김현우
2018-03-24T00:58:25Z
2018-03-24T00:58:25Z
2013-10
JAPANESE JOURNAL OF APPLIED PHYSICS, 2013, 52(10), P. 10MD01 (pages6)
0021-4922
http://iopscience.iop.org/article/10.7567/JJAP.52.10MD01
http://hdl.handle.net/20.500.11754/51691
We have fabricated Ag2O-functionalized In2O3 nanowires, in which the NO2 gas sensing properties are enhanced. To achieve the functionalization, the core In2O3 nanowires were sputter-deposited with the Ag shell layer, which turned out to be composed of cubic Ag particles. Subsequent thermal annealing changed the Ag nanoparticles to cubic nanoparticles with a cubic Ag2O phase. In spite of shell-coating and subsequent annealing, scanning electron microscopy images revealed that the products consisted of one-dimensional nanowires. In a NO2 gas sensing test, the sensitivity of the Ag2O-functionalized sensor was lower than that of the nonfunctionalized sensor, presumably owing to the significant volume of the depletion region in the Ag2O-In2O3 interface. However, the Ag2O-functionalized In2O3 nanowires exhibited exceptionally fast response and recovery compared with bare In2O3 nanowires. We suggest that not only the catalytic effect but also the spillover effect of Ag2O nanoparticles is mainly responsible for the observed enhancement of sensing capabilities in terms of response/recovery time. (C) 2013 The Japan Society of Applied Physics
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012029262).
en
2013 The Japan Society of Applied Physics
VACUUM THERMAL EVAPORATION
THIN-FILMS
NANOPARTICLE LAYERS
SPRAY-PYROLYSIS
SNO2 NANOWIRES
NO2 SENSORS
SOL-GEL
CATALYST
TEMPERATURE
SENSITIVITY
Enhanced Gas Sensing Characteristics of Ag2O-Functionalized Networked In2O3 Nanowires
Article
1
52
10.7567/JJAP.52.10MD01
1-6
JAPANESE JOURNAL OF APPLIED PHYSICS
Kim, Hyoun Woo
Na, Han Gil
Kwak, Dong Sub
Cho, Hong Yeon
Kwon, Yong Jung
2013010434
S
COLLEGE OF ENGINEERING[S]
DIVISION OF MATERIALS SCIENCE AND ENGINEERING
hyounwoo