Surface Potential Difference of Biomineralized Inorganic Nanodot by Kelvin Probe Force Microscopy

概要

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Ferritins were bound electrostatically in an aqueous condition to the silicon wafer, which was modified with aminosilane molecules. An investigation of metal nanoparticles (Fe) in ferritin by different experimental techniques, namely, Kelvin probe force microscopy (KFM) and X-ray photoelectron spectroscopy (XPS), was carried out. Fe nanoparticles showed exceptional behavior as determined by KFM and XPS. Initial results concerning these measurements, particularly with XPS, were those of Fe2O3 particles. The instrument can be used for imaging the surface potential difference by KFM, and by simultaneous topography to study the effects of Ar+ ion bombardment at 3.0 keV in XPS. After the Ar+ ion bombardment of the ferritin particles, All of the Fe2O3 ferritin nanoparticles showed important changes to Fe nanoparticles in terms of their stoichiometry in a very short time. The surface potential difference between the ferritin and Si substrate can be measured with high spatial sensitivity using KFM before/after Ar+ ion bombardment. Furthermore, KFM has shown that there exists a very high surface potential, probably owing to the reduction of the surface to its element induced by Ar+ ion bombardment. Initial and experimental results of ferritin with KFM using Ar+ ion bombardment concerning these parameters are presented in this article.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-08-30