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A polyaniline-enhanced quartz crystal microbalance sensor for room-temperature camphor detection
Rizky Aflaha1, Muammar Romiz Dzaki2, Laila Katriani1,3
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, BLS 21, Yogyakarta 55281, Indonesia.
Analytical Methods : Advancing Methods and Applications
|December 18, 2024
Summary
Researchers developed a portable sensor for detecting camphor gas, crucial for the pharmaceutical industry. The new sensor, utilizing polyaniline on nanofibers with a quartz crystal microbalance, shows high sensitivity and selectivity.
Area of Science:
- Materials Science
- Chemical Sensors
- Analytical Chemistry
Background:
- Accurate camphor gas detection is vital in the pharmaceutical industry.
- Current detection methods like GC-MS are laboratory-bound and lack portability.
- There is a need for sensitive, selective, and portable camphor gas sensors.
Purpose of the Study:
- To develop a portable sensing system for camphor gas detection.
- To investigate the use of polyaniline (PANi) concentrations on PVAc nanofibers as an active layer for camphor sensing.
- To utilize a quartz crystal microbalance (QCM) system for measuring camphor exposure.
Main Methods:
- Fabrication of a sensor active layer using PVAc nanofibers coated with varying concentrations of polyaniline (PANi).
- Characterization of the nanofiber-PANi composite using Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared (FTIR) spectroscopy.
- Performance evaluation of the sensor using a Quartz Crystal Microbalance (QCM) system to measure sensitivity, selectivity, response/recovery times, and stability.
Main Results:
- The sensor with 0.08% PANi thin film (Nano-PANi8) exhibited a significantly higher sensitivity (2.594 Hz ppm-1) compared to the sensor without PANi (0.305 Hz ppm-1).
- The Nano-PANi8 sensor demonstrated excellent selectivity for camphor gas over other compounds, with rapid response (47 s) and recovery (133 s) times.
- The sensor maintained robust long-term stability over three weeks and proved to be portable due to the QCM base.
Conclusions:
- The developed QCM sensor with PANi thin film offers superior performance for camphor detection, characterized by excellent sensitivity, selectivity, and long-term stability.
- The integration of PANi on PVAc nanofibers enhances the sensor's ability to interact with camphor molecules.
- The QCM-based system provides a viable platform for a portable and effective camphor gas sensor for industrial applications.
