Details

Autor(en) / Beteiligte

• Muangban, J
• Jaroenapibal, P

Titel

EFFECTS OF PRECURSOR CONCENTRATION ON CRYSTALLINE MORPHOLOGIES AND PARTICLE SIZES OF ELECTROSPUN WO3 NANOFIBRES

Ist Teil von

• Ceramics international, 2014-01, Vol.40 (5), p.6759-6764

Erscheinungsjahr

2014

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Tungsten oxide (WO3) nanofibres, with different crystalline morphologies and particle sizes, were fabricated using an electrospinning technique. The nanofibres were prepared from mixtures of polyvinyl alcohol and ammonium metatungstate hydrate (AMH) with different concentrations ranging from 4.2 to 50.0% w/v. After calcination at 500 C for 2 h, the nanofibres had a monoclinic crystal structure with diameters ranging from 30 to 250 nm. The AMH concentration had an effect on the resulting nanofibre morphology, a low AMH concentration of 4.2% w/v resulted in WO3 nanofibres with a large monocrystalline structure. Higher AMH concentrations resulted in polycrystalline WO3 nanofibres with joined nanoparticles along the fibre axis. The average particle size within the nanofibres increased from 29 to 66 nm as the AMH concentration increased from 8.3 to 50% w/v. At these precursor concentration levels, primary particles were formed before PVA was completely burnt off, resulting in agglomeration of primary particles along the nanofibre axis.