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Sensitization of aluminum chloride adsorbed tin(IV) oxide nanocrystalline films with Rose Bengal

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
265
Issue
2
Identifiers
DOI: 10.1016/s0021-9797(03)00462-4
Keywords
  • Interfacial Spectroscopy And Photochemistry
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract The anionic dye Rose Bengal was found to surface chelate more strongly to SnO 2 nanocrystalline films previously kept immersed in a solution of washed and dried AlCl 3. Dye-sensitized photoelectrochemical cells made from such films exhibit enhanced quantum and energy conversion efficiencies. The result is explained as caused by binding of AlCl 3 to SnO 2 surface by elimination of Cl atoms and stronger bonding of Rose Bengal to Al, enhancing dye adsorption and suppression of back electron transfer by bridging of an Al atom between Sn and the dye molecule.

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