Enhancement of surface phonon modes in the Raman spectrum of ZnSe nanoparticles on adsorption of 4-mercaptopyridine

• NCJ Number: 304239
• Author(s): Syed K. Islam; John R. Lombardi
• Date Published: 2014
• Grant Number(s): 2009-DN-BX-K185
• Agencies: NIJ-Sponsored
• Award: Development Of Advanced Raman Spectroscopy Methods And Databases For The Evaluation Of Trace Evidence And The Examination Of Questioned Documents-Phase II

Annotation

This article reports that by chemically etching a thin film of crystalline ZnSe with acid, the authors observed a strong Raman enhancement of the surface phonon modes of ZnSe on adsorption of a molecule (4-mercaptopyridine).

 

Abstract

The surface is composed of oblate hemi-ellipsoids, which has a large surface-to-bulk ratio. The assignment of the observed modes (at 248 and 492 cm−1) to a fundamental and first overtone of the surface optical mode is consistent with observations from high-resolution electron energy loss spectroscopy as well as calculations. (publisher abstract modified)