Cyanobacterial chlorophyll as a sensitizer for colloidal TiO2
By:Kathiravan, A (Kathiravan, A.)[ 1 ] ; Chandramohan, M (Chandramohan, M.)[ 2 ] ; Renganathan,
R (Renganathan, R.)[ 1 ] ; Sekar, S (Sekar, S.)[ 2 ]
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume: 71
Issue: 5
Pages: 1783-1787
DOI: 10.1016/j.saa.2008.06.031
Published: JAN 2009
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Abstract
Chlorophyll has been extracted from cyanobacteria. The adsorption of chlorophyll on the surface of
colloidal TiO2 through electrostatic interaction was observed. The apparent association constant
(K,,p) of chlorophyll-TiO2 obtained from absorption spectra is 3.78 x 10(4) M-1. The K-app value of
chlorophyll-TiO2 as determined from fluorescence spectra is 1.81 x 10(4) M-1, which matches well
with that determined from the absorption spectra changes. These data indicate that there is an
interaction between chlorophyll and colloidal TiO2 nanoparticle surface. The dynamics of
photoinduced electron transfer from chlorophyll to the conduction band of colloidal TiO2 nanoparticle
has been observed and the mechanism of electron transfer has been confirmed by the calculation of
free energy change (Delta G(et)) by applying Rehm-Weller equation as well as energy level diagram.
Lifetime measurements gave the rate constant (k(et)) for electron injection from the excited state
chlorophyll into the conduction band of TiO2 is 4.2 x 10(8) s(-1). (C) 2008 Elsevier B.V. All rights
reserved.
Keywords
Author Keywords:TiO2 colloid; Fluorescence quenching; Chlorophyll
KeyWords Plus:PHOTOINDUCED INTERACTION; ELECTRON-TRANSFER; PARTICULATE
SYSTEMS; PHOTO-SENSITIZATION; FLASH-PHOTOLYSIS; PHOTOSYSTEM-II; HYPOCRELLINB; CYANINE DYE; PHOTOSENSITIZATION; SEMICONDUCTOR
Author Information
Reprint Address: Renganathan, R (reprint author)
Bharathidasan Univ, Sch Chem, Tiruchchirappalli 620024, India.
Addresses:
[ 1 ] Bharathidasan Univ, Sch Chem, Tiruchchirappalli 620024, India
[ 2 ] Bharathidasan Univ, Dept Biotechnol, Tiruchchirappalli 620024, India
E-mail Addresses:rrengas@gmail.com
Funding
Funding Agency
Grant Number
01(2217)/08/EMR-11
CSIR, Government of India
dt.06/05/2008
Department of Science and Technology, New Delhi, Government of India
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Publisher
PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON,
OXFORD OX5 1GB, ENGLAND
Categories / Classification
Research Areas:Spectroscopy
Web of Science Categories:Spectroscopy
Document Information
Document Type:Article
Language:English
Accession Number: WOS:000261900000026
PubMed ID: 18678524
ISSN: 1386-1425
Other Information
IDS Number: 386RJ
Cited References in Web of Science Core Collection: 33
Times Cited in Web of Science Core Collection: 9