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Raman and SEM Characterization of Electrospun WO_3 Nanofibers
並列摘要
This article reports how the significant it is to recognize the optimal annealing circumstances when electrospun composite fibers are heated to obtain ceramic nanofibers in proper characteristics. Polyvinylpyrrolidone (PVP) and ammonium metatungstate (AMT) nanoscaled fibers have been synthesized by electrospinning aqueous solutions of PVP and AMT. The as-spun fibers and their annealing were studied by scanning electron microscope (SEM) and Raman measurements. The 500-600 nm thick and tens of micrometer long PVP/AMT nanoscaled fibers, and pure monoclinic WO_3 nanoscaled fibers formed between 500 and 600 ℃. When a high heating temperature (more than 700℃) was used, the tungsten oxide nanofibers totally disintegrated. When heated at 600℃, the fibers broke into rods. However, when the annealing temperature was low (500℃), the nanoscaled fibers morphology was excellent with more crystalline. When the optimal temperature was used, WO_3 nanoscaled fibers with unique morphology and crystallinity were captured. The Raman measurements proved that which this heating parameter the organic matter was completely extracted from the nanoscaled fibers and WO_3 Keywords was existing in highly crystalline and ordered form. By Raman scattering investigates we discovered that the films contain hydrates.