检索结果-南通市图书馆

MoTe_(2)/Ta_(2)NiSe_(5)/MoTe_(2)范德华双异质结实现超快、宽带和偏振敏感光电探测器

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第7期67卷 2182-2192页

作者：张洁莲黎思娜朱玲玉郑涛李翎邓群睿潘志东江美华杨亚妮林月蓉李京波霍能杰 school of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China College of Physics and Optoelectronic Engineering Zhejiang UniversityHangzhou 310000China Guangdong Provincial Key Laboratory of Chip and Integration Technology Guangzhou 510631China

高效光电探测器在监控、热成像、光通信和环境监测等领域具有广泛、迫切的应用需求.优化光电探测器参数如微型化、高量子效率、超快响应速度等,仍然是一项艰巨的任务.我们提出了一种由顶部/底部MoTe_(2)和中间Ta_(2)NiSe_(5)层组成的双... 详细信息

高效光电探测器在监控、热成像、光通信和环境监测等领域具有广泛、迫切的应用需求.优化光电探测器参数如微型化、高量子效率、超快响应速度等,仍然是一项艰巨的任务.我们提出了一种由顶部/底部MoTe_(2)和中间Ta_(2)NiSe_(5)层组成的双范德华异质结.利用双异质结界面增强光收集效率和产生两个对立的内置电场,使得器件具有400到1550 nm的宽光谱响应,并表现出优异的性能,包括82.9%的外量子效率和3.5/4.2μs的快速响应速度.此外,利用二维Ta_(2)NiSe_(5)纳米片的面内各向异性,我们实现了在635和1550 nm波长下的极化灵敏度,分别为16.3和8.1.这项研究为开发高性能和多功能光电探测器提供了平台,为先进光电器件的设计和应用提供了新的方向.

关键词： polarimetric photodetector TazNiSes/MoTe_(2)het-erojunction photovoltaic polarization sensitivity

Incorporating catechol into electroactive polypyrrole nanowires on titanium to promote hydroxyapatite formation

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2018年第1期3卷 74-79页

作者： Zhengao Wang Jinquan Zeng Guoxin Tan Jingwen Liao Lei Zhou Junqi Chen Peng Yu Qiyou Wang Chengyun Ning school of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Guangdong Key Laboratory of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou 510006China guangzhou Tieyi middle school Guangzhou 510660China Institute of Chemical Engineering and light Industry Guangdong University of TechnologyGuangzhou 510006China guangzhou Institute of Advanced Technology Chinese Academy of SciencesGuangzhou 510006China Department of Spine Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China

To improve the osteointegration property of biomedical titanium,nano-architectured electroactive coating was synthesized through the electrochemical polymerization of dopamine and *** highly binding affinity of Ca2t to the catechol moiety of doped dopamine enabled efficient interaction between polypyrrole/polydopamine nanowires and mineral *** results indicate that the PPy/PDA nanowires preserved its efficient electro-activity and accelerated the hydroxyapatite deposition in a simulated body *** PPy/PDA nanowires coating could be applied to promote the osteointegration of titanium implant.

关键词： Titanium Hydroxyapatite Nanowires Catechol Polypyrrole

Large-scale functionalization of biomedical porous titanium scaffolds surface with TiO_2 nanostructures

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

Science China Materials 2018年第4期61卷 557-564页

作者： Lei Qian Peng Yu Jinquan Zeng Zhifeng Shi Qiyou Wang Guoxin Tan Chengyun Ning school of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Biomedical Engineering Key Laboratory of Guangdong Province Guangzhou 510641China guangzhou Tieyi middle school Guangzhou 510660China Department of Spine Surgery the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China school of Chemical Engineering and light Industry Guangdong University of TechnologyGuangzhou 510006China

Construction of functional porous titanium scaffold is drawing ever growing attention, due to its effectiveness in solving the mechanical mismatch between titanium implant and bone tissue. However, the poor water permeability as well as the problem in achieving uniform surface modification inside scaffold hinders the further biomedical application of porous titanium scaffold. In this study, largescale functional Ti O2 nanostructures（nanonetwork, nanoplate and nanowire） were constructed on three-dimensional porous titanium scaffolds surface via an effective hydrothermal treatment method. These nanostructures increase the hydrophilicity of the titanium scaffold surface, facilitating the cell culture medium to penetrate into the inner pore of the scaffold. Zeta potential analyses indicate that the surface electrical properties depend on the nanostructure, with nanowire exhibiting the lowest potential at p H 7.4. The influence of the nano-functionalized scaffold on protein adsorption and cell adhesion was examined. The results indicate that the nano-functionalized surface could modulate protein adsorption and bone marrow derived mesenchymal stem cells（BMSCs） adhesion, with the nanowire functionalized porous scaffold homogeneously promoting protein adsorption and BMSCs adhesion. Our research will facilitate future research on the development of novel functional porous scaffold.

关键词： porous titanium hydrothermal nanostructure scaffold cell adhesion

Highly sensitive infrared polarized photodetector enabled by out-ofplane PSN architecture composing of p-MoTe_(2),semimetal-MoTe_(2)and n-SnSe_(2)

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第6期15卷 5384-5391页

作者： Yiming Sun Jingxian Xiong Xuming Wu Wei Gao Nengjie Huo Jingbo Li Institute of Semiconductors South China Normal UniversityGuangzhou 510631China school of Physics Science and Technology Lingnan Normal UniversityZhanjiang 524048China

Leveraging the unique physical properties,two-dimensional(2D)materials have circumvented the disadvantages of conventional epitaxial semiconductors and held great promise for potential optoelectronic *** far,two main detector architectures including photodiode based on a van der Waals P-N junction or Schottky junction and phototransistor based on individual 2D materials or hybrids have been well ***,a trade-off between responsivity and speed always exists in those technologies thus hindering the overall performance ***,we propose a new device concept by sandwiching the 2D anisotropic semimetal between p-type and n-type semiconductors in the out-of-plane direction,called PSN architecture,realizing the improvement of each parameter including broad spectral coverage,fast speed,high sensitivity,power-free and *** stack the p-type 2H-MoTe_(2),Weyl semimetal 1T-MoTe_(2)and n-type SnSe_(2)layer-by-layer constructing vertical sandwich structure where the top and bottom layers contribute to the internal built-in electric field,the intermediate layer can facilitate the exciton dissociation and act as infrared polarized light *** a result,this PSN device exhibits broadband photo-response from 405 to 1,550 nm without external bias *** optical communication band(1,310 nm),operating at self-driven mode and room temperature,the responsivity and detectivity can reach up to 64.2 mA·W^(–1)and 2.2×10^(11)Jones,respectively,along with fast speed on the order of ***,the device simultaneously exhibits exceptional detection capability for infrared polarized light,demonstrating the anisotropic photocurrent ratio of 1.55 at 1,310 nm and 2.02 at 1,550 nm,which is attributed to the strong in-plane optical anisotropy of middle 1T-MoTe_(2)*** work develops a new photodetector scheme with novel PSN architecture toward broadband,self-power,polarized light sensing and imaging modules.

关键词： self-powered broadband photodetector van der Waals heterojunction PSN architecture

Comprehensive utilization of kaolin ore accompanying muscovite

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 Central South University 2010年第5期17卷 954-958页

作者：喻连香王海东邱冠周梁冬云 school of Mineral Processing and Bioengineering Central South University Mineral Processing Engineering Research Department Guangzhou Research Institute of Non-ferrous Metals

In light of the problems of low-quality and low degree of comprehensive utilization of Guangdong muscovite-type kaolin, the reasons affecting the quality of kaolin were found to be a small amount of maroon powdery goethite adhering to the surface of kaolin and minor muscovite affecting the firing whiteness of products. The ores were dealt with by using the new combined process of attritioning-classifieation-bleaching and flotation. The separation of kaolin from muscovite, quartz and feldspar can come true through the new process. The high-quality kaolin with the firing whiteness of 91% can be obtained, and the muscovite is comprehensively recovered by adopting the key technology of flotation. The content of high-purity muscovite produced is over 99%. The muscovite discarded by original process can be comprehensively recovered.

关键词： muscovite-type kaolin flotation goethite desliming

Retinal damage after exposure to white light emitting diode lights at different intensities in Sprague-Dawley rats

在线全文

学校读者我要写书评

暂无评论

Annals of Eye Science 2019年第1期4卷 89-96页

作者： Guangsen Wu Xiaoyou Huang He Meng Le Yang Shengjian Lin Yang Gao Yujun Li Yandong Wang guangzhou No.16 middle school Guangzhou 510080China Department of Pharmacy&State Key Laboratory of Ophthalmology Zhongshan Ophthalmological CenterSun Yat-sen UniversityGuangzhou 510060China

Background:The usage of the light emitting diode(LED)has been increasingly applied in the illumination setting and electronic ***,the effect of LED lights on the retina remains *** this study,we observed and analyzed the impact of white LED lights at different intensities on the function and morphology of rat ***:Thirty-six Sprague-Dawley rats weighing 150-180 g were randomly divided into six groups(n=6 in each group)including a normal control(NC)group,4 white LED groups at different light intensities(4,000,6,000,7,000,and 10,000 lux),and an ultraviolet B(UVB)lighting group(302 nm,1,000μw/cm2).After 24 hours of continuous illumination,full-field flash electroretinogram(FERG)and pathological examination were performed in each ***:As revealed by FERG,the impairment of retinal function gradually worsened with the increase of LED light *** contrast,the UVB group had the most severe retinal function ***,the functional damage of rod cells and inner nuclear layer cells was the main FERG finding in each *** the NC group,the retina had typical morphologies featured by well-defined structures,clearly visible border between the inner and outer segments,and neatly arranged inner and outer nuclear layer *** 24 hours of illumination,the inner and outer parts of the retina in the 4,000 lux group were still neatly arranged,along with a clear border;however,the inner and outer nuclear layers were randomly arranged,and some irregular nuclei and cells were *** damage of the internal and external retinal segments and the internal and external nuclear layers became more evident in the 6,000 lux group,7,000 lux group,and 10,000 lux *** UVB group had a more obviously disordered arrangement of inner and outer nuclear layers and loss of ***:Continuous exposure to white LED light can cause structural and functional damage to rat retinas,and such damage is related to the intensity of

关键词： Retina light damage light emitting diode(LED) ultraviolet B(UVB) rat

Petrogenetic differences between the middle-Late Jurassic Cu-Pb-Zn-bearing and W-bearing granites in the Nanling Range,South China： A case study of the Tongshanling and Weijia deposits in southern Hunan Province

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

Science China Earth Sciences 2017年第7期60卷 1220-1236页

作者： HUANG XuDong LU JianJun Stanislas SIZARET WANG RuCheng MA DongSheng ZHANG RongQing ZHAO Xu WU JinWei State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China Institut des Sciences de la Terre d'Orleans UMR 7327-CNRS/Université d'Orleans/BRGM Orleans 45071 France Chinese Academy of Sciences Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

The middle-Late Jurassic Cu-Pb-Zn-bearing and W-bearing granites in the Nanling Range have distinctly different mineralogical and geochemical signatures. The Cu-Pb-Zn-bearing granites are dominated by metaluminous amphibole-bearing granodiorites, which have higher CaO/(Na2O+K2O) ratios, light/heavy rare earth element(LREE/HREE) ratios, and δEu values,lower Rb/Sr ratios, and weak Ba, Sr, P, and Ti depletions, exhibiting low degrees of fractionation. The W-bearing granites are highly differentiated and peraluminous, and they have lower CaO/(Na2O+K2O) ratios, LREE/HREE ratios, and δEu values,higher Rb/Sr ratios, and strong Ba, Sr, P, and Ti depletions. The Cu-Pb-Zn-bearing granites were formed predominantly between155.2 and 167.0 Ma with a peak value of 160.6 Ma, whereas the W-bearing granites were formed mainly from 151.1 to 161.8Ma with a peak value of 155.5 Ma. There is a time gap of about 5 Ma between the two different types of ore-bearing *** on detailed geochronological and geochemical studies of both the Tongshanling Cu-Pb-Zn-bearing and Weijia W-bearing granites in southern Hunan Province and combined with the other middle-Late Jurassic Cu-Pb-Zn-bearing and W-bearing granites in the Nanling Range, a genetic model of the two different types of ore-bearing granites has been proposed. Asthenosphere upwelling and basaltic magma underplating were induced by the subduction of the palaeo-Pacific plate. The underplated basaltic magmas provided heat to cause a partial melting of the mafic amphibolitic basement in the lower crust, resulting in the formation of Cu-Pb-Zn mineralization related granodioritic magmas. With the development of basaltic magma underplating,the muscovite-rich metasedimentary basement in the upper-middle crust was partially melted to generate W-bearing granitic magmas. The compositional difference of granite sources accounted for the metallogenic specialization, and the non-simultaneous partial melting of one source followed by the other

关键词： Cu-Pb-Zn-bearing granites W-bearing granites Petrogenesis middle-Late Jurassic Nanling Range

Topological large-area one-way transmission in pseudospin-field-dependent waveguides using magneto-optical photonic crystals

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第6期11卷 1105-1112页

作者： XINYUE YU JIANFENG CHEN ZHI-YUAN LI WENYAO LIANG school of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

We propose a pseudospin-field-dependent waveguide(PFDW)by constructing a sandwiched heterostructure consisting of three magneto-optical photonic crystals(MOPCs)with different geometric *** upper expanded MOPC applied with an external magnetic field has broken time-reversal symmetry(TRS)and an analogous quantum spin Hall(QSH)effect,while the middle standard and the lower compressed ones are not magnetized and *** to the TRS-broken-QSH effect of the upper MOPC,the topological large-area one-way transmission that uniformly distributes over the middle domain is achieved and exhibits the characteristics of a pseudospin-field-momentum-locking;i.e.,pseudospin-down(or pseudospin-up)leftward(or rightward)waveguide state when the positive(or negative)magnetic field is applied on the upper *** further demonstrate the strong robustness of the PFDW against backscattering from various kinds of *** addition,a topological beam modulator that can compress or expand the light beam,and a large-area pseudospin beam splitter have been *** results have potential in various applications such as sensing,signal processing,and optical communications.

关键词： waveguide modulator field

Geochronology of the Dong Tso Ophiolite and the Tectonic Environment

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第6期87卷 1604-1616页

作者： LI Jianfeng XIA Bin XIA Lianze XU Lifeng LIU Weiliang CAI Zhourong YANG Zhiqing State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry The Chinese Academy of Science school of Marine Sciences Sun Yat–Sen University Guang Dong Noferrous Metal Engineering Investigation Design Institute school of Marine Sciences Sun Yat-Sen University Beijing SHRIMP Centre Chinese Academy of Geological Sciences

The wedge shaped Dong Tso ophiolitic block is distributed near the transition point from the western to the middle sub-belt of the Bangong-Nujiang suture *** ophiolite is characterized by well-developed cumulate rocks that are mainly composed of cumulate and massive *** the cumulate gabbros,the adcumulate amphiboles are distributed extensively around the plagioclase and residual pyroxene grains; hence,the rocks are named adcumulate *** this study,the formation age of the ophiolite has been estimated to be 166 ± 4 million years （Ma） by the sensitive high-resolution ion microprobe （SHRIMP） Ⅱ U-Pb isotopic analysis of the zircons from the adcumulate amphibole-gabbro; the 40Ar/39Ar plateau age was estimated to be 148.19 ± 1.53 Ma,which should represent the emplacement time of the ophiolite,by isotopic dating of the pure amphibole mineral from the *** different suits of volcanic lavas have been recognized in this *** purple colored pillow basalts have high TiO2 and P2O5 contents,and are rich in light rare earth elements （LREEs）,large-ion lithospheric elements （LILEs） and high-field-strength elements （HFSEs）,the characteristics that are the typical of the oceanic island basalt （OIB）.On the other hand,other massive basaltic andesites of celadon color are poor in MgO; rich in Fe2O3,LREEs,LILEs,and HFSEs; and especially characterized by negative Nb and Ta anomalies,the properties that establish the andesites as continental arc volcanic *** is concluded that hotspots had developed in the old Dong Tso basin,the oceanic basin that had been developing from middle Jurassic （166 Ma） or even before and emplaced northward in late Jurassic （about 148 Ma）.

关键词： Ophiolite SHRIMP U-Pb age 40Ar/39Ar age Tectonic evolution Dong Tso