牺牲模板法制备铌酸钾纳米棒单晶及其二次谐波产生

Synthesis of single-crystalline KNbO3 nanowires with a sacrificial template method and their second harmonic generation respo

摘要:

本文首次使用五氧化二铌纳米棒作为原料通过水热反应合成出60-150nm宽、几个μm长的高产率、斜方晶系铌酸钾纳米棒晶体。使用X-射线衍射仪（XRD)、扫描电镜(SEM)、透射电镜(TEM)、高分辨透射电镜(HRTEM)、选区电子衍射技术(SAED)对铌酸钾纳米棒晶体的形貌和结构进行了表征。合成的铌酸钾纳米棒表现出二次谐波产生响应，并发射出高效率的纳米二次谐波光线。铌酸钾纳米棒晶体沿着[001]方向生长。合成的铌酸钾纳米棒以其优异的非线性光学性能在纳米光学器件中的应用具有很好的发展前景。

Abstract:

High yield orthorhombic single-crystalline KNbO3 nanowires with widths of 60-150 nm and lengths up to a few microns were synthesized with a template-directed process in a hydrothermal reaction. For the first time, Nb2O5 nanobelts were used as reactants as well as templates in the hydrothermal process. The phase of products was determined by XRD, and the morphology and structure were characterized by SEM, TEM, HRTEM, SAED techniques. The growth direction of KNbO3 was determined to be the [001] crystallographic direction. Synthesized nanowires exhibited a second harmonic generation response, an efficient nanoscale second harmonic light source. The excellent nonlinear optical properties of KNbO3 have potential applications in nano-optical devices.