Identifying the Issue
- Existing sensors based on metal oxide semiconductors are limited by high temperature operation, response to different gases (poor selectivity) and non-flexible nature
- In this aspect, hydrogels with their interesting physical and chemical properties have attracted in designing the flexible sensors
Objective of the Research
Study the hybrid hydrogels to design gas sensors and tune the properties to high selectivity, with enhanced response for wearable applications
Who should read this?
- Research community working on gas sensors, hydrogels, flexible electronics.
- Industrial safety experts, and pharmaceutical industry.
Solution
Room temperature operable, flexible hydrogels which are selective to particular target gas interactions. Investigate hybrid hydrogel networks films to enhance the selectivity and sensitivity.
Key Features and Benefits
- hybrid hydrogel system formed by Laponite (a synthetic nanoclay) and Sodium Alginate (a natural polyelectrolyte) over the flexible polyethylene terephthalate (PET) substrates
- Have shown enhanced response with high selectivity towards ammonia gas sensing
- Ammonia interacts through ionization, thus forming NH4+, which causes releasing of Na+ ions in the hydrogel network. This differs from other gases and has resulted in high ammonia selectivity and an enhanced response
- Robust performance under humidity, ensuring stability.
- Suitable for wearable/health-related applications.
Impact
- Achieved a low detection limit of 7 ppm, making it suitable for environmental and biomedical monitoring.
- Rapid response (31 s) and recovery (84 s) at 1000 ppm.
- The sensing mechanism based on ion-exchange interactions between Na⁺ in the hydrogel and NH₄⁺ which is unique to ammonia with these hybrid hydrogels.
Team
- Tanay Saha (first author) (SSSIHL)
- Paramesh Gadige (Corresponding author) (SSSIHL)
Title of paper: “Highly selective ammonia gas sensing response by hybrid Laponite-sodium alginate hydrogel films on flexible substrates“
Read Paper Here: https://doi.org/10.1016/j.microc.2025.115423