4 (c) in the hybrid nanowire at high concentration (> 20 wt%) clearly shows the photoreactivity of the bipolarity of the hybrid nanowire.

(2) PEDOT: Photoreactivity of hybrid nanowires induced by PSS carrier (p-type semiconductor)

The photoreactivity of the hybrid nanowire is derived from the carrier (p-type semiconductor) of PEDOT: PSS, that is, the hole. Under visible light irradiation, the electrons of the valence band of PEDOT: PSS with a band gap energy of 1.6 eV can be excited to the conduction band and the hole carrier increases. This explains the positive photoreactivity of the hybrid nanowires under visible light irradiation regardless of the ZnO concentration (FIG. 4). On the other hand, excitation of ZnO NP by ultraviolet irradiation produces excited holes and electrons. The excited electrons can then be injected into the valence band of PEDOT: PSS, which reduces the carrier number of the PEDOT: PSS and further reduces the current density j of the hybrid nanowire (Figure 4)

To better understand the charge transfer, ultraviolet-visible light absorption and FT-IR studies were performed on ZnO NPs-PEDOT: PSS nanowires exhibiting photoreactivity similar to single hybrid nanowires. 5 (a) shows the ultraviolet-visible light absorption spectrum of the hybrid film due to the influence of ZnO NPs concentration. The absorption of λ~360 nm (ultraviolet regime) is expected from the broad bandgap of ZnO (3.37 eV). Shows an FT-IR spectrum of a hybrid film (50 wt% ZnO NPs concentration) under ultraviolet irradiation and under darkness. Reduced absorbance at 1290, 1177, 1070, 966 and 829 cm -1 of PEDOT under ultraviolet irradiation for 5 minutes (blue line) and reduced absorbance at 1004, 1047 and 1132 cm -1 of PSS were proposed in previous studies As shown in the figure, the oxidation of PEDOT: PSS shows similar results as the oxidation of PEDOT: PSS.

Each nanowire converts each value to an 8-bit red (left) (or 8-bit blue (right)) color based on the relative current density? J generated by visible light (or ultraviolet) Pixels. At this time, the Δj measurement was performed under a 1 V bias, atmospheric condition.

To demonstrate the versatility of the technique, individual growth of a single hybrid (30 wt% ZnO NPs PEDOT: PSS) nanowire with bipolar photoreactivity was performed at a planned location as outlined in Figure 6 (a) (Fig. 4 (c)). FIG. 6 (b) shows an optical microscope image of a heart-shaped single hybrid nanowire integrated on an Au-patterned electrode. For each nanowire in Fig. 6 (b), the relative current density? J is measured under visible light (or ultraviolet) irradiation, and as described for each nanowire like the pixel in Fig. 6 (c) Bit red (or 8-bit blue) at a maximum value (or minimum value) of 255, from 0 to 255 (see Table 2).

number j (%) 8-bit color Visible ray UV-rays Visible ray UV-rays One 2.75 -17.62 (243,0,0) (0,0,199) 2 2.57 -19.29 (228, 0, 0) (0,0,218) 3 2.59 -16.41 (229,0,0) (0,0,185) 4 2.48 -20.02 (220,0,0) (0, 0, 226) 5 2.76 -19.16 (244,0,0) (0,0,217) 6 2.69 -18.00 (238,0,0) (0,0,203) 7 2.75 -16.24 (243,0,0) (0,0,184) 8 2.75 -20.98 (243,0,0) (0,0,237) 9 2.54 -22.56 (225,0,0) (0,0,255) 10 2.49 -17.43 (220,0,0) (0,0,197) 11 2.44 -19.91 (216,0,0) (0,0,225) 12 2.54 -21.59 (225,0,0) (0,0,244) 13 2.60 -18.55 (230,0,0) (0, 0, 210) 14 2.42 -16.13 (214,0,0) (0,0,182) 15 2.51 -18.71 (222, 0, 0) (0, 0, 211) 16 2.79 -22.51 (247,0,0) (0,0,254) 17 2.72 -22.60 (241, 0, 0) (0,0,255) 18 2.76 -18.70 (244,0,0) (0, 0, 211) 19 2.46 -17.08 (218, 0, 0) (0,0,193) 20 2.70 -20.34 (239,0,0) (0, 0, 230) 21 2.67 -16.37 (236,0,0) (0,0,185) 22 2.69 -18.71 (238,0,0) (0, 0, 211) 23 2.52 -16.84 (223, 0, 0) (0,0,190) 24 2.88 -20.27 (255,0,0) (0,0,229) 25 2.62 -22.53 (232,0,0) (0,0,255) 26 2.26 -17.21 (200, 0, 0) (0,0,195) 27 2.58 -16.16 (228, 0, 0) (0,0,183) 28 2.56 -17.44 (227,0,0) (0,0,197)

The visible light and the ultraviolet light can be discriminated on the basis of the bipolar photoreactivity of the nanowire, as shown by red (left) and blue (right) in FIG. 6 (c) under visible light and ultraviolet light, respectively. In particular, the Δj values of integrated nanowires showed very small differences (2.61 ± 014% (or -18.91 ± 2.14%) (mean ± SD) for visible light (or ultraviolet light)). A single hybrid nanowire with bipolar photoreactivity can serve as a bridgehead between ultraviolet and visible light based on the ability to identify the spectrum.

6. Conclusion

In summary, the present invention uses a meniscus induction method to develop a single ZnO NPs-PEDOT: PSS hybrid nanowire with bipolar photoreactivity according to the wavelength of light. The photoreactivity of bipolarity appears in single hybrid nanowires at high concentrations (> 20 wt%) ZnO NPs. We have shown a nanowire photodetector array that can identify ultraviolet and visible light by individually integrating a single hybrid (30 wt% ZnO NPs-PEDOT: PSS) nanowire at the desired location. Specifically, the Δj values of the integrated nanowires represent a very small difference (Δj: 2.61 ± 0.14% (or -18.91 ± 2.14%) (mean ± SD), visible light (or ultraviolet light) And shows uniformity.

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Claims (9)

1. A method for producing a single nanowire having bipolar photoreactivity,
Preparing a blend solution by mixing a solution containing a p-type polymer material having a bandgap in a visible light region and a solution containing an n-type inorganic material having a band gap in an ultraviolet region; And
Preparing a single nanowire from the blend solution using a meniscus induction method,
Wherein the single nanowire comprises 20 wt% to 50 wt% n-type inorganic material based on the total weight of the nanowire. The method according to claim 1,
Wherein the p-type polymeric material is selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy), poly- (MEH-PPV), a method for producing a single nanowire having bipolar photoreactivity, which is one kind selected from the group consisting of methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) . The method according to claim 1,
Wherein the n-type inorganic material is one selected from the group consisting of ZnO, ZnS, and TiO 2 . The method according to claim 1,
The step of preparing a single nanowire with the blend solution using the meniscus induction method comprises:
Filling the glass microtubule with the blend solution;
Contacting the glass microtubule with a substrate to form a meniscus;
Forming a columnar structure by vertically pulling the glass microtubes to induce solidification of the solution exposed to the air; And removing the glass microtubule to form a nanowire. &Lt; Desc / Clms Page number 17 &gt; The method according to claim 1,
The solution containing the p-type polymer material is a mixture of a solvent and a p-type high molecular material, and comprises a single nanowire having a photoreactivity of bipolarity and containing 1 wt% to 5 wt% of a p- Lt; / RTI &gt; delete A single nanowire having bipolar photoreactivity comprising an n-type inorganic material to a p-type high molecular weight material in a weight ratio of 2: 8 to 5: 5. 8. The method of claim 7,
Wherein the n-type inorganic material is one selected from the group consisting of ZnO, ZnS, and TiO 2 . 8. The method of claim 7,
Wherein the p-type polymeric material is selected from the group consisting of poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), polypyrrole (PPy), poly- -Methoxy-5- (2-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV).
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