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Micro-machined resistive micro-heaters for high temperature gas sensing applications

Micro-machined resistive micro-heaters for high temperature gas sensing applications

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Presented for the first time is the design and fabrication of novel high temperature, low power consumption, and good thermal uniformity micro-heaters for environmental gas sensors. A O/N/O (SiO2/SixNy/SiO2) structure of membrane was used for stress compensation and thermal isolation. A Wheatstone-bridge type resistive Pt heating structure and a multi-ringed heat spreading structure was applied to enhance the thermal uniformity. Results show that these fabricated heaters can operate at a high temperature, have low power consumption and good thermal uniformity. The thermal efficiency of the fabricated micro-heaters is 36°C/mW.

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