Synthesis and structural, optical and thermal properties of CdS:Zn2+ nanoparticles

Abstract

Undoped and Zn (1-5, 10 %) -doped CdS nanoparticles were successfully synthesized by chemical method and polyvinylpyrrolidone was used as capping agent. The morphology and crystalline structure of the samples were studied by transmission electron microscopy and X-ray diffraction. The average particle size of the spherical nanoparticles determined by these techniques was of the order of 2.5-6 nm. The functional groups of the capping agent on CdS:Zn 2? surface were identified by FT-IR study. The band gap of the nanoparticles was calculated using UV-visible absorption spectra and the result showed that the band gap values were dramatically blue shifted from the bulk CdS. The optimum concentration of the doping ions was selected through absorption study. Photoluminescence of the CdS:Zn 2? nanoparticle showed strong blue and green emission. The thermal properties of the nanoparticles were analyzed by thermogravimetricdifferential thermal analysis.

Partially decomposed PVP as a surface modification of ZnO, CdO, ZnS and CdS nanostructures for enhanced stability and catalytic activity towards sulphamethoxazole degradation

“…Soltani et al [27] prepared ZnS by a microwave-hydrothermal method and obtained band gap energies 4.08-4.22 eV depending on microwave irradiation time. Muruganandam et al [28] reported that PVP-capped CdS via wet chemical method had a 2.6 eV band gap energy and 478 nm absorption edge, which then blue-shifted to 447 nm after doping with Zn 2+ . The FTIR spectra of the PVP-capped nanostructures were almost identical to that of pure PVP, as shown in figure 4.…”

Structural, surface morphological, optical and thermoelectric properties of sol–gel spin coated Zn doped CdS thin films

“…It is expected that the Zn doped CdS will increase the efficiency of the solar cell. The effective mass approximation method is used to calculate the particles size with the following relation where E gn and E gb are the band gap values of nanocrystalline CdS and bulk CdS semiconductor (E gb = 2.4 eV), m* is the effective mass of the electron (= 0.19 m o , m o is the rest mass of electron) and R is the particle radius [34,35]. The particle size of the prepared samples was calculated and summarized in Table 3.…”

Role of Polyvinylpyrrolidone (PVP) on Controlling the Structural, Optical, and Electrical Properties of Vanadium Pentoxide (V2O5) Nanoparticles

“…They were able to synthesize nanoparticles below 10 nm. Muruganandam et al [22] synthesized CdS:Zn 2 + with PVP as capping agent. With the help of PVP, highly mono dispersed CdS nanoparticles were prepared which exhibited significantly enhanced luminescence and high chemical stability.…”