Size-dependent surface plasmon resonance in silver silica nanocomposites

Senoy Thomas; Saritha K. Nair; E. Muhammad Abdul Jamal; S. H. Al-Harthi; Manoj Raama Varma; M. R. Anantharaman

doi:10.1088/0957-4484/19/7/075710

Size-dependent surface plasmon resonance in silver silica nanocomposites

Senoy Thomas, Saritha K. Nair, E. Muhammad Abdul Jamal, S. H. Al-Harthi, Manoj Raama Varma, M. R. Anantharaman^*

^*Corresponding author for this work

Physics

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

117 Citations (Scopus)

Abstract

Silver silica nanocomposites were obtained by the sol-gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO₃) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by x-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopic (XPS) studies were done for determining the chemical states of silver in the silica matrix. For the lowest AgNO₃ concentration, monodispersed and spherical Ag crystallites, with an average diameter of 5 nm, were obtained. Grain growth and an increase in size distribution was observed for higher concentrations. The occurrence of surface plasmon resonance (SPR) bands and their evolution in the size range 5-10 nm is studied. For decreasing nanoparticle size, a redshift and broadening of the plasmon-related absorption peak was observed. The observed redshift and broadening of the SPR band was explained using modified Mie scattering theory.

Original language	English
Article number	075710
Journal	Nanotechnology
Volume	19
Issue number	7
DOIs	https://doi.org/10.1088/0957-4484/19/7/075710
Publication status	Published - 2008

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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title = "Size-dependent surface plasmon resonance in silver silica nanocomposites",

abstract = "Silver silica nanocomposites were obtained by the sol-gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO3) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by x-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopic (XPS) studies were done for determining the chemical states of silver in the silica matrix. For the lowest AgNO3 concentration, monodispersed and spherical Ag crystallites, with an average diameter of 5 nm, were obtained. Grain growth and an increase in size distribution was observed for higher concentrations. The occurrence of surface plasmon resonance (SPR) bands and their evolution in the size range 5-10 nm is studied. For decreasing nanoparticle size, a redshift and broadening of the plasmon-related absorption peak was observed. The observed redshift and broadening of the SPR band was explained using modified Mie scattering theory.",

author = "Senoy Thomas and Nair, {Saritha K.} and Jamal, {E. Muhammad Abdul} and Al-Harthi, {S. H.} and Varma, {Manoj Raama} and Anantharaman, {M. R.}",

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AU - Thomas, Senoy

AU - Nair, Saritha K.

AU - Jamal, E. Muhammad Abdul

AU - Al-Harthi, S. H.

AU - Varma, Manoj Raama

AU - Anantharaman, M. R.

PY - 2008

Y1 - 2008

N2 - Silver silica nanocomposites were obtained by the sol-gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO3) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by x-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopic (XPS) studies were done for determining the chemical states of silver in the silica matrix. For the lowest AgNO3 concentration, monodispersed and spherical Ag crystallites, with an average diameter of 5 nm, were obtained. Grain growth and an increase in size distribution was observed for higher concentrations. The occurrence of surface plasmon resonance (SPR) bands and their evolution in the size range 5-10 nm is studied. For decreasing nanoparticle size, a redshift and broadening of the plasmon-related absorption peak was observed. The observed redshift and broadening of the SPR band was explained using modified Mie scattering theory.

AB - Silver silica nanocomposites were obtained by the sol-gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO3) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by x-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopic (XPS) studies were done for determining the chemical states of silver in the silica matrix. For the lowest AgNO3 concentration, monodispersed and spherical Ag crystallites, with an average diameter of 5 nm, were obtained. Grain growth and an increase in size distribution was observed for higher concentrations. The occurrence of surface plasmon resonance (SPR) bands and their evolution in the size range 5-10 nm is studied. For decreasing nanoparticle size, a redshift and broadening of the plasmon-related absorption peak was observed. The observed redshift and broadening of the SPR band was explained using modified Mie scattering theory.

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Size-dependent surface plasmon resonance in silver silica nanocomposites

Abstract

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