Size quantization of colloidal semiconductor particles in silicate glasses

Promising avenues of research in nanoscience: chemistry of semiconductor nanoparticles

“…For instance, CdS nanoparticles were bonded to Zn atoms of Zn doped SBA 15 (pore diameter ~6 nm) through dithiol bridges. 172 Highly luminescent samples were fabriced by incorporating CdTe nanoparticles during the synthesis of glass in the sol gel process. CdS nanostructures can also be formed inside SBA 15 pores by impregnating the mesoporous silica with aqueous cadmium thioglycolate and subsequent anneal ing at 160 °C for 24 h. 171 Dissolution of SiO 2 in 2 M NaOH affords a material comprised of CdS nanowires of diameter 6 nm with a ~3 nm separation between wires.…”

Electronic Properties of Q-CdS Clusters Stabilized by Adenine

“…An understanding of the characteristic photochemical and photophysical properties of these nanocrystals requires preparing tailored particles with a narrow size distribution. The size of these particles has been regulated by synthesizing them in a variety of organized media such as micelles (5,6), vesicles (7,8), Langmuir-Blodgett films (9), polymer films (10,11), glasses (12), and zeolites (13,14). These particles, having a large specific surface, are susceptible to any change taking place at their surface.…”

Luminescent Colloidal Silicon Suspensions from Porous Silicon

“…In addition, the photochemical and nonlinear optical prope&es of such matecials ace of i n-for their potential technological applications (8)(9)(10). Colloidal semiconductors exhibiting quantum confinement &em have been prepred in solution (1-3), polymer (if), glass (12), and zeolite (13) Singleuystal polished (100) wakn of P-doped (n-type) Si of 0.5 to 2 ohmcm mistivity and Bdoped (p-type) Si of 6 to 10 ohman resistivity were used. Ohmic contam were fonned as previously described (30) and mounted such that only Si was exposed to the etching bath.…”