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Vapor Phase Exchange of Self-Assembled Monolayers for Engineering of Biofunctional Surfaces.
Langmuir
April 2017
Department of Physics, Physics of Supramolecular Systems and Surfaces, University of Bielefeld, 33615 Bielefeld, Germany.
We show that 4'-nitro-1,1'-biphenyl-4-thiol self-assembled monolayers (NBPT SAMs) on gold can be exchanged with 11-(mercaptoundecyl)triethylene glycol (CEGOH) SAMs via vapor deposition (VD). The pristine and the exchanged SAMs obtained by VD as well as solution method (SM) were characterized by X-ray photoelectron spectroscopy (XPS) and polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS). Using surface plasmon resonance (SPR), it is shown that CEGOH SAMs on gold obtained by vapor deposition exchange (VD) have the same protein resistivity as SAMs obtained by the direct self-assembly process.
View Article and Find Full Text PDFStructural changes in iron oxide and gold catalysts during nucleation of carbon nanotubes studied by in situ transmission electron microscopy.
ACS Nano
January 2014
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , 72 Wenhua Road, Shenyang 110016, China.
We report a simple, versatile in situ transmission electron microscopy (TEM) approach for investigating the nucleation and growth mechanism of carbon nanotubes (CNTs), by which the composition, phase transition, and physical state of various catalysts can be clearly resolved. In our approach, catalyst nanoparticles (NPs) are placed in a multiwall CNT "tubular furnace" with two open ends, and a high temperature is obtained by Joule heating in the specimen chamber of a TEM. The carbon is supplied by electron irradiation-induced injection of carbon atoms.
View Article and Find Full Text PDFLocalization of chromophore absorption signals in TEM with an improved prism-mirror-prism filter.
J Electron Microsc (Tokyo)
February 2001
Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, Canada.
A corrected prism-mirror-prism electron energy filter with curved entrance and exit faces was designed and incorporated into a Zeiss EM902 transmission electron microscope. The installation of the new filter required little modification to the existing microscope geometry and electronics. The filter had an energy resolution of 1.
View Article and Find Full Text PDFThe research center for ultra-high voltage electron microscopy at Osaka University.
J Electron Microsc Tech
July 1989
Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Japan.
High-voltage electron microscopy has shown itself advantageous for the study of natural science, including biology, but especially for materials science. The most important advantage for materials science is for in situ experiments about the detailed processes of the phenomena that occur in bulk materials. The present paper is mainly concerned with several types of in situ experiments that have been carried out in the Research Center for Ultra-High Voltage Electron Microscopy, Osaka University.
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