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Báo cáo hóa học: " Synthesis and characterization of aligned ZnO/ BeO core/shell nanocable arrays on glass substrate"

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: Synthesis and characterization of aligned ZnO/ BeO core/shell nanocable arrays on glass substrate | Zhou et al. Nanoscale Research Letters 2011 6 506 http www.nanoscalereslett.eom content 6 1 506 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Synthesis and characterization of aligned ZnO BeO core shell nanocable arrays on glass substrate Minjie Zhou Zao Yi Kai Li Jicheng Zhang and Weidong Wu Abstract By sequential hydrothermal growth of ZnO nanowire arrays and thermal evaporation of Be large-scale vertically aligned ZnO BeO core shell nanocable arrays on glass substrate have been successfully synthesized without further heat treatment. Detailed characterizations on the sample morphologies compositions and microstructures were systematically carried out which results disclose the growth behaviors of the ZnO BeO nanocable. Furthermore incorporation of BeO shell onto ZnO core resulted in distinct improvement of optical properties of ZnO nanowire i.e. significant enhancement of near band edge NBE emission as well as effective suppression of defects emission in ZnO. In particular the NBE emission of nanocable sample shows a noticeable blue-shift compared with that of pristine ZnO nanowire which characteristics most likely originate from Be alloying into ZnO. Consequently the integration of ZnO and BeO into nanoscale heterostructure could bring up new opportunities in developing ZnO-based device for application in deep ultraviolet region. PACS 61.46.K 78.67.Uh 81.07.Gf. Keywords heterostructure type I band alignment microstructure optical properties Backgrounds Semiconductor nanowires take advantages of both the morphology of one-dimensional nanostructure and the unique physical properties of semiconductor having great potential to serve as functional building blocks for various nanodevice applications including gas sensing solar energy conversion and light emitting diodes 1-9 . Since the large surface to volume ratio of nanowire surface plays important role to determine its properties 10 . Nevertheless as-prepared nanowires are generally