Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Abstract

Highly monodispersed CdS nanoparticles using polyvinyl pyrrolidone (PVP) as the capping agent were synthesised by chemical coprecipitation method. The surface-modified cadmium sulfide nanoparticles were found to be remarkably stable. In the presence of PVP, cubic phase with small grain size of CdS were observed in XRD. The peaks were identified to originate from (111), (220) and (311) planes of CdS, respectively. The crystallite size of the synthesised CdS nanoparticles was about 3 nm calculated from the (111) plane of XRD pattern and it was also confirmed through HRTEM. Morphology and elemental mapping of the synthesised nanoparticles were studied by SEM and EDX analyses. Increase in the band gap with decrease in the particle size was observed from the reflectance mode UV spectrum, which confirms the quantum confinement effect. From the photoluminescence studies, enhanced near-band-edge blue light emission and significantly reduced defect-related green emission were observed. Longitudinal optical (LO) phonon modes, corresponds to pure CdS were observed in Raman spectrum.

Effect of various zinc oxide nanoparticles in membrane photocatalytic reactor for Congo red dye treatment

“…Agglomeration is the process resulting from the Ostwald ripening and Vander Waals interactions between nanoparticles when the particle growth is not controlled [11]. Agglomeration can be prevented by stabilising them electrostatically in suitable phases to achieve the selected size [12]. A current trend in view of reducing the agglomeration is capping the nanoparticles using polyvinyl pyrrolidone (PVP) as a stabilising agent [13,14].…”

Insight into co-operative growth of nearly monodispersive CdS nanocrystals embedded in polyvinyl pyrrolidone

“…(i) Stirring leads to size distribution, although it may be homogenous as reported [7,10]. This suggests that if additional kinetic energy is provided, it allows larger size NCs to be included in polymer matrix thus leading to larger size distribution.…”

“…Further, it is interesting to note that CdS NCs embedded in PVP matrix has shown promising and better NLO property as compared to bare CdS NCs as well as CdS NCs embedded in other polymer matrices [21][22][23]. CdS-PVP NCp has been investigated for various nonlinear and linear optical properties [2][3][4][5][6][7][8][9][10][11][12][13][14][15]23].…”

“…Nanocomposite (NCp) of semiconductor nanocrystals (NCs) embedded in polymer matrix [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] is highly desirable in order to exploit the full potential of NC's applications in optoelectronic devices, gas sensors, etc. Polymers provide flexibility, processibility, and chemical Electronic supplementary material The online version of this article (doi:10.1007/s10853-015-9481-3) contains supplementary material, which is available to authorized users.…”

“…passivation, keeping intact the optoelectronic properties of semiconductor NCs or improving it. In last decades, the need to find out suitable techniques to create NCps of semiconductor NCs embedded in a polymer matrix has led to extensive research in this field [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Finding new routes for driving organic polymers and inorganic NCs to self-assemble into NCps is one of the main issues.…”