Formation of niobium oxide and carbide nanofibers from poly(vinyl alcohol)/niobium oxide composite nanofibers

Abstract

Poly(vinyl alcohol)-niobium oxide (Nb 2 O 5 ) composite nanofibers (precursors) were formed by electrospinning employing water as a solvent for the spinning solution. The precursors were converted into Nb 2 O 5 or carbide (NbC) nanofibers by heating them in air or Ar. Hexagonal Nb 2 O 5 nanofibers with high-specific surface area were obtained by heat-treatment of the precursors in air. NbC nanofibers could be obtained below theoretical temperatures calculated from thermodynamics data, indicating that the precursor is a nano-scale mixture of Nb and carbon sources.

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

“…Subsequently, the solution was subjected to the electrospinning method in fixed conditions: ejection rate of 0.7 mLh −1 , work distance of 10 cm, and electrical voltage of 20 kV. Finally, the obtained fibers were subjected to thermal treatment based on the literature [24], varying the temperature from 400 • C to 900 • C for 2 h, and a heating rate of 1 or 10 • C min −1 .…”

Electrospinning of ultrafine metal oxide/carbon and metal carbide/carbon nanocomposite fibers

“…Mixing pre-existing niobium oxide nanoparticles with poly(vinyl alcohol) (PVA) with niobia, niobium carbide bers have been produced by electrospinning. 26 A thermal treatment at 1500 C produces NbC bers of about 110 nm diameter and a low surface area (4 m 2 g À1 ) by annealing at 800 C was observed. The synthesis of ultrane Nb 2 O 5 bers by sol gel and electrospinning has been reported by mixing niobium n-butoxide 27 or niobium ethoxide 28 with a dissolved carrier polymer and an acid catalyst.…”

Hybrid composite material based on polythiophene derivative nanofibers modified with gold nanoparticles for optoelectronics applications

“…The development of novel polymer materials using special monomers (homopolymers and copolymers) or the combination of different polymers (blends), associated techniques that allow the processing of these materials in the micro-or nanoscale are highly pursued. Such materials can reach final optical and electrical properties highly suitable for technological applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. In this context, the electrospinning technique has great potential since it allows the fabrication of polymeric micro-and nanofibers with controlled diameter and morphology [14][15][16][17][18].…”