Optical properties of multilayer films of nanocomposites based on WS₂ nanotubes decorated with gold nanoparticles

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS2 Nanotubes

“…Average length and diameter of NT‐WS 2 were found to be 0.5–10 μm and 30–200 nm, respectively. The nanotubes were decorated with AuNPs by a direct interaction with HAuCl 4 solutions according to the facile technique developed in our previous studies . The technique was scaled up and slightly corrected to obtain the tens of milligrams quantity of Au‐NT‐WS 2 required for the suggested sensor test.…”

“…Multiwalled WS 2 nanotubes produced by NanoMaterials Ltd. (Israel) were used in this study.A verage length and diameter of NT-WS 2 were found to be 0.5-10 mma nd 30-200 nm, respectively.T he nanotubes were decorated with AuNPs by ad irect interaction with HAuCl 4 solutions according to the facile technique developed in our previous studies. [32,33] The technique was scaled up and slightly corrected to obtain the tens of milligrams quantity of Au-NT-WS 2 required for the suggested sensor test. Before the synthesis, commercial NT-WS 2 were deagglomerated in acetone.…”

“…Additionally, decoration with Ag nanowires significantly improved response and recovery of NO 2 sensors based on WS 2 nanosheets . Several nanocomposites based on NT‐WS 2 and noble metals, including gold and silver plasmonic nanoparticles, were reported, however their gas sensing properties have never been studied. Important information about surface features of NT‐WS 2 ‐based nanocomposites is rather limited, while it is the key issue in understanding the sensing mechanisms of such materials.…”

“…[30,31] Additionally,d ecoration with Ag nanowires significantly improved response and recovery of NO 2 sensors based on WS 2 nanosheets. [1] Severaln anocomposites based on NT-WS 2 and noble metals, including gold and silver plasmonic nanoparticles, were reported, [32][33][34][35][36][37][38] however their gas sensing properties have never been studied.I mportant information about surface features of NT-WS 2 -based nanocomposites is ratherl imited, whilei ti sthe key issue in understandingt he sensing mechanisms of such materials. To date, only af ew Xray photoelectron spectroscopy (XPS) studies of core levels in Pd-NT-WS 2 nanocomposites, [34] W 18 O 49 -filled NT-WS 2 , [39] and WS 2(1Àx) Se 2x nanotubes [40] were performed.…”

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

“…and sacrificial layers [9], as well as spontaneous reduction of Ag + ions on the surface of CNT [30]. On the contrary, the functionalization of NT-WS 2 with plasmonic silver nanoparticles has not been studied yet, despite several attempts having been made to synthesize Au-NT-WS 2 nanocomposites [31][32][33][34]. Moreover, it was suggested in our previous work [32], which focused on the functionalization of NT-WS 2 with AuNPs via spontaneous HAuCl 4 reduction on the disulfide surface, that the same technique could be applied using AgNO 3 solutions for the production of Ag-NT-WS 2 nanocomposites.…”