title: Secondary ion mass spectrometry study of thermal diffusion of Au nanoparticles in porous SiO2 matrices.
abstract: Migration of Au nanoparticles by thermal diffusion into porous SiO2 matrix substrates has been studied using secondary ion mass spectroscopy (SIMS). When the samples having four different porosities were annealed at T = 410 K for 1.5 h, no noticeable variations in the thermal diffusion of Au nanoparticles were observed. All the measured diffusion coefficients of Au particles, were an order of 10(-15) cm2/s at 300-410 K in a very limited interfacial region. Regardless of their porosities, the pores must be discontinuous, which acts as a diffusion barrier to block the continuous diffusion of Au particles.
authors.affiliation: Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology, Institute of Biological Interfaces, Sogang University, Seoul 121-742, Korea.
authors.forename: Oh-Sun
authors.initials: OS
authors.lastname: Kwon
authors.forename: Yeon-Hee
authors.initials: YH
authors.lastname: Lee
authors.forename: Kwangpyo
authors.initials: K
authors.lastname: Hong
authors.forename: Jaeyong
authors.initials: J
authors.lastname: Kim
authors.forename: Kwanwoo
authors.initials: K
authors.lastname: Shin
mesh_terms: D004058:Diffusion; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles; D008956:Models, Chemical; D012822:Silicon Dioxide / Q000737:chemistry*; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods*
chemical_list: D006046:Gold; D012822:Silicon Dioxide