Sign In
Learn bits
Science & Tech.
Pradeep Kumar

15/04/21 10:10 AM IST

New electronic nose

In news

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

Reason

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.

About the device
  • Scientists 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.
  • The bottom layer is the active channel layer which plays a key role in altering the current and mobility of charge carriers.
Functioning
  • The synergistic combination helps to pre-concentrate the H2S molecules, initiate an acid-base chemical reaction, and thereby brings a change in the majority carriers (holes) of the channel region in the device.
  • The capacitance sensor (a sensor that detects nearby objects by their effect on the electrical field created by the sensor) developed by the scientists showed an excellent sensitivity in detecting H2S gas with an experimental limit of detection of around 25 parts per billion.
  • It also has high ambient stability of around 8 months without compromising sensing performance.
Source: PIB

More Related Current Affairs View All

21 Aug

Promotion and Regulation of Online Gaming Bill, 2025

'The Lok Sabha recently passed the Promotion and Regulation of Online Gaming Bill 2025.' The bill encourages e-sports and online social games while prohibiting harmful online mo

Read More

21 Aug

Union Home and Cooperation Minister Shri Amit Shah introduces the Constitution (One Hundred and Thirtieth Amendment) Bill, 2025

'Union Home Minister and Minister of Cooperation, Shri Amit Shah  introduced the Constitution (One Hundred and Thirtieth Amendment) Bill, 2025, the Union Territories (Amendmen

Read More

20 Aug

How should toll collection practices be reformed?

'The Public Accounts Committee (PAC) of Parliament has proposed major changes to toll collection on national highways, including a recommendation to end the practice of perpetual t

Read More

India’s First Ai-Driven Magazine Generator

Generate Your Custom Current Affairs Magazine using our AI in just 3 steps