Abstract
In this work, SiO2/ZnO composite hollow sub-micron fibers were fabricated by a facile single capillary electrospinning technique followed by calcination, using tetraethyl orthosilicate (TEOS), polyvinylpyrrolidone (PVP) and ZnO nanoparticles as raw materials. The characterization results of the scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) spectra indicated that the as-prepared composite hollow fibers consisted of amorphous SiO2 and hexagonal wurtzite ZnO. The products revealed uniform tubular structure with outer diameters of 400–500 nm and wall thickness of 50–60 nm. The gases generated and the directional escaped mechanism was proposed to illustrate the formation of SiO2/ZnO composite hollow sub-micron fibers. Furthermore, a broad blue emission band was observed in the photoluminescence (PL) of SiO2/ZnO composite hollow sub-micron fibers, exhibiting great potential applications as blue light-emitting candidate materials.
Highlights
One-dimensional hollow nanostructure, as a specific one-dimension morphology, has attracted considerable attentions due to its wide application prospect in many fields such as electrochemical energy storage, biomedical drugs delivery, sensors, chemical reactions in nanoscale [1,2,3,4,5,6]
tetraethyl orthosilicate (TEOS) was dissolved in 3 mL ethanol, and 0.25 g PVP and 0.5 mL acetic acid were dissolved in the TEOS ethanol solution at room temperature with magnetic stirring for 60 min
The morphologies of the as-synthesized products were characterized by a field emission scanning electron microscopy equipped with an energy-dispersive X-ray spectrometer (EDS) unit (FESEM; S4800, Hitachi, Tokyo, Japan) and a transmission electron microscope (TEM; JEM-2000EX, JEOL, Tokyo, Japan)
Summary
One-dimensional hollow nanostructure, as a specific one-dimension morphology, has attracted considerable attentions due to its wide application prospect in many fields such as electrochemical energy storage, biomedical drugs delivery, sensors, chemical reactions in nanoscale [1,2,3,4,5,6]. Recent research works have shown that 1D tubular nanostructure is facilely fabricated by using the two-capillary coaxial electrospinning technique. The electrospinning technique with a single capillary has been reported to be developed for fabricating hollow nanofibers by few researchers. Reported that SiO2 hollow fibers with hierarchical walls were fabricated by the sol-gel combined two-capillary spinneret co-electrospinning technique, using triblock copolymer as the porous directing agent. A simple single-spinner electrospinning technique was developed to fabricate the composite hollow sub-micron fibers consisting of amorphous SiO2 and hexagonal wurtzite structure. This research work provides a new route for synthesizing SiO2 /ZnO composite hollow sub-micron fibers and offers a general reference for other materials composite hollow nanostructures synthesis
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