Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular...

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Volatile organic compounds (VOCs) pose risks to health and the environment.
• Existing methods for VOC detection often lack selectivity and sensitivity.
• Integrated microfabricated sensor arrays offer potential for advanced chemical sensing.

Purpose of the Study:

• To develop a highly selective and sensitive e-nose for VOC detection.
• To utilize supramolecular monolayers for enhanced VOC recognition.
• To establish a multiparameter fingerprinting method for VOC discrimination.

Main Methods:

• Fabrication of an e-nose sensor array with supramolecular monolayers (Calix[8]arene, Porphyrin, β-CD, CB[8]) using Langmuir-Blodgett techniques.
• Employment of ultrahigh frequency film bulk acoustic resonator (FBAR) transducers for sensitive monolayer gas sensing.
• Analysis of VOC adsorption isotherms and kinetics to derive affinity and rate constants.

Main Results:

• Demonstrated high sensitivity of FBAR transducers for monolayer gas sensing.
• Obtained two affinity constants (K1, K2) and adsorption/desorption rate constants (ka, kd) for VOCs.
• Developed a five-parameter sensing matrix (Δf, K1, K2, ka, kd) for multiparameter fingerprinting.

Conclusions:

• The developed e-nose with supramolecular monolayers provides a highly selective and sensitive platform for VOC detection.
• Multiparameter fingerprint patterns derived from adsorption behaviors significantly enhance VOC discrimination capabilities.
• This approach holds promise for advanced applications in environmental monitoring and diagnostics.