Triethylamine (TEA) gas sensors having excellent response and selectivity are in great demand to monitor the real environment. In this work, we have successfully prepared a hollow SnO microfiber by a unique sustainable biomass conversion strategy and shown that the microfiber can be used in a high-performance gas sensor. The sensor based on the hollow SnO microfiber shows a quick response/recovery toward triethylamine. The response of the hollow SnO microfiber is up to 49.5 when the concentration of TEA gas is 100 ppm. The limit of detection is as low as 2 ppm. Furthermore, the sensor has a relatively low optimal operation temperature of 270 °C, which is lower than those of many other reported sensors. The excellent sensing properties are largely attributed to the high sensitivity provided by SnO and the good permeability and conductivity of the one-dimensional hollow structure. Thus, the hollow SnO microfiber using sustainable biomass as a template is a significant strategy for a unique TEA gas sensor.
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