Improvement of Gas-Sensing Performance of Large-Area Tungsten Disulfide Nanosheets by Surface Functionalization.
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 (WS2) nanosheets through surface functionalization using Ag nanowires (NWs). Large-area WS2nanosheets were synthesized through atomic layer deposition of WO3followed by sulfurization. The pristine WS2gas sensors exhibited a significant response to acetone and NO2but an incomplete recovery in the case of NO2sensing. After AgNW functionalization, the WS2gas sensor showed dramatically improved response (667%) and recovery upon NO2exposure. Our results establish that the proposed method is a promising strategy to improve 2D TMDC gas sensors.
Kyung Yong
KY
Ko
Jeong-Gyu
JG
Song
Youngjun
Y
Kim
Taejin
T
Choi
Sera
S
Shin
Chang Wan
CW
Lee
Kyounghoon
K
Lee
Department of Physics, Konkuk University , 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
Jahyun
J
Koo
Department of Physics, Konkuk University , 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea.
Hoonkyung
H
Lee
Jongbaeg
J
Kim
Taeyoon
T
Lee
Jusang
J
Park
Hyungjun
H
Kim
gas sensor; silver nanowire; surface functionalization; transition metal dichalcogenide; tungsten disulfide nanosheet