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Mixed adlayer of alkanethiol and peptide on GaAs(100): Quantitative characterization by X-ray photoelectron spectroscopy
Birck and NCN Publications
  • Heeyeon P Wampler, Purdue University - Main Campus
  • Dmitry Zemlyanov, Birck Nanotechnology Center, Purdue University
  • Kangho Lee, Purdue University - Main Campus
  • David B Janes, Purdue University
  • Albena Ivanisevic, Birck Nanotechnology Center, Purdue University
Abstract

Homogeneous and mixed adlayers composed of an alkanethiol (1-octddecanethiol, ODT) and a peptide (CGISYGRKKRRQRRR) on GaAs(100) were formed in two different solvent systems: phosphate-buffered saline (PBS) and N,N-dimethylformamide (DMF). The chemical composition of each adlayer was characterized by X-ray photoelectron spectroscopy (XPS). The data showed that the makeup of the adlayer and its stability largely depends on the solvent used. Angle-resolved XPS also revealed that the adlayer thickness and tilt angles were different from values obtained from ellipsometry measurements and vastly varied between the two solvents used. The coverage data extracted from the XPS measurements indicated that homogeneous adlayers of peptide in PBS buffer form a multilayered film. Homogeneous alkanethiol adlayers exhibited monolayer coverage under all solvent treatments. Coadsorbed layers containing both alkanethiol. and peptide have fractional monolayer coverage in both solvents.

Keywords
  • SELF-ASSEMBLED MONOLAYERS; BARE SEMICONDUCTOR SURFACES; GALLIUM-ARSENIDE; GAAS-SURFACES; GAAS(001); GOLD; FUNCTIONALIZATION; FIBRONECTIN; GRADIENTS; DENSITY
Date of this Version
4-1-2008
Citation
Langmuir 2008, 24, 3164-3170
Citation Information
Heeyeon P Wampler, Dmitry Zemlyanov, Kangho Lee, David B Janes, et al.. "Mixed adlayer of alkanethiol and peptide on GaAs(100): Quantitative characterization by X-ray photoelectron spectroscopy" (2008)
Available at: http://works.bepress.com/dmitry_zemlyanov/17/