Chemical vapor sensing properties of graphene based on geometrical evaluation
- Chemical vapor sensing properties of graphene based on geometrical evaluation
- Sukju Hwang; Juhwan Lim; Hyung Goo Park; Whan Kyun Kim; Duck-Hwan Kim; In Sang Song; 김재헌; 이석; 우덕하; Seong Chan Jun
- Chemical vapor sensing; graphene; Mechanical cleavage; Gas sensor
- Issue Date
- Current applied physics
- VOL 12, NO 4, 1017-1022
- Graphene is a promising candidate for chemical vapor sensing.We prepared graphene sheets from highly
oriented pyrolytic graphite through mechanical cleavage in order to investigate their responses to NH3
and NO2 as electron donors and acceptors, respectively. We investigated how the geometric characteristics
of graphene, such as length-to-width (L/w) ratio and number of layers, affect chemical sensing
properties at room temperature and ambient atmosphere. In this study, the L/w ratio of an individual
graphene sheet, which is related to graphene conductivity, dominated the NH3 sensing characteristics,
while the number of graphene layers had no significant effect. We also studied the effects of various
thermal treatments on graphene sensitivity and recovery time in an ambient atmosphere. This study
confirms the effects of geometry, operation temperature and gas concentration on the NH3 and NO2
sensing performances of graphene.
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- KIST Publication > Article
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