DataVXAdvanced Materials TechnologiesPaper
journal article·2017-01

Quantum Confinement and Gas Sensing of Mechanically Exfoliated GaSe

Yecun Wu, Duan Zhang, Kangho Lee, Georg S. Duesberg, Askar Syrlybekov, Xiao Liu, Mourad Abid, Mohamed Abid, Yanqi Liu, Lisheng Zhang, Cormac Ó Coileáin, Hongjun Xu, Jiung Cho, Miri Choi, Byong Sun Chun, Haomao Wang, Huajun Liu, Han‐Chun Wu

Advanced Materials Technologies· Volume 2· Issue 1
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Source abstract

Abstract

GaSe layers with thicknesses ranging from a monolayer to 100 nm are successfully mechanically exfoliated for use in gas sensing. In combination with density functional theory calculations, general guidelines to determine the number of layers using Raman spectra are presented. With decreasing layer numbers, quantum confinement induces a red‐shift for out‐of‐plane modes and a blue‐shift for in‐plane modes. The relative Raman shifts of the out‐of‐plane vibrational modes and grow exponentially with decreasing stack thickness from 100 to 1 layers. Moreover, the change in first‐order temperature coefficient (χ) also increases exponentially as the number of layers is reduced, with the value of the first‐order temperature coefficient of the mode of monolayer GaSe (≈−1.99 × 10−2 cm−1 K−1) being almost double that of 100 layer GaSe (≈−1.22 × 10−2 cm−1 K−1). Finally, the exfoliated GaSe is used for gas sensing and shows high sensitivity, displaying a minimum detection limit of 4 ppm for NH3 at room temperature, confirming the potential of mechanically exfoliated GaSe in high‐sensitivity gas sensors.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 P. R. China

Elementary Educational College Beijing Key Laboratory for Nano‐Photonics and Nano‐Structure Capital Normal University Beijing 100048 P. R. China

CRANN and AMBER Trinity College Dublin Dublin 2 Ireland

School of Chemistry Trinity College Dublin Dublin 2 Ireland

Nazarbayev University 53 Kabanbai Batyra Ave. Astana 010000 Kazakhstan

Western Seoul Center Korea Basic Science Institute Seoul 03579 Republic of Korea

Chuncheon Center Korea Basic Science Institute Chuncheon 24341 Republic of Korea

Division of Industrial Metrology Korea Research Institute of Standards and Science Daejeon 305‐340 Republic of Korea

Experimental School Affiliated to Haidian Teachers Training College Beijing 100097 P. R. China

Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 P. R. China

Funding

Saudi Aramco · Science Foundation Ireland · Seventh Framework Programme

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