Facile Synthesis of Uniform Tungsten Oxide Nanorods in Large Scale

Abstract

The uniform tungsten oxide nanorods have been synthesized in large scale simply by heating a treated foil of tungsten. The diameter of the nanorods ranged from 100 to 300 nm and the length was up to 10 μm.

Growth of uniform tungsten oxide nanowires with small diameter via a two-step heating process

“…It was confirmed that no tungsten nanowires were formed at reaction temperatures below 550 1C, which is in agreement with the previous report with K 2 SO 4 as catalyst [12]. At the high temperature end, we found that the nanowires can be synthesized at 790 1C, which is much higher than the upper limit of 690 1C reported.…”

“…Many synthetic methodologies have been devoted to the growth of nano-scaled tungsten oxide [8][9][10][11][12]. A primary method is to heat a tungsten foil at a high temperature with different chemicals as catalysts, for example at 1600 1C with SiO 2 plate in an argon atmosphere [8], at 1600 1C with B 2 O 3 powders in a nitrogen atmosphere [9] and at 1400 1C with WS 2 powders in an argon (490 Torr) and oxygen (10 Torr) atmosphere [10].…”

A simple method to synthesize single-crystalline β-wollastonite nanowires

“…The larger particles grew at the cost of the small particles; reduction in surface energy is the primary driving force for crystal growth and morphology evolution, due to the difference in solubility between the larger particles and the small particles, according to the well-known Gibbs-Thomson law. As the reaction continued, the irregular nanoparticles vanished and longer nanowires formed [19][20][21][22][23]. After calcination at 800 1C for 2 h, the phase of the powders transformed from xonotlite to b-CaSiO 3 , which was identified by XRD (Fig.…”

The synergistic effect between WO3 and g-C3N4 towards efficient visible-light-driven photocatalytic performance

“…Tungsten trioxide (WO 3 ), a transition metal oxide semiconductor with a band gap of 2.6-2.8 eV, has been introduced as an alternative photocatalyst with a lot of potential applications such as a visible-light-driven photocatalyst and related technological applications. [9][10][11][12][13] However, it has been observed that under visible light it shows a limited catalytic activity because its conduction band edge lies in a position not favourable for single-electron reduction of O 2 which makes it a less efficient photocatalyst for organic degradation. 14 On the other hand, graphite-like carbon nitride (g-C 3 N 4 ), [15][16][17] a metal free and nontoxic material, has emerged as one of the promising candidates for photocatalysis especially after the report of Wang et al 18 Although g-C 3 N 4 has shown a great potential for catalytic activities, but its small surface area and the high recombination rate of photogenerated electron-hole pairs are the factors that limit its performance.…”