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Highly Sensitive and Selective PbTiO3 Gas Sensors with Negligible Humidity Interference in Ambient Atmosphere

Authors
Ma, Xing-HuaLi, Hua-YaoKweon, Sang-HyoJeong, Seong-YongLee, Jong-HeunNahm, Sahn
Issue Date
6-2월-2019
Publisher
AMER CHEMICAL SOC
Keywords
PbTiO3 nanoplate; gas sensor; ethanol; humidity interference; selectivity
Citation
ACS APPLIED MATERIALS & INTERFACES, v.11, no.5, pp.5240 - 5246
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
11
Number
5
Start Page
5240
End Page
5246
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/67657
DOI
10.1021/acsami.8b18428
ISSN
1944-8244
Abstract
Three PbTiO3 nanostructures were synthesized using a one-step hydrothermal reaction with different TiO2 powders as Ti sources, and their gas-sensing properties were investigated. The sensor comprising PbTiO3 nanoplates (NPs) exhibited a high response (resistance ratio = 80.4) to S ppm ethanol at 300 degrees C and could detect trace concentrations of ethanol down to 100 ppb. Moreover, the sensor showed high ethanol selectivity and nearly the same sensing characteristics despite the wide range of humidity variation from 20 to 80% RH. The mechanism for humidity-independent gas sensing was elucidated using diffuse reflectance infrared Fourier transform spectra. PbTiO3 NPs are new and promising sensing materials that can be used for detecting ethanol in a highly sensitive and selective manner with negligible interference from ambient humidity.
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