Synthesis of WS2 and WSe2 nanowires on stainless steel coupon by reaction under autogenic pressure at elevated temperature method

Abstract

The novel flower-like WE2 (E = S or Se) nanoflakes are synthesized and the growth of WS2 and WSe2 nanowires on stain less steel coupons (SSC) is observed by reaction under autogenic pressure at elevated temperature technique between the metallic tungsten and chalcogen powders at 750 °C for 3 h. Powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy are used to characterize all reaction products, viz., neat WS2, WSe2 powder, WS2/SSC and WSe2/SSC (stainless steel coupon). The photoluminescence spectrum of WS2 and WSe2 samples are also reported. In addition, the direct use of metals as precursors will devoid the harmful effects of organometallic precursor.