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Journal of Nanoparticle Research

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01-08-2012 | Brief Communication

Green synthesis and characterization of size tunable silica-capped gold core–shell nanoparticles

Authors: Nishima Wangoo, Gajendra Shekhawat, Jin-Song Wu, Aman K. K. Bhasin, C. R. Suri, K. K. Bhasin, Vinayak Dravid

Published in: Journal of Nanoparticle Research | Issue 8/2012

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Abstract

Silica-coated gold nanoparticles (Au@SiO₂) with controlled silica-shell thickness were prepared by a modified Stober’s method using 10-nm gold nanoparticles (AuNPs) as seeds. The AuNPs were silica-coated with a sol–gel reaction using tetraethylorthosilicate (TEOS) as a silica source and ammonia as a catalyst. An increase in TEOS concentration resulted in an increase in shell thickness. The NPs were characterized by transmission electron microscopy, selected area electron diffraction, energy-dispersive X-ray spectroscopy, scanning near-field ultrasound holography and scanning transmission electron microscopy. The method required no surface modification and the synthesized core shell nanoparticles can be used for various types of biological applications.

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Title: Green synthesis and characterization of size tunable silica-capped gold core–shell nanoparticles
Authors: Nishima Wangoo
Gajendra Shekhawat
Jin-Song Wu
Aman K. K. Bhasin
C. R. Suri
K. K. Bhasin
Vinayak Dravid
Publication date: 01-08-2012
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 8/2012
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-012-1011-5

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