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166篇 您的检索式:作者名="Yu Jimmy"
    题名 作者 年代 出处 被引量
1WO_3/ZnO复合光催化剂的制备及其光催化性能显示文摘采用沉淀-研磨法制备了一系列不同WO3含量的WO3/ZnO复合光催化剂,应用N2物理吸附、X射线衍射、扫描电镜、傅里叶变换红外光谱、紫外-可见光谱和光致发光谱等手段对催化剂进行了表征,并以λ=365nm的紫外光为光源,评价了该催化剂光催化降解酸性橙II的活性,考察了WO3的复合对WO3/ZnO样品光催化性能的影响.结果表明,当复合2%WO3,并于600°C焙烧时,所制备的WO3/ZnO催化剂活性最高,比纯ZnO的提高了约一倍.合适的煅烧温度可以提高催化剂结晶度,而WO3的复合可抑制ZnO晶粒的长大,提高催化剂比表面积和改善催化剂表面羟基数量,并可抑制光生电子与光生空穴的复合,从而显著提高其光催化脱色活性.余长林 杨凯 舒庆 YU Jimmy C 操芳芳 李鑫 2011催化学报2011,32,4:51
2Ag/BiOX(X=Cl,Br,I)复合光催化剂的制备、表征及其光催化性能显示文摘采用光化学沉积法制备了一系列不同Ag含量的新型Ag/BiOX(X=Cl,Br,I)复合光催化剂,应用X射线粉末衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、光致发光(PL)谱、紫外-可见(UV-Vis)光谱和N2物理吸附等手段对催化剂进行表征,并以420nm<λ<660nm的可见光为光源,评价了该催化剂光催化降解酸性橙II的活性,考察了不同含量的Ag沉积对BiOX样品光催化性能的影响.N2物理吸附测试结果表明,沉积银在一定程度降低了催化剂的比表面积.UV-Vis测试结果表明,Ag能产生表面等离子共振吸收,有效增强BiOCl和BiOBr对可见光的吸收能力.PL测试结果则表明,Ag能显著抑制光生电子(e-)和空穴(h+)的复合.Ag的存在大幅度提高了BiOX对染料的光催化降解活性.当负载Ag的质量分数(w)为1%-2%时,可使BiOCl、BiOBr和BiOI光催化活性分别提高了10、13和2倍.Ag/BiOX复合光催化剂具有更高催化活性的原因是复合光催化剂对可见光有很强的吸收能力,同时产生了银等离子体光催化作用和银抑制了Ag/BiOX(X=Cl,Br,I)的光生电子-空穴的复合.余长林 操芳芳 舒庆 包玉龙 谢志鹏 YU Jimmy C 杨凯 2012物理化学学报2012,28,3:50
3水热合成Bi_2WO_6/ZnO异质结型光催化剂及其光催化性能显示文摘在不同温度下(120~220℃),利用水热法制备了含1wt%、2wt%、4wt%和8wt%Bi2WO6的异质结型Bi2WO6/ZnO复合光催化剂,采用X射线粉末衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射(UV-Vis)吸收光谱及光致发光光谱(PL)等系列手段对所制备的光催化剂进行了表征,并以紫外光(365nm)为光源,酸性橙II为降解对象,进行光催化活性测试,考察了不同Bi2WO6复合量及不同水热温度对ZnO光催化剂反应活性的影响.研究表明,异质结型Bi2WO6/ZnO复合光催化剂的光催化活性明显优于纯ZnO和Bi2WO6.当复合4wt%Bi2WO6水热处理温度为150℃时,所制备的复合光催化剂的光催化活性最佳,为纯ZnO的2.6倍.活性提高的主要原因是形成的Bi2WO6/ZnO异质结能显著降低光生电子和空穴对的复合几率,并改善了异质结型Bi2WO6/ZnO复合光催化剂的表面性能.余长林 杨凯 YU Jimmy C 操芳芳 李鑫 周晓春 2011无机材料学报2011,26,11:31
4Zr–Al共掺对ZnO光催化剂结构和催化性能的影响显示文摘利用水热处理结合焙烧的方法分别制备了Zr、Al掺杂及Zr–Al共掺的ZnO光催化剂。研究了制备的光催化剂样品的相结构和光谱性能;以紫外光(λ=254nm)为光源,酸性橙Ⅱ为降解对象,进行光催化活性测试;考察了Zr、Al掺杂对ZnO光催化剂反应活性的影响。研究表明,制备的产物均为六方晶系纤锌矿结构的ZnO;Zr、Al掺杂及Zr–Al共掺的ZnO样品的光催化活性相对于纯ZnO均有较大程度的提高,而且Zr–Al共掺的ZnO的光催化性能明显优于单一掺杂的。Zr–Al共掺可以明显改善ZnO表面状态,使ZnO具有更丰富的表面羟基,同时可以抑制光生电子–空穴对的复合,从而有利于光催化活性和稳定性的提高。余长林 杨凯 吴琼 YU Jimmy C 樊启哲 许永章 2012硅酸盐学报2012,40,3:16
5超声波辐射快速合成高光催化性能的BiOCl(Br)纳米片(英文)显示文摘在室温条件下,利用超声波辐射方法快速合成了四方状BiOCl(BiOBr)纳米片光催化剂。应用N2-物理吸附、X射线粉末衍射、扫描电镜、透射电镜、紫外可见光谱等手段对催化剂进行了表征,并以波长为λ=365 nm的紫外光和420 nm<λ<660 nm的可见光为光源,评价了该催化剂光催化降解酸性橙Ⅱ的活性。表征结果表明,超声波辐射可加速BiOCl和BiOBr晶化过程,显著提高BiOCl和BiOBr的结晶度,并使其晶粒发生细化,提高催化剂的比表面积。活性测试表明,声化学合成样品的光催化活性优于普通搅拌制备的样品。其中BiOCl的紫外光催化活性高于商业TiO2(P25)光催化剂。余长林 周晚琴 YU Jimmy C 2011无机化学学报2011,27,10:15
6超声波制备介孔结构的氮掺杂TiO_2纳米晶及其可见光催化性能(英文)显示文摘采用超声波辐射法制备了具有介孔结构的高浓度氮掺杂TiO2纳米晶(N/TiO2).采用N2物理吸附、X射线粉末衍射、X射线光电子能谱、透射电镜、光致发光谱和紫外-可见漫反射光谱等手段对N/TiO2进行了表征.以波长为400~660nm的可见光为光源,以水体污染物邻苯二甲酸二甲酯为降解对象,考察了不同制备方法对N/TiO2光催化性能的影响.结果表明,超声波辐射使氮掺杂浓度提高了2.2倍,该法制备的N/TiO2同时具有较好的介孔结构,表现了更高的光催化降解邻苯二甲酸二甲酯的活性.其活性提高的主要原因是N/TiO2含有更高浓度的氮和对可见光具有更强的吸收能力.周晚琴 余长林 樊启哲 魏龙福 陈建钗 YU Jimmy C 2013催化学报2013,34,6:15
7Pt/BiOCl纳米片的制备、表征及其光催化性能显示文摘采用光化学沉积法制备了一系列不同Pt含量的新型Pt/BiOCl纳米片光催化剂,运用N2物理吸附-脱附、X射线粉末衍射、扫描电镜、透射电镜、X射线光电子能谱、光致发光光谱、紫外-可见漫反射光谱等手段对Pt/BiOCl进行了表征,并以λ=254nm的紫外灯和钨灯为光源,考察了Pt含量对Pt/BiOCl光催化降解酸性橙II活性的影响.结果表明,沉积的Pt对BiOCl样品比表面积的影响不大,但可有效增强催化剂对可见光的吸收能力,显著抑制光生电子与空穴的复合.当Pt含量为1%~2%时,能大幅度提高紫外光下BiOCl催化降解染料的活性,并产生可见光活性.这是由于Pt/BiOCl具有一定的可见光吸收能力,产生了Pt纳米粒子的等离子体光催化作用.余长林 陈建钗 操芳芳 李鑫 樊启哲 YU Jimmy 魏龙福 2013催化学报2013,34,2:14
8Ag/TiO2光催化还原硝酸氮显示文摘利用化学还原法制备不同Ag掺杂量TiO2纳米催化剂,采用TEM、XRD、XRF和UV-Vis对催化剂进行表征。考察了催化剂在紫外光(254nm)和可见光照射下还原初始浓度100mgN·L-1水相硝酸氮的活性和效果。重点考察了紫外光照射下Ag掺杂量、不同空穴捕获剂(甲酸、甲醇、乙酸、乙醇、草酸、草酸钠等)及甲酸浓度对硝酸氮还原的影响;对硝酸氮转化率和总氮去除率、形成亚硝酸氮、氨氮浓度及氮气选择性的影响。甲酸浓度为0.030mol·L-1、Ag掺杂量为1.0wt%时催化剂效果最佳。此时,硝酸氮、总氮的转化率分别为98.43%、78.13%;亚硝酸氮浓度为零,转化的硝酸氮中只有20.76%转化为氨氮,氮气选择性为79.24%。可见光下进行光催化还原反应时,硝酸氮转化率仅37.98%,但氮气的选择性较高。柳丽芬 董晓艳 杨凤林 Jimmy C Yu 2008无机化学学报2008,24,2:13
9Grain Size and Wettability of TiO_2/SiO_2 Photocatalytic Composite Thin Filing显示文摘The uniform transparent TiO2/SiO2 photocatalytic composite thin films are prepared by sol-gel method on the soda lime glass substrates, and characterized by UV-visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area, FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the addition of SiO2 to TiO2 thin films can suppress the grain growth of TiO2 crystal, increase the hydroxyl content on the surface of TiO2 films, lower the contact angle for water on TiO2 films and enhance the hydrophilic property of TiO2 films. The super-hydrophilic TiO2/SiO2 photocatalytic composite thin films with the contact angle of 0° are obtained by the addition of 10%-20% SiO2 in mole fraction.Jiaguo Yu, Xiujian Zhao, Jimmy C Yu, Jun Lin (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China Deportment of Chemised The Chinese University of Hong Kong, Hong Kong, 2001Rare Metals2001,20,2:11
10Preparation,characterization and photocatalytic performance of Mo-doped ZnO photocatalysts显示文摘A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grinding-calcination method.The structure of these photocatalysts was characterized by a variety of methods,including N 2 physical adsorption,X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared(FT-IR) spectroscopy,photoluminescence(PL) emission spectroscopy,and UV-vis diffuse reflectance spectroscopy(DRS).It was found that Mo 6+ could enter into the crystal lattice of ZnO due to the radius of Mo 6+(0.065 nm) being smaller than that of Zn 2+(0.083 nm).XRD results indicated that Mo 6+ suppressed the growth of ZnO crystals.The FT-IR spectroscopy results showed that the ZnO with 2 wt.% Mo-doping has a higher level of surface hydroxyl groups than pure ZnO.PL spectroscopy indicated that ZnO with 2 wt.% Mo-doping also exhibited the largest reduction in the intensity of the emission peak at 390 nm caused by the recombination of photogenerated hole-electron pairs.The activities of the Mo-doped ZnO photocatalysts were investigated in the photocatalytic degradation of acid orange II under UV light(λ = 365 nm) irradiation.It was found that ZnO with 2 wt.% Mo-doping showed much higher photocatalytic activity and stability than pure ZnO.The high photocatalytic performance of the Mo-doped ZnO can be attributed to a great improvement in the surface properties of ZnO,higher crystallinity and lower recombination rate of photogenerated hole-electron(e-/h+) pairs.Moreover,the undoped Mo species may exist in the form of MoO3 and form MoO3 /ZnO heterojunctions which further favors the separation of e-/h+ pairs.YU ChangLin YANG Kai SHU Qing YU Jimmy C CAO FangFang LI Xin ZHOU XiaoChun 2012Science China Chemistry2012,55,9:8
11聚乙二醇法在温和条件下制备不同结构的磁性Fe_3O_4纳米晶(英文)显示文摘以Fe(acac)3为原料,乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂和溶剂,在温和的溶剂热的条件下制备了不同尺寸的顺磁性Fe3O4纳米颗粒.利用X射线衍射(XRD)、光电子能谱(XPS)、透射电子显微镜(TEM)和磁性测量技术对制备的Fe3O4纳米颗粒的结构、形貌、磁性能进行了表征测试.结果发现,聚乙二醇分子链的长度对Fe3O4纳米颗粒的平均粒径大小、结晶度和饱和磁化强度均有重要影响.以乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂制备的Fe3O4纳米颗粒的尺寸分别为2~3nm、5nm和7~8nm;相应的纳米Fe3O4颗粒饱和磁化强度分别为55.2、61.5和81.3emu/g;同时结晶度也随分子链的增加而增加.随分子链长度的增加,还原剂还原性的逐渐增加是导致Fe3O4纳米颗粒平均粒径大小、结晶度和饱和磁化强度逐渐增大的重要因素.余长林 温和瑞 YU Jimmy C 2010纳米技术与精密工程2010,8,2:8
12Novel AgCl/Ag_2CO_3 heterostructured photocatalysts with enhanced photocatalytic performance显示文摘A series of novel Ag Cl/Ag_2CO_3 heterostructured photocatalysts with different Ag Cl contents(5 wt%,10 wt%, 20 wt%, and 30 wt%) were prepared by facile coprecipitation method at room temperature. The resulting products were characterized by powder X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), and ultraviolet–visible diffuse reflectance spectroscopy(UV–Vis DRS), respectively. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange(MO) under UV light irradiation. With the optimal Ag Cl content of 20 wt%, the Ag Cl/Ag_2CO_3 composite exhibits the greatest enhancement in photocatalytic degradation efficiency. Its first-order reaction rate constant(0.67 h-1) is5.2 times faster than that of Ag_2CO_3(0.13 h-1), and 16.8times faster than that of Ag Cl(0.04 h-1). The formation of Ag Cl/Ag_2CO_3 heterostructure could effectively suppress the recombination of the photo-generated electron and hole, resulting in an increase in photocatalytic activity.Chang-Lin Yu Long-Fu Wei Jian-Chai Chen Wan-Qin Zhou Qi-Zhe Fan Jimmy Yu 2016Rare Metals2016,35,6:5
13A Lamellar Ceria Structure with Encapsulated Platinum Nanoparticles显示文摘A novel lamellar feather-like CeO_(2) structure has been fabricated by using a triblock copolymer as the structure-directing agent.This material was characterized in detail by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray photoelectron spectroscopy,and BET surface area measurements.Compared with conventional spherical shaped ceria prepared by ammonia gelation,the ceria feathers have superior ability to support nanosized platinum particles due to their special structure.The“skeletons”of ceria feathers can serve as an ideal host matrix to anchor the platinum particles.Furthermore,the inter-crossing pattern of the“skeletons”also acts as a partition to separate platinum particles,allowing the Pt nanoparticles(average diameter~6 nm)to be highly dispersed in the structure.The Pt/feather-like CeO_(2) catalyst exhibits high activity in the water gas shift reaction.Angelo C.Mak Changlin Yu Jimmy C.Yu Zhendong Zhang Chunman Ho 2008Nano Research2008,1,6:5
14Overview of the Shenzhen Emergency Medical Service Call Pattern显示文摘BACKGROUND:In Shenzhen,the Emergency Medical Service(EMS) system has been in service since 1997.This study aims to examine the operation of Shenzhen 120 EMS center and to identify the reasons of calling EMS.METHODS:In this retrospective quantitative descriptive study,the data from the Shenzhen 120 EMS registry in 2011 were analyzed.RESULTS:Shenzhen 120 EMS center is a communication command center.When the number of 120 are dialed,it is forwarded to the closest appropriate hospital for ambulance dispatch.In2011,the Shenzhen 120 EMS center received 153 160 ambulance calls,with an average of 420 calls per day.Calling emergency services was mainly due to traffic accidents.Trauma and other acute diseases constituted a majority of ambulance transports.The adult patients aged 15-60 years are the principal users of EMS.There are no recognized 'paramedic' doctors and nurses.The pre-hospital emergency service is under the operation of emergency departments of hospitals.Shenzhen at present does not have specialized pre-hospital training for doctors and nurses in posttrauma management.Moreover,specialized pre-hospital training,financial support,and public health education on proper use of EMS should be emphasized.CONCLUSION:The Shenzhen 120 EMS center has its own epidemiology characteristics.Traumatic injury and traffic accident are the main reasons for calling ambulance service.In-depth study emphasizing the distribution and characteristics of trauma patients is crucial to the future development of EMS.Shuk Man Lo Yi Min Yu Lap Yip Larry Lee Mi Ling Eliza Wong Sek Ying Chair Edward J Kalinowski Tak Shing Jimmy Chan 2012World Journal of Emergency Medicine2012,3,4:4
15室温下超声波辐照制备介孔结构的TiO_2及其光催化性能显示文摘在室温条件下,利用超声波辐照方法合成了一系列具有大比表面积的介孔结构TiO_2光催化剂。应用N_2-物理吸附、X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等手段对合成的样品进行了表征。考察了超声波强度、发射时间对TiO_2的结晶度、比表面积、孔体积、孔径等物理结构的影响,并提出了超声波辐照下TiO_2的介孔结构的形成机理。以λ=365 nm的紫外光为光源,评价了该系列催化剂光催化降解染料甲基橙的性能。结果表明超声波功率的增加将增加TiO_2的结晶度和孔径,并使其晶粒发生细化,提高催化剂的分散性。声化学合成的样品具有较高的光催化活性,其主要原因是超声波辐照方法合成的TiO_2具有较高的结晶度和较大的比表面积和孔体积。余长林 周晚琴 操芳芳 李鑫 YU Jimmy C 2012声学学报2012,37,4:4
16Fibrous TiO_2 prepared by chemical vapor deposition using activated carbon fibers as template via adsorption,hydrolysis and calcinations显示文摘TiO2 fibers were prepared via alternatively introducing water vapor and Ti precursor carried by N2 to an APCVD(chemical vapor deposition under atmospheric pressure) reactor at ≤200 °C. Activated carbon fibers(ACFs) were used as templates for deposition and later removed by calcinations. The obtained catalysts were characterized by scanning electron microscopy(SEM) ,transmission electron microscopy(TEM) ,Brunauer,Emmett and Teller(BET) and X-ray diffraction(XRD) analysis. The pores within TiO2 fibers included micro-range and meso-range,e.g.,7 nm,and the specific surface areas for TiO2 fibers were 141 m2/g and 148 m2/g for samples deposited at 100 °C and 200 °C(using ACF1700 as template) ,respectively. The deposition temperature significantly influenced TiO2 morphology. The special advantages of this technique for preparing porous nano-material include no consumption of organic solvent in the process and easy control of deposition conditions and speeds.Hui-na YANG Li-fen LIU Feng-lin YANG Jimmy C. YU 2008Journal of Zhejiang University-Science A(Applied Physics & Engineering)2008,9,7:2
17Preparation of bismuth oxyiodides and oxides and their photooxidation characteristic under visible/UV light irradiation显示文摘Changlin Yu Caifeng Fan Jimmy C. Yu Wanqin Zhou Kai Yang 2010Materials Research Bulletin2010,,:2
18Recent advances on study of hadrosaurid dinosaurs in Heilongjiang(Amur) River area between China and Russia显示文摘Four main dinosaur-bearing sites have been investigated in latest Cretaceous deposits from the Amur/Heilongjiang Region: Jiayin and Wulaga in China (Yuliangze Formation) ,Blagoveschensk and Kundur in Rus- sia (Udurchukan Formation) . More than 90% of the bones discovered in these localities belong to hollowcrested lambeosaurine hadrosaurids: Charonosaurus jiayinensis at Jiayin,Amurosaurus riabinini at Blagoveschensk, Olorotitan arharensis at Kundur,and Sahaliyania elunchunorum at Wulaga. Flat-headed hadrosaurine hadrosau- rids are much less numerous,but appear well diversified as well: Kerberosaurus manakini at Blagoveschensk, Wulagasaurus dongi at Wulaga,and a new genus at Kundur. Theropods are represented by shed teeth and isolated bones; isolated scutes and teeth discovered at Kundur are tentatively attributed to nodosaurids. Palynologi- cal studies suggest that these sites are probably synchronous with the Lancian' vertebrate localities of western North America,which represent the youngest dinosaur faunas in this area. However,the latest Cretaceous dinosaur assemblages are completely different in the Amur/Heilongjiang region (lambeosaurines abundant,ceratopsids absent) and in western North America (ceratopsids abundant,lambeosaurines extremely rare or absent) . This probably reflects some kind of geographical barrier between both areas by Maastrichtian time rather than strong differences in palaeoecological conditions.Pascal Godefroit Pascaline Lauters Jimmy Van Itterbeeck Yuri L. Bolotsky DONG Zhiming JIN Liyong WU Wenhao Ivan Y. Bolotsky HAI Shulin YU Tingxiang 2011Global Geology2011,14,3:2
19Clinical characteristics of patients with congenital long QT syndrome and bigenic mutations显示文摘Juang Jyh-Ming Jimmy Chen Ching-Yu Yeh Huei-Ming Chiu Wei-Yih Yu Chih-Chieh Liu Yen-Bin Tsai Chia-Ti Lo Li-Wei Yeh Shih-Fan Sherri Lai Ling-Ping 2014Chinese Medical Journal2014,,8:2
20Effects of F-doping on the photo-catalytic activity and microstructures of nano-crystalline TiO2powders 显示文摘YU JIMMY C YU Jia Guo HO Wing Kei 2002Chem Mater2002,14,9:1
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