Hi everyone
For ZnS - GO synthesize, at first the synthesized GO was mixed with zinc acetate dehydrate which was earlier dissolved in DI water. Then the solution pH was adjusted to 9 by adding ammonia solution. Subsequently, in the above mixture of sodium sulfide dissolved in DI water was added. After ultrasonicating the mixture it was transferred into a autoclave. The prepared mixture was kept in a sealed autoclave at 140 oC for 8 h which yielded a black (gray) composite. The product was further washed and then dried at 120 oC for 24 h. Unfortunately in XRD patterns, results only demonstrate the ZnO-GO nanocomposite structure instead of ZnS-GO nanocomposite.
Can anybody improve our method to reach ZnS-GO?
Hi Kasra Behzad
Please use a vacuum oven to dry the final product. In presence of air, the areal oxidation may take place to oxide the whole product to the oxide form. This can be the probable reason from the best of my knowledge. You may also collect the sulfide-treated sonicated mixture for EDS analysis to ensure that the incorporation of sulfide also. I can say the above from my side.
Regards
Dear Kasra,
I agree with Arnab Mukherjee in that air oxidation of your ZnS - GO nanocomposite must have taken place. As an alternative route you can try the method outlined for ZnS NPs@RGO in the article cited below. In this study, the authors avoid the step of heating the product in an autoclave. Instead, after ultrasonication the ZnS NPs/RGO nanocomposite is calcinated directly:
Layered nanocomposite of zinc sulfide covered reduced graphene oxide and their implications for electrocatalytic applications
Article Layered Nanocomposite of Zinc Sulfide Covered Reduced Graphe...
Also please have a look at the following potentially useful article:
Sonochemical synthesis of reduced graphene oxide uniformly decorated with hierarchical ZnS nanospheres and its enhanced photocatalytic activities
https://pubs.rsc.org/en/content/articlelanding/2015/ra/c4ra14775h
This paper describes an alternative route which involves simple ultrasonic irradiation of aqueous solutions of zinc acetate dihydrate, thioacetamide , and GO.
Good luck with your work!
Dear Kasra
Please the method discussed in the following paper.
https://doi.org/10.1155/2013/351798
I don't ZnS is readily converted to ZnO, perhaps you haven't made the ZnS at the beginning.
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