Application of Hot Press Sintering to Na_2O-B_2O_3-SiO_2 Gels Containing Quantum Dots for Lowering of Densification Temperature

摘要

Na_2O-B_2O_3-SiO_2 (NBS) gels containing a large amount of CdS quantum-dots (10 wt%) were densified using the hot press (HP) sintering method. By HP treatment, full-densification temperature could be lowered by about 40deg C than that of the normal non-pressing (NP) heat treatment. Excition absorption of CdS quantum-dots in HP-sample showed a large blue shift compared with that in the NP sample, and the size-distribution of CdS dots remained very sharp, with a mean particle diameter d=3.66 nm and a standard deviation of #sigma#=0.72. HP pressure had a large effect on the reduction of sintering temperature and time, resulting in the suppression of the aggregation and growth of CdS quantum-dots in NBS glasses.