Jong Won Baek
Yoon Hwa Kim
Jaewan Ahn
Dong-Ha Kim
Hamin Shin
Jaehyun Ko
Seyeon Park
Chungseong Park
Euichul Shin
Jang, Ji Soo
Il-Doo Kim
2024-01-12T02:35:53Z
2024-01-12T02:35:53Z
2022-10-27
2022-11
2050-7488
https://pubs.kist.re.kr/handle/201004/75959
It is well known that certain gas molecules can serve as specific markers for characterizing the physiological and environmental nature of a subject, such as acetylene gas which can be used for determining a person's smoking status as well as for monitoring air pollution levels. For their reliable detection, gas sensors should be designed with high sensing capabilities in terms of selectivity, sensitivity and low detection limit. In this work, we present a rational design approach for the synthesis of p-type LaFeO3/n-type SnO2 composite nanotubes (NTs) via galvanic replacement reaction (GRR) on electrospun perovskite LaFeO3 NTs for p？n type-converted sensing. The GRR process provides LaFeO3/SnO2 NTs with high surface area (146.6 m2 g？1) by generating SnO2 nanograins (<10 nm), as controlled by varying the reaction time. The abundant heterogeneous p？n junctions formed in LaFeO3/SnO2 NTs contribute to the dramatic improvements in their sensing characteristics. In fact, the LaFeO3/SnO2 NTs exhibited 31.2-fold increased response toward acetylene (5 ppm) with a far improved response speed (16 s) compared to that of pristine LaFeO3 NTs (64 s). Our results demonstrate that the GRR process can be used to engineer the morphology and composition of p-type perovskites to achieve exceptional chemical sensing performances.
English
Royal Society of Chemistry
Galvanic replacement reaction in perovskite oxide for superior chemiresistors
Article
10.1039/D2TA05338A
1
Journal of Materials Chemistry A, v.10, no.43, pp.23282 - 23293
Journal of Materials Chemistry A
10
43
23282
23293
N
scie
scopus
000871606600001
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Energy & Fuels
Materials Science
Article
GAS-SENSING PROPERTIES
GRAIN-SIZE
SENSORS
FILMS
C2H2
SENSITIVITY
SNO2