during synthesis urea was incorporated as nitrogen source and hydrothermal reaction was applied between precursors.
Yes it will definitely show the percentage of nitrogen!!
Yes it should show the nitrogen spectral peak in EDX.
please see these papers they will definitely help.
http://pubs.rsc.org/en/content/articlehtml/2014/cc/c4cc00885e
Article Electrical and optical properties of p-type codoped ZnO thin...
yes, with out nitrogen it is not n-doped graphene
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