WO2006035524A1 - 微小電極製造方法及びその製造方法によって作製された微小電極 - Google Patents
微小電極製造方法及びその製造方法によって作製された微小電極 Download PDFInfo
- Publication number
- WO2006035524A1 WO2006035524A1 PCT/JP2005/005584 JP2005005584W WO2006035524A1 WO 2006035524 A1 WO2006035524 A1 WO 2006035524A1 JP 2005005584 W JP2005005584 W JP 2005005584W WO 2006035524 A1 WO2006035524 A1 WO 2006035524A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- microelectrode
- electrode
- manufacturing
- electrode material
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/60—Forming conductive regions or layers, e.g. electrodes
- H10K71/611—Forming conductive regions or layers, e.g. electrodes using printing deposition, e.g. ink jet printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
Definitions
- the present invention relates to a method for producing a nanoscale microelectrode and a microelectrode produced by the method.
- the surface of the molecular structure on the substrate can be controlled, for example, the orientation of the molecular structure having nanoscale (hereinafter referred to as “nanomolecular structure” or simply “molecular structure”) can be controlled.
- nanoscale hereinafter referred to as “nanomolecular structure” or simply “molecular structure”.
- an electrode having a gap width that is smaller than the size of the nanomolecular structure is a generic term. (Referred to as “microelectrodes”).
- a bottom contact type There are two methods for manufacturing a microelectrode, called a bottom contact type and a top contact type.
- the bottom contact type is a method in which an electrode structure is produced on a substrate and then the molecular structure is developed on the electrode.
- the top contour type is a method in which the molecular structure is developed on the substrate and then the electrode structure is produced. It is.
- the top contact type has higher electrical conductivity (see Non-Patent Document 1). Therefore, it is a very important issue whether the electrode is manufactured before the molecular structure or after that.
- the top contact type nanogap electrode which has the same gap size as a nanomolecular structure that has little influence on the formation of the nanomolecular structure, is very useful for molecular devices that utilize a structure in which the molecular structure is developed on a flat substrate surface Useful to it is conceivable that.
- a step is formed between the electrode and the substrate, so that the molecular structure placed on the electrode is deformed and the original function of the molecule is not exhibited (see Fig. 7).
- organic molecules often develop solution forces on the electrode, but if there is a step, the solution accumulates in that area, and after the solvent evaporates, molecular aggregates remain. This is from here.
- the molecules here When the molecules here are dispersed, they cannot be connected to the electrode, which is a major obstacle when forming a molecular scale device.
- the affinity between the electrode and the molecular self-organization structure may vary depending on the location, which may cause a problem that the self-organization structure on the electrode cannot be developed. Arise. Therefore, it is necessary to avoid molecular deformation and molecular aggregation at the electrode edge by placing a molecular structure on a flat substrate and forming an electrode on it as in the top contact type.
- the microfabrication technology that has been used in silicon semiconductors uses harsh reaction conditions such as resist, electron beam irradiation, and etching processes for electrode formation, so organic molecules cannot withstand these processes. ,.
- Non-Patent Document 2 describes a method for producing a top contact type electrode (gold electrode) by transfer.
- a pattern is formed on one substrate, and gold is deposited thereon by vapor deposition.
- SiO is formed on the other substrate, and SAM (self-assembled
- MPTMs (3-mer captopr opyltrimethoxysilane: Aldrich Chemical Co.) is formed as a monolayer. Then, gold is transferred to the other substrate using the bonding force of S (sulfur) and gold. In this case, if chemical treatment is performed on the other substrate in order to transfer gold as an electrode, care must be taken because molecules and chemical substances may react.
- Non-patent literature l Appl. Phys. Lett. 82 (2003) 793.
- Non-Patent Document 2 J. AM. CHEM. SOC. 2002, 124, 7654-7655
- An object of the present invention is to provide a method for producing a good microelectrode without affecting molecules and a microelectrode produced by the production method.
- an organic molecule is disposed on the first substrate, and the second substrate is disposed.
- a release material is applied onto the formed desired pattern, an electrode material is attached onto the release material, and the surface of the second substrate on which the electrode material is attached and the organic molecules on the first substrate are arranged.
- the electrode material is transferred onto the first substrate in close contact with the placed surface.
- FIG. 1A is a diagram showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- FIG. 1B is a diagram showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- FIG. 1C is a diagram showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- FIG. 1D is a diagram showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- FIG. 1E is a diagram showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- FIG. 2A is a diagram showing an example of an electrode having a line width of 500 nm manufactured by the procedure of FIG.
- FIG. 2B is a diagram showing an example of an electrode having a line width of 500 nm manufactured by the procedure of FIG. 1A to FIG. 1E.
- FIG. 3A is a diagram showing a pattern example of a microelectrode manufactured by the method of FIG.
- FIG. 3B is a diagram showing a pattern example of a microelectrode fabricated by the method of FIG.
- FIG. 4A is a diagram in which electrical characteristics between end portions of one electrode pattern are measured.
- FIG. 4B is a diagram in which electrical characteristics between the end portions of one electrode pattern are measured.
- Fig. 5A shows molecular structure (nanotubes) dispersed and immobilized (arranged) before electrode formation. It is a figure which shows the circuit structure for measuring the electrical resistance in a case.
- FIG. 5B is a diagram showing a result of measurement by the circuit of FIG. 5A.
- FIG. 6 is a diagram showing a connection form of a nanotube and an electrode.
- FIG. 7 is a diagram for explaining a problem in manufacturing a bottom contact type electrode.
- FIG. 8 is a view showing an optical microscope image of an electrode transferred onto an organic substance (polyaline) by the manufacturing method according to the present embodiment, (a) is a view showing an optical microscope image of the electrode, (B) is (a
- FIG. 9 is a view showing an optical microscopic image of an electrode transferred onto sapphire by the manufacturing method according to the present embodiment.
- FIGS. 1A to 1E are diagrams showing a flow of a microelectrode manufacturing method according to an embodiment of the present invention.
- a top contact type microelectrode is intended.
- the electrode is formed by transfer.
- a substrate 1 serving as an electrode transfer mold (hereinafter referred to as “first substrate”) and a substrate 4 to be transferred (hereinafter referred to as “second substrate”) are prepared.
- a pattern is formed on one surface of the first substrate 1 (mold fabrication: FIG. 1A).
- the pattern is formed on the Si substrate by electron beam lithography, for example.
- the molecular structure is preliminarily arranged on one surface of the second substrate 4.
- a molecular layer may be formed on one surface of the first substrate 1.
- the release material 2 is applied onto the formed pattern by spin coating so that the electrode material is easily transferred to the second substrate 4 (application of the release material: Fig. 1B). Adhere on release material 2 (electrode material adhesion: Fig. 1C).
- gold is most preferable as a material that best satisfies the above conditions, it is not limited to gold, and for example, platinum, copper, aluminum, and the like can be used. Further, by using gold as the electrode material 3, the fixing property of the electrode on the substrate can be increased by utilizing a self-organized film having a thiol group. Similar reactions are also directed at precious metals such as platinum and palladium, and copper, but at present, the reaction of gold and thiols is the reaction that links the organic molecular layer with the most well-studied reaction.
- a pattern was formed on 2 2 by electron beam lithography. Note that pattern formation is not limited to electron beam lithography, and other known semiconductor technologies (such as etching) may be used.
- Electrode material adhesion Gold was deposited on the 40 nm release material 2 as an electrode material 3 by vapor deposition.
- the electrode material 3 can be attached by sputtering or the like.
- the electrode material 3 is formed on the side wall of the recess (groove) of the pattern. It is preferable to adopt a method that does not adhere to 3. Therefore, it is preferable to employ an adhesion method by vapor deposition as a method for adhering the electrode material 3 to the first substrate 1.
- FIGS. 2A and 2B show an electrode having a line width of 500 nm manufactured by the above procedure.
- FIG. 2A is an electrode pattern image observed with an optical microscope
- FIG. 2B is an electrode pattern image observed with an AFM (atomic force microscope).
- AFM atomic force microscope
- FIGS. 3A and 3B show pattern examples of microelectrodes manufactured by the above method.
- FIG. 3A is an optical microscope image
- FIG. 3B is an AFM image. Electrical characteristics were measured using this electrode pattern.
- FIG. 4A and FIG. 4B are diagrams in which electrical characteristics between the end portions of one electrode pattern are measured.
- FIG. 4A is a measurement circuit diagram
- FIG. 4B is a graph showing the measurement results.
- the vertical axis represents the current value
- the horizontal axis represents the bias voltage.
- the electrical resistance of the electrode is about 1 kilohm, and the IV curve at that time shows good ohmic characteristics.
- the electrical resistance between adjacent electrodes was higher than the measurement limit.
- FIG. 5A and FIG. 5B show the results of measuring the electrical resistance when the molecular structure (nanotubes) is dispersed and fixed (arranged) before the electrodes are formed.
- FIG. 6 is a diagram showing a connection form of the nanotube and the electrode.
- FIG. 5A is a measurement circuit diagram
- FIG. 5B is a graph showing the measurement results.
- the vertical axis is the current value
- the horizontal axis is the bias voltage. From Fig. 5B, an energy gap was observed reflecting the electronic properties of the nanotubes.
- FIG. 8 is a view showing an optical microscope image of an electrode transferred onto an organic substance (polyaline) by the manufacturing method according to the present embodiment.
- (a) is a diagram showing an optical microscope image of the electrode
- (b) is an enlarged view of the vicinity of the center of (a).
- FIG. 9 is a diagram showing an optical microscope image of the electrode transferred onto sapphire by the manufacturing method according to the present embodiment.
- the microelectrode formed as described above has good ohmic characteristics, and can be sufficiently used as an electrode.
- an electrode that destroys the molecular structure can be formed.
- the microelectrode produced in this embodiment can realize a wiring with a very small contact resistance and low power loss. Therefore, a good top contact type microelectrode can be manufactured according to the present invention.
- the conventional problems as described above can be solved.
- Molecular electronics is being applied to computers that can be folded like paper, such as new computing systems that perform netfook-type information processing, such as the brain.
- the present invention relates to a fundamental technology that supports all of these molecular devices, and its application covers a wide range of devices using molecules, and the possibilities are extremely wide.
- the mold is disposable, and in the above embodiment, it is necessary to make the mold from 1 for each transfer. Therefore, it is preferable to prepare a template, transfer the mold to a general polymer material such as PDMS, mass-produce the mold, apply a release material on the mold, perform gold vapor deposition, and transfer the mold. As a result, many molds can be easily and inexpensively made from one template.
- a general polymer material such as PDMS
- a metal surface may be used.
- an electrode can be formed without affecting the molecular structure on the first substrate.
- tantalum oxide for example, tantalum oxide, sapphire, organic layer (thick film), lipid thin film, metal oxide, nitrogen oxide, silicon dioxide (SiO 2)
- GaAs gallium arsenide
- compound semiconductors can be used.
- the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.
- the problems described in the column of problems to be solved by the invention can be solved, and the effects of the invention can be described.
- a configuration in which this configuration requirement is deleted can be extracted as an invention.
- a microelectrode having excellent characteristics can be formed without deforming or destroying the molecular structure.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Electrodes Of Semiconductors (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006537632A JPWO2006035524A1 (ja) | 2004-09-28 | 2005-03-25 | 微小電極製造方法及びその製造方法によって作製された微小電極 |
| US11/692,350 US20070169881A1 (en) | 2004-09-28 | 2007-03-28 | Method for manufacturing microelectrode and microelectrode manufactured by the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004282564 | 2004-09-28 | ||
| JP2004-282564 | 2004-09-28 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/692,350 Continuation US20070169881A1 (en) | 2004-09-28 | 2007-03-28 | Method for manufacturing microelectrode and microelectrode manufactured by the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006035524A1 true WO2006035524A1 (ja) | 2006-04-06 |
Family
ID=36118676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/005584 Ceased WO2006035524A1 (ja) | 2004-09-28 | 2005-03-25 | 微小電極製造方法及びその製造方法によって作製された微小電極 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20070169881A1 (ja) |
| JP (1) | JPWO2006035524A1 (ja) |
| WO (1) | WO2006035524A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200807160A (en) * | 2006-07-20 | 2008-02-01 | Univ Nat Cheng Kung | Micro/nano-pattern film contact transfer process |
-
2005
- 2005-03-25 WO PCT/JP2005/005584 patent/WO2006035524A1/ja not_active Ceased
- 2005-03-25 JP JP2006537632A patent/JPWO2006035524A1/ja active Pending
-
2007
- 2007-03-28 US US11/692,350 patent/US20070169881A1/en not_active Abandoned
Non-Patent Citations (4)
| Title |
|---|
| KIM C. ET AL: "Nanolithography based on patterned metal transfer and its application to organic electronic devices.", APPLIED PHYSICS LETTERS., vol. 80, no. 21, 27 May 2002 (2002-05-27), pages 4051 - 4053, XP001126502 * |
| LOO Y.H. ET AL: "Interfacial Chemistries for Nanoscale Transfer Printing.", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY., vol. 124, no. 26, 3 July 2002 (2002-07-03), pages 7654 - 7655, XP002990027 * |
| RHEE J. AND LEE H.H. ET AL: "Patterning organic light-emitting diodes by cathode transfer.", APPLIED PHYSICS LETTERS., vol. 81, no. 22, 25 November 2002 (2002-11-25), pages 4165 - 4167, XP001159919 * |
| SCHMID H. ET AL: "Preparation of Metallic Films on Elastomeric Stamps and Their Application for Contac Processing and Contact Printing.", ADVANCED FUNCTIONAL MATERIALS., vol. 13, no. 2, February 2003 (2003-02-01), pages 145 - 153, XP001143605 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070169881A1 (en) | 2007-07-26 |
| JPWO2006035524A1 (ja) | 2008-05-15 |
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