| Literature DB >> 24702930 |
Kalipada Bankura1, Dipanwita Maity2, Md Masud Rahaman Mollick2, Dibyendu Mondal2, Biplab Bhowmick2, Indranil Roy2, Tarapada Midya2, Joy Sarkar3, Dipak Rana4, Krishnendu Acharya3, Dipankar Chattopadhyay5.
Abstract
Gold and silver-gold alloy nanoparticles with mean diameter of 10nm and narrow size distribution were prepared by reduction of the correspondent metal precursors using aqueous dextran solution which acts as both a reducing and capping agent. The formation of nanoparticles was characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and dynamic light scattering (DLS). The silver and gold nanoparticles exhibited absorption maxima at 425 and 551 nm respectively; while for the bimetallic Ag-Au alloy appeared 520 nm in between them. TEM images showed monodispersed particles in the range of 8-10nm. The crystallinity of the nanoparticles was assured by XRD analysis. DLS data gave particle size distribution. The dextran stabilized Au nanoparticles used as a colorimetric sensor for detection and estimation of pesticide present in water. The dextran stabilized Ag-Au alloy nanoparticles exhibited interesting antimicrobial activity against bacteria at micromolar concentrations.Entities:
Keywords: Ag–Au alloy; Antimicrobial activity; Colorimetric sensor; Dextran stabilized nanoparticles; Nanoparticles
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Year: 2014 PMID： 24702930 DOI： 10.1016/j.carbpol.2014.02.047
Source DB: PubMed Journal: Carbohydr Polym ISSN： 0144-8617 Impact factor: 9.381