The Effect of Polyvinylpyrrolidone on the Optical Properties of the Ni‐Doped ZnS Nanocrystalline Thin Films Synthesized by Chemical Method

Abstract

We report the optical properties of polyvinyl-pyrrolidone (PVP) and the influence of PVP concentration on the photoluminescence spectra of the PVP (PL) coated ZnS : Ni nanocrystalline thin films synthesized by the wet chemical method and spin-coating. PL spectra of samples were clearly showed that the 520 nm luminescence peak position of samples remains unchanged, but their peak intensity changes with PVP concentration. The PVP polymer is emissive with peak maximum at 394 nm with the exciting wavelength of 325 nm. The photoluminescence exciting (PLE) spectrum of PVP recorded at 394 nm emission shows peak maximum at 332 nm. This excitation band is attributed to the electronic transitions in PVP molecular orbitals. The absorption edges of the PVP-coated ZnS : Ni0.3% samples that were shifted towards shorter wavelength with increasing of PVP concentration can be explained by the absorption of PVP in range of 350 nm to 400 nm. While the PVP coating does not affect the microstructure of ZnS : Ni nanomaterial, the analyzed results of the PL, PLE, and time-resolved PL spectra and luminescence decay curves of the PVP and PVP-coated ZnS : Ni samples allow to explain the energy transition process from surface PVP molecules to the Ni2+centers that occurs via hot ZnS.

Alteration of structural, optical and electrical properties of CdSe incorporated polyvinyl pyrrolidone nanocomposite for memory devices

“…22 Interestingly, luminescence peak of CdSe is found to be nearly at around 535 nm in the literature. 36 Whereas in our case, luminescence peak of CdSe is at 564 nm. This results in red shift of PL spectra of polymer nanocomposite for CdSe nanoparticles.…”

Stabilization of PbS quantum dots by high molecular polyvinylpyrrolidone

“…[21] The conclusion about the existence of excitation energy-transfer processes between PVP molecules and ZnS nanoparticles is supported by the authors [22] that studied the PVP influence on optical and spectral properties of thin nanocrystalline ZnS films doped by Ni 2 + ions. Spectral and luminescent properties of PbS suspensions that were stabilized by high-molecular PVP (Ms = 1300000) were studied in Konstantatos et al [1] and Rowan.…”

Polyvinylpyrrolidone as a New Fluorescent Sensor for Nitrate Ion

“…To date, the non-conjugated polyvinylpyrrolidone (PVP) is mostly used as a passivator or a capping agent for semiconductor such as ZnS or CdS, with the purpose to reduce the agglomeration and improve the optical property [12]. Some studies reported the application of the PVP as a sensor [14,15]. Wang et al reported that the PVP can be used as electrochemical sensor for acyclovir molecule [14], while Zhang et al used PVP nanocomposite as a humidity sensor [16].…”

“…Wang et al reported that the PVP can be used as electrochemical sensor for acyclovir molecule [14], while Zhang et al used PVP nanocomposite as a humidity sensor [16]. Since the PVP has been also reported to have photoluminescence property [15], it is worthy to study the possibility to use the non-conjugated PVP as the fluorescence sensor. To the best of our knowledge, there is no investigation on the application of the PVP as the fluorescence sensor.…”