Zhai Lindong, Kim Hyun-Chan, Muthoka Ruth M, Latif Muhammad, Alrobei Hussein, Malik Rizwan A, Kim Jaehwan
CRC for Nanocellulose Future Composites, Inha University, Incheon 22212, Korea.
Department of Mechanical Engineering, Prince Sattam bin Abdul Aziz University, AlKharj 11942, Saudi Arabia.
Nanomaterials (Basel). 2021 May 27;11(6):1419. doi: 10.3390/nano11061419.
This paper reports a genuine environment-friendly hybrid nanocomposite made by growing zinc oxide (ZnO) nanorods on cellulose nanofiber (CNF) film. The nanocomposite preparation, characterizations, electromechanical property, and ultraviolet (UV) sensing performance are explained. CNF was extracted from the pulp by combining the 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidation and the aqueous counter collision (ACC) methods. The CNF film was fabricated using doctor blade casting, and ZnO nanorods were grown on the CNF film by seeding and by a hydrothermal method. Morphologies, optical transparency, mechanical and electromechanical properties, and UV sensing properties were examined. The nanocomposite's optical transparency was more than 80%, and the piezoelectric charge constant d was 200 times larger than the CNF film. The UV sensing performance of the prepared ZnO-CNF nanocomposites was tested in terms of ZnO concentration, UV irradiance intensity, exposure side, and electrode materials. A large aspect ratio of ZnO nanorods and a work function gap between ZnO nanorods and the electrode material are essential for improving the UV sensing performance. However, these conditions should be compromised with transparency. The use of CNF for ZnO-cellulose hybrid nanocomposite is beneficial not only for electromechanical and UV sensing properties but also for high mechanical properties, renewability, biocompatibility, flexibility, non-toxicity, and transparency.
本文报道了一种通过在纤维素纳米纤维（CNF）薄膜上生长氧化锌（ZnO）纳米棒制备的真正环境友好型混合纳米复合材料。文中解释了该纳米复合材料的制备、表征、机电性能和紫外（UV）传感性能。通过结合2,2,6,6-四甲基哌啶-1-氧基自由基（TEMPO）氧化法和水相反碰撞（ACC）法从纸浆中提取CNF。采用刮刀法制备CNF薄膜，并通过种子法和水热法在CNF薄膜上生长ZnO纳米棒。研究了其形貌、光学透明度、机械和机电性能以及UV传感性能。该纳米复合材料的光学透明度超过80%，压电电荷常数d比CNF薄膜大200倍。从ZnO浓度、UV辐照强度、暴露面和电极材料等方面测试了所制备的ZnO-CNF纳米复合材料的UV传感性能。ZnO纳米棒的高纵横比以及ZnO纳米棒与电极材料之间的功函数差对于提高UV传感性能至关重要。然而，这些条件应与透明度相权衡。将CNF用于ZnO-纤维素混合纳米复合材料不仅有利于机电和UV传感性能，而且有利于获得高机械性能、可再生性、生物相容性、柔韧性、无毒和透明性。
