Dear Yogendra Yadawa, it depends essentially on the polymer MW and the final properties. A lot of work was done on this binary system. Plrase check the following documents. My Regards

https://www.researchgate.net/publication/236965743_Luminescent_polyvinylpyrrolidoneZnO_hybrid_nanofibers_membrane_prepared_by_electrospinning

https://link.springer.com/article/10.1007/s10854-017-7688-6

https://doi.org/10.1016/B978-1-4557-3159-6.00013-4

https://link.springer.com/article/10.1007/s10854-017-7688-6?shared-article-renderer

https://doi.org/10.1080/01932690903212222

https://doi.org/10.1016/j.mssp.2015.08.003

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4049438/

https://doi.org/10.4028/www.scientific.net/MSF.888.309

Please check this manuscript. I hope it will help you to optimize the perfect concentration for your ZnO and PVP.

https://link.springer.com/article/10.1007/s10854-017-7688-6?shared-article-renderer

Do you mean stoichiometric proportion ? It will depend upon the aspect ratio of the fibers.