3D MoS2 Aerogel for Ultrasensitive NO2 Detection and Its Tunable Sensing Behavior
Abstract
A high‐performance NO2 sensor based on the 3D MoS2 aerogel is presented. 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 investigated and identified as being controlled by the defect state (as probed by the S:Mo ratio). It is demonstrated that 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 10, 2017
- Source ID
- 10.1002/admi.201700217
Entities
People
- Alex Zettl
- Anna Harley‐trochimczyk
- Carlo Carraro
- Hu Long
- Leslie Chan
- Lunet E. Luna
- Marcus A. Worsley
- Roya Maboudian
- Tielin Shi
- Zirong Tang
Organizations
- Air Force Office of Scientific Research
- Huazhong University of Science and Technology
- Lawrence Berkeley National Laboratory
- Lawrence Livermore National Laboratory
- National Science Foundation
- United States Department of Energy
- University of California, Berkeley