Silicon MEMS Thermocatalytic Gas Sensor in Miniature Surface Mounted Device Form

Chemosensors

Csaba Ducso¹  Ferenc Biro¹  Pavel Dzhumaev²  Alexander Pisliakov²  Ivan Obraztsov²  Nikolay Samotaev²  Konstantin Oblov² 

[1] Centre for Energy Research, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary;MEPhI (Moscow Engineering Physics Institute), National Research Nuclear University, Kashirskoe Highway 31, 115409 Moscow, Russia;

关键词: surface mounted device;    silicon MEMS;    ceramic MEMS;    gas sensor;    flip-chip;   

DOI  :  10.3390/chemosensors9120340

来源: DOAJ

【 摘 要 】

A reduced size thermocatalytic gas sensor was developed for the detection of methane over the 20% of the explosive concentration. The sensor chip is formed from two membranes with a 150 µm diameter heated area in their centers and covered with highly dispersed nano-sized catalyst and inert reference, respectively. The power dissipation of the chip is well below 70 mW at the 530 °C maximum operation temperature. The chip is mounted in a novel surface mounted metal-ceramic sensor package in the form-factor of SOT-89. The sensitivity of the device is 10 mV/v%, whereas the response and recovery times without the additional carbon filter over the chip are <500 ms and <2 s, respectively. The tests have shown the reliability of the new design concerning the hotplate stability and massive encapsulation, but the high degradation rate of the catalyst coupled with its modest chemical power limits the use of the sensor only in pulsed mode of operation. The optimized pulsed mode reduces the average power consumption below 2 mW.

【 授权许可】

Unknown