Visible-Light-Activated Type II Heterojunction in Cu3(hexahydroxytriphenylene)2/Fe2O3Hybrids for Reversible NO2Sensing: Critical Role of π-π∗ Transition

Young Moo Jo, Kyeorei Lim, Ji Won Yoon, Yong Kun Jo, Young Kook Moon, Ho Won Jang, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Metal-organic frameworks (MOFs) with high surface area, tunable porosity, and diverse structures are promising platforms for chemiresistors; however, they often exhibit low sensitivity, poor selectivity, and irreversibility in gas sensing, hindering their practical applications. Herein, we report that hybrids of Cu3(HHTP)2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) nanoflakes and Fe2O3 nanoparticles exhibit highly sensitive, selective, and reversible detection of NO2 at 20 °C. The key parameters to determine their response, selectivity, and recovery are discussed in terms of the size of the Cu3(HHTP)2 nanoflakes, the interaction between the MOFs and NO2, and an increase in the concentration and lifetime of holes facilitated by visible-light photoactivation and charge-separating energy band alignment of the hybrids. These photoactivated MOF-oxide hybrids suggest a new strategy for designing high-performance MOF-based gas sensors.

Original languageEnglish
Pages (from-to)1176-1182
Number of pages7
JournalACS Central Science
Volume7
Issue number7
DOIs
Publication statusPublished - 2021 Jul 28

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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