Journal article
Hybrid tin oxide-SWNT nanostructures based gas sensor
Electrochimica acta, Vol.92, pp.484-490
03/01/2013
DOI: 10.1016/j.electacta.2013.01.029
Abstract
A facile electrochemical functionalization method was utilized to decorate single-walled carbon nanotubes (SWNTs) with tin oxide and their gas sensing performance toward various analytes (NH3, NO2, H2, H2S, acetone, and water vapor) was evaluated at room temperature. Tin oxy-hydroxide was site-specifically precipitated on the surface of SWNTs because of an increase in local pH during electrochemical reduction of nitrate to nitrite ions. By adjusting the amount of charge passed during deposition, the amount of tin oxide deposited on SWNTs was controlled, which altered the electronic and gas sensing properties of the nanostructures. The resulting hybrid nanostructures showed excellent sensitivities upon exposure to trace amounts of both oxidizing gases (limit of detection (LOD) of 25 ppbV for NO2) and reducing gases (LOD of 10ppmV for H2) at room temperature. The enhanced sensing performance was due to the charge transfer between the surface active tin oxide nanoparticles and SWNTs, with the direction of charge transfer depending on the analyte gas. This approach can be applied to fabricate other hybrid metal oxide-SWNTs nanostructures to create highly sensitive gas sensor arrays.
Details
- Title: Subtitle
- Hybrid tin oxide-SWNT nanostructures based gas sensor
- Creators
- Syed Mubeen - Department of Chemical and Environmental Engineering, University of California – Riverside, Riverside, CA 92521, United StatesMin Lai - School of Mathematics and Physics, Nanjing University of Information Science & Technology, Nanjing 210044, People's Republic of ChinaTing Zhang - Suzhou Institute of Nano-tech and Nano-bionics (SINANO), Chinese Academy of Science (CAS), Suzhou 215125, People's Republic of ChinaJae-Hong Lim - Department of Chemical and Environmental Engineering, University of California – Riverside, Riverside, CA 92521, United StatesAshok Mulchandani - Department of Chemical and Environmental Engineering, University of California – Riverside, Riverside, CA 92521, United StatesMarc A Deshusses - Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708, United StatesNosang V Myung - Department of Chemical and Environmental Engineering, University of California – Riverside, Riverside, CA 92521, United States
- Resource Type
- Journal article
- Publication Details
- Electrochimica acta, Vol.92, pp.484-490
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.electacta.2013.01.029
- ISSN
- 0013-4686
- eISSN
- 1873-3859
- Grant note
- name: Defense Microelectronic Activity (DMEA), award: H94003-05-2-0505; name: NIH Gene Environment Initiative, award: U01 ES 016026
- Language
- English
- Date published
- 03/01/2013
- Academic Unit
- Chemical and Biochemical Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984003939402771
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