Carbon Nanotube Based Microwave Resonator Gas Sensors

2006 ◽  
Vol 16 (04) ◽  
pp. 913-935 ◽  
Author(s):  
M. P. McGRATH ◽  
A. PHAM
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Resonant Frequency ◽  
Gas Sensors ◽  
Gas Detection ◽  
Wireless Sensing ◽  
Microwave Resonator ◽  
Network Applications ◽  
Sensor Platform ◽  
Carbon Nanotube Resonator

This paper reviews our work on the development of microwave carbon nanotube resonator sensors for gas detection. The sensor consists of a radio frequency resonator coated with a layer of carbon nanotubes. Upon exposure to gasses, the resonant frequency of the sensor shifts to indicate the presence of gasses. Our experimental results demonstrate that the microwave carbon nanotube resonator sensor achieves a sensitivity of 4000 Hz/ppm upon exposure to ammonia and the resonant frequency is recovered when ammonia is evacuated. The sensing mechanism is dependent on electron transfer from the ammonia to the nanotubes. This sensor platform has great potential for wireless sensing network applications.

H2 Gas Sensor Based on Pd-Loaded Carbon Nanotube Film

2020 ◽  
Vol 20 (7) ◽  
pp. 4470-4473
Author(s):  
Maeum Han ◽  
Jae Keon Kim ◽  
Junyeop Lee ◽  
Hee Kyung An ◽  
Jong Pil Yun ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensors ◽  
Room Temperature ◽  
Pd Nanoparticles ◽  
Gas Detection ◽  
Structural Flexibility ◽  
Bending Tests ◽  
Multi Walled Carbon Nanotube ◽  
Reliable Detection ◽  
Detection Characteristics

Palladium-coated multi-walled carbon nanotube (Pd-MWCNT) nanocomposites have been experimentally proven to show highly improved hydrogen (H2) gas detection characteristics at room temperature when compared with single MWCNTs. In this context, we develop an efficient and convenient method for forming nanocomposites by coating Pd nanoparticles on an MWCNT film. Furthermore, we test the applicability of the nanocomposites as sensing materials in detecting H2 gas at room temperature in a reliable and sensitive manner in contrast with ordinary metal-oxidebased gas sensors that operate at high temperatures. We first study the detection efficacy of the Pd-MWCNT film relative to pure MWCNT film. Subsequently, we investigate the Pd-MWCNT sensor’s sensitivity over time for different gas concentrations, the sensor response time, and sensor reproducibility and reliability under various conditions including bending tests. Our sensor exhibits stable reliable detection characteristics and excellent structural flexibility.

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

2013 ◽  
Vol 699 ◽  
pp. 915-920
Author(s):  
Hideaki Watanabe ◽  
Hiroki Komure ◽  
Michihiko Nakano ◽  
Junya Suehiro
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Carbon Nanotube ◽  
Gas Sensor ◽  
Column Chromatography ◽  
Gas Sensors ◽  
Single Walled Carbon Nanotubes ◽  
Sensor Response ◽  
Spin Column ◽  
Walled Carbon Nanotubes

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.

Dynamic Analysis of a Clamped Wavy Single Walled Carbon Nanotube Based Nanomechanical Sensors

2010 ◽  
Vol 1 (3) ◽  
Author(s):  
Anand Y. Joshi ◽  
Satish C. Sharma ◽  
S. P. Harsha
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Resonant Frequency ◽  
Dynamic Analysis ◽  
Tube Length ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Resonance Frequencies ◽  
Surface Deviation ◽  
Vibration Signature

This paper deals with the dynamic analysis of carbon nanotube with surface deviation along its axis. The type of carbon nanotube used in this analysis is a single-walled carbon nanotube that is doubly clamped at a source and a drain and this type of nanotube is used to represent a single mode resonator. In previous studies, experimentally measured resonance frequencies of carbon nanotubes have been used along with classical beam theory for straight beams. However, it is found that these carbon nanotubes are not straight, and that they have some significant surface deviation associated with them. The resonant frequency of the doubly clamped single walled carbon nanotube (SWCNT) with deviation (waviness) has been investigated. The results showed the sensitivity of the single-walled carbon nanotubes having different waviness to different masses (attached at the center of a doubly clamped SWCNT) and different lengths. The sensitivity of resonant frequency shifts to tube length and waviness has been demonstrated. The vibration signature exhibits superharmonic and subharmonic responses with different levels of mass. The vibration spectra of CNT with varying attached mass from 10−5 fg to 10−3 fg show dense signature near peak of excitation. It is found that with the increase in mass attached to CNT with 60 nm length, the peak excitation appears in the vibration signature in chaotic nature with reduced vibration amplitude.

scholarly journals Single Wall Carbon Nanotube Gas Sensors

2021 ◽  
pp. 74-84
Author(s):  
V. M. Aroutiounian
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Physical Properties ◽  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Gas Sensors ◽  
Electronic Devices ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon

Excellent physical properties of carbon nanotubes (CNTs) are used for manufacturing of many electronic devices. Single wall version of CNTs is promising for detection many important gases including gases exhaled by the organism. The most promising is the realization of gas sensors based on metal oxides doped with CNTs. Application of CNT-based sensors to breathe analysis, properties of the SWCNTs gas sensors with metal nanoparticles and metal oxides and CNTs biosensors are reviewed in this paper.

An analytical model and ANN simulation for carbon nanotube based ammonium gas sensors

RSC Advances ◽  
2014 ◽  
Vol 4 (69) ◽  
pp. 36896-36904 ◽  
Author(s):  
Elnaz Akbari ◽  
Zolkafle Buntat ◽  
Aria Enzevaee ◽  
Seyed Javad Mirazimiabarghouei ◽  
Mahdi Bahadoran ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Analytical Model ◽  
Gas Sensors ◽  
Research Projects ◽  
Nano Technology ◽  
Engineering Research ◽  
Mechanical And Electrical Properties

As one of the most interesting advancements in the field of nano technology, carbon nanotubes (CNTs) have been given special attention because of their remarkable mechanical and electrical properties and are being used in many scientific and engineering research projects.

Development of carbon nanotube-based gas sensors for NOx gas detection working at low temperature

2008 ◽  
Vol 40 (7) ◽  
pp. 2272-2277 ◽  
Author(s):  
T. Ueda ◽  
M.M.H. Bhuiyan ◽  
H. Norimatsu ◽  
S. Katsuki ◽  
T. Ikegami ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Temperature ◽  
Gas Sensors ◽  
Gas Detection

Effect of functionalized multi-wall carbon nanotubes/Biresin CR82 epoxy nanocomposite on vibration attenuation of aluminum plate

2020 ◽  
pp. 107754632095051
Author(s):  
Alaa Alawy ◽  
Mohamed Abdlghany ◽  
Tamer Zakaria Wafy ◽  
Ahmed Hassan
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Resonant Frequency ◽  
Frequency Response ◽  
Response Function ◽  
Frequency Response Function ◽  
Cantilever Plate ◽  
Multi Wall Carbon Nanotubes ◽  
Epoxy Nanocomposite ◽  
Bending Modes

This article focused on further investigation of passive vibration damping of a cantilever plate using carbon nanotube/epoxy nanocomposite. A damping ratio depends on many factors, for example carbon nanotube content, type of carbon nanotubes, and frequency, so the epoxy composite reinforced with 0.2 wt. % multi-wall carbon nanotubes has been used with structural damping. Dynamic analysis for an aluminum cantilever plate has been studied to determine the effect of the epoxy nanocomposite material on the plate vibration. The main goal of the study was to minimize the frequency response function amplitude and shift the resonant frequency of the plate as high as possible, especially for the fundamental frequency. An finite element model exhibited an increase in the resonant frequency by 10.6% and 1.2% in addition to a reduction in the frequency response function amplitude by 79.5% and 43.26% at the first and second bending modes, respectively, when using 0.2 wt. % multi-wall carbon nanotubes/epoxy circular patches at an optimal position compared with the bare plate. In case of using a stiffener below the plate, the results exposed an increase in resonant frequency by 154.6% and 181.7%, whereas the frequency response function amplitude showed reduction by 95.9% and 98.2% at the first and second bending modes, respectively, when using three stiffeners of multi-wall carbon nanotubes/epoxy nanocomposite with the same mass of circular patches compared also with the bare plate.

scholarly journals Carbon nanotubes-based sensor for ammonia gas detection – an overview

Polimery ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 175-186
Author(s):  
M.N. Norizan ◽  
N.D. Siti Zulaikha ◽  
A.B. Norhana ◽  
M.I. Syakir ◽  
A. Norli
Keyword(s):  
Carbon Nanotubes ◽  
Human Health ◽  
Gas Sensors ◽  
Recent Progress ◽  
Conductive Polymers ◽  
Gas Detection ◽  
Ammonia Gas ◽  
Future Outlook ◽  
Detection Techniques ◽  
Industrial Sectors

A sensitive, selective and reliable sensing techniques for ammonia (NH3) gas detection have been highly demanded since NH3 is both a commonly utilized gas in various industrial sectors, and considered as a toxic and caustic agent that can threat human health and  environment at a certain level of concentrations. In this article, a brief on the fundamental working principles of sensor specifications of the analytes detection techniques relying has been reviewed. Furthermore, the mechanism of NH3 detection and recent progress in the development of advanced carbon nanotubes (CNTs)-based NH3 gas sensors, and their performance towards the hybridization with the conductive polymers wascomprehensively reviewed and summarized. Finally, the future outlook for the development of highperformanceNH3 sensors was presented in the conclusions part.

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