CN106694902B - ZnO-CdS@Au nanocomposite and its application - Google Patents
ZnO-CdS@Au nanocomposite and its application Download PDFInfo
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Abstract
The invention belongs to nanometer new material technology fields, and in particular to a kind of ZnO-CdS@Au nanocomposite and its preparation method and application.The nanocomposite is using fusoid ZnO nano particle as substrate, and surface deposits CdS nano particle, finally coats Au nano particle.Its preparation method is by Zn (NO3)2·6H2O、NH4F, NaOH reacts, and obtains white precipitate ZnO nano particle；It again will be with Cd (NO3)2·4H2O, thiocarbamide forms suspension, deposits, and centrifugation obtains ZnO-CdS product, is eventually adding gold chloride, sodium citrate, flows back, cooling, and centrifugation obtains ZnO-CdS@Au nanocomposite.The photoelectric characteristic for improving nano material of nanocomposite of the invention, and can be used to rapidly and accurately detect tetracycline.
Description
Technical field
The invention belongs to nanometer new material technology fields, and in particular to a kind of ZnO-CdS@Au nanocomposite and its system
Preparation Method and application.
Background technique
ZnO is novel and multifunctional II-VI race, the wide bandgap semiconductor materials with high exciton bind energy, it have it is nontoxic,
The advantages that good biocompatibility, electro-chemical activity are high and electron transport ability is strong, in recent years in photoelectric device, surface acoustic wave and pressure
Electric material, feds, sensor, ultraviolet laser, solar cell etc., which have, to be widely applied.Studies have shown that
The characteristic of zinc oxide depends on its microstructure, including crystal size, form, specific surface area and crystal density, in addition to this, shape
The building of looks and surface texture is also a critically important aspect.
However, the photocatalytic activity of current ZnO material is lower, it is lower to the service efficiency of light.Therefore, exploitation one is needed
Kind photocatalytic activity height, the ZnO nano composite material high to the service efficiency of light.
Summary of the invention
The object of the present invention is to provide a kind of photocatalytic activity height, Au nanometers of ZnO-CdS@high to the service efficiency of light to answer
Condensation material, present invention simultaneously provides preparation methods and application.
ZnO-CdS@Au nanocomposite of the present invention is: using fusoid ZnO nano particle as substrate, table
Face deposits CdS nano particle, finally coats Au nano particle.
Wherein: ZnO nano particle length is 200~300nm, and CdS nano-particle diameter is 20~25nm, Au nano particle
Diameter is 5~10nm.
The preparation method of the ZnO-CdS@Au nanocomposite, includes the following steps:
(1) by Zn (NO3)2·6H2The deionized water solution and NH of O4The mixing of F deionized water solution, is added dropwise NaOH thereto
Deionized water solution, when beginning, form white precipitate, are added dropwise to that solution is translucent, with the revolving speed of 1800~2100r/min,
It is stirred at 90~110 DEG C muddiness 9.5~10.5 hours, cooling, centrifugation, acquisition white precipitate, deionized water, ethanol washing, 55
It is dry at~65 DEG C, obtain ZnO nano particle；
(2) by the ZnO nano even particulate dispersion of acquisition in dissolved with Cd (NO3)2·4H2The deionization of O and thiocarbamide is water-soluble
It in liquid, with the revolving speed of 1800~2100r/min, is heated 0.4~0.6 hour at 85~95 DEG C, cooling, centrifugation, deionized water
Washing, it is dry at 55~65 DEG C, obtain ZnO-CdS；
(3) ZnO-CdS is dispersed in deionized water, gold chloride deionized water solution is added, returns after mixing
Stream starts timing since 105~108 DEG C, sodium citrate deionized water solution is added after 15min, heat 30~50min, cools down, from
The heart, deionized water, ethanol washing, 75~85 DEG C drying 5~7 hours, obtain ZnO-CdS@Au nanocomposite.
It is preferred that following steps:
(1) by Zn (NO3)2·6H2The deionized water solution and NH of O4The mixing of F deionized water solution, is added dropwise NaOH thereto
Deionized water solution, when beginning, form white precipitate, are added dropwise to that solution is translucent, with the revolving speed of 2000r/min, at 100 DEG C
Stirring is 10 hours muddy, cooling, centrifugation, acquisition white precipitate, deionized water, ethanol washing, dry at 60 DEG C, obtains ZnO and receives
Rice grain；
(2) by the ZnO nano even particulate dispersion of acquisition in dissolved with Cd (NO3)2·4H2The deionization of O and thiocarbamide is water-soluble
It in liquid, with the revolving speed of 2000r/min, is heated 0.5 hour at 90 DEG C, cooling, centrifugation, deionized water washing is done at 60 DEG C
It is dry, obtain ZnO-CdS；
(3) ZnO-CdS is dispersed in deionized water, gold chloride deionized water solution is added, returns after mixing
Stream starts timing since 108 DEG C, sodium citrate deionized water solution is added after 15min, heats 40min, cooling, is centrifuged, deionization
Water, ethanol washing, 80 DEG C drying 6 hours, obtain ZnO-CdS@Au nanocomposite.
In step (1), Zn (NO3)2·6H2The molar concentration of O deionized water solution is 0.25mol/L, NH4F deionized water
The molar concentration of solution is 2.0mol/L, and the molar concentration of NaOH deionized water solution is 2.0mol/L.
In step (1), Zn (NO3)2·6H2O、NH4F, the molar ratio of NaOH is 1:4:4.
In step (2), Cd (NO3)2·4H2O is being dissolved with Cd (NO3)2·4H2In the deionized water solution of O and thiocarbamide
Molar concentration is 0.01mol/L, and thiocarbamide is being dissolved with Cd (NO3)2·4H2Molar concentration in the deionized water solution of O and thiocarbamide
For 0.01 mol/L.
In step (2), ZnO, Cd (NO3)2·4H2O, the molar ratio of thiocarbamide is 1:2:2.
In step (3), the concentration of gold chloride deionized water solution is 1wt%, the concentration of sodium citrate deionized water solution
For 0.04 mol/L.
In step (3), ZnO-CdS, gold chloride deionized water solution, sodium citrate deionized water solution usage ratio be
20 mg:0.54mL:1.5mL。
The present invention be used for detect tetracycline biosensor the preparation method is as follows:
Graphene oxide (GO) deionized water solution is added dropwise on the ITO electro-conductive glass cleaned up and obtains ITO electrode,
Before parching completely, ZnO-CdS Au deionized water solution is added dropwise, is dispersed in the ITO electrode surface pre-processed.
Aptamer and TET is connected on the surface ITO/GO/ZnO-CdS Au not parched completely.4 DEG C of moist environment preservations, are used for into one
The use of step.
Beneficial effects of the present invention are as follows:
The present invention deposits CdS nano particle and Au nano particle in ZnO nano particle surface, successfully synthesizes a kind of novel
ZnO-CdS@Au nanocomposite.The artificial photosynthetic systems of the complex material include ZnO and CdS two separation it is photochemical
System and Au nano particle electric transmission system.ZnO-CdS@Au nanocomposite applications of the present invention are sensed in optical electro-chemistry
Device promotes photoelectric characteristic.The sensor prepared by the present invention for being used to detect tetracycline, inspection good to the detection stability of tetracycline
It is low to survey limit, only 0.050 μM.
Detailed description of the invention
Fig. 1 is ZnO-CdS@Au sensor preparation process schematic diagram；
Fig. 2 is photocatalytic mechanism figure of the present invention；
Wherein: A, ZnO-CdS@Au nanocomposite；B, the electron transmission schematic diagram of CdS-Au；
Fig. 3 is ZnO scanning electron microscope (SEM) photograph prepared by embodiment 1；
Fig. 4 is ZnO-CdS scanning electron microscope (SEM) photograph prepared by embodiment 2；
Fig. 5 is ZnO-CdS@Au scanning electron microscope (SEM) photograph prepared by embodiment 3；
Fig. 6 is the ZnO of preparation, the X-ray diffraction spectrogram of ZnO-CdS, ZnO-CdS Au；
Fig. 7 is photocurrent response curve graph；
Wherein: a, ITO-GO；b,ITO-GO-ZnO；c,ITO-GO-ZnO-CdS@Au；
Fig. 8 is TET concentration changes with time photocurrent response curve graph；
Fig. 9 is that the sensor of embodiment preparation is used to detect the selective comparative diagram of tetracycline.
Specific embodiment
The present invention is described further with reference to embodiments.
Embodiment 1
1.4875g Zn (NO3)2·6H2O is dissolved in 20mL deionized water, 0.7408g NH4F is dissolved in 10mL deionization
Water is sufficiently stirred at room temperature, is uniformly dispersed, be placed in oil bath after the two mixing.It is added dropwise and is dissolved in 10mL deionized water
0.8002g NaOH.When a small amount of NaOH is added, white precipitate is formed immediately, continues to be partly dissolved after adding NaOH, solution becomes
It is translucent, and then become cloudy, with the revolving speed of 2000r/min, 100 DEG C are stirred 10 hours, it is cooled to room temperature, product centrifuge separation,
With alternately washing 4 times of deionized water and ethyl alcohol, white precipitate is obtained, 60 DEG C of fusoid ZnO nano particles for being dried to obtain crystallization.
Embodiment 2
Take 0.2364g Cd (NO3)2·4H2O and 0.0761g thiocarbamide is dissolved in the mixed liquor after 100mL deionized water as molten
Liquid A, 0.4mg ZnO nano even particulate dispersion prepared by the embodiment 1 rear stirring in 10mL solution A, with 2000r/min
Revolving speed be cooled to room temperature after heating 30min in 90 DEG C of oil bath, be centrifuged, and alternately wash 4 with deionized water and ethyl alcohol
It is secondary, obtain yellow mercury oxide ZnO-CdS, 60 DEG C of dry yellow powders become yellow from white and show that CdS nano particle successfully sinks
Product is in ZnO nano particle surface.
Embodiment 3
ZnO-CdS 20mg prepared by Example 2 is evenly dispersed into 25mL deionized water, is evenly stirred until that clarification is molten
Liquid, the gold chloride deionized water solution that 0.54mL, 1wt% is added are uniformly mixed, 110 DEG C of reflux, the timing since 108 DEG C,
The sodium citrate deionized water solution of 1.5mL 0.04M is added after 15min, heats 40min, is cooled to room temperature, is centrifuged, is used in combination
Deionized water and ethyl alcohol alternately washing 4 times, ZnO-CdS@Au nanocomposite can be obtained in 80 DEG C of dry 6h.
Comparative example 1
1.4875g Zn (NO3)2·6H2O is dissolved in 20mL deionized water, 0.7408g NH4F is dissolved in 10mL deionization
Water is sufficiently stirred at room temperature, is uniformly dispersed, be placed in oil bath after the two mixing.It is added dropwise and is dissolved in 10mL deionized water
0.8002g NaOH.When a small amount of NaOH is added, white precipitate is formed immediately, continues to be partly dissolved after adding NaOH, solution becomes
It is translucent, and then become cloudy, with the revolving speed of 2000r/min, 10min is stirred at room temperature, is cooled to room temperature, product centrifuge separation is used
Alternately washing 4 times of deionized water and ethyl alcohol, obtain white precipitate, 60 DEG C of fusoid ZnO nano particles for being dried to obtain crystallization.
Take 0.2364g Cd (NO3)2·4H2O and 0.0761g thiocarbamide is dissolved in the mixed liquor after 100mL deionized water as molten
Liquid A, the rear stirring in 10mL solution A by the 0.4mg ZnO nano even particulate dispersion of above-mentioned preparation, with turning for 2000r/min
Speed is cooled to room temperature after heating 30min in 90 DEG C of oil bath, is centrifuged, and is alternately washed 4 times with deionized water and ethyl alcohol, is obtained
To yellow mercury oxide ZnO-CdS, 60 DEG C of dry yellow powders become yellow from white and show that CdS nano particle successful deposition exists
ZnO nano particle surface.
Take the ZnO-CdS 20mg of above-mentioned preparation is evenly dispersed to be evenly stirred until clear solution into 25mL deionized water,
The gold chloride deionized water solution that 0.54mL, 1wt% is added is uniformly mixed, 110 DEG C of reflux, the timing since 108 DEG C, 15min
The sodium citrate deionized water solution of 1.5mL, 0.04M are added afterwards, heats 40min, is cooled to room temperature, is centrifuged, and use deionization
Water and ethyl alcohol alternately washing 4 times, ZnO-CdS@Au nanocomposite can be obtained in 80 DEG C of dry 6h.
Comparative example 2
1.4875g Zn (NO3)2·6H2O is dissolved in 20mL deionized water, 0.7408g NH4F is dissolved in 10mL deionization
Water is sufficiently stirred at room temperature, is uniformly dispersed, be placed in oil bath after the two mixing.It is added dropwise and is dissolved in 10mL deionized water
0.8002g NaOH.When a small amount of NaOH is added, white precipitate is formed immediately, continues to be partly dissolved after adding NaOH, solution becomes
It is translucent, and then become cloudy, with the revolving speed of 2000r/min, 50 DEG C of stirring 10h are cooled to room temperature, and product centrifuge separation is spent
Alternately washing 4 times of ionized water and ethyl alcohol, obtain white precipitate, 60 DEG C of fusoid ZnO nano particles for being dried to obtain crystallization.
Take 0.2364g Cd (NO3)2·4H2O and 0.0761g thiocarbamide is dissolved in the mixed liquor after 100mL deionized water as molten
Liquid A, the rear stirring in 10mL solution A by the 0.4mg ZnO nano even particulate dispersion of above-mentioned preparation, with turning for 2000r/min
Speed is cooled to room temperature after heating 30min in 90 DEG C of oil bath, is centrifuged, and is alternately washed 4 times with deionized water and ethyl alcohol, is obtained
To yellow mercury oxide ZnO-CdS, 60 DEG C of dry yellow powders become yellow from white and show that CdS nano particle successful deposition exists
ZnO nano particle surface.
Take the ZnO-CdS 20mg of above-mentioned preparation is evenly dispersed to be evenly stirred until clear solution into 25mL deionized water,
The gold chloride deionized water solution that 0.54mL, 1wt% is added is uniformly mixed, 110 DEG C of reflux, the timing since 108 DEG C, 15min
The sodium citrate deionized water solution of 1.5mL, 0.04M are added afterwards, heats 40min, is cooled to room temperature, is centrifuged, and use deionization
Water and ethyl alcohol alternately washing 4 times, ZnO-CdS@Au nanocomposite can be obtained in 80 DEG C of dry 6h.
Comparative example 3
1.4875g Zn (NO3)2·6H2O is dissolved in 20mL deionized water, 0.7408g NH4F is dissolved in 10mL deionization
Water is sufficiently stirred at room temperature, is uniformly dispersed, be placed in oil bath after the two mixing.It is added dropwise and is dissolved in 10mL deionized water
0.8002g NaOH.When a small amount of NaOH is added, white precipitate is formed immediately, continues to be partly dissolved after adding NaOH, solution becomes
It is translucent, and then become cloudy, with the revolving speed of 2000r/min, 100 DEG C of stirring 10h are cooled to room temperature, and product centrifuge separation is spent
Alternately washing 4 times of ionized water and ethyl alcohol, obtain white precipitate, 60 DEG C of fusoid ZnO nano particles for being dried to obtain crystallization.
Take 0.2364g Cd (NO3)2·4H2O and 0.0761g thiocarbamide is dissolved in the mixed liquor after 100mL deionized water as molten
Liquid A is carried out low by the 0.4mg ZnO nano even particulate dispersion of above-mentioned preparation in 10mL solution A with the revolving speed of 600r/min
Speed stirring, 90 DEG C of heating 30min are cooled to room temperature, and are centrifuged, and are alternately washed 4 times with deionized water and ethyl alcohol, and it is heavy to obtain yellow
Shallow lake ZnO-CdS, 60 DEG C of dry yellow powders, becomes yellow from white and shows CdS nano particle successful deposition in ZnO nano
Grain surface.
Take the ZnO-CdS 20mg of above-mentioned preparation is evenly dispersed to be evenly stirred until clear solution into 25mL deionized water,
The gold chloride deionized water solution that 0.54mL, 1wt% is added is uniformly mixed, 110 DEG C of reflux, the timing since 108 DEG C, 15min
The sodium citrate deionized water solution of 1.5mL, 0.04M are added afterwards, heats 40min, is cooled to room temperature, is centrifuged, and use deionization
Water and ethyl alcohol alternately washing 4 times, ZnO-CdS@Au nanocomposite can be obtained in 80 DEG C of dry 6h.
The present invention is by the way that on CdS nano particle and Au nanoparticle deposition to the polar surfaces of ZnO nano particle, design is closed
At the ZnO-CdS@Au nanocomposite with photocatalysis performance to the detection to tetracycline.The photocatalysis of composite material
Mechanism is as shown in Figure 2.CdS nano particle and Au nano particle pass through absorption and deposit to the surface ZnO, the Au nano particle energy of modification
Enough enhance light absorption, promotes the separation and transfer of photo-generated carrier by local type surface plasma body resonant vibration (LSPR) effect.
ZnO-CdS@Au combination electrode can significantly improve efficiency of light.
Fig. 3 to Fig. 5 is ZnO, ZnO-CdS, the scanning electron microscope (SEM) photograph of ZnO-CdS@Au respectively.In Fig. 3, ZnO nano particle is
It is a kind of fusoid, there is the rod-like nano particle of very bigger serface, length is in 200nm or so.Such as Fig. 4, when the surface ZnO is heavy
After having accumulated cadmium sulfide nanoparticles, fusoid ZnO surface texture is blurred, and partial size remains unchanged, and all CdS
Nano particle is all fixed on the surface ZnO.The partial size of the cadmium sulfide nanoparticles of deposition is in 20nm or so.In Fig. 5, work as ZnO-CdS
Surface deposition has gone up Au nano particle, and wherein the partial size of Au is about 8nm, is dispersed in the surface ZnO-CdS.
Fig. 6 be spindle-shaped ZnO, ZnO-CdS and ZnO-CdS@Au nano particle XRD test result, with the peak in figure into
Row comparison, indicates that main diffraction maximum and the normal data of the wurtzite structure of ZnO (JCPDS 36-1451) match, passes through XRD
Additional peak is not detected, this shows the fabulous purity in ZnO product.By comparing the XRD diagram of ZnO-CdS, Ke Yiming
Find out aobviously, other than the diffraction maximum of ZnO, 2 θ=26.79 ° of the angle of diffraction, 44.08 ° and 51.75 ° correspond respectively to cubic
CdS (JCPDS 65-3414), shows CdS nanoparticle successful deposition on the surface ZnO.Again with the XRD diagram of ZnO-CdS@Au into
Row comparison is that there are also faint diffraction maximums at 38.16 °, 44.51 ° and 64.54 ° in 2 θ of the angle of diffraction, these peaks belong to Au (JCPDS
65-2870), thus map it can be concluded that sample by tri- kinds of material compositions of ZnO, CdS and Au.
Embodiment 4
The electro-conductive glass ITO of fixed-area is taken out, before modification, successively uses acetone, ethyl alcohol/NaOH mixed solution (body
Product is than being cleaned by ultrasonic each 15min for 1:1), and conduction is horizontal upwardly, then is cleaned by ultrasonic 15min with deionized water, respectively at 60 DEG C
Dry 1h.The area of fixed ITO electrode is 1*1cm2, make conductive face-up, horizontal positioned, the oxygen of 30 μ L (1mg/mL) of dropwise addition
The ZnO-CdS Au deionized water solution (1mg/ of 30 μ L is added dropwise before parching completely in graphite alkene (GO) deionized water solution
ML), it is dispersed in and has pre-processed in ITO electrode surface.
The Aptamer of 10 μ L is added in the electrode surface of above-mentioned preparation, uses PBS buffer solution (0.01 after 60 DEG C of dry 1h
M, pH value=7.4) 4 DEG C of culture 5h, deionized water is rinsed, and removes non-reacted molecules.
The ITO-GO-ZnO-CdS@Au-Aptamer prepared is placed in 60 in the PBS buffer solution containing various concentration TET
DEG C dry 2h, is rinsed with PBS, electrode is placed in 0.1M ascorbic acid solution under the irradiation of 300W xenon lamp and carries out photo-signal
Measurement.
Photocurrent response is the effective ways for monitoring ZnO-CdS@Au electrode assembling, as shown in Figure 7.Curve a, b can in figure
To find out, the electrode photoelectric intensity of flow of ITO-GO and ITO-GO-ZnO are all smaller, because ZnO can only absorb ultraviolet light, lead to light
The transfer efficiency of electric current is low；Since electronics transfer can be enhanced in Au nanoparticle, the electric current of ITO-GO-ZnO-CdS@Au electrode is strong
Degree increases (curve c)；After ZnO-CdS Au is deposited on the electrode, photo-current intensity is significantly improved, this is because ITO-GO electrode
ZnO-CdS@Au is set more to be deposited on electrode surface with big specific surface area, the provable ZnO-CdS@Au's of photocurrent response
Synthesis is successful.
As shown in figure 8, preferable correlation is presented between TET concentration, equation of linear regression A=0.0046C+0.9853
(R2=0.9945), in S/N=3, Monitoring lower-cut is 0.050 μM.
For new sensing system, need to have good selectivity target analytes when analyzing actual sample.For
The specificity that verifying newly-designed Photoelectrochemistrbiosensor biosensor amplifies tetracycline signal, we using kanamycins, gram
It draws mycin, aureomycin, Ciprofloxacin and chloramphenicol as chaff interferent, under the same conditions, tests the sensor to tetracycline
Selectivity.As seen from Figure 9, compared with other several chaff interferents, tetracycline has best selectivity.This shows the life
The selectivity of analyte detection is good, has high special, can be used for the detection of actual sample.
Claims (9)
1. a kind of ZnO-CdS@Au nanocomposite, which is characterized in that using fusoid ZnO nano particle as substrate, table
Face deposits CdS nano particle, finally coats Au nano particle；
The preparation method of the ZnO-CdS@Au nanocomposite, comprising the following steps:
(1) by Zn (NO3)2·6H2The deionized water solution and NH of O4F deionized water solution mixing, thereto be added dropwise NaOH go from
Sub- aqueous solution, when beginning, form white precipitate, are added dropwise to that solution is translucent, with the revolving speed of 1800~2100 r/min, 90~
It is stirred at 110 DEG C muddiness 9.5~10.5 hours, cooling, centrifugation, acquisition white precipitate, deionized water, ethanol washing, 55~65
It is dry at DEG C, obtain ZnO nano particle；
(2) by the ZnO nano even particulate dispersion of acquisition in dissolved with Cd (NO3)2·4H2The deionized water solution of O and thiocarbamide
In, cooling after being heated 0.4~0.6 hour at 85~95 DEG C with the revolving speed of 1800~2100 r/min, centrifugation, deionization
Water washing, it is dry at 55~65 DEG C, obtain ZnO-CdS；
(3) ZnO-CdS is dispersed in deionized water, gold chloride deionized water solution is added, flows back after mixing, from
Sodium citrate deionized water solution is added after 15 min for 105~108 DEG C of beginning timing, heats 30~50 min, cooling, centrifugation,
Deionized water, ethanol washing, 75~85 DEG C drying 5~7 hours, obtain ZnO-CdS@Au nanocomposite.
2. ZnO-CdS@Au nanocomposite according to claim 1, which is characterized in that ZnO nano particle length is
200~300 nm, CdS nano-particle diameter are 20~25 nm, and Au nano-particle diameter is 5~10 nm.
3. ZnO-CdS@Au nanocomposite according to claim 1, which is characterized in that in step (1), Zn
(NO3)2·6H2The molar concentration of O deionized water solution is 0.25 mol/L, NH4The molar concentration of F deionized water solution is 2.0
The molar concentration of mol/L, NaOH deionized water solution is 2.0 mol/L.
4. ZnO-CdS@Au nanocomposite according to claim 1 or 3, which is characterized in that in step (1), Zn
(NO3)2·6H2O、NH4F, the molar ratio of NaOH is 1:4:4.
5. ZnO-CdS@Au nanocomposite according to claim 1, which is characterized in that in step (2), Cd
(NO3)2·4H2O is being dissolved with Cd (NO3)2·4H2Molar concentration in the deionized water solution of O and thiocarbamide is 0.01 mol/L,
Thiocarbamide is being dissolved with Cd (NO3)2·4H2Molar concentration in the deionized water solution of O and thiocarbamide is 0.01 mol/L.
6. ZnO-CdS@Au nanocomposite according to claim 1 or 5, which is characterized in that in step (2), ZnO,
Cd(NO3)2·4H2O, the molar ratio of thiocarbamide is 1:2:2.
7. ZnO-CdS@Au nanocomposite according to claim 1, which is characterized in that in step (3), gold chloride is gone
The concentration of deionized water solution is 1wt%, and the concentration of sodium citrate deionized water solution is 0.04 mol/L.
8. ZnO-CdS@Au nanocomposite according to claim 7, which is characterized in that in step (3), ZnO-CdS,
Gold chloride deionized water solution, sodium citrate deionized water solution usage ratio be 20 mg: 0.54 mL:1.5 mL.
9. a kind of application of ZnO-CdS@Au nanocomposite of any of claims 1 or 2, which is characterized in that preparation is used for
Detect the sensor of tetracycline.
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| CN201611257038.2A CN106694902B (en) | 2016-12-30 | 2016-12-30 | ZnO-CdS@Au nanocomposite and its application |
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