ZnTe-coated ZnO nanorods: Hydrogen sulfide nano-sensor purely controlled by pn junction

Materials & Design

Seung-Mo Lee¹  Truong Thi Hien²  Dojin Kim²  Cao Van Phuoc³  Nguyen Minh Hieu³  Nguyen Duc Quang³  Nguyen Duc Chinh³  Nguyen Manh Hung³  Jong-Ryul Jeong³  Chunjoong Kim⁴  Do Van Lam⁴ 

[1] Department of Materials Science and Engineering, Le Quy Don Technical University, Hanoi 100000, Viet Nam;Nano Mechatronics, Korea University of Science and Technology, Daejeon 34103, Republic of Korea;Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea;Department of Nanomechanics, Korea Institute of Machinery and Materials, Daejeon 34103, Republic of Korea;

关键词: ZnO gas sensor;    H2S gas sensor;    p-n junction;    Nanosensor;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, the double hydrothermal method is proposed as a facile approach to the synthesis of ZnTe/ZnO core–shell nanorods. The coating thickness of the p-type ZnTe is varied to adjust the junction depth in the n-type ZnO nanorods, and the conductance measurements reveal the change in the conduction path in the heterojunction structures. Structural and chemical investigations conducted using X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy confirm the hetero-nanostructure formation of ZnTe/ZnO. The role of ZnTe in H2S-gas sensing by the ZnO nanorods is discussed. The enhanced sensing performance observed with a thin ZnTe coating confirms the importance of the base resistance of the nano-transducer in achieving high response characteristics. The composite structure also demonstrates a superior sensing performance of good repeatability, stability, linearity, and gas selectivity at temperatures greater than 200 °C.

【 授权许可】

Unknown