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Home > News > So, near and yet so far: Stable HGNs for Raman

April 1st, 2015

So, near and yet so far: Stable HGNs for Raman

Abstract:
Researchers have found a way to stabilise hollow gold nanospheres (HGNs) so that their unique combination of properties can be utilised as nanotags more widely in Surface Enhanced Raman Spectroscopy (SERS) for biomedical applications.

Samantha Moreton, Karen Faulds and Duncan Graham of the University of Strathclyde, Glasgow, Neil Shand of the Defence Science and Technology Laboratory (DSTL) Porton Down, Salisbury, Wiltshire, UK and Matthew Bedics and Michael Detty of the University at Buffalo, The State University of New York, USA, suggest that HGNs with their thin gold shell and hollow interior are unique nanostructures. They exhibit surface plasmon resonance because the valence electrons will oscillate collectively if an electric field is applied. This phenomenon depends sensitively on the size and shape of the nanoparticles as well as their homogeneity and can be followed using extinction spectroscopy, the team reports in the Royal Society of Chemistry journal Nanoscale. Moreover, careful preparation of HGNs allows the SPR to be tuned to near-infrared wavelengths, viz. from 550 to 1320 nanometres.

Source:
spectroscopynow.com

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