检索结果-南通市图书馆

InP/SiO_2纳米复合膜的微观结构和光学性质

在线全文

学校读者我要写书评

暂无评论

物理学报 2001年第8期50卷 1574-1579页

作者：丁瑞钦王浩 w.F.LAU w.y.cheung S.P.wONG 王宁娟于英敏广东省五邑大学薄膜与纳米材料研究所江门529020 香港中文大学电子工程系暨材料科技研究中心南开大学光电子薄膜器件与技术研究所天津300071

应用射频磁控共溅射方法在石英玻璃和抛光硅片上制备了InP SiO2 复合薄膜 ,并在几种条件下对这些薄膜进行退火 .X射线光电子能谱和卢瑟福背散射实验结果表明 ,复合薄膜中InP和SiO2 的化学组分都大体上符合化学计量配比 .X射线衍射和激... 详细信息

应用射频磁控共溅射方法在石英玻璃和抛光硅片上制备了InP SiO2 复合薄膜 ,并在几种条件下对这些薄膜进行退火 .X射线光电子能谱和卢瑟福背散射实验结果表明 ,复合薄膜中InP和SiO2 的化学组分都大体上符合化学计量配比 .X射线衍射和激光喇曼谱实验结果都证实了复合薄膜中形成了InP纳米晶粒 .磷气氛保护下的高温(5 2 0℃ )退火可以消除复合薄膜中残存的In和In2 O3 并得到了纯InP SiO2 纳米复合薄膜 .

关键词：纳米晶粒微观结构光学性质纳米复合膜磷化铟

Ag对CoPt/Ag纳米复合膜的结构与磁性的影响

在线全文

学校读者我要写书评

暂无评论

物理学报 2005年第11期54卷 5395-5399页

作者：薛双喜王浩杨辅军王君安曹歆汪汉斌高云黄忠兵冯洁 w.y.cheung S.P.wong 赵子强湖北大学物理学与电子技术学院暨纳米技术研究中心武汉430062 香港中文大学电子工程系北京大学重离子物理教育部重点实验室北京100871

采用直流磁控溅射的方法制备了一系列(CoPt/Ag)n多层膜,然后在不同温度下进行了退火处理,并对其结构和磁性做了初步的表征,研究了Ag的含量以及薄膜中每一单元厚度与总厚度对退火后薄膜的结构以及磁性能的影响.结果表明,膜厚较薄时(大约2... 详细信息

采用直流磁控溅射的方法制备了一系列(CoPt/Ag)n多层膜,然后在不同温度下进行了退火处理,并对其结构和磁性做了初步的表征,研究了Ag的含量以及薄膜中每一单元厚度与总厚度对退火后薄膜的结构以及磁性能的影响.结果表明,膜厚较薄时(大约20nm)有利于薄膜沿(001)取向生长,Ag的加入不但能够抑制CoPt晶粒的过分长大还可以诱导薄膜的(001)取向,使退火后的薄膜在垂直于膜面方向上的矫顽力大大增强.对于特定组分为Co40Pt43Ag17的薄膜,经600℃退火后已经显示了明显的(001)取向,垂直于膜面方向上的矫顽力为5.6×105A/m,饱和磁化强度为0.65T,并且磁滞回线具有很好的矩形度,剩磁比(s)为0.95.

关键词：磁记录材料,磁性薄膜,CoPt/Ag纳米复合膜磁性能纳米复合膜结构 Ag 退火处理直流磁控溅射取向生长饱和磁化强度磁滞回线

Microstructure and Nonlinear Optical Properties of Very Small Size GaAs Nanogranulae Embedded in SiO_2 Matrix by Magnetron Co-Sputtering

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2002年第3期23卷 238-245页

作者：丁瑞钦王浩佘卫龙丘志仁罗莉五邑大学薄膜与纳米材料研究所江门529020 中山大学超快速激光光谱国家重点实验室广州510275

Microstructure of GaAs/SiO 2 nanogranular thin films fabricated by radio frequency magnetron co sputtering technique and postannealing are investigated via atomic force microscope,X ray diffraction,and Rutherford backscattering *** results show that GaAs nanocrystals with average diameters from 1 5nm to 3 2nm (depending on the annealing temperature) are uniformly dispersed in the SiO 2 *** and SiO 2 are found in normal stoichiometry in the *** nonlinear optical refraction and nonlinear optical absorption are studied by Z scan technique using a single Gaussian beam of pulse *** third order nonlinear optical refractive index and nonlinear absorption coefficient are enhanced due to the quantum confinement effects and estimated to be 4×10 -12 m 2/w and 2×10 -5 m/w respectively in nonresonant condition,while 2×10 -11 m 2/w and -1×10 -4 m/w respectively in quasi resonant condition.

关键词： magnetron co sputtering GaAs nanogranula microstructure optical nonlinearity

Co/C/Si(100)结构固相外延生长CoSi_2

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2003年第1期24卷 63-67页

作者：屈新萍徐蓓蕾茹国平李炳宗 w.y.cheung S.P.wong Paul K.Chu 复旦大学微电子学系ASIC及系统国家重点实验室上海200433 香港中文大学电子工程系香港城市大学物理和材料科学系

采用 Co/C/Si多层薄膜结构的中间层诱导固相外延方法在 Si(10 0 )上制备外延 Co Si2 薄膜 .用四探针电阻仪、XRD、AES、RBS等分析手段对该结构固相反应形成的薄膜的电学特性、组分、晶体结构等进行了表征 .结果表明 ,Co/C/Si多层结构经... 详细信息

采用 Co/C/Si多层薄膜结构的中间层诱导固相外延方法在 Si(10 0 )上制备外延 Co Si2 薄膜 .用四探针电阻仪、XRD、AES、RBS等分析手段对该结构固相反应形成的薄膜的电学特性、组分、晶体结构等进行了表征 .结果表明 ,Co/C/Si多层结构经快速热退火 ,可以在 Si(10 0 )衬底上得到导电性能和高温稳定性良好的 Co Si2 薄膜 .C层的加入阻碍了 Co和 Si的互扩散和互反应 ,从而促进了 Co Si2 在硅衬底上的外延 .

关键词：固相反应固相外延金属硅化物二硅化钴中间层诱导

Co/a-GeSi/Ti/Si多层薄膜固相反应外延生长CoSi_2薄膜

在线全文

学校读者我要写书评

暂无评论

固体电子学研究与进展 2003年第2期23卷 149-154页

作者：徐蓓蕾屈新萍韩永召茹国平李炳宗 w.y.cheung S.P.wong Paul K.Chu 复旦大学微电子学系 ASIC及系统国家重点实验室上海200433 香港中文大学电子工程系香港城市大学物理和材料科学系

研究了在 Co/Ti/Si结构中加入非晶 Ge Si层对 Co Si2 /Si异质固相外延的影响 ,用离子束溅射方法在Si衬底上制备 Co/Ge Si/Ti/Si结构多层薄膜 ,通过快速热退火使多层薄膜发生固相反应。采用四探针电阻仪、AES、XRD、RBS等方法进行测试。... 详细信息

研究了在 Co/Ti/Si结构中加入非晶 Ge Si层对 Co Si2 /Si异质固相外延的影响 ,用离子束溅射方法在Si衬底上制备 Co/Ge Si/Ti/Si结构多层薄膜 ,通过快速热退火使多层薄膜发生固相反应。采用四探针电阻仪、AES、XRD、RBS等方法进行测试。实验表明 ,利用 Co/Ge Si/Ti/Si固相反应形成的 Co Si2 薄膜具有良好的外延特性和电学特性 ,Ti中间层和非晶 Ge Si中间层具有促进和改善 Co Si2 外延质量 ,减少衬底耗硅量的作用。Ge原子的存在能够改善外延 Co Si2

关键词：金属硅化物固相外延扩散阻挡层晶格失配 Co/Ti/Si结构钴钛硅化合物

ELECTRON FIELD EMISSION FROM SiC/Si HETEROSTRUCUTRES SyNTHESIZED By CARBON IMPLANTATION USING A MEwA ION SOURCE

在线全文

学校读者我要写书评

暂无评论

ELECTRON FIELD EMISSION FROM SiC/Si HETEROSTRUCUTRES SYNTHES...

Repeatability,interocular correlation and agreement of optic nerve head vessel density in healthy eyes:a sweptsource optical coherence tomographic angiography study

1998 5th International Conference on Solid-State and Integrated Circuit Technology

作者： Dihu Chen S.P.wong w.y.cheung E.Z.Luo w.wu J.B.Xu I.H.wilson R.w.M.Kwok Department of Electronic Engineering and Materials Science & Technology Research Centre The Chinese University of Hong Kong ShatinHong Kong China Department of Chemistry and Materials Science & Technology Research Centre The Chinese University of Hong Kong ShatinHong Kong China

Planar SiC/Si heterostructures were formed by high dose carbon implantation using a metal vapor vacuum arc ion *** variations of the field emission properties with the implant dose and annealing conditions were studied.A remarkably low turn-on field of IVμm was observed from a sample implanted at 35 keV to a dose of 1.0×10 cm with subsequent annealing in nitrogen at 1200℃for *** chemical composition depth profiles were determined from x-ray photoelectron spectroscopy and the surface morphology was observed by atomic force *** formation of a thin surface stoichiometric SiC layer and the formation of densely distributed small protrusions on the surface are believed to be the two factors responsible for the efficient electron field emission.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第5期17卷 896-903页

作者： Dan-Qi Fang Da-wei yang Xiao-Ting Mai Carol y cheung Hao-yu Chen Joint Shantou International Eye Center Shantou University&the Chinese University of Hong KongShantou 515041Guangdong ProvinceChina Department of Ophthalmology and Visual Sciences Chinese University of Hong KongHong Kong 999077China

AIM:To assess the repeatability,interocular correlation,and agreement of quantitative swept-source optical coherence tomography angiography(OCTA)optic nerve head(ONH)parameters in healthy ***:Thir ty-three healthy subjects were *** ONH of both eyes were imaged four times by a swept-source-OCTA using a 3 mm×3 mm scanning *** of the radial peripapillary capillary were analyzed by a customized Matlab program,and the vessel density,fractal dimension,and vessel diameter index were *** repeatability of the four scans was determined by the intraclass correlation coefficient(ICC).The most well-centered optic disc from the four repeated scans was then selected for the interocular correlation and agreement analysis using the Pearson correlation coefficient,ICC and Bland-Altman ***:All swept-source-OCTA ONH parameters exhibited certain repeatability,with ICC>0.760 and coefficient of variation(CoV)≤7.301%.The obvious interocular correlation was observed for papillary vessel density(ICC=0.857),vessel diameter index(ICC=0.857)and fractal dimension(ICC=0.906),while circumpapillary vessel density exhibited moderate interocular correlation(ICC=0.687).Bland-Altman plots revealed an agreement range of-5.26%to 6.21%for circumpapillary vessel ***:OCTA ONH parameters demonstrate good repeatability in healthy *** interocular correlations of papillary vessel density,fractal dimension and vessel diameter index are high,but the correlation for circumpapillary vessel density is moderate.

关键词： interocular correlation repeatability optic nerve head optical coherence tomography angiography vessel density

Effect of Eu3+,Bi3+,and Li+ doping on luminescent property of GdNbO4

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第1期42卷 66-75页

作者： S.w.wi y.S.Lee Department of Physics and Integrative Institute of Basic Sciences Soongsil University

we investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4were prepared using a high-temperature solid-state reaction *** red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission *** improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio estimated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4phosphors.

关键词： Eu 3+ GdNbO 4 Codoping of Li + Photoluminescence Sensitizer Rare earths

lnP/SiO2纳米颗粒膜的制备与微观结构的研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

lnP/SiO2纳米颗粒膜的制备与微观结构的研究