Universal Metal-Semiconductor Hybrid Nanostructured SERS Substrate for Biosensing
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- 作者：Soumik Siddhanta ; Varun Thakur ; Chandrabhas Narayana ; S. M. Shivaprasad
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：November 28, 2012
- 年：2012
- 卷：4
- 期：11
- 页码：5807-5812
- 全文大小：394K
- 年卷期：v.4,no.11(November 28, 2012)
- ISSN：1944-8252
文摘
We demonstrate here a novel high surface area GaN nanowall network substrate with plasmonic Ag nanodroplets, that can be employed as a highly sensitive, reproducible, and charge independent SERS substrate. The uniformity of the size and distribution of the Ag droplets and the absence of linker ligands result in large near-field intensity, while the GaN nanowall network morphology provides multiple reflections for signal enhancement. FDTD calculations simulate the observed hot-spot distribution and reiterate the higher performance of this hybrid substrate over conventional ones. Our studies on oppositely charged proteins provide a proof of concept for employing this as a versatile charge independent label free SERS substrate for trace biomolecule detection.