Ordered Array of Gold Semishells on TiO2 Spheres: An Ultrasensitive and Recyclable SERS Substrate
详细信息 查看全文
- 作者：Xianglin Li ; Hailong Hu ; Dehui Li ; Zexiang Shen ; Qihua Xiong ; Shuzhou Li ; Hong Jin Fan
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：April 25, 2012
- 年：2012
- 卷：4
- 期：4
- 页码：2180-2185
- 全文大小：419K
- 年卷期：v.4,no.4(April 25, 2012)
- ISSN：1944-8252
文摘
Ordered array of Au semishells on TiO2 spheres with controlled size are prepared by combining the nanosphere self-assembly and atomic layer deposition (ALD). This ordered 2-D structure with designed array of metal nanogaps can be used as an ultrasensitive surface-enhanced Raman scattering (SERS) substrate with high reproducibility and stability. More importantly, the SERS substrates are recyclable, as enabled by their self-cleaning function due to the TiO2 photocatalytic degradation of the target molecules. The high SERS sensitivity and recyclability are demonstrated by the detection of Rhodamine 6G (R6G) and brilliant cresyl blue (BCB) molecules. As both the nanosphere lithography and ALD are scalable processes, such 2-D ordered substrates may find applications in chemical sensing.