Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel

Yan, Wenjun; Worsley, Marcus A.; Pham, Thang; Zettl, Alex; Carraro, Carlo; Maboudian, Roya

doi:10.1016/j.apsusc.2018.04.185

Title: Effects of ambient humidity and temperature on the NO₂ sensing characteristics of WS₂/graphene aerogel

Journal Article · Sun Apr 22 00:00:00 EDT 2018 · Applied Surface Science

DOI:https://doi.org/10.1016/j.apsusc.2018.04.185· OSTI ID:1548316

Yan, Wenjun ^[1]; Worsley, Marcus A. ^[2]; Pham, Thang ^[3]; Zettl, Alex ^[3]; Carraro, Carlo ^[4]; Maboudian, Roya ^[4]

Univ. of California, Berkeley, CA (United States); Hangzhou Dianzi Univ., Hangzhou (China)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; FA9550-14-1-0323

OSTI ID:: 1548316

Alternate ID(s):: OSTI ID: 1548412

Report Number(s):: LLNL-JRNL-750568; 936041

Journal Information:: Applied Surface Science, Vol. 450, Issue C; ISSN 0169-4332

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 76 works

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Title: Effects of ambient humidity and temperature on the NO2 sensing characteristics of WS2/graphene aerogel

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Title: Effects of ambient humidity and temperature on the NO₂ sensing characteristics of WS₂/graphene aerogel