Formation and Optical Properties of Quantum Size Inorganic Colloidal Particles
Quantum size semiconductor clusters are a new class of materials with hybrid molecular-solid state properties. The synthetic procedures for the preparation of stable, uniform nanometer-scale semiconductor clusters with predetermined surface properties in liquid solutions and silicate glasses were developed. The capability of ESR technique to reveal the nature of surface defects of small colloidal semiconductor particles was tested using CdS as a model system. Also, structural changes during the growth of HgI_2 particles were found. The kinetics of growth of silver halide particles was investigated. Wavelength dependent light scattering detection was used to study the formation and growth of AgBr particles in the presence of a huge excess of bromide ions. The photochemical fabrication of AgBr/Ag composites was achieved by controlling the exposure time. Good agreement between the theoretically predicted optical extinction and experimentally measured spectra was found. Using fluorescence spectroscopy with diode array detection as a model system signal enhancement was achieved through the implementation of software based strategies, i.e., approaches based on the separation of the significant data containing signals from the noise through the application of post measurement mathematical techniques.
- Pub Date:
- QUANTUM SIZE SEMICONDUCTOR CLUSTERS;
- Chemistry: Physical; Physics: Condensed Matter