金红石TiO2基质中[MoO4]2-基团的上转换发光

在978nm激光二极管的激发下,Mo掺杂的TiO₂材料表现出很强的宽带上转换发光,该发光来源于[MoO₄]^2-基团的激发态³T₁,³T₂能级到基态¹A₁能级的电子跃迁,X射线衍射表明样品为金红石单一相,红外吸收光谱证实了[MoO₄]^2-的存在,由光电子能谱推测体系中还含有低价态的Mo离子,它们提供了上转换得以进行的中间态,高温下的氧化还原处理会改变低价Mo的数量,从而严重影响样品的发光行为。     

Site Selective Spectroscopy of Surfactant-Assembled Y_2O_3∶Eu Nanotubes

Nanometermaterialshaveattractedagreatdealofattentioninthelastdecadebecauseoftheirgreatpo tentialfornanotechnologicalapplicationsandforun derstandingsomefundamentalconceptsabouttherolesofdimensionalityandsizein ,forexample ,optical ,electrical ,andmechanicalproperties[1,2 ] .Differentshapes ,suchasparticles ,films ,wires ,andtubes ,havebeenfabricatedwithvarioustechniques[3～ 6 ] .Inparticular ,thenanotubesusuallypresentnovelproper tiesassociatingwiththeirsmalldimensions ,highanisotropy ,andintr…     

血糖监测系统的研究进展

糖尿病是一种以高血糖为特征的代谢障碍性疾病,是21世纪人类最需要重点解决的健康问题之一。因为降糖类药物的使用剂量需要根据血糖水平随时进行调整,所以血糖监测成为了糖尿病护理最重要的组成部分。经过半个多世纪的研究,大量的葡萄糖传感器被开发出来,不同的检测方法相继得到发展。通过梳理整个血糖监测系统的发展过程,阐述各类葡萄糖传感器的技术方案和特点,针对研究现状及存在问题进行总结讨论,并对未来的机遇与将要面对的挑战进行了展望。     

文10-83井超短半径径向水平井钻井实验

超短半径径向水平井钻井采用连续油管在套管内实现开窗,利用高压水射流进行径向钻进,可在老井油层位置不同井深、方位进行快速钻进,有效改善渗透条件,扩大泄油面积,提高原油采收率。     

中科院院士江雷荣获“求是杰出科学家奖”

正9月15日晚,由香港求是科技基金会主办、中国科学技术大学承办的2018年度"求是奖"颁奖典礼在中国科大举行,中科院院士、中科院理化技术研究所研究员江雷获得"求是杰出科学家奖"。求是基金会主席查懋声,顾问杨振宁、孙家栋、韩启德、施一公等出席颁奖典礼。中科院理化技术研究所江雷教授师法自然,建立了超浸润界面材料及超浸润界面化学体系,引领并推动了该领域在全球的发展,     

Site Selective Spectroscopy of Suffactant－Assembled Y2O3：Eu Nanotubes

Y2O3:Eu nanotubes were synthesized by a surfactant assembly mechanism. Under ultraviolet-light excitation,the nanotubes present luminescence properties different from that of Y2O3:Eu nanoparticles. The peak position of the charge transfer band in excitation spectra varies with the monitoring emission peaks, while the emission spectra are dependent on the excitation wavelength. Laser selective spectroscopy was performed to distinguish the local symmetries of the Eu^3 ions in the nanotubes. The results of laser-selective excitation indicate that the emission centers near the surface of nanotube wails exhibit inhomogeneously broadened spectra without spectral structures while the two sites (site B and site C) inside the nanotube walls present resolved spectral structures. It is concluded by the number and peak positions of the spectral lines that the sites B and C possess different site symmetries.     

金红石TiO2基质中[MoO4]2-基团的上转换发光

在978nm激光二极管的激发下，Mo掺杂的TiO2材料表现出很强的宽带上转换发光，该发光来源于[MoO4]^2-基团的激发态3T1，3T2能级到基态1Al能级的电子跃迁．X射线衍射表明样品为金红石单一相，红外吸收光谱证实了[MoO4]2-的存在．由光电子能谱推测体系中还含有低价态的Mo离子，它们提供了上转换得以进行的中间态．高温下的氧化还原处理会改变低价Mo的数量，从而严重影响样品的发光行为。     

Fabrication and Luminescence of Rare Earth Complex／SiO2 Hybrid Nanospheres

The organic rare earth complex was embedded in silica spheres to form inorganic-organic hybrid. Photoactiver are earth complexes with various organic ligands exhibit intense narrow emission band, and the silica is an excellent matrix for inorganic-organic structure. The transmission electron microscope image presents the hybrid nanospheres. The diameter of the hybrid is about 100 nm. The europium complex that incorporated into silica sphere is also proved by the IR spectra, the excitation and emission spectra. The lifetimes of the Eu3 ions in the hybrid nanospheres and in the pure europium complex were also detected. This hybrid with inhomogeneous compositions exhibits specifically tailored chemical and optical properties, such as perfect thermal and mechanical stability, colorimetric purity and so on. It can be used as luminescent and optical material in EL and PL fields.