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 ob...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.展开更多
基金We thank Department of Science and Technology,Government of India for constantly supporting our research program on nanomaterials.
文摘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.
