State Key Laboratory of Silkworm Genome Biology, and Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
Key Laboratory of Processing and Quality Evaluation Technology of Green Plastics of China National Light Industry council, Beijing Technology and Business University, Beijing 100048, China.
Carbohydr Polym. 2022 Dec 15;298:120099. doi: 10.1016/j.carbpol.2022.120099. Epub 2022 Sep 13.
Self-powered piezoelectric sensors based on cellulose nanocrystal (CNC) porous materials are light-weight and portable, whereas using unmodified CNCs can hardly obtain enough piezoelectric properties without external strong polarization due to its irreversible deformation caused by low toughness. Here, we bonded rod-like CNCs with a soft polymer, poly ethylene glycol (PEG), and hypothesized that PEG could toughen the material and its dielectric signal could induce the CNC polarization. We further adsorbed graphene (GR) as surface electrodes to prepare a CNC-PEG-GR piezoelectric porous material with density of 0.096 g·cm. The voltage output reached maximum when the frequency matched the dielectric relaxation frequency of PEG. We also increased the length-diameter ratio of porous material pores from 1.1 to 3.3 by adjusting its freeze-drying process, and the voltage output could reach to 0.7 V at a moderate ratio. They could be conveniently integrated into portable self-powered sensors applied to the intelligent wearable electronic devices.
基于纤维素纳米晶体 (CNC) 多孔材料的自供电压电传感器重量轻、体积小，而未经修饰的 CNC 由于韧性低而导致不可逆变形，因此很难在外加强极化的情况下获得足够的压电性能。在这里，我们将棒状的 CNC 与软聚合物聚乙二醇 (PEG) 结合在一起，并假设 PEG 可以增韧材料，其介电信号可以诱导 CNC 极化。我们进一步吸附石墨烯 (GR) 作为表面电极，制备出密度为 0.096 g·cm 的 CNC-PEG-GR 压电多孔材料。当频率与 PEG 的介电松弛频率匹配时，电压输出达到最大值。我们还通过调整其冷冻干燥过程，将多孔材料孔的长径比从 1.1 增加到 3.3，在适中的比例下，电压输出可达 0.7 V。它们可以方便地集成到便携式自供电传感器中，应用于智能可穿戴电子设备。
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