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Journal of Nanomaterials
Volume 2013 (2013), Article ID 695107, 5 pages
Research Article

Near-Infrared Indocyanine Materials for Bioanalysis and Nano-TiO2 Photoanodes of Solar Cell

College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China

Received 30 March 2013; Revised 25 May 2013; Accepted 3 June 2013

Academic Editor: Xinqing Chen

Copyright © 2013 Liqiu Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Two near-infrared fluorescence N-p-carboxybenzyl indocyanines with the maxima fluorescence emission wavelengths of 565 nm and 641 nm in water, respectively, were synthesized by the ultrasonic method. Compared with those in water, the fluorescence intensity of the dyes became weaker in the solution of an alkali, alkaline-earth, or transition metal ion, except in Ag+ or Zn2+; in the solution of α-cyclodextrin or β-cyclodextrin, the fluorescence intensity of them was increased, even under strong acidic condition. The indocyanines were converted into their succinimidyl active ester for conjugating with NH2 groups of lysine or BSA. Porous nano-TiO2 film with 68~75 nm thickness was prepared on ITO conductive glass from tetrabutyl titanate by sol-gel. FESEM showed that the diameter of the nano-TiO2 particle was 30~50 nm and the pore size was 200~300 nm. The indocyanines with or without the presence of the alkali, alkaline-earth, transition metal ion, or cyclodextrin could make the nano-TiO2 films sensitized, and the products could be used as anodes for dye-sensitized solar cells.