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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 236448.0, Fritz-Haber-Institut / Physical Chemistry
Tip-enhanced Raman spectroscopy (TERS) of malachite green isothiocyanate at Au(111): bleaching behavior under the influence of high electromagnetic fields
Authors:Pettinger, Bruno; Ren, Bin; Picardi, Gennaro; Schuster, Rolf; Ertl, Gerhard
Date of Publication (YYYY-MM-DD):2005-07-04
Title of Journal:Journal of Raman Spectroscopy
Journal Abbrev.:J. Raman Spectrosc.
Issue / Number:6-7
Start Page:541
End Page:550
Title of Issue:Surface enhanced Raman spectroscopy
Full name of Issue-Editor(s):Zhong-Qun Tian
Copyright:© 2005 John Wiley & Sons, Ltd.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The tip-enhanced Raman spectroscopy (TERS) was investigated with malachite green isothiocyanate adsorbed at an Au(111) surface. TERS is based on the excitation of localized surface plasmons in the tip apex, producing strongly enhanced electromagnetic fields. The key conditions for giant TERS are side-illumination of the tip, well-prepared single-crystalline surfaces and sharp, smooth gold-tips. A TERS enhancement of about 6 x 106 has been observed for dye molecules adsorbed at the Au(111) substrate in a region of about 50 nm diameter beneath the tip. This corresponds to a 2500-fold increase in the light intensity at the Au(111)/air interface, which in addition causes a fast but local bleaching of the dye. This bleaching behavior was analyzed in detail, giving direct insight into the strength and size of the enhanced field. In addition, the bleaching constant was higher for MGITC in an unperturbed environment than for MGITC in an environment that had been substantially bleached. The MGITC spectra are also different for these two cases.
Free Keywords:apertureless scanning near-field optical microscopy; gold(111); tip-enhanced Raman spectroscopy; malachite green isothiocyanate; near-field enhancement
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Ren B, State Key Laboratory for Physical Chemistry of Solid Surfaces and Dept. of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China; Picardi G, Biophysics & Nanoscience Centre, INFM Dipto. di Scienze Ambientali Università della Tuscia, I-01100 Viterbo, Italy; Schuster R, Inst. of Inorganic and Physical Chemistry, Technical University of Darmstadt, D-64287 Darmstadt, Germany
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