Biominerals doped nanocrystalline nickel oxide as efficient humidity sensor: A green approach

- A new resistive type of sensor was prepared by green synthesis.
- The mineral oxide from seed part of Hygrophila spinosa T. Anders (HST) plant is chosen as a dopant in NiO.
- The HST plant is found abundantly and commercially available in many countries.
- The band gap of NH2 (Ni:HST of 0.5:0.5 weight ratio) sample is greater than prepared bulk NiO due to quantum effects.
- The NH2 sample shows remarkable changes in the humidity sensing properties.