A Bioinspired Adhesive-Integrated-Agent Strategy for Constructing Robust Gas-Sensing Arrays.

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Organic molecule-based gas sensors offer tunable properties but suffer from poor adhesion to substrates, limiting their use in demanding environments.
• Existing gas sensors often fail under mechanical stress or harsh conditions due to weak interfacial interactions between sensing materials and supports.

Purpose of the Study:

• To develop a novel strategy for creating robust and sensitive gas sensors with enhanced interfacial adhesion.
• To integrate adhesive and sensing units into a single chemical entity for improved sensor performance and durability.

Main Methods:

• An adhesive-integrated-agent strategy was employed, combining poly(dimethylsiloxane) (adhesive unit) with organoplatinum(II) (sensing unit).
• Nanobelt array gas sensors were fabricated using this integrated approach.
• Theoretical and experimental studies were conducted to evaluate interfacial adhesion and gas-sensing performance.

Main Results:

• The integration of adhesive units significantly improved the interfacial adhesion of the nanobelt array gas sensors.
• Gas-bridged super-exchange electronic couplings ensured efficient gas-sensing performance.
• The sensors demonstrated high shear strength (≈7.05 × 10⁶ N m^-2) and maintained performance under ultrasonication, tape peeling, and repeated bending.

Conclusions:

• The adhesive-integrated-agent strategy successfully created robust and sensitive nanobelt array gas sensors.
• This molecular engineering approach overcomes the limitation of weak interfacial adhesion in organic gas sensors.
• The developed strategy provides a new guideline for designing durable gas sensors for practical applications, even in harsh environments.