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Title: 3D MoS2 Aerogel for Ultrasensitive NO2 Detection and Its Tunable Sensing Behavior

Journal Article · · Advanced Materials Interfaces
ORCiD logo [1];  [2];  [2];  [2];  [3];  [3];  [4];  [2];  [5];  [2]
  1. Univ. of California, Berkeley, CA (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
  2. Univ. of California, Berkeley, CA (United States)
  3. Huazhong Univ. of Science and Technology, Wuhan (China)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A high-performance NO2 sensor based on the 3D MoS2 aerogel is introduced. Compared to single- or few-layer MoS2, 3D assemblies of 2D MoS2 provide more surface area per footprint with a simple and scalable synthesis. Integration of the 3D MoS2 aerogel on a low-power microheater platform is demonstrated, and the sensing behavior of the 3D MoS2 aerogel is investigated. A two-step sulfurization treatment is developed to obtain a high-quality MoS2 aerogel with strong sensing performance. The aerogel exhibits low detection limit (50 ppb) toward NO2 at room temperature, while after the two-step sulfurization treatment, it also exhibits fast response and recovery at low heater temperature of 200 °C, with no decrease in sensitivity. The observed p-type sensing behavior of MoS2 aerogel is discussed and identified as being controlled by the defect state (as probed by the S:Mo ratio). Furthermore, annealing in a hydrogen environment changes the defect state of the MoS2 aerogel by creating more sulfur vacancies; concomitantly, a transition from p-type sensing behavior to n-type sensing is observed

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
Grant/Contract Number:
AC52-07NA27344; AC02‐05CH11231; FA9550‐14‐1‐0323; AC02-05CH11231; KC2207
OSTI ID:
1548333
Alternate ID(s):
OSTI ID: 1376745
Report Number(s):
LLNL-JRNL-769872; 960996
Journal Information:
Advanced Materials Interfaces, Vol. 4, Issue 16; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (8)

MoS 2 -Carbon Nanotube Hybrid Material Growth and Gas Sensing journal September 2017
High‐Performance NO 2 Sensors Based on Ultrathin Heterogeneous Interface Layers journal November 2019
Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS 2 Nanotubes journal November 2018
Versatile Aerogels for Sensors journal September 2019
Synthesis of amorphous MoSx and MoSx/carbon nanotubes composite aerogels as effective hydrogen evolution reaction catalysts journal September 2018
On-chip assembly of 3D graphene-based aerogels for chemiresistive gas sensing journal January 2020
Novel gas sensing platform based on a stretchable laser-induced graphene pattern with self-heating capabilities journal January 2020
Two-Step Exfoliation of WS2 for NO2, H2 and Humidity Sensing Applications journal September 2019

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