Wearable inorganic semiconductors (ISCs) based thermoelectric (TE) devices, especially fiber-based thermoelectric textiles (TETs), show promises in electrical power generation and solid-state cooling compared with bulk ISCs-based TE generators (TEGs). However,...

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There is a great demand to develop high-performance hydrogen sulfide (H 2 S) sensors, especially at the trace level for environmental protection, human healthcare, and food freshness monitoring. To this end, cellulose nanofiber (CNF)templated CuO (CuO-C) was decorated with tungsten disulfide (WS 2 ) nanosheets (W-Cu-C) as the sensing layer of chemiresistive microelectromechanical system (MEMS) sensors for H 2 S recognition in this work. As compared to pristine CuO counterparts at 160.5 °C, the as-prepared W-Cu-C-10 sensors delivered a 30-fold enhanced response of 37 toward 0.5 ppm H 2 S at a lower optimal operation temperature of 100.1 °C. Moreover, a fast response/ recovery speed of 37.2/33.9 s toward 0.5 ppm H 2 S and excellent long-term stability and selectivity were achieved. Compared with existing research and commercial products, the W-CU-C-10 sensors exhibited the remarkable superiorities of high sensitivity, the lowest detection limit of 200 ppb, and ultralow power consumption (8 mW). Also, the sensor showcased a nice on-site application potential for evaluating eggs' freshness. The proposed W-Cu-C-10 sensors probably pave a new avenue for designing high-sensitivity and energy-efficient future H 2 S sensors, especially in the fields of portable and wearable detection systems as well as Internet of Things.