Microwave-Assisted Generation of Secondary Nanoparticles and Flame-Assisted Generation of an Amorphous Layer for Improving NO2 Gas Sensing Behaviors: A Mini Review
- Authors
- Kang, Sukwoo; Shin, Ka Yoon; Oum, Wansik; Yu, Dong Jae; Kim, Eun Bi; Kim, Hyeong Min; Mirzaei, Ali; Kim, Jin-Young; Nam, Myung Sung; Kim, Tae Un; Lee, Myung Hoon; Bharath, Somalapura Prakasha; Pawar, Krishna Kiran; Kim, Sang Sub; Kim, Hyoun Woo
- Issue Date
- Apr-2023
- Publisher
- Springer Science and Business Media Deutschland GmbH
- Keywords
- Amorphous carbon; Gas sensor; Graphene; NO2 sensing; Tin oxide
- Citation
- Lecture Notes in Electrical Engineering, v.1035, pp 55 - 62
- Pages
- 8
- Indexed
- SCOPUS
- Journal Title
- Lecture Notes in Electrical Engineering
- Volume
- 1035
- Start Page
- 55
- End Page
- 62
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185844
- DOI
- 10.1007/978-3-031-29871-4_7
- ISSN
- 1876-1100
1876-1119
- Abstract
- This mini review is comprised of two approaches of the enhancement of gas sensor response: microwave-assisted and flame-assisted strategies. To achieve enhancement, defects and surface modifications must be addressed. When a SnO2-graphene mixture is irradiated with microwaves, SnO2 acquires oxygen vacancies because carbon takes oxygen away from its surroundings. An oxygen vacancy, a type of defect, creates free electrons, increasing the response [1]. In addition, decoration with amorphous carbon, which is a type of surface modification, establishes a heterojunction in the main substance [2]. The heterojunction leads to rectification; hence, electrons flow in one direction to balance the electron concentration. A change in the concentration of electrons affects electron mobility. The gas sensor response is affected by the mobility and concentration of electrons. Oxygen vacancies create electrons according to the Kröger-Vink equation, and heterojunctions accelerate electrons. The sensor response changes when the metal oxide semiconductor gas sensor is exposed to oxidizing and reducing gases. When a substance is oxidized, surface functional groups lose their electrons to remain in equilibrium. Oxygen, a surface functional group, loses electrons and traps them as ions on the surface, resulting in band-bending [3]. Therefore, defects and decorations increase gas sensor response.
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