chemical synthesis of PVP capped silver nanoparticle using NaBH4 fallowed a procedure of Mirzaei etal 2017.
PVP(0.1%) was kept in magnetic stirrer till it dissolve and AgNO3 was added then it was left for 30minutes later to this mixture NaBH4 was added in drop wise.
ratio of NaBH4/AgNO3=0.7 and PVP 0.1% in 100ml of deionized water
the first two step in the synthesis and characterization was successful ie, while adding NaNH4 to PVP-AgNO3 solution color changed from colorless to yellow color and in UV VIS spec peak was shown at 405-409nm in every trails. the same solution was centrifuged at 12000rpm for 30min the obtained precipitate was freeze dried for first time. the dried sample was subjected to FE-SEM and PXRD in the both cases i did not got good results. i have attached images of FE-SEM please find the attachment. in PXRD for higher concentration around 2% of PVP got only two peaks.
to the same procedure for second time instead of freeze drier it was kept in oven at 60c for 4hours but there is no changes in results
i am expecting pvp capped spherical shape silver nanoparticle. what can do now?
Neither freeze drying nor heating is required. The centrifuged samples can be dried in a vacuum desiccator.
Dear all, after checking the montionned paper, the solutions of PVP and AgNO3 were prepared separatly before they were combined. 0.1% I think is too low (please make a re-check). In addition, is it the same MW of PVP as in the reference paper? The following documents are interesting to see. My Regards
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0186094
https://doi.org/10.1166/jnn.2010.1915
https://doi.org/10.1039/C5DT02964C
https://doi.org/10.1063/5.0019359
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395525/
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