title: Honeycomb-like periodic porous LaFeO₃ thin film chemiresistors with enhanced gas-sensing performances.
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 La(3+)-Fe(3+) hybrid solution-dipped template onto a substrate and sequent heat treatment. The honeycomb-like LaFeO3 film consisted of monolayer periodic pore (size: ∼ 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 (∼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.
authors.affiliation: Department of Materials Science and Engineering, Korea University , Seoul 136-713, Republic of Korea.
authors.forename: Zhengfei
authors.initials: Z
authors.lastname: Dai
authors.forename: Chul-Soon
authors.initials: CS
authors.lastname: Lee
authors.forename: Bo-Young
authors.initials: BY
authors.lastname: Kim
authors.forename: Chang-Hoon
authors.initials: CH
authors.lastname: Kwak
authors.forename: Ji-Wook
authors.initials: JW
authors.lastname: Yoon
authors.forename: Hyun-Mook
authors.initials: HM
authors.lastname: Jeong
authors.forename: Jong-Heun
authors.initials: JH
authors.lastname: Lee
keywords: gas sensor; micro/nanostructure; periodic array; perovskite structure; semiconducting metal oxides