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Choi, Sun Young; Kim, Yonghun; Chung, Hee-Suk; Kim, Ah Ra; Kwon, Jung-Dae; Park, Jucheol; Kim, Young Lae; Kwon, Se-Hun; Hahm, Myung Gwan; Cho, Byungjin
ACS applied materials & interfaces, 02/2017, Letnik: 9, Številka: 4Journal Article
Here, we report that Nb doping of two-dimensional (2D) MoSe2 layered nanomaterials is a promising approach to improve their gas sensing performance. In this study, Nb atoms were incorporated into a 2D MoSe2 host matrix, and the Nb doping concentration could be precisely controlled by varying the number of Nb2O5 deposition cycles in the plasma enhanced atomic layer deposition process. At relatively low Nb dopant concentrations, MoSe2 showed enhanced device durability as well as NO2 gas response, attributed to its small grains and stabilized grain boundaries. Meanwhile, an increase in the Nb doping concentration deteriorated the NO2 gas response. This might be attributed to a considerable increase in the number of metallic NbSe2 regions, which do not respond to gas molecules. This novel method of doping 2D transition metal dichalcogenide-based nanomaterials with metal atoms is a promising approach to improve the performance such as stability and gas response of 2D gas sensors.
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