Current topics are mostly about plant extracts now and silver nanoparticles are interested in these research papers. Becuse that plant extracts are easily obtained, researchers use these. However, there are complicated green synthesis methods such as bacteria and virus. But these methods are troublesome and time consuming. If you want to synthesis spherical nanomaterials via green synthesis aprroach, you can try these plant extracts. For synthesis nanorod or nanowire, then you must another green synthesis aproach as mentioned above (virus etc.)