“…As a result, the peak at around 389 °C could consist of decomposition of acetate, PVP, and cyclization of PAN. The exothermic peaks at about 482, 520, and 635 °C in the DTA curve were thought to be due to the continue decomposition of zinc acetate and release of the oxidation of carbon and carbon monoxide from PAN and PVP. , All the above DTA analyses could be confirmed by a dramatic weight loss in the TG curve at the corresponding temperature range from 50 to 650 °C. After 650 °C there was no change in weight loss, indicating the formation of pure inorganic oxide.…”
Section: Resultsmentioning
confidence: 74%
“…The exothermic peaks at about 482, 520, and 635 °C in the DTA curve were thought to be due to the continue decomposition of zinc acetate and release of the oxidation of carbon and carbon monoxide from PAN and PVP. 28,30 All the above DTA analyses could be…”
In this work, ZnO hollow nanofibers with diameters of 120-150 nm were successfully fabricated by electrospinning the precursor solution consisting of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP), and zinc acetate composite through a facile single capillary, followed by thermal decomposition for removal of the above polymers from the precursor fibers. The as-prepared nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), resonant Raman spectra, thermal gravimetric and differential thermal analysis (TG-DTA), and Fourier transform infrared spectroscopy (FT-IR) spectra, respectively. The results indicated that, during the electrospinning process, there occurred phase separation between the electrospun composite materials, while the obtained precursor nanofibers of PAN, PVP, and zinc acetate composite might possess a core-shell structure (PAN as the core and PVP/zinc acetate composite as the shell). Furthermore, the composite nanofibers with core/shell structure could play a structural directing template role for preparing ZnO hollow nanofibers during the calcination process. The ZnO hollow nanofibers exhibited excellent sensing properties against ethanol due to their special one-dimensional nanostructural properties.
“…As a result, the peak at around 389 °C could consist of decomposition of acetate, PVP, and cyclization of PAN. The exothermic peaks at about 482, 520, and 635 °C in the DTA curve were thought to be due to the continue decomposition of zinc acetate and release of the oxidation of carbon and carbon monoxide from PAN and PVP. , All the above DTA analyses could be confirmed by a dramatic weight loss in the TG curve at the corresponding temperature range from 50 to 650 °C. After 650 °C there was no change in weight loss, indicating the formation of pure inorganic oxide.…”
Section: Resultsmentioning
confidence: 74%
“…The exothermic peaks at about 482, 520, and 635 °C in the DTA curve were thought to be due to the continue decomposition of zinc acetate and release of the oxidation of carbon and carbon monoxide from PAN and PVP. 28,30 All the above DTA analyses could be…”
In this work, ZnO hollow nanofibers with diameters of 120-150 nm were successfully fabricated by electrospinning the precursor solution consisting of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP), and zinc acetate composite through a facile single capillary, followed by thermal decomposition for removal of the above polymers from the precursor fibers. The as-prepared nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), resonant Raman spectra, thermal gravimetric and differential thermal analysis (TG-DTA), and Fourier transform infrared spectroscopy (FT-IR) spectra, respectively. The results indicated that, during the electrospinning process, there occurred phase separation between the electrospun composite materials, while the obtained precursor nanofibers of PAN, PVP, and zinc acetate composite might possess a core-shell structure (PAN as the core and PVP/zinc acetate composite as the shell). Furthermore, the composite nanofibers with core/shell structure could play a structural directing template role for preparing ZnO hollow nanofibers during the calcination process. The ZnO hollow nanofibers exhibited excellent sensing properties against ethanol due to their special one-dimensional nanostructural properties.
“…When diameters of the electrospun fibers are lessened from micrometers to sub-micrometers or nanometers, there appear some amazing characteristics such as very large surface area to volume ratio, flexibility in surface functionality, and superior mechanical performance [4]. Subsequently, inorganic nanofibers can be produced by the calcination of inorganic material-polymer electrospun fibers obtained by electrospinning of the sol-gel solution [6].…”
“…The formation of the anatase phase of TiO 2 began at a temperature of 475 °C. The phase transformation from the anatase phase to the rutile phase was completed for temperatures above 525 °C [ 10 , 11 ]. Fig.…”
Titanium dioxide (TiO2) is one of the most common photocatalysts. In this study, TiO2-vermiculite composite nanofibers with a mesh structure and a diameter of approximately 300 nm were prepared via sol–gel approach combined with electrospinning technique. The samples were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet–visible spectroscopy, etc. The photocatalytic property was also evaluated. The TiO2-vermiculite composite nanofibers annealed at 550 °C for 3 h exhibited the best absorption and photo-degradation ability for the treatment of methylene blue. The results implied that the combination of mineral vermiculite powders with TiO2 enhanced the absorption-degradation performance of the as-prepared photocatalytic materials, consequently promoting the materials’ ability to degrade methylene blue.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0977-1) contains supplementary material, which is available to authorized users.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
