NDLI: A study into the role of surface capping on energy transfer in metal cluster

Content Provider	Royal Society of Chemistry (RSC)
Author	Sadhu, Suparna Paramanik, Bipattaran Bain, Dipankar Patra, Amitava
Copyright Year	2015
Abstract	Metal cluster–semiconductor nanocomposite materials remain a frontier area of research for the development of optoelectronic, photovoltaic and light harvesting devices because metal nanoclusters and semiconductor QDs are promising candidates for photon harvesting. Here, we have designed well defined metal cluster–semiconductor nanostructures using different surface capped negatively charged Au25 nanoclusters (Au NCs) and positively charged cysteamine capped CdTe quantum dots using electrostatic interactions. The main focus of this article is to address the impact of surface capping agents on the photophysical properties of Au cluster–CdTe QD hybrid nanocomposites. Steady state and time resolved spectroscopic studies reveal that photoluminescence quenching, radiative and nonradiative rate, and energy transfer between Au nanoclusters and CdTe QDs have been influenced by the nature of the capping agent. We have calculated the energy transfer related parameters such as the overlap integral, distance between donor and acceptor, Förster distance, efficiency of energy transfer and rate of energy transfer from CdTe QDs to three different Au NCs. Photoluminescence quenching varies from 73% to 43% when changing the capping agents from bovine serum albumin (BSA) to glutathione (GSH). The efficiency of the energy transfer from CdTe QDs to BSA-capped Au NCs is found to be 83%, for Cys-capped Au NCs it was 46% and for GSH-capped Au NCs it was 35%. The efficiency depends on the number of Au clusters attached per QD. This reveals that the nature of capping ligands plays a crucial role in the energy transfer phenomena from CdTe QDs to Au NCs. Interesting findings reveal that the efficient energy transfer in metal cluster–semiconductor nanocomposites may open up new possibilities in designing artificial light harvesting systems for future applications.
Starting Page	20697
Ending Page	20708
Page Count	12
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	48
Journal	Nanoscale
DOI	10.1039/c5nr06793f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Solar cell BSA Quantum Bovine serum albumin Optoelectronics Semiconductor Photoluminescence Cysteamine Integral Nanocomposite Photon Glutathione
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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