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Highly sensitive, flexible and biocompatible temperature sensor utilizing ultra-long Au@AgNW-based polymeric
Amit Kumar1, Muhammad Omar Shaikh2, R K Rakesh Kumar1
1Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. chchuang@imst.nsysu.edu.tw.
Nanoscale
|January 11, 2022
Summary
We developed a flexible, biocompatible temperature sensor using gold-silver core-shell nanowires (Au@AgNWs) in a polymer. This wearable sensor offers high resolution and a quick response time for electronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Polymeric nanocomposites with conductive fillers are promising for bioelectronics and wearable devices due to their sensitivity, stretchability, flexibility, and conductivity.
- Developing flexible, biocompatible, and high-resolution sensors is crucial for advancing wearable technology.
Purpose of the Study:
- To develop a flexible and biocompatible polymeric nanocomposite for a high-resolution wearable temperature sensor.
- To synthesize and characterize ultra-long silver-gold core-shell nanowires (Au@AgNWs) for enhanced properties.
- To investigate a novel temperature sensing mechanism in the fabricated nanocomposite.
Main Methods:
- Synthesis of ultra-long silver nanowires (AgNWs) via a polyol process, followed by gold (Au) coating to form Au@AgNWs.
- Characterization of Au@AgNWs using HRTEM and EDS, and assessment of biocompatibility and anti-oxidative properties.
- Fabrication of a nanocomposite ink (Au@AgNW-poly-ethylene glycol-polyurethane) and printing onto interdigitated electrodes to create a thermoresistive temperature sensor.
Main Results:
- Successfully synthesized ultra-long AgNWs (aspect ratio ~1500) and coated them with a gold layer, forming Au@AgNWs with enhanced biocompatibility and anti-oxidative properties.
- Developed a printable nanocomposite ink (Au@AgNW-PEG-PU) for fabricating flexible, biocompatible temperature sensors.
- Demonstrated a novel negative temperature coefficient (NTC) sensing mechanism based on the glass transition of thermosensitive polyethylene glycol (PEG) controlling nanowire percolation.
Conclusions:
- The developed Au@AgNW-PEG-PU nanocomposite is a promising material for high-resolution, flexible, and biocompatible wearable temperature sensors.
- The novel sensing mechanism offers a new pathway for designing advanced thermoresistive sensors.
- The printable nature of the sensor expands its potential for various wearable electronic applications.
