If the herb you are interested in, for instance has antibacterial activity, one study could be supporting the herb on a proper nanomayerial and invistigate its antibacterial activity in this form

You can also study its release in vitro.

The most common method usually used these these synthesis of certain material using green synthesis using Sol gel, coprecipitation or hydrothermal synthesis.

Certain green herbs are used like garlic neem Tulsi etc.

Hi @ Omar Al-Obaidi

You may use the plant extract for the synthesis of some metal nanoparticles or metal based nanoparticles for the catalytic and antibacterial activities. You may follow the paper doi.org/10.1016/j.tibtech.2013.01.003

I recommend Abhishek Katoch and Mohammad Kooti

Medicinal herbs are powerful reducing as well as stabilizing agent for green synthesis of nanoparticle.