Colloidal quantum dots for low-power-consumption semiconductor gas sensors

Sep 12, 2019, 9:30 AM


Huan Liu


Gas sensors are becoming increasingly important to the safety and quality of human life. In the past decades, semiconductor gas sensors employing high-temperature ceramics technology have been intensively investigated and higher senstivity as well as selectivity have been achieved. Silicon-based micro-electro-mechanical system (MEMS) hotplates have also been utilized to reduce both the volume size and power consumption of semiconductor gas sensors. Collodial quantum dots (CQDs) possess highly sensitive and programmable surface, combined with excellent solution processability, which make them ideal building blocks for next-generation gas sensors compatible with silicon-based or flexible substrates. Through the controllable systhesis with surface and interface enginnering strategy of CQDs, we have demonstrated senstive and selectve semiconductor gas sensors with lower power cosumption based on metal sulfides [1,2] and oxides [3,4], respectively. In addtion to traditional rigid substrates including ceramics and Si-based MEMS hotplates, soft substrates being flexible and stretchable were sucssfully used for the CQD gas sensors, which may open up a powerful new degree of freedom to semiconductor gas sensors being more intellegient and integratable.

Topic 11. Physical and Chemical Sensors

Primary author

Huan Liu

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