高压电性薄木的构筑及其响应机制OA

With the advancement of smart home technology and the Internet of Things(IoT),the application of wood piezoelectric effect to endow wooden household products with intelligent response capability has garnered significant attention.Notably,the advantages of wood,such as renewability,biodegradability,easy of processing,and environmental friendliness,make it be as a promising material for sustainable self-powered electronic devices.However,natural wood cannot be directly utilized to be the substrate of self-powered electronic device,which is mainly due to its rigidity.In this study,a high-piezoelectricity wood veneer with good mechanical properties was developed by the deep eutectic solvent(DES)treatment of natural balsa wood.Firstly,balsa wood veneers were softened through the DES consisting of choline chloride and lactic acid.The results showed that the lignin of the wood was partly removed while its porous structure was maintained well,which endowed the softened wood veneers with excellent compression resilience.For instance,it could be compressed for 100 cycles at a fixed stress of 49.00 kPa,accompanying with a strain retention rate as high as 75%.The softened wood veneer sample with splendid mechanical properties provided a good substrate for the preparation of the self-powered electronic device.Subsequently,the softened veneers were further heat-treated using the ZnCl2-urea-based DES system.The results revealed that a large amount of zinc oxide(ZnO)nanoparticles was attached to the cell wall surface of the modified wood veneers.The ZnO nanoparticles possessed excellent piezoelectric property,which was expected to significantly improve the piezoelectric property of thin wood veneer.More importantly,the modified wood veneers maintained outstanding mechanical properties while exhibiting good piezoelectric properties(the output voltage of a single thin-wood veneer sample with a thickness of 1 mm,a length of 20 mm,and a width of 20 mm could reach 0.24 V;besides,the output voltage of the modified thin-wood group consisting of four thin-wood veneers in series was up to 0.92 V,and the voltage output was stable).Impressively,the successful construction of the high-piezoelectricity wood veneer was mainly attributed to the charge generation substrate provided by the multi-level porous structure of the wood and the charge transport channels formed by the hierarchical structure of the wood.Simultaneously,the excellent piezoelectricity of ZnO nanoparticles endowed the wood substrate with a high output voltage.Thus,the obtained high-piezoelectricity wood veneers not only offered scientific guidance for the preparation of self-powered wood-based electronic devices that are suitable for smart home but also provided a theoretical basis for the high-value utilization of wood.