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

Sajanlal, Panikkanvalappil Ravindranathan and Pradeep, Thalappil (2009) Mesoflowers: A new class of highly efficient surface-enhanced Raman active and infrared-absorbing materials. Nano Research, 2 (4). pp. 306-320.

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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.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
ID Code:5116
Deposited By:CSMNT
Deposited On:17 Aug 2010 15:07
Last Modified:25 Aug 2010 10:48

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