I tried following process
A mixture of 0.48 g of sodium tungsten dehydrate was dissolved in 10 mL of deionized water under magnetic stirring for 30 min. Then, 20 wt% thiourea , and 2.5 mL of hydroxylamine hydrochloride were added to the resultant solution and heated at 90 0C under continuous stirring for 2 h. The pH value of above solution was adjusted to 8 by adding of HCl and constant stirring for 1 h. Then the above solution transferred into a 50mL Teflon-lined stainless steel autoclave, sealed and maintained at 180 0C for 12 h.
I tried some more processes by using these three precursors. but unable to get black color precipitates. I can only yellow color solution.
Dear Parul Duhan thank you for your very interesting technical question. Please have a look at the answers to the following closely related RG thread which might help you in your analysis:
What's the problem for my WS2 hydrothermal synthesis?
https://www.researchgate.net/post/Whats-the-problem-for-my-WS2-hydrothermal-synthesis
(13 answers)
Please also see the following potentially useful article:
Surfactant-assisted hydrothermal synthesis and characterization of WS2 nanorods
Article Surfactant-assisted hydrothermal synthesis and characterizat...
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