Employing a photosynthetic antenna complex to interfacial electron transfer on ZnO quantum dot

Verma, Sandeep ; Gupta, Alka ; Sainis, Jayashree K. ; Ghosh, Hirendra N. (2011) Employing a photosynthetic antenna complex to interfacial electron transfer on ZnO quantum dot Journal of Physical Chemistry Letters, 2 (8). pp. 858-862. ISSN 1948-7185

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jz2002474

Related URL: http://dx.doi.org/10.1021/jz2002474


Photosynthetic antenna complexes exhibit unidirectional energy-transport phenomena, which make them potential photosensitizers in interfacial electron-transfer processes. In the present study, we show the antenna function of phycocyanin-allophycocyanin (PC−APC) complex using transient emission and absorption spectroscopy. Interfacial electron-transfer dynamics in the PC−APC complex sensitized ZnO semiconductor quantum dot material is compared in native and denatured conditions. The downhill sequential energy transfer from a peripheral phycocyanin disk to a core allophycocyanin disk opens a new electron injection pathway from the allophycocyanin disk in addition to primary electron injection from directly photoexcited phycocyanin disk. Further, the large association of phycocayanobilin chromophores in PC−APC conjugates stabilizes the positive charge within the sensitizer, which leads to slower charge recombination in comparison to that in denatured condition. This study displays the antenna function of energy-efficient biomolecules in favor of better charge separation across the semiconductor interface.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
Keywords:Allophycocyanin; Electron Transfer; Energy Transfer; Phycocyanin; ZnO
ID Code:101990
Deposited On:27 Jan 2017 17:32
Last Modified:27 Jan 2017 17:32

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