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Title: High Surface Area MoS 2/Graphene Hybrid Aerogel for Ultrasensitive NO 2 Detection

A MoS 2/graphene hybrid aerogel synthesized with two-dimensional MoS 2 sheets coating a high surface area graphene aerogel scaffold is characterized and used for ultrasensitive NO 2 detection. The combination of graphene and MoS 2 leads to improved sensing properties with the graphene scaffold providing high specific surface area and high electrical and thermal conductivity and the single to few-layer MoS2 sheets providing high sensitivity and selectivity to NO 2. The hybrid aerogel is integrated onto a low-power microheater platform to probe the gas sensing performance. At room temperature, the sensor exhibits an ultralow detection limit of 50 ppb NO 2. By heating the material to 200 °C, the response and recovery times to reach 90% of the final signal decrease to <1 min, while retaining the low detection limit. The MoS 2/graphene hybrid also shows good selectivity for NO 2 against H 2 and CO, especially when compared to bare graphene aerogel. The unique structure of the hybrid aerogel is responsible for the ultrasensitive, selective, and fast NO 2 sensing. The improved sensing performance of this hybrid aerogel also suggests the possibility of other 2D material combinations for further sensing applications.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [3] ;  [2] ;  [5] ;  [2]
  1. Univ. of California, Berkeley, CA (United States). Berkeley Sensor & Actuator Center; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Huazhong Univ. of Science and Technology, Wuhan (China)
  2. Univ. of California, Berkeley, CA (United States). Berkeley Sensor & Actuator Center; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of California, Berkeley, CA (United States). Kavli Energy NanoSciences Inst.
  4. Huazhong Univ. of Science and Technology, Wuhan (China)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
Publication Date:
Report Number(s):
LLNL-JRNL-702422
Journal ID: ISSN 1616-301X
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; FA9550-14-1-0323; IIP 1444950
Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 26; Journal Issue: 28; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); China Scholarship Council; US Air Force Office of Scientific Research (AFOSR)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; molybdenum disulfide; graphene; hybrid aerogel; gas sensor; microheater
OSTI Identifier:
1410012
Alternate Identifier(s):
OSTI ID: 1440935