Structural changes accompanying interfacial charge transfer between dye/TiO2 nanoparticles studied by transient X-ray absorption spectroscopy

Xiaoyi Zhang*, Grigory Smolentsev, Sophie Canton, Klaus Attenkofer, Villy Sundström, Lin X Chen

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Photo-induced interfacial electron transfer between the dye and semiconductor nanocrystalline has important applications in solar cells, quantum dot devices and photocatalytic hydrogen generation. Chemical and electronic properties of the species undergoing photoinduce electron transfer are determined largely by their static and transient structures of the ground and excited states. Directly visualizing these structures is necessary for molecular/material designs for targeted functions, therefore, realizing the rational designs of solar cells. X-ray transient absorption or laser-initiated, time-resolved X-ray absorption spectroscopy (XTA or LITR-XAS) has been used to probe the photo-induced structural changes at dye-nanoparticle interface. Two examples will be presented: Ru(dcbpy)2(NCS)2 and Os(dcbpy)2(CN)2 adsorbed to TiO2 nanoparticle surface. The photoexcited Ru and Os complexes inject electrons into the conduction band of TiO2, leading to an interfacial charge separated state, (TiO2)n-/(dye)+. The electronic configuration as well as the internuclear distance changes of metal complexes in the charge separation state has been observed. These measurements demonstrate a significant potential of using LITR-XAS to study the interfacial phenomena at surface of nonmaterial in solar fuel generation.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Aug 25 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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