Synthesis and Characterization of Oxygen Vacancy Induced Narrow Bandgap Tungsten Oxide (WO3-x) Nanoparticles by Plasma Discharge in Liquid and Its Photocatalytic Activity

被引：112

作者：

Boruah, Palash Jyoti ^{[1
]}

Khanikar, Rakesh Ruchel ^{[1
]}

Bailung, H. ^{[1
]}

机构：

[1] Inst Adv Study Sci & Technol, Phys Sci Div, Plasma Applicat Lab, Garchuk 781035, Guwahati, India

来源：

PLASMA CHEMISTRY AND PLASMA PROCESSING | 2020年 / 40卷 / 04期

关键词：

In-liquid plasma; Nanoparticles; Oxygen vacancy; Narrow bandgap; Photocatalytic efficiency; ARC-DISCHARGE; ELECTROCHEMICAL PERFORMANCE; ELECTRICAL DISCHARGES; GOLD NANOPARTICLES; AMORPHOUS WO3; PARTICLE-SIZE; SILVER; TRANSITION; TRIOXIDE; FABRICATION;

D O I：

10.1007/s11090-020-10073-3

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Narrow bandgap tungsten oxide (WO3-x) nanoparticles have been synthesized by single-step plasma discharge in deionized water between two vertically pointed tungsten electrodes. Bombardment of energetic electrons on the as-formed nanoparticles in the plasma zone creates defect states. Formation of electron-rich oxygen vacancies on the crystal planes and grain boundary defects have been investigated. The peak shift and broadening in the Raman and FTIR spectra indicate the formation of oxygen vacancies and sub-stoichiometric WO3 nanoparticles. EDX analysis provides the ratio of tungsten to oxygen to be around 1:2.4. Optical bandgap has been found to be 2.15 eV, which is less than the bulk value of 2.54 eV. Observation of higher amount of defect states from TEM and XPS provides the reason for the formation of narrow bandgap tungsten oxide nanoparticles. The photocatalytic efficiency of the plasma synthesize WO3-x nanoparticles is found to be higher than that of commercial bulk and nano WO3 particles.

引用

页码：1019 / 1036

页数：18

共 77 条

[1] Pristine simple oxides as visible light driven photocatalysts: Highly efficient decomposition of organic compounds over platinum-loaded tungsten oxide [J].