Improved synthesis of WS <sub>2</sub> nanotubes with relatively small diameters by tuning sulfurization timing and reaction temperature
Md. Ashiqur Rahman, Yohei Yomogida, Mai Nagano, Ryoga Tanaka, Yasumitsu Miyata, Kazuhiro Yanagi
Abstract
Abstract Improvement of synthesis techniques of tungsten disulfide (WS 2 ) nanotubes is of great importance for understanding of the physical properties of WS 2 nanotubes and their applications. Previously, relatively small diameter WS 2 nanotubes were synthesized using solvothermally synthesized nanowires as precursors. The obtained samples exhibited relatively uniform nanotube structures, but in the samples, there were a lot of degraded nanoparticles and nanoflakes as by-products. Here, we demonstrate that such by-products can be well removed by tuning the sulfurization timing and precise control of the reaction temperature. WS 2 nanotubes with relatively small diameters are well produced without such by-products.