PbSe nanocrystal/TiOx heterostructured films: A simple route to nanoscale heterointerfaces and photocatalysis

Congjun Wang, Kwan Wook Kwon, Michael L. Odlyzko, Bo Hyun Lee, Moonsub Shim

Research output: Contribution to journalArticlepeer-review

Abstract

A simple approach to heterostructured thin film catalysts consisting of PbSe nanocrystals and layer-by-layer deposited TiOx is presented. Strong quantum confinement raises the conduction band of PbSe nanocrystals above that of TiOx, leading to a type II band offset. Photogenerated electrons in PbSe nanocrystals are transferred to catalytic TiOx which in turn initiate catalysis. Photocatalytic activity of the heterostructured films is found to be dependent on the size of the PbSe nanocrystals with the onset of catalysis coinciding at a photon energy of ∼2.5 times the band gap of the nanocrystals. Photocatalysis in the visible spectral region out to 650 nm is demonstrated.

Original languageEnglish (US)
Pages (from-to)11734-11741
Number of pages8
JournalJournal of Physical Chemistry C
Volume111
Issue number31
DOIs
StatePublished - Aug 9 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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