Improvement of Gas-Sensing Performance of Large-Area Tungsten Disulfide Nanosheets by Surface Functionalization.
basic_science · Level V
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- Record sourced from PubMed, PMID 27666720.
- Also identified by DOI 10.1021/acsnano.6b03631.
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Abstract
Semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDCs) are promising gas-sensing materials due to their large surface-to-volume ratio. However, their poor gas-sensing performance resulting from the low response, incomplete recovery, and insufficient selectivity hinders the realization of high-performance 2D TMDC gas sensors. Here, we demonstrate the improvement of gas-sensing performance of large-area tungsten disulfide (WS<sub>2</sub>) nanosheets through surface functionalization using Ag nanowires (NWs). Large-area WS<sub>2</sub> nanosheets were synthesized through atomic layer deposition of WO<sub>3</sub> followed by sulfurization. The pristine WS<sub>2</sub> gas sensors exhibited a significant response to acetone and NO<sub>2</sub> but an incomplete recovery in the case of NO<sub>2</sub> sensing. After AgNW functionalization, the WS<sub>2</sub> gas sensor showed dramatically improved response (667%) and recovery upon NO<sub>2</sub> exposure. Our results establish that the proposed method is a promising strategy to improve 2D TMDC gas sensors.