T. Akita et al., Analytical TEM study on the dispersion of Au nanoparticles in Au/TiO2 catalyst prepared under various temperatures, SURF INT AN, 31(2), 2001, pp. 73-78
Transmission electron microscopy (TEM) observations were made for Au/TiO2 c
atalysts prepared by calcination in air at different temperatures from room
temperature to 873 K in order to study the growth process of Au particles
over the surface of TiO2. Many Au clusters with diameters of similar to1 nm
were observed on the TiO2 surface when Au(OH)(3)/TiO2 precursor prepared b
y the deposition precipitation method was calcined at temperatures below 47
3 K. They grew to form larger particles being trapped at the interface betw
een TiO2 particles at temperatures above 573 K. The growth of Au particles
became markedly rapid above 673 K. The growth process of Au particles durin
g calcination was discussed based on the size distribution of Au particles
and the Arrhenius plots of the mean diameter of Au particles against calcin
ation temperature. Both TEM and electron energy-loss spectroscopy measureme
nts based on a scanning transmission electron microscope revealed that the
Au clusters were preferentially deposited with high density on specific TiO
2 particles that have the rutile structure. Copyright (C) 2001 John Wiley &
Sons, Ltd.