阳极氧化铝薄膜表面增强拉曼光谱

Surface enhanced Raman with anodized aluminum oxide films.

作者信息

Zhang C, Abdijalilov K, Grebel H

机构信息

Electronic Imaging Center at NJIT, Newark, New Jersey 07102, USA.

出版信息

J Chem Phys. 2007 Jul 28;127(4):044701. doi: 10.1063/1.2752498.

DOI:10.1063/1.2752498

PMID:17672711

Abstract

Aluminum is not a platform of choice for surface enhanced Raman scattering (SERS) experiments despite its large negative permittivity value (larger than gold or silver at optical wavelengths). It is also widely believed that an oxide layer on top of any platform substantially impedes SERS signals. Yet, anodized aluminum oxide may be perforated in an organized fashion and we have used it to examine SERS of single walled carbon nanotubes (SWCNTs) at micron length and fullerene (C60) at the nanoscale. The signal-to-noise ratio of the corresponding Raman signals exhibited a large signal enhancement for SWCNTs but not for C60. We attributed the SERS to the formation of standing surface charge waves in this subwavelength environment.

摘要

尽管铝在光学波长下具有很大的负介电常数（比金或银大），但它并非表面增强拉曼散射（SERS）实验的首选平台。人们还普遍认为，任何平台表面的氧化层都会严重阻碍SERS信号。然而，阳极氧化铝可以有组织地穿孔，我们利用它来研究微米长度的单壁碳纳米管（SWCNT）和纳米级富勒烯（C60）的SERS。相应拉曼信号的信噪比显示，SWCNT的拉曼信号有很大增强，而C60则没有。我们将这种SERS归因于在这种亚波长环境中形成的驻表面电荷波。