Templated fabrication of metal half-shells for surface-enhanced Raman scattering

Physical Chemistry Chemical Physics : PCCP
Xuefeng LiuPeng Jiang

Abstract

Here we report a scalable colloidal templating approach for producing metal half-shells as efficient surface-enhanced Raman scattering (SERS) substrates. Nonclose-packed monolayer colloidal crystals created by a spin-coating technology are used as structural template to fabricate both water-dispersed half-shells and disordered arrays of half-shells with preferential upright orientation. The sharp edges of the half-shells and the small gaps between adjacent shells can significantly enhance the local electromagnetic field, resulting in high SERS enhancement factor (up to 10(10)) which is nearly 2 orders of magnitude higher than those of periodic substrates produced by other colloidal templating approaches. We have also demonstrated that the thickness of the half-shells determines the surface plasmon resonance and the resulting SERS enhancement. Counterintuitively, the disordered arrays of oriented half-shells show reproducible enhancement with a standard deviation of less than 20%. This new bottom-up approach enables the large-scale production of SERS substrates that are at least 2 orders of magnitude larger in area than those made by other colloidal lithography technologies. The resulting substrates with high and reproducible SE...Continue Reading

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Citations

Dec 17, 2011·ACS Applied Materials & Interfaces·Guangqiang LiuWeiping Cai
May 24, 2013·Nanoscale Research Letters·Mikhail Yu TsvetkovNikolai G Khlebtsov
Sep 22, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Hengchao ZhangShuit-Tong Lee
Feb 19, 2011·Physical Chemistry Chemical Physics : PCCP·Anna Iwaszuk, Michael Nolan
Mar 2, 2011·Advanced Materials·Hua BaiGaoquan Shi
Apr 10, 2014·The Journal of Physical Chemistry. B·T J SimonsM Forsyth
Jun 25, 2013·Physical Chemistry Chemical Physics : PCCP·Xuan DouPeng Jiang

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