Sulfur dioxide gas-sensitive materials based on zeolitic imidazolate framework-derived carbon nanotubes

2018 ◽  
Vol 6 (25) ◽  
pp. 12115-12124 ◽  
Author(s):  
Qun Li ◽  
Jiabin Wu ◽  
Liang Huang ◽  
Junfeng Gao ◽  
Haowen Zhou ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Sulfur Dioxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Zeolitic Imidazolate Framework ◽  
Sensing Material

An active and stable gas-sensing material for SO2 at room temperature is presented. The particles synthesized using zinc-doped ZIFs as the precursor exhibit a porous polyhedral morphology with abundant interconnecting carbon nanotubes on the surface and improved conductivity.

scholarly journals Effect of Functionalized Carbon Nanotubes in the Detection of Benzene at Room Temperature

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Nurjahirah Janudin ◽  
Norli Abdullah ◽  
Wan Md Zin Wan Yunus ◽  
Faizah Md Yasin ◽  
Mohd Hanif Yaacob ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Room Temperature ◽  
Functional Group ◽  
Group Performance ◽  
Active Area ◽  
Functionalized Carbon Nanotubes ◽  
Sensing Material

In this paper, carbon nanotubes (CNTs) were functionalized by acid treatment and further functionalized with dodecylamine and were designated as CNT-carboxylic and CNT-amide, respectively. Then, functionalized CNTs produced were characterized with various methods to verify the attachment of a functional group. Performance of the functionalized CNTs in the detection of benzene gas was monitored at room temperature. The sample was dropped cast on the interdigitated transducer (IDT), and the changes in resistivity were recorded by a digital multimeter in a customized chamber under controlled humidity (∼55%) environment. Based on the findings, it showed that the functionalized CNTs provide an extra active area for interaction between the gas analyte and CNTs, thus increasing their response and improving the sensitivity of the sensing material.

Synthesis of NiO@CuO nanocomposite as high-performance gas sensing material for NO 2 at room temperature

2017 ◽  
Vol 412 ◽  
pp. 230-237 ◽  
Author(s):  
He Xu ◽  
Jiawei Zhang ◽  
Afrasiab Ur Rehman ◽  
Lihong Gong ◽  
Kan Kan ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sensing Material

scholarly journals Gas sensing with gold-decorated vertically aligned carbon nanotubes

2014 ◽  
Vol 5 ◽  
pp. 910-918 ◽  
Author(s):  
Prasantha R Mudimela ◽  
Mattia Scardamaglia ◽  
Oriol González-León ◽  
Nicolas Reckinger ◽  
Rony Snyders ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Nitrogen Dioxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Carbon Nanotube Forests

Vertically aligned carbon nanotubes of different lengths (150, 300, 500 µm) synthesized by thermal chemical vapor deposition and decorated with gold nanoparticles were investigated as gas sensitive materials for detecting nitrogen dioxide (NO2) at room temperature. Gold nanoparticles of about 6 nm in diameter were sputtered on the top surface of the carbon nanotube forests to enhance the sensitivity to the pollutant gas. We showed that the sensing response to nitrogen dioxide depends on the nanotube length. The optimum was found to be 300 µm for getting the higher response. When the background humidity level was changed from dry to 50% relative humidity, an increase in the response to NO2 was observed for all the sensors, regardless of the nanotube length.

Fabrication of Polyaniline-Coated Carbon Nanotubes Conducting Wire Nanocomposite for NH3 Gas Sensors at Room Temperature

2012 ◽  
Vol 554-556 ◽  
pp. 661-666
Author(s):  
Kan Kan ◽  
Chun Sheng Chen ◽  
Guang Xin Zhang ◽  
Chao Jiang ◽  
Li Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Gas Sensing ◽  
Oxidative Polymerization ◽  
Composite Films ◽  
Ammonium Persulfate ◽  
Coating Method ◽  
Conducting Wire ◽  
Coated Carbon ◽  
Higher Sensitivity

The nanocomposite of polyaniline (PAni)-coated Carbon nanotubes (CNT) for NH3gas sensing application are presented in this paper. The nanorods of PAni/CNT nanocomposite was synthesized by chemical oxidative polymerization of aniline using ammonium persulfate in acidic medium. The aniline was adsorbed in CNT by vacuum absorption method. The morphologies and properties of the nanocomposite have been characterized by SEM, XRD and FTIR respectively. Thin sensor of PAni/CNT nanorods was prepared by spin coating method. Finally, the response of these composite films for NH3gas was evaluated by monitoring the change in electrical resistance at room temperature. With compared to the pure PAni and CNT, tSubscript texthe nanorods of PAni/CNT composite films show a higher sensitivity.

scholarly journals Berlin Green Framework-Based Gas Sensor for Room-Temperature and High-Selectivity Detection of Ammonia

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tingqiang Yang ◽  
Lingfeng Gao ◽  
Wenxuan Wang ◽  
Jianlong Kang ◽  
Guanghui Zhao ◽  
...  
Keyword(s):  
High Resistance ◽  
Active Sites ◽  
Density Functional ◽  
Room Temperature ◽  
High Selectivity ◽  
Gas Sensing ◽  
Response Recovery ◽  
Sensing Material ◽  
Agriculture Industry ◽  
Ammonia Detection

AbstractAmmonia detection possesses great potential in atmosphere environmental protection, agriculture, industry, and rapid medical diagnosis. However, it still remains a great challenge to balance the sensitivity, selectivity, working temperature, and response/recovery speed. In this work, Berlin green (BG) framework is demonstrated as a highly promising sensing material for ammonia detection by both density functional theory simulation and experimental gas sensing investigation. Vacancy in BG framework offers abundant active sites for ammonia absorption, and the absorbed ammonia transfers sufficient electron to BG, arousing remarkable enhancement of resistance. Pristine BG framework shows remarkable response to ammonia at 50–110 °C with the highest response at 80 °C, which is jointly influenced by ammonia's absorption onto BG surface and insertion into BG lattice. The sensing performance of BG can hardly be achieved at room temperature due to its high resistance. Introduction of conductive Ti3CN MXene overcomes the high resistance of pure BG framework, and the simply prepared BG/Ti3CN mixture shows high selectivity to ammonia at room temperature with satisfying response/recovery speed.

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