tailieunhanh - Báo cáo hóa học: " In situ Precursor-Template Route to Semi-Ordered NaNbO3 Nanobelt Arrays"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: In situ Precursor-Template Route to Semi-Ordered NaNbO3 Nanobelt Arrays | Wu and Xue Nanoscale Res Lett 2011 6 14 http content 6 1 14 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access In situ Precursor-Template Route to Semi-Ordered NaNbO3 Nanobelt Arrays Junshu Wu Dongfeng Xue Abstract We exploited a precursor-template route to chemically synthesize NaNbO3 nanobelt arrays. Na7 H3O Nb6O19d4H2O nanobelt precursor was firstly prepared via a hydrothermal synthetic route using Nb foil. The aspect ratio of the precursor is controllable facilely depending on the concentration of NaOH aqueous solution. The precursor was calcined in air to yield single-crystalline monoclinic NaNbO3 nanobelt arrays. The proposed scheme for NaNbO3 nanobelt formation starting from Nb metal may be extended to the chemical fabrication of more niobate arrays. Introduction One-dimensional 1D nanostructures are receiving an ever-increasing amount of attention from researchers in various disciplines because of their unusual quantum properties to their bulk counterparts and potential use as building blocks for the next generation of nanoscale optical electronic photonic and biological devices 1 2 . Ordered functional arrays or chemically defined surfaces with fascinating quantum behaviour are more attractive nanostructures owing to their applications in high-density memories sensors lasers and photonic crystals. Although numerous efforts have been invested in developing simple and low-cost fabrication techniques for the growth of high-quality 1D materials in a relatively large scale 3-10 the ability to fabricate ordered 1D micro-and nanostructures in a desired pattern with controllable size and shape uniformity is a key challenge in enabling their improved technological applications and has opened up the minds of new generation of materials scientists about the potential of nanoscience and technology 11 12 . Alkaline niobates is one class of widely investigated ternary materials because of their optical ferroelectric and