二氧化锰纳米棒掺杂纤维素复合膜用于压电纳米发电机

Manganese Dioxide Nanorods-Doped Cellulose Composite Film for Piezoelectric Nanogenerators

纤维素是地球上最丰富的天然高分子资源。具有可再生、成本低和生物相容性好等优点,同时纤维素的高结晶性和丰富的极性羟基使其具有大量偶极子和较强的给电子能力,具有良好的压电效应,可作为绿色电子产品的原料。本文采用水热法制备了纯度高、粒径小和分散性好的二氧化锰纳米棒(MnO_(2)),并将其掺杂到Ⅰ型纤维素中制成MnO_(2)/纤维素复合膜,考察不同质量分数的MnO_(2)对复合膜压电纳米发电机电流输出性能的影响。随着MnO_(2)的增加,输出电流呈现先增大后减小的趋势。MnO_(2)掺杂质量分数为30%时,复合膜最大热失重速率温度为325℃,比纯纤维素提高了44℃。复合膜与纯纤维素和MnO_(2)的O1s结合能值均不同,证明纤维素与MnO_(2)之间存在化学键合作用。使用MnO_(2)/纤维素复合膜制成了可达微安级电流的压电纳米发电机,其最大输出电流为80.75μA,输出电压为1.10 V。在手指的按压下,此压电纳米发电机能够驱动LED灯、计算器和电子手表等多种电子产品。此新型绿色环保压电纳米发电机的研究是以纤维素为基质,同时MnO_(2)的掺杂还提高了能量收集效率,为推动纳米发电机技术的发展提供了新思路。

Cellulose is the most abundant natural polymer resource on the earth.It has the advantages of renewable,low cost,and good biocompatibility.At the same time,cellulose has many dipoles and strong electron donating ability due to its high crystallinity and rich polar hydroxyl group.It has the good piezoelectric effect and can be used as raw material of green electronic products.In this paper,manganese dioxide nanorods(MnO_(2))with high purity,small particle size and good dispersion were prepared by a hydrothermal method,which doped into type I cellulose to prepare a MnO_(2)/cellulose composite film.The effects of different contents of MnO_(2) on the current output performance of the MnO_(2)/cellulose composite film piezoelectric nanogenerator were investigated.With the increase of manganese dioxide content,the output current shows a trend of first increasing and then decreasing.When the doping quality of MnO_(2) is 30%,the maximum thermal weight loss rate of the composite film is 325℃,which is 44℃higher than that of pure cellulose.The O1s binding energy values of the composite film were different from pure cellulose and manganese dioxide,which proves the existence of chemical bonding between cellulose and manganese dioxide.The piezoelectric nanogenerator with microampere-level current was fabricated by using the MnO_(2)/cellulose composite film.The maximum output current is 80.75μA,and the output voltage is 1.10 V.With the press of finger,the piezoelectric nanogenerator can drive a variety of electronic products such as lightemitting diode(LED)lights,calculators and electronic watches.This new type of green piezoelectric nanogenerator is based on cellulose,and MnO_(2) doping also improves the energy collection efficiency,which provides a new idea for promoting the development of nanogenerator technology.