You can get only images of your sample by SEM but can not conclude about the behavior. So you have to go for XRD for the phase analysis as well to find that it is amorphous or what kind of nature? To check the bonding behavior of carbon, go for XPS characterization. In all these characterization, you can get sufficient information as you desired. 

Hi 

Dear yea sure you will get good results from XRD and SEM but if you can manage go for FT-IR and BET as well. Moreover if you want any activation especially chemical activation than after activation u have to do FT-IR as well but minimum you need 3 characterization i.e. FT-IR, XRD and SEM.

FTIR gives the structural behaviour and XRD gives the crystal structure and SEM give surface morphology.

I think BET is one of the most important parameter to evaluate the property of AC

Dear Bhanupriya Mordhiya,

You research focused on activated carbon from waste plant material, I suggest, the activated carbon should be characterized for surface area, pore volume and pore size distribution by BET surface area analysis, than FT-IR (oxygenated functional groups such as –COOH, –OH and CQO on the surface of activated carbon). XRD analysis (graphite-like or amorphous nature). If possible, better XPS analysis clearly indicate the carbon was bonded with functional groups such as epoxide, hydroxyl, ester/carboxyl group etc., 

You can get only images of your sample by SEM but can not conclude about the behavior. So you have to go for XRD for the phase analysis as well to find that it is amorphous or what kind of nature? To check the bonding behavior of carbon, go for XPS characterization. In all these characterization, you can get sufficient information as you desired.