Jump to main content
Jump to site search


Controlled morphology of ZnSe nanostructures by varying Zn/Se molar ratio: The effects of different morphologies on optical properties and photocatalytic performance

Abstract

The effects of Zn/Se molar ratios on the morphology and photocatalytic performance of ZnSe nanostructures, which were synthesized by a co-precipitation method, were investigated. To intensively investigate the effects of the Zn/Se ratios, we performed a series of controllable experiments with different concentrations of selenium anions (the concentration ratios of Zn2+: Se2-=1:0.6-1.4 in the solution). X-ray diffraction (XRD) patterns of the samples indicated that the phase of the samples was not changed by different Zn/Se ratio. However, the XRD patterns of the samples with Zn/Se<1 ratio indicated Se peaks as an external phase. Field emission electron microscope (FESEM) and transmission electron microscopy (TEM) images showed different morphologies such as nanoparticles (NPs), nanorods (NRs), nanobelts (NBs), and polyhedral by varying Zn/Se ratios. In addition, high resolution TEM (HRTEM) image of the NBs showed that the NBs were grown toward [111] direction. Photoluminescence (PL) and UV-visible spectrometers indicated that different Zn/Se ratios caused create different defects and band gap shifting. Valance band edge (VBE) position of the samples was calculated by x-ray photoelectron spectroscopy (XPS) and it was observed that, the VBE position was not affected by different Zn/Se ratio. Finally, photocatalytic performance of the samples was examined under a visible-light source irradiation. Photocatalytic activity tests demonstrated that, different morphologies and optical properties of the ZnSe nanostructures could affect the photocatalytic performance of the samples. Furthermore, N2 adsorption-desorption isotherms curves of the samples indicated two types of hysteresis loops for the samples with highest and lowest Zn/Se ratios. It was observed, the sample with the lowest Zn/Se ratio (1:1.4) showed the highest photocatalytic activity and stability in compared to the other samples.

Back to tab navigation

Publication details

The article was received on 11 May 2018, accepted on 29 Jun 2018 and first published on 29 Jun 2018


Article type: Paper
DOI: 10.1039/C8CE00775F
Citation: CrystEngComm, 2018, Accepted Manuscript
  •   Request permissions

    Controlled morphology of ZnSe nanostructures by varying Zn/Se molar ratio: The effects of different morphologies on optical properties and photocatalytic performance

    M. Bigdeli Tabar, S. M. Elahi, M. Ghoranneviss and R. Yousefi, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00775F

Search articles by author

Spotlight

Advertisements