Large-scale three-dimensional (3D) CdS nanocrystals with a flowerlike morphology were synthesized by a facile hydrothermal treatment from Cd(NO3)2, thiourea, and hexamethylenetetramine [(CH2)6N4, HMT], where HMT acted as a capping agent. The reaction conditions influencing the synthesis of these 3D CdS nanocrystals such as initial precursor ratios, reaction time, reaction temperatures, and capping agents were studied and optimized. The morphology, structure, and phase composition of CdS nanostructures were examined by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and high-resolution TEM. The formation mechanism of the 3D CdS nanocrystals with flowerlike structure was proposed based on the results, which may pave the way to shape-controlled synthesis of inorganic nanocrystals with 3D complex structures. The room-temperature photoluminescence (PL) of the obtained CdS nanocrystals was also studied.

Well-defined hexangularly faced CdS nanorod arrays were fabricated via a facile one-step and nontemplate hydrothermal approach in large scale by using biomolecules of glutathione as capping agents. Structural and morphological evolutions of CdS nanorod arrays were studied by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. A formation mechanism of CdS nanorod arrays via this one-step synthesis was tentatively studied by investigating the effects of synthesis parameters on the nanorod arrays. The growth process of CdS nanorod arrays was discussed further from the absorption spectra of CdS nanorod arrays obtained at different reaction times.

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Solution processed inorganic/organic hybrid films of ZnO nanoparticles and poly(9,9-dihexylfluorene) (PFH) are sandwiched between two electrodes to form bulk heterojunction in this letter. The devices obtained show high ultraviolet photo-to-dark current ratio of about three orders of magnitude for −1V bias with a relatively fast response speed of less than 200ms after aging in air for enough time. The spectral response covers 300–420nm, with its peak locating around 335nm. Those results indicate that the ZnO/PFH hybrid devices might be used as low-cost UV optical switches or photodetectors.

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