Novel chemoresistive CH4 sensor with 10 ppm sensitivity based on multiwalled carbon nanotubes functionalized with SnO2 nanocrystals
Abstract
Chemoresistive sensors based on multiwalled carbon nanotubes (MWCNTs) functionalized with SnO2 nanocrystals (NCs) have great potential for detecting trace gases at low concentrations (single ppm levels) at room temperature, because the SnO2 nanocrystals act as active sites for the chemisorption of gas molecules, and carbon nanotubes (CNTs) act as an excellent current carrying platform, allowing the adsorption of gas on SnO2 to modulate the resistance of the CNTs. However, uniform conjugation of SnO2 NCs with MWCNTs is challenging. An effective atomic layer deposition based approach to functionalize the surface of MWCNTs with SnO2NCs, resulting in a novel CH4 sensor with 10 ppm sensitivity, is presented in this paper. Here, scanning electron microscopy, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy, and Raman spectroscopy were implemented to study the morphology, elemental composition, and the crystal quality of SnO2 functionalized MWCNTs. High resolution TEM images showed that the crystal quality of the functionalizing SnO2 NCs was of high quality with clear lattice fringes and the dimension almost three times smaller than shown thus far in literature. A lift-off based photolithography technique comprising bilayer photoresists was optimized to fabricate SnO2 functionalized MWCNTs-based chemoresistor sensor, which at room temperature can reliably sense below 10ppmmore »
- Authors:
-
- Univ. of Illinois, Chicago, IL (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- U.S. Environmental Protection Agency, Las Vegas, NV (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1532173
- Alternate Identifier(s):
- OSTI ID: 1421140
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Vacuum Science and Technology A
- Additional Journal Information:
- Journal Volume: 34; Journal Issue: 1; Journal ID: ISSN 0734-2101
- Publisher:
- American Vacuum Society / AIP
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Humayun, Md Tanim, Divan, Ralu, Liu, Yuzi, Gundel, Lara, Solomon, Paul A., and Paprotny, Igor. Novel chemoresistive CH4 sensor with 10 ppm sensitivity based on multiwalled carbon nanotubes functionalized with SnO2 nanocrystals. United States: N. p., 2015.
Web. doi:10.1116/1.4936384.
Humayun, Md Tanim, Divan, Ralu, Liu, Yuzi, Gundel, Lara, Solomon, Paul A., & Paprotny, Igor. Novel chemoresistive CH4 sensor with 10 ppm sensitivity based on multiwalled carbon nanotubes functionalized with SnO2 nanocrystals. United States. https://doi.org/10.1116/1.4936384
Humayun, Md Tanim, Divan, Ralu, Liu, Yuzi, Gundel, Lara, Solomon, Paul A., and Paprotny, Igor. Mon .
"Novel chemoresistive CH4 sensor with 10 ppm sensitivity based on multiwalled carbon nanotubes functionalized with SnO2 nanocrystals". United States. https://doi.org/10.1116/1.4936384. https://www.osti.gov/servlets/purl/1532173.
@article{osti_1532173,
title = {Novel chemoresistive CH4 sensor with 10 ppm sensitivity based on multiwalled carbon nanotubes functionalized with SnO2 nanocrystals},
author = {Humayun, Md Tanim and Divan, Ralu and Liu, Yuzi and Gundel, Lara and Solomon, Paul A. and Paprotny, Igor},
abstractNote = {Chemoresistive sensors based on multiwalled carbon nanotubes (MWCNTs) functionalized with SnO2 nanocrystals (NCs) have great potential for detecting trace gases at low concentrations (single ppm levels) at room temperature, because the SnO2 nanocrystals act as active sites for the chemisorption of gas molecules, and carbon nanotubes (CNTs) act as an excellent current carrying platform, allowing the adsorption of gas on SnO2 to modulate the resistance of the CNTs. However, uniform conjugation of SnO2 NCs with MWCNTs is challenging. An effective atomic layer deposition based approach to functionalize the surface of MWCNTs with SnO2NCs, resulting in a novel CH4 sensor with 10 ppm sensitivity, is presented in this paper. Here, scanning electron microscopy, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy, and Raman spectroscopy were implemented to study the morphology, elemental composition, and the crystal quality of SnO2 functionalized MWCNTs. High resolution TEM images showed that the crystal quality of the functionalizing SnO2 NCs was of high quality with clear lattice fringes and the dimension almost three times smaller than shown thus far in literature. A lift-off based photolithography technique comprising bilayer photoresists was optimized to fabricate SnO2 functionalized MWCNTs-based chemoresistor sensor, which at room temperature can reliably sense below 10ppm of CH4 in air. Such low level gas sensitivity, with significant reversible relative resistance change, is believed to be the direct result of the successful functionalization of the MWCNT surface by SnO2NCs.},
doi = {10.1116/1.4936384},
journal = {Journal of Vacuum Science and Technology A},
number = 1,
volume = 34,
place = {United States},
year = {Mon Nov 30 00:00:00 EST 2015},
month = {Mon Nov 30 00:00:00 EST 2015}
}
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