Research Article

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2009, 2: 306-320

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https://doi.org/10.1007/s12274-009-9028-5

Mesoflowers: A New Class of Highly Effi cient Surface-Enhanced Raman Active and Infrared-Absorbing Materials

Panikkanvalappil Ravindranathan Sajanlal and Thalappil Pradeep()

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Technology Madras, Chennai 600 036, India

Keywords: Mesoflowers, gold nanoparticles, seed-mediated growth, IR absorption, surface-enhanced Raman scattering (SERS)
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  • Abstract
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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 mesofl owers 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 mesofl owers on their conditions of formation was studied. The near-infrared infrared (NIR IR) absorption exhibited by the mesofl owers has been used for the development of infrared fi lters. Using a prototypical device, we demonstrated the utility of the gold mesofl owers 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 mesofl ower is demonstrated. The high SERS activity and NIR IR absorption property open up a number of exciting applications in diverse areas.
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Mesoflowers: A New Class of Highly Effi cient Surface-Enhanced Raman Active and Infrared-Absorbing Materials. Nano Res. 2009, 2: 306-320 https://doi.org/10.1007/s12274-009-9028-5

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