Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras

Polymeric Sensor Device for Vapor Sensing, Method of Sensing and Method of Preparation thereof

Technology Category/ Market

Category – Advanced materials

Applications –Sensors , semiconductors, protective coatings, Solar batteries, capacitors piezoelectric devices, optoelectronics

Industry – Semiconductors,Advanced materials 

Market -The Advanced Materials Market size was estimated at USD 73.78 billion in 2022 and expected to reach USD 78.25 billion in 2023, at a CAGR 6.19% to reach USD 119.35 billion by 2030.

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Problem Statement

  • The demand for highly sensitive sensors capable of detecting various chemical species, especially in the form of chemical vapors or gases, has been growing rapidly.
  • Conducting polymers that are commercially available have shown promise in vapor sensing due to their facile low-temperature processing but have limitations in terms of limited sensitivity, long  response time and recovery time , use of noble metals with high manufacturing costs  and complexity


The present invention disclose a  sensor for sensing a species comprising:

  • The said conductive polymer has an electrical conductivity in the range of of 10-3 to 105 S/cm
  • Conductive Polymer includes PEDOT:PSS, PEDOT:PSS composites, polyaniline (PANI), or polypyrrole (PPy).
  • Substrate Material include Non-conductive materials such   as  PDMS, PET, SEBS, or rubber.
  • Film thickness is 10 nm to 10 µm, further crack depth engineered is in the range of the film thickness
  • Further, the detection species include water vapor, steam or alcohol vapor.

Key Features/ Value Proposition

Technical Perspective:

  • Achieving high sensitive vapor sensors by using an electrically conducting polymer cast on flexible substrates
  • The film includes cracks configured to disrupt electrical flow across the polymer film
  • The cracks are nanostructured to impart a high electrical resistance to the sensor, and the sensor is configured to exhibit increase in conductance by a factor of at least 10 on exposure to the species to be detected.

User Perspective:

  • Nanostructured PEDOT:PSS thin film exhibited superior behavior to commercially used breath analyzer
  • Swelling of conducting polymer upon absorbing vapors restores the electrical conduction leading to high response resistive vapor sensing
  • The sensor may be used to detect alcohol vapors or humidity.
  • Cost effective, simple and can be used in flexible solar cells, flexible electrodes, flexible displays and flexible interconnects

Questions about this Technology?

Contact for Licensing

Research Lab

Prof. Manu Jaiswal

Dillip Kumar Satapathy

Department of Physics

Intellectual Property

  • IITM IDF Ref. 1671
  • IN 471375-Granted

Technology Readiness Level

TRL- 4

Technology Validated in Lab

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