Fish Gelatin-based Films for Gas Sensing.

Area of Science:

• Materials Science
• Chemical Sensing
• Optoelectronics

Background:

• Electronic noses (e-noses) emulate biological olfaction using sensor arrays and pattern recognition.
• Existing e-nose technologies often require complex fabrication and may lack reusability.
• Development of novel, cost-effective, and sustainable sensing materials is crucial for artificial olfaction.

Purpose of the Study:

• To develop and characterize a new stimuli-responsive material for gas sensing applications.
• To evaluate the performance of this material in an in-house developed electronic nose system.
• To assess the potential of these materials for future optoelectronic and artificial olfaction devices.

Main Methods:

• Fabrication of gas-sensing films using self-assembled liquid crystal and ionic liquid droplets within a fish gelatin matrix.
• Utilizing an in-house developed e-nose to detect volatile organic compounds (VOCs) and record optical signals.
• Employing a support vector machine classifier with 12 signal features for pattern recognition and VOC identification.

Main Results:

• The developed films exhibit characteristic optical responses to VOCs from different chemical classes.
• High accuracy (95%) was achieved in identifying hydrocarbon VOCs (toluene, heptane, hexane).
• Overall VOC identification accuracy was 60.4%, with lower performance for non-hydrocarbon compounds.
• The sensing films demonstrated stability and reproducibility over time, despite not being reusable.

Conclusions:

• The novel fish gelatin-stabilized liquid crystal/ionic liquid films show promise as sustainable gas-sensing materials.
• These materials are effective for identifying specific VOCs, particularly hydrocarbons, in an e-nose system.
• The findings open avenues for developing new optoelectronic devices and artificial olfaction systems.