Abstract
Structures and performances from nature provide ideas for humans to deal with energy and environmental crisis. Inspired from natural structures, bacterial cellulose nanofibers with a fine-meshed network were selected as the raw materials to design acetone gas sensors. Here, Fe2O3 nanorods were successfully introduced on the surface of carbon nanofibers by a feasible hydrothermal catalytic carbonization at 120 °C. Lots of heterojunctions between the bacterial cellulose carbon nanofiber and the Fe2O3 nanorod were constructed, resulting in high gas-sensing properties to acetone vapor. At room temperature, the response of Fe2O3/bacterial cellulose carbon nanofiber composite (BCCF–Fe2O3) to 5 ppm of acetone reached 2060% within 10 s. BCCF–Fe2O3 showed high sensitivity and selectivity, ppb-level detection limit (100.7 ppb), nice long-term stability (30 days), low energy consumption (1.4 μW), and good anti-humidity performance in acetone detection. To our surprise, BCCF–Fe2O3 had realized ultrasensitive exhaled acetone detection within 16 s, proving an effective and inexpensive strategy for diabetic noninvasive diagnosis.
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