Nano Research

, Volume 2, Issue 4, pp 306–320

Mesoflowers: A new class of highly efficient surface-enhanced Raman active and infrared-absorbing materials

Authors

  • Panikkanvalappil Ravindranathan Sajanlal
    • DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument FacilityIndian Institute of Technology Madras
    • DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument FacilityIndian Institute of Technology Madras
Open AccessResearch Article

DOI: 10.1007/s12274-009-9028-5

Cite this article as:
Sajanlal, P.R. & Pradeep, T. Nano Res. (2009) 2: 306. doi:10.1007/s12274-009-9028-5

Abstract

A method for the synthesis of a new class of anisotropic mesostructured gold material, which we call “mesoflowers”, is demonstrated. The mesoflowers, unsymmetrical at the single particle level, resemble several natural objects and are made up of a large number of stems with unusual pentagonal symmetry. The mesostructured material has a high degree of structural purity with star-shaped, nano-structured stems. The mesoflowers were obtained in high yield, without any contaminating structures and their size could be tuned from nano- to meso-dimensions. The dependence of various properties of the mesoflowers on their conditions of formation was studied. The near-infrared-infrared (NIR-IR) absorption exhibited by the mesoflowers has been used for the development of infrared filters. Using a prototypical device, we demonstrated the utility of the gold mesoflowers in reducing the temperature rise in an enclosure exposed to daylight in peak summer. These structures showed a high degree of surface-enhanced Raman scattering (SERS) activity compared to spherical analogues. SERS-based imaging of a single mesoflower is demonstrated. The high SERS activity and NIR-IR absorption property open up a number of exciting applications in diverse areas.

Keywords

Mesoflowersgold nanoparticlesseed-mediated growthIR absorptionsurface-enhanced Raman scattering (SERS)
Download to read the full article text

Supplementary material

12274_2009_9028_MOESM1_ESM.pdf (1.6 mb)
Supplementary material, approximately 1.57 MB.

Copyright information

© Tsinghua University Press and Springer-Verlag GmbH 2009