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Structural and optical tunability of metallodielectric composites with gradual shell growth

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Abstract

Metallodielectric (gold@silica) composites were prepared by seed and grow method. The dielectric microspheres (core material) of an average size of 400 nm were synthesized by sol–gel method and gold nanoparticles (AuNPs) were prepared by reducing the chloroauric solution. Shell growth around silica (SiO2) microspheres was carried out in a multistep layer-by-layer process. The synthesized composites were characterized using techniques such as field emission-scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and UV–Visible (UV–Vis) spectroscopy. FE-SEM and FTIR analyses have confirmed the functionalization of SiO2 surfaces with the amine terminal group along with the gold shell growth. XRD analysis has given an average crystallite size of 12.3 nm for metallodielectric composites. Absorption spectra have demonstrated the dependence of surface plasmon resonance (SPR) peak on the successive shell growth by exhibiting a red shift.

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Acknowledgements

The authors (A Sharma and N K Dhiman) are thankful to National Institute of Technology, Hamirpur (HP), India for providing financial assistance. Useful comments suggested by reviewer are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology, Hamirpur, 177 005, India

    ANKITA SHARMA, NARESH DHIMAN & ARVIND K GATHANIA

  2. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India

    B P SINGH

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  1. ANKITA SHARMA
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  2. NARESH DHIMAN
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  3. B P SINGH
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  4. ARVIND K GATHANIA
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Correspondence to ARVIND K GATHANIA.

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SHARMA, A., DHIMAN, N., SINGH, B.P. et al. Structural and optical tunability of metallodielectric composites with gradual shell growth. Pramana - J Phys 86, 147–155 (2016). https://doi.org/10.1007/s12043-015-0988-6

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  • DOI: https://doi.org/10.1007/s12043-015-0988-6

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