Plasmon-Enhanced Sub-Bandgap Photocatalysis via Triplet-Triplet Annihilation Upconversion for Volatile Organic Compound Degradation

Hyoung Il Kim, Seunghyun Weon, Homan Kang, Anna L. Hagstrom, Oh Seok Kwon, Yoon Sik Lee, Wonyong Choi, Jae Hong Kim

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

This study demonstrates the first reported photocatalytic decomposition of an indoor air pollutant, acetaldehyde, using low-energy, sub-bandgap photons harnessed through sensitized triplet-triplet annihilation (TTA) upconversion (UC). To utilize low-intensity noncoherent indoor light and maximize photocatalytic activity, we designed a plasmon-enhanced sub-bandgap photocatalyst device consisting of two main components: (1) TTA-UC rubbery polymer films containing broad-band plasmonic particles (Ag-SiO2) to upconvert sub-bandgap photons, and (2) nanodiamond (ND)-loaded WO3 as a visible-light photocatalyst composite. Effective decomposition of acetaldehyde was achieved using ND/WO3 (Eg = 2.8 eV) coupled with TTA-UC polymer films that emit blue photons (λEm = 425 nm, 2.92 eV) upconverted from green photons (λEx = 532 nm, 2.33 eV), which are wasted in most environmental photocatalysis. The overall photocatalytic efficiency was amplified by the broad-band surface plasmon resonance of AgNP-SiO2 particles incorporated into the TTA-UC films.

Original languageEnglish
Pages (from-to)11184-11192
Number of pages9
JournalEnvironmental Science and Technology
Volume50
Issue number20
DOIs
Publication statusPublished - 2016 Oct 18

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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