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Microsyst Nanoeng

Title:		Voltage-controlled NiO/ZnO p-n heterojunction diode: a new approach towards selective VOC sensing
Author(s):		Dey S; Nag S; Santra S; Ray SK; Guha PK;
Address:		"Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology, Kharagpur, 721302 India. ISNI: 0000 0001 0153 2859. GRID: grid.429017.9 Department of Electrical Engineering, National Institute of Technology, Agartala, 99046 India. ISNI: 0000 0004 1773 6380. GRID: grid.444294.b Department of Physics, Indian Institute of Technology, Kharagpur, 721302 India. ISNI: 0000 0001 0153 2859. GRID: grid.429017.9 Department of Physics, Belda College, Belda, 721424 India. S N Bose National Centre for Basic Sciences, Kolkata, 700106 India. ISNI: 0000 0001 2188 427X. GRID: grid.452759.8"
Journal Title:		Microsyst Nanoeng
Year:		2020
Volume:		20200601
Issue:
Page Number:		35 -
DOI:		10.1038/s41378-020-0139-1
ISSN/ISBN:		2055-7434 (Electronic) 2096-1030 (Print) 2055-7434 (Linking)
Abstract:		"Metal oxide resistive gas sensors suffer from poor selectivity that restricts their practical applicability. Conventional sensor arrays are used to improve selectivity which increased the system complexity. Here, we have proposed a novel NiO/ZnO-based p-n junction single-diode device for selective sensing of several volatile organic compounds (VOCs) simultaneously by tuning bias voltage. The operating voltage was varied between 3 and 5 volts to achieve selective sensing of 2-propanol (19.1 times for 95 ppm with response and recovery times of 70 s and 55 s respectively' at 3 volts), toluene (20.1 times for 95 ppm with response and recovery times of 100 s and 60 s respectively, at 4 volts), and formaldehyde (11.2 times for 95 ppm with response and recovery times of 88 s and 54 s respectively, at 5 volts). A probable mechanism of the tunable selectivity with operating bias voltage due to increase in surface carriers with increasing voltage was hence put forth. Thus, this device may play an important role to develop future selective multiple VOC sensor thereby replacing standard sensor arrays"
Keywords:		"Electrical and electronic engineering Environmental, health and safety issues;"
Notes:		"PubMed-not-MEDLINEDey, Sayan Nag, Swati Santra, Sumita Ray, Samit Kumar Guha, Prasanta Kumar eng England 2020/06/01 Microsyst Nanoeng. 2020 Jun 1; 6:35. doi: 10.1038/s41378-020-0139-1. eCollection 2020"