Recent advances in chemiresistive gas sensor for acetone detection: Focus on room temperature

Abstract

Acetone is a harmful volatile organic compound and a key biomarker for metabolic health. Room temperature (RT) gas sensors have the characteristics of low power consumption, high safety, and easy integration, making them an ideal choice for building non-invasive acetone monitoring. With AI and Internet of Things advancements, RT acetone sensors, especially those with miniaturized and wearable features, are expected to gain significant future interest. This review systematically summarizes the possible sensing mechanisms (oxygen species adsorption, direct electron transfer and electron scattering effects) and internal/external influencing factors of acetone sensors at RT. The different types of materials for RT acetone detection are classified. Besides, the state-of-the-art portable/wearable sensing devices for RT acetone detection are presented. Finally, the challenges that must be solved in the move to the continuous development of RT gas sensors are clearly discussed.