Synthesis and Characterization of Poly(vinylpyrrolidone)-Modified Zinc Oxide Nanoparticles

Abstract

We have synthesized highly monodisperse wurtzite ZnO nanoparticles using poly-(vinylpyrrolidone) (PVP) as the capping molecules. The effect of surface modification on the size, structure, morphology, and optical properties of ZnO nanoparticles was investigated. It was found that many properties of the ZnO nanoparticles could be optimized by simply varying the molar ratio Zn(II)/PVP. The ZnO nanoparticles prepared under the optimum conditions are particularly stable, monodisperse, as well as small in size. The EXAFS result showed a structural contraction in the ZnO nanoparticles relative to the bulk. These nanoparticles exhibit distinct excitonic absorption features, markedly enhanced near-bandedge UV photoluminescence, and significantly reduced defect-induced green emission. The third-order nonlinear optical response of these PVP-capped ZnO nanoparticles in a dilute solution was found to be larger than that of the bulk ZnO by at least 2 orders of magnitude.

XAFS study of starch-stabilized magnetite nanoparticles and surface speciation of arsenate

“…However, the observed coordination number values of the stabilized nanoparticles are lower than those of the bulk particles owing to the higher surface-to-volume ratios for smaller particles (Guo et al, 2000).…”

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

“…One-dimensional nanostructures exhibit interesting electronic and optical properties due to their low dimensionality leading to quantum confinement effects. The novel properties of nanoscale zinc oxide particles have found applications in a variety of applications such as luminescence [1][2][3], varistors [4,5], solar cells [6], gas sensors [7,8]. Many of the synthetic approaches such as sol-gel method [13], co-precipitation [12], hydrothermal method [14], microwave synthesis [9][10][11], and thermal evaporation method [15] have been used for the preparation of ZnO powders.…”

“…The novelty of this method is that the samples were not purified and centrifuged in the fabrication stage because of oxidation. In many synthesis methods, the researchers purified samples to have uniform particles which oxidize ZnO nanoparticles by purification and centrifugation process [2,8,[10][11][12][13][14][15]. Synthesis of ZnO nanoparticles by sol-gel technique is reported by Zn(NO 3 ) 2 Á6H 2 O precursor and calcined at 500°C.…”

Development of a ZnO-modified Light-Scattering Sensor for the Detection of alcohols

“…1 Nanostructured ZnO materials can be prepared in the form of nanoparticles, 2,3 nanorods, 4,5 nanowires, 6,7 and other morphologies 8,9 through the use of vapor deposition or wet chemical methods. These materials have been used in devices, such as field-effect transistors, 10,11 solar cells 12,13 and as photocatalysts.…”