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Quantitative evaluation of covalently bound molecules on GaP (100) surfaces
Birck and NCN Publications
  • Rosangelly Flores-Perez, Purdue University - Main Campus
  • Dmitry Zemlyanov, Birck Nanotechnology Center, Purdue University
  • Albena Ivanisevic, Purdue University - Main Campus
Abstract

The study utilizes surface sensitive techniques in order to quantitatively characterize the nature of organization and bonding of alkanethiol adsorbates on GaP (100) surfaces. The evaluation was performed using water contact angle, atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The hydrophobicity and consistency of surface roughness were studied via water contact angle and AFM. The FT-IR experimental protocol permitted the identification of characteristic functional groups on the surface and enabled insight into the organization within the adlayers on the GaP surface. XPS data showed evidence for the formation of a covalent bond between the sulfur and the surface and was used to calculate the adlayer thicknesses, tilt angles, and molecular coverages for different adsorbates. The thickness and tilt angles values were comparable to other modified semiconductor materials. High coverages were observed for all alkanethiols on GaP (100). The quantitative XPS protocol reported can be applied to the evaluation of other adsorbates on semiconductor materials.

Keywords
  • SELF-ASSEMBLED MONOLAYERS; RAY PHOTOELECTRON-SPECTROSCOPY; BARE SEMICONDUCTOR SURFACES; GAAS SURFACE; XPS; ALKANETHIOL; GAAS(001); PEPTIDES; ANGLE; IRRADIATION
Date of this Version
1-1-2008
Citation
J. Phys. Chem. C 2008, 112, 2147-2155
Citation Information
Rosangelly Flores-Perez, Dmitry Zemlyanov and Albena Ivanisevic. "Quantitative evaluation of covalently bound molecules on GaP (100) surfaces" (2008)
Available at: http://works.bepress.com/dmitry_zemlyanov/1/