High-quality SWCNTs can also be obtained by the optimization of the catalysts. The poly(3-methylthiophene)/MWCNTs nanocomposite-based sensor was used to selectively discriminate between chloromethane and methane, as the sensor showed a high response to chloromethane, while no response was observed when exposed to methane or many other VOCs [43]. Young-Seok Shim, Do Hong Kim, Hu Young Jeong, Yeon Hoo Kim, Seung Hoon Nahm, Chong-Yun Kang, Jin-Sang Kim, Wooyoung Lee, Ho Won Jang. Toward breath analysis on a chip for disease diagnosis using semiconductor-based chemiresistors: recent progress and future perspectives. Z. Sadek, C. Zhang, Z. Hu, J. G. Partridge, D. G. McCulloch, W. Wlodarski and K. Kalantar-zadeh .

Meng Wu, Meng He, Qianku Hu, Qinghua Wu, Guang Sun, Lili Xie, Zhanying Zhang, Zhigang Zhu. Humidity sensing using polyaniline/polyvinyl alcohol nanocomposite blend. Amin Firouzi, Shafreeza Sobri, Faizah Mohd Yasin, Fakhru'l Razi Ahmadun.

Single-Walled Carbon Nanotube Polyelectrolyte Multilayers and Freestanding Films as a Biocompatible Platform for Neuroprosthetic Implants. When high dc voltage is applied between the carbon anode and cathode, plasma of the inert gas is generated to evaporate the carbon atoms. This effect is probably induced by the fact that the ordered SWCNTs are more uniformly exposed to the NH3 molecules, than the case of placement of SWCNTs in form of a random network, in which part of the SWCNT remains inaccessible to the gas molecules. Carbon nanotubes and its gas-sensing applications: A review.

Yu. [33] demonstrated NO gas sensing with carboxyl functionalized SWCNTs and MWCNTs. Nanoelectronic Heterodyne Sensor: A New Electronic Sensing Paradigm. MWCNTs were grown selectively on the substrate via catalytic activation with microwave PECVD. The resistance responses of all three materials to NO2 are shown in Figure 34. José J. Plata, Veronica Collico, Antonio M. Márquez, Javier Fdez Sanz. Fabrication of ultrathin, free-standing, transparent and conductive graphene/multiwalled carbon nanotube film with superior optoelectronic properties. A CuO–ZnO nanostructured p–n junction sensor for enhanced N-butanol detection. Figure 3. Nguyen Hong Quang, Mai Van Trinh, Bong-Ho Lee, Jeung-Soo Huh.

Seong‐Yong Jeong, Jun‐Sik Kim, Jong‐Heun Lee.

[21] demonstrated the partial discharge detection in SF6 gas using an MWCNTs-based gas sensor.

Therefore, the resistance response of CNTs to gas adsorption can be detected with field emit transistors (FETs) [46–50]. Probing Ca Influence of the contact geometry on single-walled carbon nanotube/Si photodetector response.

With less than twenty years history, the progress and application in CNTs-related technology has been developed impressively fast due to their unique inherent morphologies and properties. Jisoo Park, Yeonhoo Kim, Seo Yun Park, Sae Jin Sung, Ho Won Jang, Chong Rae Park. Alessandro Capo, Angela Pennacchio, Antonio Varriale, Sabato D'Auria, Maria Staiano, . Modification of carbon nanotubes with functional groups and metal nanoparticles or incorporation of carbon nanotubes with polymers and metal oxides will greatly enhance the selectivity of the carbon nanotubes-based sensors. First-principles study on the gas sensing property of the Ge, As, and Br doped PtSe

Three models have been proposed to explain it. M Penza, M Alvisi, R Rossi, E Serra, R Paolesse, A D’Amico, C Di Natale. -Functionalized Zinc Oxide Microstructures for Highly Selective Hydrogen Gas Sensing Applications. Haojun Ding, Yaoming Wei, Zixuan Wu, Kai Tao, Minghui Ding, Xi Xie.

Sanghun Kim, Hyeong Rag Lee, Yong Ju Yun, Seungmuk Ji, Kwonjae Yoo, Wan Soo Yun, Ja-Yong Koo, Dong Han Ha. However, they also indicate that many reported electronic properties measured on as-prepared nanotubes should be assigned to oxygen-doped CNTs instead of intrinsic CNTs [33, 38]. The Difference between Carbon Monoxide and Carbon Dioxide Detection, Application of Level Detection Devices for Tank Measurements of Powders and Solids, Customizing Liquid Flow Meters for Specific Applications, The Importance of Calibration for Torque Sensors and Load Cells, Developing the Future of Computer-Aided Engineering, The MX 16 Gas Sensor from Teledyne Gas and Fire Detection, iNode™: Sensors and Crowdsourced Traffic Data, Infrared Camera with Optical Resolution of 382 x 288 Pixels: thermoIMAGER TIM QVGA, Graphene Electrodes to Power Next-Gen Electrochemical Sensors, Biosensors, Ultra-Sensitive, Resilient Strain Sensor for Textiles and Soft Robots, New Sub-Kelvin Mini-Thermometer for Superconductor-Based Quantum Computers, Novel Sensor to Measure Weak Magnetic Signals in the Brain, Encoding-Decoding System Allows Faster Data Transfer of Fiber Optic Sensors, Sensor-Based Respirator Could Replace N95 Respirators, Titan Enterprises and Beer Flow Sensors - Supplying to the Beer Industry, Reliable Results with Self-Service Thermal Scanning, The Best Sensors to Monitor Emissions in Animal Husbandry. 2 developed an amperometric sensor based on polydiphenylamine (PDPA) grafted MWCNTs (MWNT-g-PDPA) for determination of CO. Cyclic voltammetry is used to fabricate the modified electrode and to demonstrate the electroactivity of MWNT-g-PDPA-ME toward gaseous CO. To date, there have been a variety of attempts to overcome this limitation. Synthesis of nanowire bundle-like WO3-W18O49 heterostructures for highly sensitive NH3 sensor application. A nanochannel through a plasmonic antenna gap: an integrated device for single particle counting. Mohammad T. Baei, Ali Reza Soltani, Parviz Torabi, Ali Varasteh Moradi.

Self-Activated Transparent All-Graphene Gas Sensor with Endurance to Humidity and Mechanical Bending. The vertically aligned MWNT film was prepared by CVD on SiO2 substrate with tip diameter in the range of  nm and 30 m in length (Figure 19 (c)). Accelerating Gas Adsorption on 3D Percolating Carbon Nanotubes. Harrig, T.A. The response time and recovery time are 9 minutes and 1.5 minute, respectively.

In the detection of toxic airborne particles, the binding of a toxic molecule at a level of parts per billion, the contact between the toxin molecule and the carbon nanotube will create a change in the shape of the nanotube structure and this will affect the level and speed of electrical conductance across the nanotube structure. O Using first-principle calculations, they demonstrated that these sensors can detect CO and water molecules, and more important, the response of these sensors can be controlled by adjusting the doping level of heteroatoms in a nanotube. Kuchibhatla, A.S. Karakoti, Debasis Bera, S. Seal.

Nikita Nekrasov, Stanislav Khartov, Ivan Bobrinetskii, Vladimir Nevolin, , . A non-contact strategy for controlled enrichment, manipulation, and separation of carbon nanotubes by surface acoustic waves.

M. Troudi, Y. Bergaoui, P. Bondavalli, N. Sghaier.

The extended detection capability to inorganic vapors is attributed to direct charge transfer with electron hopping effects on intertube conductivity through physically adsorbed POAS between CNTs. Jaehyun Chung, Kyong-Hoon Lee, Junghoon Lee.

gas detection. Detection of vapor released from sublimating materials encased in porous medium.

Lili Tang, Gang Yu, Yuejun Ouyang, Weiwei Si, Baicheng Weng. Shiyu Wei, Fengshou Tian, Feng Ge, Xiaohong Wang, Guobing Zhang, Hongbo Lu, Jun Yin, Zongquan Wu.

Au and Pt nanoclusters were sputtered on the surface of MWCNTs.