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                              Gas sensors

Volatile organic compound (VOC) detection is critical for controlling industiral and commercial emissions, environmental monitoring, and public health. Simple, portable, rapid and low-cost VOC sensing platforms can bring benefits of on-site and real-time monitoring anytime and anywhere.  Particularly, equipment-free and power-free detection by the naked eye would be among the best and most practically useful approaches. In this work, we create a novel paper-based cantilever sensor array for simple and rapid naked-eye VOC detection without any power, electronics or read-out interface/equipment.