Fabrication of Thorny Au Nanostructures on Polyaniline Surfaces for Sensitive Surface-Enhanced Raman Spectroscopy

详细信息    查看全文

• 作者：Siwei Li ; Ping Xu ; Ziqiu Ren ; Bin Zhang ; Yunchen Du ; Xijiang Han ; Nathan H. Mack ; Hsing-Lin Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：January 9, 2013
• 年：2013
• 卷：5
• 期：1
• 页码：49-54
• 全文大小：408K
• 年卷期：v.5,no.1(January 9, 2013)
• ISSN：1944-8252

文摘

Here we demonstrate, for the first time, the fabrication of Au nanostructures on polyaniline (PANI) membrane surfaces for surface enhanced Raman spectroscopy (SERS) applications, through a direct chemical reduction by PANI. Introduction of acids into the HAuCl₄ solution leads to homogeneous Au structures on the PANI surfaces, which show only sub-ppm detection levels toward the target analyte, 4-mercaptobenzoic acid (4-MBA), because of limited surface area and lack of surface roughness. Thorny Au nanostructures can be obtained through controlled reaction conditions and the addition of a capping agent poly (vinyl pyrrolidone) (PVP) in the HAuCl₄ solution and the temperature kept at 80 掳C in an oven. Those thorny Au nanostructures, with higher surface areas and unique geometric feature, show a SERS detection sensitivity of 1 脳 10^鈥? M (sub-ppb level) toward two different analyte molecules, 4-MBA and Rhodamine B, demonstrating their generality for SERS applications. These highly sensitive SERS-active substrates offer novel robust structures for trace detection of chemical and biological analytes.

Keywords:

surface enhanced Raman spectroscopy; gold; polyaniline; thorny nanostructures