This method has attracted extensive attention because this sensor type’s advantages include high monitoring sensitivity, light weight, good flexibility, and designability 22, 23. Among these methods, the development of chemiresistor gas sensors on flexible substrates using inkjet printing is becoming an important research area 20, 21. Common sensing layer fabrication methods include drop coating 16, spin coating 17, screen printing 18, and inkjet printing 19. A basic chemiresistor gas sensor comprises a set of interdigital electrodes and a sensing layer that covers the electrodes 14, 15. The gas can then be detected by measuring the sensing material resistance. Their working principle is that when the target gas exists, it can then interact with the sensing material through covalent bonding, hydrogen bonds, or molecular recognition, causing the sensing material’s resistance to change 13. Recently, sensors including localized surface plasmon resonance (LSPR) sensors 8, quartz crystal microbalance (QCM) sensors 9, surface acoustic wave sensors 10, and metal oxide sensors 11, were developed for VOC detection.Ĭhemiresistor-type gas sensors have been widely investigated and used to detect VOCs because of advantages that include cost-effectiveness, a simple sensing mechanism, and easy integration 12. However, because of the disadvantages of GC-MS, e.g., high cost, large volume, and non-real-time analysis, it is necessary to develop sensors to detect organic compounds. Traditionally, VOCs have been analyzed via the gas chromatography-mass spectrometry (GC-MS) method 7. Therefore, simple but effective VOC monitoring method development, particularly for room temperature VOC monitoring, is important for fields including air quality monitoring, human health monitoring, and medical diagnosis. The production of these VOCs is related to gender, age, genetics, physiological state, and eating habits 5, 6. In addition, the skin and parts of the human body also produce some VOCs 4. Long-term exposure to air-containing VOCs will have adverse effects on human health and may cause so-called sick building syndrome 2, 3. Volatile organic compounds (VOCs) exist in the air in indoor and outdoor environments 1.
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