Honeycomb-like periodic porous LaFeO3 thin film chemiresistors with enhanced gas-sensing performances

Zhengfei Dai, Chul Soon Lee, Bo Young Kim, Chang Hoon Kwak, Ji Wook Yoon, Hyun Mook Jeong, Jong Heun Lee

Research output: Contribution to journalArticle

68 Citations (Scopus)

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: 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 ntype 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.

Original languageEnglish
Pages (from-to)16217-16226
Number of pages10
JournalACS Applied Materials and Interfaces
Volume6
Issue number18
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Gases
Thin films
Perovskite
Ethanol
Oxides
Gas adsorption
Piezoelectricity
Acetone
Pore size
Monolayers
Solar cells
Tuning
Heat treatment
lanthanum iron oxide
Crystalline materials
Recovery
Oxygen
Ions
Sensors
Composite materials

Keywords

  • Gas sensor
  • Micro/nanostructure
  • Periodic array
  • Perovskite structure
  • Semiconducting metal oxides

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Honeycomb-like periodic porous LaFeO3 thin film chemiresistors with enhanced gas-sensing performances. / Dai, Zhengfei; Lee, Chul Soon; Kim, Bo Young; Kwak, Chang Hoon; Yoon, Ji Wook; Jeong, Hyun Mook; Lee, Jong Heun.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 18, 01.01.2014, p. 16217-16226.

Research output: Contribution to journalArticle

Dai, Zhengfei ; Lee, Chul Soon ; Kim, Bo Young ; Kwak, Chang Hoon ; Yoon, Ji Wook ; Jeong, Hyun Mook ; Lee, Jong Heun. / Honeycomb-like periodic porous LaFeO3 thin film chemiresistors with enhanced gas-sensing performances. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 18. pp. 16217-16226.
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