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

Nishima Wangoo; Gajendra Shekhawat; Jin Song Wu; Aman K K Bhasin; C. R. Suri; K. K. Bhasin; Vinayak Dravid

doi:10.1007/s11051-012-1011-5

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

Nishima Wangoo^*, Gajendra Shekhawat, Jin Song Wu, Aman K K Bhasin, C. R. Suri, K. K. Bhasin, Vinayak Dravid

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Silica-coated gold nanoparticles (AuSiO₂) 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.

Original language	English (US)
Article number	1011
Journal	Journal of Nanoparticle Research
Volume	14
Issue number	8
DOIs	https://doi.org/10.1007/s11051-012-1011-5
State	Published - Aug 2012

Funding

Senior Research fellowship to Nishima Wangoo. This study was supported by grants from the National Science Foundation Award Number OISE 0352706 and ECCS-0330410. TEM, EDS, STEM and SNFUH imaging were performed in the EPIC and NIFTI facility of NUANCE center at Northwestern University, which is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois and Northwestern University. Acknowledgments Council of Scientific and Industrial Research (CSIR), India, is gratefully acknowledged for the

Keywords

Amino acid
Core shell
Gold nanoparticles
Silica
Sol-gel

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Bioengineering
Atomic and Molecular Physics, and Optics
General Materials Science
Modeling and Simulation

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10.1007/s11051-012-1011-5

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title = "Green synthesis and characterization of size tunable silica-capped gold core-shell nanoparticles",

abstract = "Silica-coated gold nanoparticles (AuSiO2) 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.",

keywords = "Amino acid, Core shell, Gold nanoparticles, Silica, Sol-gel",

author = "Nishima Wangoo and Gajendra Shekhawat and Wu, {Jin Song} and Bhasin, {Aman K K} and Suri, {C. R.} and Bhasin, {K. K.} and Vinayak Dravid",

note = "Funding Information: Senior Research fellowship to Nishima Wangoo. This study was supported by grants from the National Science Foundation Award Number OISE 0352706 and ECCS-0330410. TEM, EDS, STEM and SNFUH imaging were performed in the EPIC and NIFTI facility of NUANCE center at Northwestern University, which is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois and Northwestern University. Funding Information: Acknowledgments Council of Scientific and Industrial Research (CSIR), India, is gratefully acknowledged for the",

year = "2012",

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doi = "10.1007/s11051-012-1011-5",

language = "English (US)",

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AU - Suri, C. R.

AU - Bhasin, K. K.

AU - Dravid, Vinayak

N1 - Funding Information: Senior Research fellowship to Nishima Wangoo. This study was supported by grants from the National Science Foundation Award Number OISE 0352706 and ECCS-0330410. TEM, EDS, STEM and SNFUH imaging were performed in the EPIC and NIFTI facility of NUANCE center at Northwestern University, which is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois and Northwestern University. Funding Information: Acknowledgments Council of Scientific and Industrial Research (CSIR), India, is gratefully acknowledged for the

PY - 2012/8

Y1 - 2012/8

N2 - Silica-coated gold nanoparticles (AuSiO2) 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.

AB - Silica-coated gold nanoparticles (AuSiO2) 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.

KW - Amino acid

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

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