Honeycomb-like Periodic Porous LaFeO3 Thin Film Chemiresistors with Enhanced Gas-Sensing Performances
- Authors
- Dai, Zhengfei; Lee, Chul-Soon; Kim, Bo-Young; Kwak, Chang-Hoon; Yoon, Ji-Wook; Jeong, Hyun-Mook; Lee, Jong-Heun
- Issue Date
- 24-9월-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- perovskite structure; semiconducting metal oxides; micro/nanostructure; periodic array; gas sensor
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.18, pp.16217 - 16226
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 6
- Number
- 18
- Start Page
- 16217
- End Page
- 16226
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97372
- DOI
- 10.1021/am504386q
- ISSN
- 1944-8244
- Abstract
- The use of composite materials and polynary compounds is a promising strategy to promote conductometric sensor performances. The perovskite oxides provide various compositional combinations between different oxides for tuning gas-sensing reaction and endowing rich oxygen deficiencies for preferable gas adsorption. Herein, a sacrificial colloidal template approach is exploited to fabricate crystalline ternary LaFeO3 perovskite porous thin films, by transferring a La3+-Fe3+ hybrid solution-dipped template onto a substrate and sequent heat treatment. The honeycomb-like LaFeO3 film consisted of monolayer periodic pore (size: similar to 500 nm) array can be successfully in situ synthesized in a homogeneous layout with a single phase of perovskite. This periodic porous LaFeO3 film with p-type semiconductivity exhibits a high gas response, fast response (similar to 4 s), trace detection capacity (50 ppb), and favorable ethanol selectivity from similar acetone. It exhibits enhanced sensing performances compared to those of a binary n-type Fe2O3 film and a nontemplated dense LaFeO3 film. In addition, a five-axe spiderweb diagram is introduced to make a feasible evaluation of the optimal practical work condition, comprehensively regarding the response/recovery rate, gas response, selectivity and operating temperature. The enhanced ethanol sensing mechanism of honeycomb-like LaFeO3 periodic porous film is also addressed. This novel and facile route to fabricate well-ordered porous LaFeO3 thin film can also be applied to many fields to obtain special performances, such as solar cells, ion conductors, gas separation, piezoelectricity, and self-powered sensing device system.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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