April 15, 2021

Scientists have developed an electronic nose with biodegradable polymer and monomer that can detect hydrogen sulphide (H2S), a poisonous, corrosive, and flammable gas produced from swamps and sewers.


  • H2S is the primary gas produced from the microbial breakdown of organic matter in the absence of oxygen, and this necessitates easy detection of its emission from sewers and swamps.

  • Responding to this challenge, scientists from the Centre for Nano and Soft Matter Sciences (CeNS), Bangalore, an autonomous institute of the DST have developed an exceptionally sensitive and selective H2S Gas sensor developed by impersonating the neuron responsible for identification of airborne molecules or olfactory receptor neuron (ORN).

  • The fabricated sensor consists of a heterostructure consisting of two layers –
    • the top layer a monomer and is realized with a novel chemical tris (keto-hydrazone), which is both porous and contains H2S specific functional groups, and

    • the bottom layer is the active channel layer which plays a key role in altering the current and mobility of charge carriers.

Source : PIB