Lei Zhang, Yongqiang Yang, Yongping Pu, Min Chen, Ning Xu, Xia Wu
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引用次数: 0
摘要
低表面电势(1V)限制了铁电抗菌陶瓷的大规模商业应用。我们提出了一种基于电荷平衡掺杂的策略,以增强 NaNbO3(NN)基陶瓷的极化和电位,从而实现消毒应用。经 Mg2+ 修饰的 NN 在不加热或超声处理的情况下,1.5 小时内的杀菌效果大于 80%,3 小时内的杀菌效果大于 99.8%,优于其他已发表的研究成果。这主要是因为与 NN 和 Ca2+ 修饰的 NN 相比,其表面电动势为 1.72 V,缺陷相关放电电流为 141.9 pA。铁电特性表明,NN-Mg 具有较低的 EC(40 kV/cm)和较高的 Pr(32 μC/cm2)。此外,XRD、拉曼偏移、PFM 和介电常数测试的综合结果表明,NN-Mg 中更小的畴和更强的铁电特性源于两性掺杂。最后,电场分布的模拟结果表明,NN-Mg 对表面带负电荷的细菌具有更强的吸引力或排斥力。
Novel NaNbO3-based, ferroelectric ceramics with excellent polarization and electric potential for antibacterial applications
Low surface electric potential (<1V) limits the large-scale commercial application of ferroelectric antibacterial ceramics. We propose a strategy based on charge-balancing doping to enhance polarization and potential in NaNbO3(NN)-based ceramics for disinfection application. The Mg2+ modified NN showed a superior bactericidal effect greater than 80% for 1.5 h and 99.8% for 3 h without heating or ultrasonication, which is superior to other published works. This is mainly due to its excellent surface electric potential of 1.72 V and defect-related discharge current of 141.9 pA compared to NN and Ca2+ modified NN. Ferroelectric properties demonstrated that NN-Mg possesses a lower EC of ∼40 kV/cm and a higher Pr of ∼32 μC/cm2. Furthermore, the combination of XRD, Raman shift, PFM, and permittivity testing suggests that the smaller domain and enhanced ferroelectric properties in NN-Mg originated from amphoteric doping. Finally, simulation results of the electric field distribution indicated that NN-Mg had a stronger attraction or repulsion to bacteria with negatively charged surfaces.
期刊介绍:
Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.