Growth of Tungsten Oxide Nanorods with Carbon Caps

Abstract

Hybrid nanostructures consisting of tungsten oxide nanorods with mushroom-shaped carbon caps were grown on electrochemically etched tungsten tips by thermal chemical vapor deposition with methane and argon. These nanorods grow along the radial direction and are very straight and smooth. Electron microscopy revealed a dominant diameter and length of approximately 50 nm and approximately 0.6 microm, respectively. High-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS) revealed the presence of crystalline monoclinic W18O49 in the nanorods, and the cap was entirely amorphous carbon. A plausible growth mechanism involves the reduction of tungsten oxide WO3, present on the tungsten surface, by methane at 900 degrees C.

Less-Common Nanostructures in the Forms of Vegetation

“…Hybrid nanostructures consisting of tungsten oxide nanorods with mushroom-shaped carbon caps were grown on electrochemically etched tungsten tips by thermal CVD with methane and argon. 117 The presence of crystalline monoclinic W 18 O 49 in the nanorods and the cap consisting of entirely amorphous carbon was revealed and a growth mechanism was offered involving the reduction of tungsten oxide WO 3 , present on the tungsten surface, by methane at 900 °C. ZnO complex nanostructure with mushroom-like morphology was prepared by hydrolysis of Zn acetate dihydrate (Zn(AcO) 2 • 2H 2 O) in H 2 O-MeOH mixed solvent at 60 °C.…”

Synthesis, characterization and enhanced gas sensing performance of WO3 nanotube bundles

“…[15][16][17][18][19][20][21][22][23][24] Currently, using the above-mentioned approaches, various high-quality WO 3 nanostructures with different morphologies have been successfully fabricated, such as nanosheets, nanorods, nanotubes, nanoplates and nanotrees. [25][26][27][28][29][30][31][32][33][34] However, the successful synthesis of nanotube bundles with higher oxygen vacancies is difficult and remains a great challenge.…”