Solution-Based Fabrication of Carbon Nanotube Gas Sensor by Using Dielectrophoresis and Spin-Column Chromatography

Single-walled carbon nanotubes (SWCNTs) gas sensor has attracted a great deal of attention because of their remarkable properties. The sensor response is attribute to the semiconducting CNT whose electronic properties depend on its chirality. The authors have previously found that the sensor response increased by using separated semiconducting SWCNTs from a mixture with metallic one. Since the electronic structure (metallic or semiconducting) of CNTs is governed by their chirality, a chirality-selective fabrication of CNT gas sensor is essential to improve their performance. In this study, we proposed chirality-based separation of semiconducting SWCNTs by using spin-column chromatography. Pristine CNT suspension was separated into three fractions that had different chiralities of semiconducting SWCNTs. Separated semiconducting CNTs of each fraction were used for fabrication of three CNT gas sensors by dielectrophoresis. Comparison of these sensor responses to NO2 revealed that sensor response depended on the chirality.

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Single-Walled Carbon Nanotube Rope for Gas Sensor Application

MRS Proceedings ◽

10.1557/proc-788-l4.4 ◽

2003 ◽

Vol 788 ◽

Author(s):

J. W. Lee ◽

Y. M. Choi ◽

K. J. Kong ◽

H. J. Chang ◽

B. H. Ryu

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Gas Sensor ◽

Centrifugal Force ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon Nanotube ◽

Rapid Rotation ◽

Single Walled Carbon ◽

Improved Performance ◽

Walled Carbon Nanotubes

ABSTRACTA chemical gas sensor with a novel pad pattern applicable to NH3, NO2, and H2 gas was developed based on single-walled carbon nanotube ropes. In this pattern named BCE (Barricade confronting electrode), several electrodes were located at the circumference of a sample and each pair of electrode tips was designed to confront to each other with a narrow interval. Several single-walled carbon nanotubes were shifted to the interval by the centrifugal force generated through the rapid rotation of a sample equipped on the spinner. Our device showed improved performance for NO2, NH3, and H2 gases compared with others in references.

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First-order hyperpolarizabilities of chiral, polymer-wrapped single-walled carbon nanotubes

Chemical Communications ◽

10.1039/c6cc06190g ◽

2016 ◽

Vol 52 (82) ◽

pp. 12206-12209 ◽

Cited By ~ 4

Author(s):

Griet Depotter ◽

Jean-Hubert Olivier ◽

Mary G. Glesner ◽

Pravas Deria ◽

Yusong Bai ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electronic Structure ◽

Carbon Nanotube ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon ◽

First Order ◽

Walled Carbon Nanotubes ◽

Chiral Polymer

Manipulation of polymer electronic structure provides a new means to modulate the first-order hyperpolarizabilities (βHRS values) of chiral, individualized polymer-wrapped single-walled carbon nanotube superstructures at a telecommunication-relevant wavelength (1280 nm).

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Reversible changes in the electronic structure of carbon nanotube-hybrids upon NO2 exposure under ambient conditions

Journal of Materials Chemistry A ◽

10.1039/d0ta02749a ◽

2020 ◽

Vol 8 (19) ◽

pp. 9753-9759

Author(s):

Filippo Fedi ◽

Oleg Domanov ◽

Hidetsugu Shiozawa ◽

Kazuhiro Yanagi ◽

Paolo Lacovig ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electronic Structure ◽

Carbon Nanotube ◽

Ambient Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Single Walled Carbon Nanotubes ◽

Ambient Conditions ◽

Walled Carbon Nanotubes ◽

Very High

Single-walled carbon nanotubes have enormous potential for gas sensing. This study shows that cluster filling is a key to high sensitivity and it opens the possibility for a very high desorption at ambient temperature.

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Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.486-487.485 ◽

2005 ◽

Vol 486-487 ◽

pp. 485-488 ◽

Cited By ~ 1

Author(s):

Hong Quang Nguyen ◽

Mai Van Trinh ◽

Jeung Soo Huh

Keyword(s):

Carbon Nanotubes ◽

Gas Sensor ◽

Gas Adsorption ◽

Operating Temperature ◽

High Sensitivity ◽

Single Walled Carbon Nanotubes ◽

Fast Response ◽

Carrier Gas ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

The effect of operating temperature on characteristics of single-walled carbon nanotubes (SWNT) based gas sensor was investigated. SWNT-based sensor was fabricated from SWNT powder (Iljin Nanotech, Korea) by screen-printing method. SWNT powder (30 mg, AP grade) was dispersed into 0.78 gram a-terpineol (Aldrich) by ultrasonic vibration for 1 hour then stirred manually for 1 hour to increase adhesion. From this condensed solution, a thick film of SWNT was printed onto alumina substrates. The film then was sintered at 300oC for 2 hours to remove residual impurities. Upon exposure to some gases such as nitrogen, ammonia or nitric oxide, resistance of the sensor dramatically changes due to gas adsorption. In our experiments, SWNT-based sensor was employed to detect NH3 gas in N2 ambience. After saturated of N2, the sensor exposes to NH3 with various concentrations (from 5 ppm to 100 ppm, diluted by N2 as carrier gas). This sensor exhibits a fast response, high sensitivity but slow recovery at room temperature. By heating at high temperature and increasing the flow-rate of carrier gas, NH3 gas desorbs easily and recovery of the sensor improved. The heating also influenced the characteristics of sensors such as response and reproducibility. Other special changes in electric property of SWNT-based sensor caused by heating are also discussed.

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Effects of purification on the diameter separation of metallic single-walled carbon nanotubes by gel column chromatography

physica status solidi (RRL) - Rapid Research Letters ◽

10.1002/pssr.201206145 ◽

2012 ◽

Vol 6 (6) ◽

pp. 250-252

Author(s):

Jing Zhang ◽

Furui Tan ◽

Hongbo Li ◽

Hehua Jin ◽

Qingwen Li

Keyword(s):

Carbon Nanotubes ◽

Column Chromatography ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

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Lipase on carbon nanotube - An active, selective, stable and easy to optimize nanobiocatalyst for kinetic resolutions

Reaction Chemistry & Engineering ◽

10.1039/d1re00342a ◽

2021 ◽

Author(s):

Cristian Andrei Gal ◽

Laura Edit Barabas ◽

Judith Hajnal Bartha-Vari ◽

Madalina Elena Moisa ◽

Diana Balogh-Weiser ◽

...

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Covalent Binding ◽

Single Walled Carbon Nanotubes ◽

Candida Antarctica ◽

Flow Mode ◽

Lipase B ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes ◽

Kinetic Resolutions

An efficient nanobioconjugate of lipase B from Candida antarctica was prepared by the covalent binding on carboxy-functionalized single-walled carbon nanotubes and tested in batch and flow mode for the enzymatic...

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