Authors: N. Hullavarad, S. Hullavarad
Affilation: University of Alaska Fairbanks, United States
Pages: 472 - 473
Keywords: sol-gel, CdS, CdSe, monodispersive
‘Quantum dots’ or nanoparticles of diverse semiconductor materials are extensively studied because of their interesting size dependent properties. It is further interesting to organize the quantum dots in the form of superlattices thin films, monolithics, ordered arrays for fruitful applications. Various applications such as sensors, displays, recordings, communications etc. require condensed organic or inorganic tunable material in the ultra violet to visible range. This work discusses the synthesis of CdSe nanoparticles in a silica matrix. The UV absorption measurements of CdSe nanoparticles indicated sharp absorption at 272 nm, with the energy gap of 4.54eV. Silica gel containing the CdSe nanoparticles was spin coated onto substrates to form thin film samples. Scanning Electron Microscope (SEM) measurements revealed formation of CdSe nanoparticles within the gel-network. The paper discusses the single size distribution of CdSe nanoparticles in the silica gel matrix. The matrix consisting of monodispersed CdSe nanoparticles in a silica gel has potential applications in sensors, tunable waveguides, and sensitive photon counting systems, luminescent displays, and laser micro cavities.