We report a rapid and facile method to synthesize highly monodispersed silver nanoparticles (AgNP) by heteroepitaxial growth method using gold seed particles (size ~2&nbsp;nm). Silver was deposited on gold seed particles by Tollen’s reaction. The presence of seed particles provided good control on the morphology and size distribution of AgNP, achieving the standard deviation in size ≤11&nbsp;%. The real-time kinetics of AgNP formation revealed that the presence of gold seed particles increased the reaction rate by 7-fold compared to seedless approach. The size and extinction maxima of AgNP were tunable by varying the gold seed particles to silver molar ratio. This new heteroepitaxial growth method of AgNP synthesis is simple, fast (completing the reaction within 3&nbsp;min), and eco-friendly to yield monodispersed nanoparticles. Further, these AgNP were used to develop efficient surface-enhanced Raman scattering (SERS) substrates for sensing applications which showed good repeatability and significantly improved enhancement factors in the near-infrared (NIR) region. © 2014, Springer Science+Business Media New York.

Jitendra Satija

Centre for Nanobiotechnology

Vellore Campus

Joseph Tharion

Tharion J

Soumyo Mukherji

Satija J

Mukherji S.

Heteroepitaxial growth

Localized surface plasmon resonance

sensor

Silver nanoparticles

Surface-enhanced Raman scattering

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Plasmonics

Convergence of localized surface plasmon resonance of metal nanoparticles with classical ELISA has emerged as a new class of immunoassays, i.e. plasmonic ELISA, enabling biocatalysis mediated ultrasensitive naked-eye detection of disease biomarkers.

RSC Advances

Plasmonic-ELISA: Expanding horizons

Fulltext

Applied Nanoscience

Dual mechanism-based sensing of mercury using unmodified, heteroepitaxially synthesized silver nanoparticles

Vibrational Spectroscopy

Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

In this paper, we report a novel, eco-friendly method for the preparation of gold nanoshells (GNS) with unprecedented colloidal stability. Gold shell layers were grown on silica nanospheres by utilizing glucose. Nanoshell morphology was optimized by varying the molar ratio of glucose to gold, and was characterized using UV-vis spectroscopy and transmission electron microscopy (TEM). The colloidal stability of the prepared nanoshells was compared to those made using formaldehyde reductant, using sequential extinction intensity measurements and electron microscopy. Fourier transform infrared spectroscopy was used to elucidate their surface chemistry. Uniformity and homogeneity in the shells was achieved at a molar ratio of 2, followed by shell thinning at higher glucose concentrations. These colloids exhibited remarkable stability, compared to those prepared with the commonly reported protocol, where formaldehyde is employed as the reducing agent. The key role played by glucose in imparting high stability, in conjunction with its reducing properties is demonstrated. Furthermore, the sensing potential of these nanoshells was demonstrated using surface enhanced Raman scattering (SERS) in the near-infrared region on an optical fiber platform. The present approach offers an eco-friendly route for the production of nanoshells with high stability, augmenting their use for sensing and in vivo applications, where highly stable and unaggregated nanoshells are preferred. By eliminating the routinely used noxious formaldehyde, this method presents itself as a safe, scalable and direct route for the synthesis of glucose capped nanoshells, which are much sought after for therapeutic applications. © 2013 The Royal Society of Chemistry.

Glucose mediated synthesis of gold nanoshells: A facile and eco-friendly approach conferring high colloidal stability

The Analyst

Innovative fabrication of a Au nanoparticle-decorated SiO2 mask and its activity on surface-enhanced Raman scattering

Nano Letters

Ordered Ag/Si Nanowires Array: Wide-Range Surface-Enhanced Raman Spectroscopy for Reproducible Biomolecule Detection

Advances in Natural Sciences: Nanoscience and Nanotechnology

Silver nanoparticles: synthesis, properties, toxicology, applications and perspectives

Facile Synthesis of Size-Tunable Silver Nanoparticles by Heteroepitaxial Growth Method for Efficient NIR SERS

Journal	Data powered by TypesetPlasmonics
Publisher	Data powered by TypesetSpringer New York LLC
ISSN	15571955
Open Access	No