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In this study, it is shown that with the increase of the number of layers of ultrathin MoS2 nanomaterials, the spacing of Raman shift increased and the photoluminescence intensity decreased. The monolayer MoS2 nanomaterials had the strongest photoluminescence intensity due to the rapid decrease of electron relaxation rate. With decreasing of temperature, the intensity emission enhanced and had a blue shift gradually. At the temperature of 79 K, the bound exciton luminescence peak was found, which was caused by the defect of the contact surface of the MoS2 and the SiO2/Si substrate or the impurities on the surface of the sample. [ABSTRACT FROM AUTHOR]

Highly dispersed ZnO quantum dots (QDs) in polyvinylpyrrolidone (PVP) nanotubes have been prepared by a single capillary electrospinning. The structure and optical properties characterizations were performed by x-ray diffraction, scanning and transmission electron microscopy, absorption, photoluminescence, and resonant Raman spectra. In the composites, PVP molecules passivate the surface defects of ZnO QDs and prevent the aggregations of ZnO QDs. As a result, the composites exhibit narrower band edge emissions and less laser thermal effects. Blueshifted band gap, enlarged exciton energy, and less exciton-longitudinal optical (LO) phonon interaction due to the quantum confinement effect have also been observed. [ABSTRACT FROM AUTHOR]

In this paper, Ag doped ZnO nanorods with N plasmon treatment were synthesized on Si substrate based on diffusion doping principle. At the same time, pure ZnO, Ag doped ZnO and ZnO nanorods with N plasmon treatment were also prepared. The experimental results showed that the surface of ZnO/Ag/N is the roughest, but there is no redundant Ag on the surface. The red shift of the absorption edge is the largest. The most noteworthy is that ZnO/Ag/N has a good acceptor emission behavior, and the calculated acceptor binding energy is about 128 meV. [ABSTRACT FROM PUBLISHER]