Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 445, Issue -, Pages 76-83Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.12.064
Keywords
Mono- and bimetallic nanoparticles; Orientation; Zeta-potential; Fluorescence quenching
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Funding
- BITS research initiation Grant
- UGC-BSR research Start-up-Grant [F.20-1(21)/2012(BSR)]
- University Grants Commission (UGC) special assistance program, Department of Science and Technology (DST) FIST program, Government of India [F.540/14/DRS/2007 (SAP-I)]
- Aditya Birla Groups
- CSIR
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In the present study, we report the synthesis of gold (Au), silver (Ag), and gold-silver alloy (Au-Ag) nanoparticles (NPs) by seed-mediated method using gemini surfactant, containing diethyl ether spacer group as a stabilizer. As-synthesized NPs are found very much stable and have been characterized using UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and zeta potential techniques. The orientation of gemini surfactant molecules surrounding the metal NPs has been investigated exploiting twisted intramolecular charge transfer (TICT) fluorescence properties of a probe 4-(N,N-dimethylamino) cinnamaldehyde (DMACA). The quenching efficiencies of different NPs have been performed in the fluorescence of DMACA and are found to be different. This effect can be related to the location of DMACA as well as the electro-negativity of the metals as the extent of orientation of the surfactant molecules around NPs controls the location of DMACA in a bilayer. To support the location of DMACA, fluorescence quenching studies with cetylpyridinium chloride (CPC) as an external quencher have also been carried out. (C) 2014 Elsevier Inc. All rights reserved.
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