# US 2014/0194658 A1 · New Class Of Tunable Gas Storage And Sensor Materials

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- Number: US 2014/0194658 A1
- Document ID: US20140194658A1
- Status: Published application
- Kind: A1
- Application number: 14/203,395
- Filed: 2014-03-10
- Published: 2014-07-10
- Earliest claimed: 2009-05-11
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Avetik R. Harutyunyan
- Web page: https://patentgrep.com/patent/US20140194658A1

## CPC

- B01J 20/205: {Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs (carbon nanotubes per se C01B32/15)}
- B01D 53/04: with stationary adsorbents {(B01D53/025 takes precedence)}
- B01D 53/32: by electrical effects other than those provided for in group B01D61/00
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/3085: {Chemical treatments not covered by groups B01J20/3007 - B01J20/3078}
- B01J 20/324: {containing free carbon, e.g. activated carbon}
- B01J 20/3295: {Coatings made of particles, nanoparticles, fibers, nanofibers}
- B01J 20/3441: {Regeneration or reactivation by electric current, ultrasound or irradiation, e.g. electromagnetic radiation such as X-rays, UV, light, microwaves}
- B01J 21/04: Alumina
- B01J 23/745: Iron
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/10: in the presence of water, e.g. steam
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01B 3/0021: Elemental carbon, e.g. active carbon, carbon nanotubes or fullerenes
- C01B 3/0026: Metals or metal hydrides
- C01B 3/0031: Intermetallic compounds; Metal alloys
- C01B 3/0042: only containing magnesium and nickel
- C01B 3/0078: Composite solid storage media, e.g. mixtures of polymers and metal hydrides, coated solid compounds or structurally heterogeneous solid compounds
- C01B 13/02: Preparation of oxygen (by liquefying F25J)
- C01B 21/24: Nitric oxide (NO) {(C01B21/203 takes precedence)}
- C01B 32/162: characterised by catalysts
- C01B 32/40: Carbon monoxide
- C01B 32/50: Carbon dioxide
- C01C 1/006: {making use of solid ammonia storage materials, e.g. complex ammine salts}
- C07C 7/12: by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
- G01N 27/125: {Composition of the body, e.g. the composition of its sensitive layer}
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 2253/102: Carbon
- B01D 2253/25: Coated, impregnated or composite adsorbents
- B01D 2253/304: Linear dimensions, e.g. particle shape, diameter
- B01D 2253/34: Specific shapes
- B01D 2257/102: Nitrogen
- B01D 2257/104: Oxygen
- B01D 2257/108: Hydrogen
- B01D 2257/404: Nitrogen oxides other than dinitrogen oxide
- B01D 2257/502: Carbon monoxide
- B01D 2257/504: Carbon dioxide
- B01D 2257/7025: Methane
- B82Y 15/00: Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 2202/02: Single-walled nanotubes
- C01B 2202/22: Electronic properties
- Y02C 20/20: of methane
- Y02C 20/40: of CO2
- Y02E 60/32: Hydrogen storage
- Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. CO2
- Y02P 20/156: Methane [CH4]
- Y10S 977/75: Single-walled
- Y10S 977/843: Gas phase catalytic growth, i.e. chemical vapor deposition
- Y10S 977/932: for electronic or optoelectronic application
- Y10S 977/957: Of chemical property or presence
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01C: AMMONIA; CYANOGEN; COMPOUNDS THEREOF ({metal hydrides, monoborane, diborane or addition complexes thereof C01B6/00}; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; azides C01B21/08; {compounds other than ammonia or cyanogen, containing nitrogen, non-metals and optionally metals C01B21/082}; metal imides or amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; compounds containing silicon C01B33/00; compounds containing boron C01B35/00)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The electronic structure of nanowires, nanotubes and thin films deposited on a substrate is varied by doping with electrons or holes. The electronic structure can then be tuned by varying the support material or by applying a gate voltage. The electronic structure can be controlled to absorb a gas, store a gas, or release a gas, such as hydrogen, oxygen, ammonia, carbon dioxide, and the like.

## Claims

### Claim 1

A method for storing a gas comprising:
providing a device comprising:
a support deposited on a gate wherein the support is in electrical communication with the gate;
a carbon-containing material deposited on the support, wherein the support is in electrical communication with the carbon-containing material and wherein the carbon-containing material is separated from the gate by the support; and
a power supply comprising the gate in electrical communication with the support and the carbon-containing material, wherein the power supply is capable of producing a voltage across the device and wherein the carbon-containing material is configured to adsorb gas responsive to the applied voltage; and
storing a gas by applying a voltage to the device.

### Claim 2 (depends on 1)

The method of claim 1 wherein the support comprises SiO2.

### Claim 3 (depends on 1)

The method of claim 1 wherein the support comprises Si and SiO2.

### Claim 4 (depends on 1)

The method of claim 1 wherein the carbon-containing material is selected from the group consisting of carbon nanotubes and nanowires.

### Claim 5 (depends on 4)

The method of claim 4 wherein the carbon-containing material is carbon nanotubes.

### Claim 6 (depends on 5)

The method of claim 5 wherein the carbon nanotubes are single-walled carbon nanotubes (SWNTs).

### Claim 7 (depends on 6)

The method of claim 6 wherein the SWNTs are semiconducting.

### Claim 8 (depends on 1)

The method of claim 1 wherein the carbon-containing material is about 2 μm in length.

### Claim 9 (depends on 1)

The method of claim 1 wherein the gas is hydrogen, oxygen, carbon dioxide, carbon monoxide, methane, ammonia or NO.

### Claim 10 (depends on 1)

The method of claim 1 wherein the gas is hydrogen.

### Claim 11 (depends on 1)

The method of claim 1 wherein the gas is NO.

### Claim 12 (depends on 1)

The method of claim 1 further comprising releasing the gas by decreasing the voltage.

### Claim 13 (depends on 12)

The method of claim 12 wherein decreasing the voltage comprises decreasing the voltage about 5% to about 50%.

### Claim 14 (depends on 1)

The method of claim 1 wherein the power supply is configured to produce a voltage of between −50 V and +50 V across the device.

### Claim 15 (depends on 1)

The method of claim 1 wherein the power supply is capable of producing a voltage of between −20 V and +20 V across the device.

### Claim 16 (depends on 1)

The method of claim 1 wherein the power supply is capable of producing a voltage of between −15 V and +15 V across the device.

### Claim 17 (depends on 1)

The method of claim 1 wherein the power supply is capable of producing a voltage of between −10 V and +10 V across the device.

### Claim 18 (depends on 1)

The method of claim 1 wherein the carbon-containing material is doped with a metal.

### Claim 19 (depends on 1)

The method of claim 1 wherein the metal is lithium, sodium, or potassium.

### Claim 20 (depends on 1)

The method of claim 1 wherein the support comprises a lower part and an upper part and the power supply comprises a negative pole and a positive pole and wherein the negative pole of the power supply comprises the gate and the positive pole of the power supply is connected to the upper part of the support.