Photoassisted synthesis of CdSe and core-shell CdSe/CdS quantum dots
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Photoassisted synthesis of CdSe and core-shell CdSe/CdS quantum dots.
1229. The Different Nature of Band Edge Absorption and Emission in Colloidal PbSe/CdSe Core/Shell Quantum Dots
B. De Geyter, Y. Justo, I. Moreels, K. Lambert, P. F. Smet, D. Van Thourhout, A. J. Houtepen, D. Grodzińska, C. de Mello Donegá, A. Meijerink, D. Vanmaekelbergh and Z. Hens
5, 58--66 (2011)
Photoassisted Synthesis of CdSe and Core-Shell CdSe/CdS Quantum Dots.
Formation of various other nanostructures of TiO2 includes nanoplatelet via hydrothermal/anodization route,, porous nanofoam via direct decomposition and reaction of hydrogen peroxide inside a TiO2/hexadecylamine slurry dispersion, and nanocrystalline thin film via spray deposition of TiO2 nanoparticles. As far as nanocomposites of TiO2 with other organic/inorganic materials are concerned, TiO2 at narrowgap semiconductor materials garnered much interest in dye-sensitized TiO2-based solar cells.,– Narrow band-gap semiconductors such as CdS, CdSe, CdTe, PbS, Bi2S3, and CuInS2, are used with TiO2 nanomaterials, because these narrow-gap materials absorb light in the visible region and transfer electrons to large band-gap TiO2, and thus serve as sensitizers. The fabrication of core-shell or similar composite structures generally follows chemical/hydrothermal syntheses of TiO2 core followed by the narrow-gap nanoparticles deposition via chemical bath deposition/spray pyrolysis/CVD/ALD/solvothermal methods. Cheng and colleagues reported the fabrication of highly ordered WO3/TiO2 composite nanotubes via a combinatorial PAM-based sol–gel method. Brinley et al reported SiO2−TiO2 hybrid antireflective coating via a sol–gel process. For enhancement of photocatalytic activity of TiO2, various groups reported the syntheses of TiO2-activated carbon or TiO2–CNT mixture or nanocomposite, which limit electron-hole recombination– and thus improve reactivity. The syntheses of TiO2/CNT nanocomposites include sol–gel, CVD, and PVD techniques.,– In addition, TiO2-polymer nanocomposite gained renewed interest to create novel organic/inorganic hybrid materials for improved photocatalytic activity, water/air purification, or bactericidal antifouling. Several different methods have been adopted to integrate TiO2 with target materials, which include self-assembly monolayer adsorption on functionalized surfaces, sol–gel synthesis, vacuum vaporization, sputtering, CVD/MOCVD, Langmuir–Blodgett method, ultrasonic irradiation, enzymatic synthesis, or surface-initiated polymerization.–
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