Photoluminescence properties of highly dispersed ZnO quantum dots in polyvinylpyrrolidone nanotubes prepared by a single capillary electrospinning

Abstract

Highly dispersed ZnO quantum dots (QDs) in polyvinylpyrrolidone (PVP) nanotubes have been prepared by a single capillary electrospinning. The structure and optical properties characterizations were performed by x-ray diffraction, scanning and transmission electron microscopy, absorption, photoluminescence, and resonant Raman spectra. In the composites, PVP molecules passivate the surface defects of ZnO QDs and prevent the aggregations of ZnO QDs. As a result, the composites exhibit narrower band edge emissions and less laser thermal effects. Blueshifted band gap, enlarged exciton energy, and less exciton-longitudinal optical (LO) phonon interaction due to the quantum confinement effect have also been observed.

Enhanced ultraviolet emission from highly dispersed ZnO quantum dots embedded in poly(vinyl pyrrolidone) electrospun nanofibers

“…It is great challenge to enhance the ultraviolet (UV) emission of nanostructural ZnO materials. Thus, in recent years, the optical properties of ZnO nanocrystals embedded in organic polymers, such as poly(vinyl alcohol) (PVA), poly(methyl methacrylate) (PMMA) and poly(vinyl pyrrolidone) (PVP) [9][10][11], and inorganic materials, such as CaF 2 , MgO, SiO 2 and BaF 2 [12][13][14][15], have been widely studied. Especially, polymer/ZnO nanocrystals composites with one dimensional (1D) nanostructure have been of immense interest because of their large length-to-diameter ratio, special optical and conductivity properties, and so forth, which might be very useful to fabrication of nanoscale electronic and optoelectronic devices.…”

Electrospinning of fluorescent fibers from CdSe/ZnS quantum dots in cellulose triacetate

“…QDs have been previously incorporated into polymeric electrospun fibers: PLLA ands PS fibers embedded with ZnSe quantum dots were prepared by Schlecht et al 11 , PMMA fibers embedded with CdSe/ZnS quantum dots were electrospun by Tomczak et al 12 and Liu et al 21 Spun fibers from mixtures of CdSe/ZnS QDs and light guiding polymer, Wang et al 22 prepared fibers from cadmium acetate and polyethylene oxide (PEO) solution and treated the resultant fibers with H 2 S to generate CdS nanoparticles in-situ and most recently Li et al 20 made nanotubes by electrospinning mixtures of colloidal ZnO and polyvinylpyrrolidone (PVP) solution. In the current approach, small volumes ($ 0.1 mL) of CdSe/ZnS QDs in toluene (either single particle sizes or a mixture) were added to the CTA solution and fibers were obtained by electrospinning the mixture.…”

“…[1][2][3][4][5] Electrospun fibers have been proposed for many different types of applications including filtration, textiles, 6 tissue engineering, [7][8][9][10] optical and electronic devices, 11,12 and sensing. 13,14 The properties of electrospun polymer fibers can be further enhanced by the incorporation of functional materials, such as polymer (i.e., to make a blend), 15,16 metal complexes, [17][18][19] nanoparticles, 12,[20][21][22][23] carbon nanotubes, 24,25 dye molecules, 12 dye loaded zeolite crystals, 26 or proteins. 14,27 In a typical experiment, a high voltage (kV) is applied to a metallic capillary through which the polymeric solution is fed.…”

“…21,30 Electrospinning seems to provide a potentially straightforward route toward the preparation of such systems. 11,20,21 EXPERIMENTAL SECTION…”

Electrospun Scaffold of Collagen and Polycaprolactone Containing ZnO Quantum Dots for Skin Wound Regeneration

“…The XRD pattern of ZnO QDs presents the peaks at 2 θ = 31.89, 34.40, 36.34, 47.59, 56.48, 62.78, and 68.65, corresponding to (100), (002), (101), (102), (110), (103), and (112) planes of hexagonal wurtzite structure of ZnO QDs (Fig. 2 c) [ 45 , 46 ]. Under UV light ( λ = 365 nm), the obvious yellow fluorescence can be observed for the ZnO and NH 2 -ZnO QDs aqueous solution (Fig.…”