Yk. Yoon et al., EFFECT OF PHASE-SEPARATION ON PRECIPITATION CHARACTERISTICS OF CUCL QUANTUM DOTS IN THE BOROSILICATE GLASS SYSTEM, Journal of non-crystalline solids, 203, 1996, pp. 195-201
Effects of phase separation on the precipitation of CuCl particles in
the sodium-borosilicate glass system have been investigated using acid
elution measurement, UV/VIS absorption spectroscopy, and scanning and
transmission electron microscopy. Compositions of 7.5Na(2)O-40B(2)O(3
)-52.5SiO(2) and 22.5Na(2)O(3)-40B(2)O(2)-37.5SiO(2) (wt%) were chosen
as matrix glasses based on their phase separability and the relations
hip between the phase separation of the glass matrix and the precipita
tion of CuCl particles was studied. The CuCl precipitation occurred on
ly in the phase-separable glass matrix and the radius of the CuCl nano
crystals increased with heat treatment time. The CuCl crystals were pr
ecipitated both in the boron-rich phase and in the silica-rich phase.
Larger CuCl particles, with an average size of similar to 3.3 nm, than
those in the silica-rich phase, which averaged similar to 1.7 nm, wer
e observed to precipitate in the boron-rich phase. The observed CuCl p
article size difference and the non-uniform distribution of the partic
les are attributed to the fast growth of the CuCl particles due to the
lower viscosity of the boron-rich phase compared to that in the silic
a-rich phase.