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Unusual Stability and Catalytic Activity of Gold Nanoparticles in Polyoxyethylene Cholesteryl Ether

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We report a simple and spontaneous method for creation of extremely stable and catalytically active gold nanoparticles (AuNPs) from polyoxyethylene cholesteryl ether (ChEO15) and sodium tetrachloroaurate (III) dihydrate (Na[AuCl4] · 2H2O). AuNPs with uniform size and distribution were prepared at 27 °C (AuNPs were formed in <3 h) and at 50 °C (AuNPs were formed in <1 h). Our elucidations propose that creation of well-defined AuNPs is assisted by reductive ChEO15 surfactant solution via complexation and in-situ reduction of AuCl 4 ions in which ChEO15 acts both as a reducing and consequently a stabilizing (capping) moiety. AuNPs size can be altered by suitably choosing the Au precursor concentration. The resulting AuNPs reveal outstanding catalytic activity for conversion of nitrophenols to aminophenol in the presence of NaBH4 and also exhibit synthetic peroxidase-like activity. This simple yet effective synthesis technique opens prospect for creation of stable and active AuNPs.
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Keywords: Catalysis; Gold Nanoparticles; Peroxidase Activity; Polyoxyethylene Cholesteryl Ether; in-situ Reduction

Document Type: Research Article

Affiliations: 1: School of Engineering & Applied Science, Ahmedabad University, GICT Building, Central Campus, Navrangpura 380009, Ahmedabad, India 2: Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Central Campus, Navrangpura 380009, Ahmedabad, India

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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