# US 2014/0151219 A1 · Silver electrode coated with carbon nanotubes

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- Number: US 2014/0151219 A1
- Document ID: US20140151219A1
- Status: Published application
- Kind: A1
- Application number: 13/705,100
- Filed: 2012-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: King Fahd University of Petroleum and Minerals
- Applicants: King Fahd University of Petroleum and Minerals
- Inventors: ABDALLA M. ABULKIBASH; MOATAZ ALI ATEIEH; ABDULAZIZ NABIL AMRO
- Web page: https://patentgrep.com/patent/US20140151219A1

## CPC

- G01N 27/30: Electrodes, e.g. test electrodes; Half-cells (G01N27/414 takes precedence)
- G01N 27/308: {at least partially made of carbon}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- 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)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

The silver electrode coated with carbon nanotubes is an indicator electrode for microtitrimetry by differential electrolytic potentiometry. The electrode is made by first positioning at least one silver wire electrode within a reaction zone of a floating catalyst chemical vapor deposition reactor. A ferrocene catalyst is evaporated within the floating catalyst chemical vapor deposition reactor, and an inlet gas is fed therein to carry the evaporated ferrocene catalyst into the reaction zone. The inlet gas includes hydrogen and a carbon source, such as acetylene. The reaction zone is then heated for deposition of carbon onto the at least one silver electrode to form at least one silver electrode coated with carbon nanotubes. The electrode is cooled and then removed from the reactor.

## Claims

### Claim 1

A method of making silver electrodes coated with carbon nanotubes, comprising the steps of:
positioning at least one silver electrode within a reaction zone of a floating catalyst chemical vapor deposition reactor;
evaporating a ferrocene catalyst within the floating catalyst chemical vapor deposition reactor;
feeding an inlet gas into the floating catalyst chemical vapor deposition reactor to carry the evaporated ferrocene catalyst into the reaction zone, the inlet gas including a source of carbon;
heating the reaction zone for deposition of carbon from the inlet gas onto the at least one silver electrode to form at least one silver electrode coated with carbon nanotubes;
cooling the at least one silver electrode coated with carbon nanotubes; and
removing the at least one silver electrode coated with carbon nanotubes from the reaction zone of the floating catalyst chemical vapor deposition reactor.

### Claim 2 (depends on 1)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 1, wherein the step of evaporating the ferrocene catalyst comprises supporting the ferrocene catalyst in a catalyst boat and placing the catalyst boat and the ferrocene catalyst within a first reaction chamber of the floating catalyst chemical vapor deposition reactor.

### Claim 3 (depends on 2)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 2, wherein the step of evaporating the ferrocene catalyst is performed within the first reaction chamber at a temperature of about 120° C.

### Claim 4 (depends on 3)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 3, wherein the inlet gas comprises hydrogen gas and acetylene.

### Claim 5 (depends on 4)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 4, wherein the step of heating the reaction zone comprises heating the reaction zone to a temperature between 600° C. and 750° C.

### Claim 6 (depends on 5)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 5, wherein the heating step is performed for about 15 minutes.

### Claim 7 (depends on 6)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 6, wherein the hydrogen inlet gas is introduced into the reaction zone at a flow rate of about 25 ml/min during the heating step.

### Claim 8 (depends on 7)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 7, wherein the acetylene inlet gas is introduced into the reaction zone at a flow rate of about 75 ml/min during the heating step.

### Claim 9 (depends on 8)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 8, further comprising the step of flushing the floating catalyst chemical vapor deposition reactor with an inert gas prior to reaction.

### Claim 10 (depends on 9)

The method of making silver electrodes coated with carbon nanotubes as recited in claim 9, wherein the inert gas is argon.

### Claim 11

An indicator electrode for microtitrimetry by differential electrolytic potentiometry, comprising a silver electrode coated with carbon nanotubes.

### Claim 12 (depends on 11)

The indicator electrode as recited in claim 11, wherein each said carbon nanotube has a diameter between 10 nm and 30 nm.