Pettinger Bruno, Ren Bin, Picardi Gennaro, Schuster Rolf, Ertl Gerhard
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
Phys Rev Lett. 2004 Mar 5;92(9):096101. doi: 10.1103/PhysRevLett.92.096101. Epub 2004 Mar 2.
Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN- ions at Au(111) and malachite green isothiocyanate (MGITC) molecules at Au(111) and Pt(110) using either Au or Ir tips. The data analysis yields Raman enhancements of about 4 x 10(5) for CN- and up to 10(6) for MGITC at Au(111) with a Au tip, probing an area of less than 100 nm radius.
针尖增强拉曼光谱（TERS）基于针尖 - 基底腔中局域表面等离子体的光激发，这在针尖顶端附近提供了大幅但局部的场增强。我们报道了以光滑单晶表面为基底的TERS。使用金或铱针尖时，吸附质分别为金（111）表面的氰根离子以及金（111）和铂（110）表面的异硫氰酸孔雀石绿（MGITC）分子。数据分析得出，使用金针尖探测半径小于100纳米的区域时，对于金（111）表面的氰根离子，拉曼增强约为4×10⁵，对于MGITC则高达10⁶。
