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Planar miniature capacitors are the best powered device for flexible wearable electronic devices. However, a single capacitor has a small voltage window and a low energy density, making it difficult to continuously power the wearable device without interruption. The easiest way to solve this problem is to connect multiple microcapacitors in series to form an array to power the functional units of the wearable integrated system. So far, many different types of capacitor array driven integrated detection systems have been developed, but compared with light detection and pressure sensors, gas sensors have longer response time to target gas, and corresponding energy consumption is greater. The demand for energy devices is higher, making it more difficult to integrate. Therefore, the research on the integrated system of self-driven gas sensors is of great significance.
The integrated system consists of a circular capacitor array based on electrodeposited polypyrrole electrode material, a room temperature ethanol gas sensor based on carbon nanotube/polyaniline material, and an in-situ gas analysis and display system. The area ratio specific capacitance of the assembled capacitor is 47.42 mF/cm2, and the response time of the gas sensor to the ethanol gas at normal temperature is 13 s and 4.5 s, respectively. When a gas enters the sensor, the current on both sides of the gas sensor changes. The components in the board collect this change and calculate it. Compare it with the pre-stored standard curve to get the gas concentration value, and then pass the signal through Bluetooth. Transfer to the mobile phone, then the mobile phone APP will display the corresponding gas concentration and draw the real-time It curve, which has broad application prospects in the field of personalized drunk driving test.
The Institute of Semiconductors of the Chinese Academy of Sciences develops a new wearable gas sensor and real-time display system
The Shen Guozhen Group of the State Key Laboratory of Superlattice, Institute of Semiconductors, Chinese Academy of Sciences, has recently developed a new wearable gas sensor and real-time display system driven by a microcapacitor array. Related research results have been published in "Nano Energy".