| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7791927 | Carbohydrate Polymers | 2014 | 7 Pages |
Abstract
Gold and silver-gold alloy nanoparticles with mean diameter of 10Â nm 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 551Â nm respectively; while for the bimetallic Ag-Au alloy appeared 520Â nm in between them. TEM images showed monodispersed particles in the range of 8-10Â nm. 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.
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Authors
Kalipada Bankura, Dipanwita Maity, Md. Masud Rahaman Mollick, Dibyendu Mondal, Biplab Bhowmick, Indranil Roy, Tarapada Midya, Joy Sarkar, Dipak Rana, Krishnendu Acharya, Dipankar Chattopadhyay,