Journal
CARBOHYDRATE RESEARCH
Volume 357, Issue -, Pages 90-97Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2012.04.012
Keywords
Green synthesis; Soluble starch; Acid hydrolysis; Alkaline degradation; Platinum nanoparticles
Funding
- Thailand Research Fund under The Royal Golden Jubilee Ph.D. Program (TRF-RGJ)
- National Research Council of Thailand (NRCT)
- Center of Innovative Nanotechnology, Chulalongkorn University (CIN-CU)
- National Center of Excellence for Petroleum, Petrochemicals and Advanced Materials (NCE-PPAM)
- Commission on Higher Education (CHE)
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In this work, the efficiency of soluble starch as a reducing and a stabilizing agent in the synthesis of platinum nanoparticles under acidic-alkaline treatment is systematically studied. The degraded intermediates with reducing potential (i.e., small molecules containing aldehyde and alpha-hydroxy ketone moieties) are concomitantly generated when the alkaline concentration is greater than 0.025 M. The in situ generated species could completely reduce platinum ions (20 mM) and sufficiently stabilize the obtained platinum nanoparticles (5 mM) of uniform particle size (2-4 nm). The reduction is efficient and rapid as a complete conversion is achieved within 5 min. In a stronger alkaline condition, the platinum nanoparticles tend to aggregate and form a bigger domain because extensive degradation generates small starch fragments with less stabilization efficiency. This observation suggests that starch is a promising green material which could be chemically treated and transformed to a powerful reducing agent and stabilizer for the synthesis of metal nanoparticles. (C) 2012 Elsevier Ltd. All rights reserved.
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