Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

Abstract

Tantalum pentoxide nanoparticles (Ta2O5 NPs) were fabricated by cathode glow discharge electrolysis (CGDE) generated between a needle-like platinum wire cathode and a tantalum foil anode in 6 g L−1 Na2SO4 electrolyte solution containing 5 mL hydrofluoric acid (HF) and 0.075 g cetyltrimethyl ammonium bromide (CTAB). The chemical structure, composition and morphology of the obtained powder were analyzed by using XRD, FT-IR, SEM/EDS, XPS and UV-vis DRS. The results found that Ta2O5 NPs with orthorhombic structure and wide band gap (3.6 eV) are successfully fabricated at 500 V discharge voltage in about 3 h. CTAB as a stabilizing agent can reduce the agglomeration due to forming CTA+ and attaching the surface of the synthetic products. A possible preparation mechanism of Ta2O5 NPs is proposed. Firstly, the tantalum foil anode is oxidized to form a compact Ta2O5 layer. Then, Ta2O5 surface is etched to form soluble [TaF7]2− complexes in the presence of HF. After that, soluble [TaF7]2− complexes can react with H2O to form Ta(OH)5. Finally, Ta(OH)5 is further converted to Ta2O5 from plasma-liquid interface into solution.

Submerged Discharges in Liquids for Nanoobject Synthesis: Expectations and Capabilities

“…The same group [126] suggested that adding CTAB only changes the growth pattern of Ta2O5 crystallites rather than influencing the composition of Ta2O5 nanoparticles using the same process. Musaka et al [52] demonstrated that the average diameter of tin nanoparticles produced by wire erosion was non-linearly dependent on the concentration of gelatin, used as a surfactant in water, with a minimum value at 2 mg/L.…”

Generation of High-Density Pulsed Gas–Liquid Discharge Plasma Using Floating Electrode Configuration at Atmospheric Pressure

“…Atmospheric pressure (AP) gas-liquid discharge plasma has been actively investigated for its promising application prospects in water purification [1][2][3], biomedicine [4][5][6], and materials processing [7][8][9]. However, random micro discharge channels occur easily which can lead to non-directed energy distribution leading to serious issues and adversely affecting industrial applications.…”