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TP27

Code: TP27	Time Slot/Poster Number: 082	Session: Raman at interfaces
Surface-Enhanced Raman Scattering Excited by Propagating Surface Plasmons
Weiqing Xu; Yu Liu; Shuping Xu
State Key Laboratory of Supramolecular Structure a, Changchun, China

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Summary
SERS spectra excited by propagating surface plasmons on a smooth sliver film surface was achieved by a novel SPR-SERS microspectrometer. The maximal SERS signals were observed at the vicinity of SPR angle. The correlation of SPR and SERS provides a direct evidence for SPR enhancement mode. The SPR-SERS spectroscopy presents a potential technique for multi-mode ultrasensitive detection.

Code: TP27	Time Slot/Poster Number: 083	Session: Raman at interfaces
Propagating and Localized Surface Plasmons Coenhanced Raman Scattering of 4-Mercaptopyridine
Shuping Xu; Yu Liu; Weiqing Xu
State Key Laboratory of Supramolecular Structure a, Changchun, China

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Summary
Surface enhanced Raman scattering (SERS) on a smooth surface of a metal film is usually too low to be detectable. The optimization of incident angles can effectively couple the propagating surface plasmons (SPs) of a smooth metal film to obtain better SERS signals of analytes. In this work, we used metal nanoparticles to assist the propagating SPs excited Raman scattering of 4-mercaptopyridine (4-Mpy) to acquire stronger SERS.

Code: TP27	Time Slot/Poster Number: 084	Session: Raman at interfaces
Water Gradients in Dentin/Adhesive Interface by Confocal Raman Microscopy
Xinglin Guo; Xiaomei Yao; Paulette Spencer; Yong Wang
University of Missouri Kansas City, Kansas City, MO

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Summary
It would be very desirable if water content in the demineralized dentin substrates could be measured in situ under in vivo conditions. However, there has been no method available to determine the water gradient/content in the dentin/adhesive interface. By using confocal Raman microscopy (CRM) in combination with the z-mapping technique, we were able to measure the chemical profile of the interface under its natural wet state. In this study, quantitative depth profilings of water content and other components in the dentin/adhesive interface were studied for the first time using CRM.

Code: TP27	Time Slot/Poster Number: 085	Session: Raman at interfaces
Micro-Raman Studies on the Kinetics of the Exchange between H2O and D2O in Mass Transfer-limited MgSO4 Droplets
Yun-Hong Zhang
Beijing Inst technol, Beijing, China

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Summary
In this topic, we reveal the kinetics of the exchange between H2O and D2O in mass transfer-limited MgSO4 droplets. Single droplets of MgSO4 (10-100 microns in diameter) were dissolved in D2O and deposited onto Teflon substrate. The relative humidity (RH) in the sample chamber was adjusted by changing the flux ratio of dry N2 to water saturated N2. The peak aera between V(O-H) and V(D-H) was used to detect the composition change on the surface and the centre of the droplets.

Code: TP27	Time Slot/Poster Number: 086	Session: Raman at interfaces
SERS of Inosine from Silver Nano Particles
Uttam Kumar Sarkar
Malda College, Malda 732 101, West Bengal, INDIA, Malda, India

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Summary
SERS of Inosine adsorbed in Ag-sol is studied. The in-plane base ring breathing mode appears at 715 cm-1 in solid phase. Appearance of this band at 736 cm-1 in the adsorbed state suggests C(2’) endo-anti conformation at concentrations upto 5x10-7M. However, this band disappears if the concentration is further lowered suggesting C(3’) endo-anti conformation. Metal-molecule interaction is the through N(7) atom as well as through the hydroxyl group attached to the C(5’). Monomolecular layer is formed at concentrations of 5x10-7M and 5x10-10M indicating perpendicular and parallel adsorption respectively. Time evolution of SERS shows dynamic orientation on the surface.

Code: TP27	Time Slot/Poster Number: 087	Session: Raman at interfaces
A Theoretical Study of Raman Spectra and Structures of Ionic Water Clusters
Ran Pang; De-Yin Wu; Zhong-Qun Tian
State Key Laboratory of Physical Chemistry of Soli, Xiamen, China

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Summary
In this report, Density Functional Theory (DFT) calculations at the B3LYP/Aug-cc-pVTZ level were carried out the two different water clusters, protonated water clusters H+(H2O)n and hydroxide water clusters OH-(H2O)n to predict and analyze the relationship between water clusters and vibrational Raman spectra. We can summarize our calculated results as follows. (1) The different kinds of clusters all have their own characteristic structures as center units. (2) The hydroxide water clusters of OH-(H2O)n have some specific features in structures and their Raman spectra.

Code: TP27	Time Slot/Poster Number: 088	Session: Raman at interfaces
SERS investigation of Metal/Organic Interface Formation: The Case Pentacene/Ag
Beynor Antonio Paez-Sierra¹; Luis A. Mancera²
¹QUBITON Laboratories, Linz, Austria; ²Group Theory in SFB 569, University of Ulm, Ulm, Germany

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Summary
We discuss on the interface formation between the organic semiconductor pentacene and silver as the top electrode. Pentacene is commonly used as active layer in organic field-effect transistors (OFETs). Especially in OFETs, a significant percentage of the drain current is realized at organic layer thickness below 5 nm. Therefore, the investigation of the monolayer regime is vital to identify the physics and chemistry of the organic semiconductor. In this paper, in situ macro-Raman analysis of 1.5 nm pentacene films deposited under ultra high vacuum conditions either on Au or SiO2 and then capped by several silver layers were performed.

Code: TP27	Time Slot/Poster Number: 089	Session: Raman at interfaces
Details on Solid-Electrolyte Interface of Cathode Surface under High Voltage Condition by Two-Dimensional Correlation Spectroscopy
Y. Park¹; N. H. Kim¹; G. Park¹; S. R. Ryu¹; H. C. Choi²; Y. M. Jung¹
¹Kangwon National University, Chuncheon, Korea; ²Chonnam National University, Gwangju, Korea

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Summary
Li-ion battery has safety problem such as explosion in the last decade. Especially overcharged condition of Li-ion battery has been studied, but the overcharge mechanism is still not clear. To study the characterization of cathode and formation of solid-electrolyte interface (SEI) on the cathode surface under high voltage condition, we have applied 2D correlation spectroscopy to the Raman, XPS and NEXAFS spectra of Li-ion battery. From Raman, XPS, NEXAFS spectra, we know that hexagonal LiCoO2 structure is distorted, and SEI components such as Li2O, Co3O4, Li2O3, etc. are formed on the cathode under overcharge process.