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Title: Effects of ambient humidity and temperature on the NO 2 sensing characteristics of WS 2/graphene aerogel

Abstract

The effects of ambient humidity and temperature on the NO 2 sensing characteristics of WS 2/graphene aerogel (WS 2/GA) composite are investigated. In order to probe the gas sensing performances of WS 2/GA, the sensor is fabricated by integrating WS 2/GA with a microfabricated two-electrode device. The WS 2/GA is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nitrogen porosimetry. This hybrid nanomaterial is found to improve the selectivity to NO 2, compared to control graphene and WS 2 aerogels. The NO 2 sensing performance of the WS 2/GA-based sensors is investigated under different relative humidities (0–60%), and ambient temperatures (room temperature (RT) to 180 °C). In all instances, the sensors exhibit p-type behavior. In dry atmosphere, faster response and better recovery are obtained with increasing temperature, reaching optimum sensing performance around 180 °C. At room temperature, interestingly, humidity is found helpful for enhancing the response and recovery of the sensor to NO 2. Detection limits in the range of 10–15 ppb NO 2 were determined. A potential gas sensing mechanism for this composite aerogel is introduced.

Authors:
 [1];  [2];  [3];  [3];  [4];  [4]
  1. Univ. of California, Berkeley, CA (United States); Hangzhou Dianzi Univ., Hangzhou (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1548316
Alternate Identifier(s):
OSTI ID: 1548412
Report Number(s):
LLNL-JRNL-750568
Journal ID: ISSN 0169-4332; 936041
Grant/Contract Number:  
AC52-07NA27344; AC02-05CH11231; FA9550-14-1-0323
Resource Type:
Accepted Manuscript
Journal Name:
Applied Surface Science
Additional Journal Information:
Journal Volume: 450; Journal Issue: C; Journal ID: ISSN 0169-4332
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; WS2/graphene aerogel; Heterojunction; NO2 sensing; Humid air conditions

Citation Formats

Yan, Wenjun, Worsley, Marcus A., Pham, Thang, Zettl, Alex, Carraro, Carlo, and Maboudian, Roya. Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel. United States: N. p., 2018. Web. doi:10.1016/j.apsusc.2018.04.185.
Yan, Wenjun, Worsley, Marcus A., Pham, Thang, Zettl, Alex, Carraro, Carlo, & Maboudian, Roya. Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel. United States. doi:10.1016/j.apsusc.2018.04.185.
Yan, Wenjun, Worsley, Marcus A., Pham, Thang, Zettl, Alex, Carraro, Carlo, and Maboudian, Roya. Sun . "Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel". United States. doi:10.1016/j.apsusc.2018.04.185. https://www.osti.gov/servlets/purl/1548316.
@article{osti_1548316,
title = {Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel},
author = {Yan, Wenjun and Worsley, Marcus A. and Pham, Thang and Zettl, Alex and Carraro, Carlo and Maboudian, Roya},
abstractNote = {The effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel (WS2/GA) composite are investigated. In order to probe the gas sensing performances of WS2/GA, the sensor is fabricated by integrating WS2/GA with a microfabricated two-electrode device. The WS2/GA is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nitrogen porosimetry. This hybrid nanomaterial is found to improve the selectivity to NO2, compared to control graphene and WS2 aerogels. The NO2 sensing performance of the WS2/GA-based sensors is investigated under different relative humidities (0–60%), and ambient temperatures (room temperature (RT) to 180 °C). In all instances, the sensors exhibit p-type behavior. In dry atmosphere, faster response and better recovery are obtained with increasing temperature, reaching optimum sensing performance around 180 °C. At room temperature, interestingly, humidity is found helpful for enhancing the response and recovery of the sensor to NO2. Detection limits in the range of 10–15 ppb NO2 were determined. A potential gas sensing mechanism for this composite aerogel is introduced.},
doi = {10.1016/j.apsusc.2018.04.185},
journal = {Applied Surface Science},
number = C,
volume = 450,
place = {United States},
year = {2018},
month = {4}
}

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