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Home ยป Charge separation in donor-acceptor spiro compounds at metal and metal oxide surfaces investigated by surface photovoltage.

Charge separation in donor-acceptor spiro compounds at metal and metal oxide surfaces investigated by surface photovoltage.

TitleCharge separation in donor-acceptor spiro compounds at metal and metal oxide surfaces investigated by surface photovoltage.
Publication TypeJournal Article
Year of Publication2013
AuthorsDittrich, T, Macor, L, Gervaldo, M, Fungo, F, Otero, L, Lin, CY, Chi, LC, Fang, FC, Lii, SW, Wong, KT, Tsai, CH, Wu, CC
JournalJ Nanosci Nanotechnol
Volume13
Issue7
Pagination5158-63
Date Published2013 Jul
ISSN1533-4880
KeywordsElectromagnetic Fields, Electron Transport, Light, Materials Testing, Metal Nanoparticles, Oxides, Surface Properties
Abstract

Molecules with donor (diphenylamine) and acceptor moieties (dicyano or cyanoacrylic acid moieties) were linked by fluorene or spirobisfluorene cores and the chain length has been changed by introducing a thiophene group between fluorene and diphenylamine. Four different kinds of fluorene and spirobisfluorene compounds were adsorbed from highly diluted solutions at ultra-thin nanoporous TiO2 (np-TiO2), Au and ITO surfaces. Charge separation has been investigated by surface photovoltage spectroscopy in the fixed capacitor and Kelvin probe arrangements in vacuum. Striking differences between the interaction of linking (dicyano or cyanoacrylic moieties) and different substrates were observed. Intra-molecular charge separation and electron injection have been distinguished and the directed adsorption of spiro compounds was deduced.
Alternate JournalJ Nanosci Nanotechnol
PubMed ID23901546