NDLI: Transient Absorption of N719 and its Electron Transfer Kinetics on ZnO Nanoparticles Surface

Content Provider	Springer Nature Link
Author	Yu, Li Hong Xi, Jing Yu Lo, Kin Cheung Antrobus, Lucy Jane Phillips, David Lee Chan, Wai Kin
Copyright Year	2014
Abstract	The transient absorption and emission spectra of ruthenium complex sensitizer N719 under excitation in different solvents were studied. Isopropanol was found to stabilize the singlet excited state of N719. An emission band centered at 460 nm resulting from the singlet excited state of N719 was observed at 1 ns time delay, which is much longer than the reported observation time of the singlet excited state of N719. The triplet excited state of N719 undergoes photophysical decay in acetonitile and isopropanol with lifetimes of around 40 ns, while it may encounter photochemical reactions in water resulting in long living intermediate. The sensitizer was introduced to the surface of three types of ZnO nanoparticles with different morphology, which were used as the electron acceptors upon photoexcitation. The electron transfer dynamics between sensitized N719 and ZnO interface both in the presence and absence of electrolyte were studied by time-correlated single photon counting technique, nanosecond transient absorption and emission spectroscopies. It was revealed that the electrolyte has a significant impact upon the electron transfer dynamics at the N719-ZnO interface. In the absence of electrolyte, the electron transfer process at the N719-ZnO interface is dependent on the depth of defects in ZnO nanoparticles. Conversely, in the presence of electrolyte, ZnO defects show no impacts on the electron transfer process at the N719-ZnO interface and effective electron injection happens similarly from the excited N719 to ZnO in spite of ZnO particle sizes.
Starting Page	169
Ending Page	175
Page Count	7
File Format	PDF
ISSN	15741443
Journal	Journal of Inorganic and Organometallic Polymers and Materials
Volume Number	25
Issue Number	1
e-ISSN	15741451
Language	English
Publisher	Springer US
Publisher Date	2014-10-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Transient absorption spectroscopy Ruthenium complexes Electron transfer Zinc oxide Inorganic Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Polymers and Plastics

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