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Li^(+)doping induced zero-thermal quenching in Cs_(3)Zn_(6-x-y)B_(9)O_(21):xEu^(3+),yLi^(+)(0≤x≤0.10,0.06≤y≤0.16)

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Journal of Rare Earths 2023年第10期41卷 1478-1486,I0001页

作者： Yuxing Bai Liwei wu Qilin Cheng Li wu Yongfa Kong Yi Zhang Jingjun Xu Key Laboratory of Weak-Light Nonlinear photonics Ministry of EducationSchool of PhysicsNankai UniversityTianjin300071China College of Science Civil Aviation University of ChinaTianjin300300China Institute of photo-electronic Thin Film Devices and Technology Nankai UniversityTianjin300071China

Thermal stability is a crucial index to assess application value of high-power LEDs,which is related to lattice ***,an effective structure-engineering strategy is proposed to achieve excellent *** the 394 nm excitation,Cs_3Zn_(5.94)B_9O_(21):0.06Eu^(3+)possesses two characteristic emissions peaked at 591 and 612 nm with limited thermal *** introducing Li^(+)ions into the lattice,the sample exhibits high color purity and excellent zero-thermal quenching because the defect contents of the phosphor can be effectively modulated via charge-compensation ***,under the stimulus of high temperature,the corresponding trap levels with a suitable depth(E=1.27 eV)will release electrons to recombine with the luminescent centers,compensating for the energy *** study provides a meaningful guide for optimizing and designing novel functional photoluminescent materials.

关键词： photoluminescence Charge compensation Lattice defects Thermal stability Rare earths

Surface functionalized Pt/SnNb_(2)O_(6)nanosheets for visible-light-driven the precise hydrogenation of furfural to furfuryl alcohol

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Journal of Energy Chemistry 2022年第3期31卷 566-575,I0015页

作者： Yingzhang Shi Huan Wang Zhiwen Wang Cheng Liu Mingchuang Shen Taikang wu Ling wu State Key Laboratory of photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116FujianChina State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of ScienceFuzhou 350002FujianChina

photocatalytic upgrading of renewable biomass is a promising way to relieve energy crisis and environmental ***,low photocatalytic efficiency and uncontrollable selectivity still limit its ***,ultrathin SnNb_(2)O_(6)nanosheets with high dispersed Pt nanoparticles(Pt/SN)were successfully developed as an efficient photocatalyst for the precise hydrogenation of furfural(FUR)to furfuryl alcohol(FOL)under visible light irradiation and exhibited the high conversion of FUR(99.9%)with the high selectivity for FOL(99.9%).It was revealed that SN with only 4.1 nm thickness possess good separation ability of photo-generated carriers and abundant surface Lewis acid sites(Nb^(5+))which would selectively chemisorb and activate FUR molecules via the Nb···O=C ***,Pt nanoparticles would gather photo-generated electrons for greatly promoting the generation of active H species to support the hydrogenation of FUR to *** synergistic effects between SnNb_(2)O_(6)nanosheets and Pt nanoparticles remarkably facilitate the photocatalytic performance for *** work not only confirms the great potential of ultrathin nanosheet photocatalyst with functional metal sites for precise upgrading of biomass but also provides an in-depth view to understand the surface/interface interaction between reactant molecules and surface sites of a photocatalyst.

关键词： Biomass conversion Hydrogenation of furfural Two-dimensional materials Sn2NbO6 nanosheet Pt nanoparticle photocatalysis

Analysis of receptor-ligand binding by photoaffinity cross-linking

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Science China Chemistry 2014年第2期57卷 232-242页

作者： XU Bin wu Ling Department of Biochemistry and Center for Drug Discovery Virginia TechBlacksburgVA 24061USA

photoaffinity cross-linking is a fast developing technology for biomolecular interactions,including receptor-ligand *** chemical mechanisms of the most commonly used photoactivatable probes and their respective photochemistry are *** review focuses on the expanding utilities of this technology as a result of recent advances in the(i)identification of receptor contact sites,(ii)monitoring ligand-induced receptor conformational changes,(iii)identification of global binding surfaces,(iv)binding mode analysis using bifunctional photo-probes,(v)application of biosynthetic photo-probes,and(vi)examples of novel target discovery using this *** and future potential of this approach are also discussed.

关键词： photoaffinity cross-linking receptor-ligand interaction photoscanning bifunctional photo-probe biosynthetic photo-probe novel receptor discovery

Effect of dihedral angle of bridge unit on the performance of dye-sensitized solar cell

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Chinese Chemical Letters 2016年第6期27卷 927-932页

作者： Yun wu Xin Li School of Chemical and Environmental Engineering Shanghai Institute of Technology Shanghai 201418 China Division of Theoretical Chemistry and Biology School of Biotechnology KTH Royal Institute of Technology SE-10691 Stockholm Sweden Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

In this work, we investigated the impact of bridge unit on their photo-physical and photovoltaic performance. Increased planarity of the dyes effectively extended the absorption, but reduces the efficiency. Interestingly we found that dyes with a thiophene conjugate unit showed inferior performance when compared with benzene. Theoretical computation indicates a large dihedral angle in the latter system. EIS analysis evidenced the severe recombination in the thiophene-based dye,showing that good planarity may lead to dye aggregation and decrease the efficiency.

关键词： Planarity Recombination Dihedral angle Dye-loading Solar cell

锡掺杂对氧化锌纳米柱阵列结构与光电性能的影响

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功能材料与器件学报 2024年第2期 74-78页

作者：汤小兰吴振英苏州工业职业技术学院电子与通信工程系江苏苏州215104

选择不同的Sn浓度,以溶胶凝胶法在N型重掺杂基板上制备了系列Zn_(1-x)Sn_(x)O(x=0.01-0.07)纳米柱样品,并在不同温度下(500℃、600℃、700℃)进行了退火热处理。利用光/暗电流测试对样品的光电性能进行了表征,发现当偏压为5V时,在600℃... 详细信息

选择不同的Sn浓度,以溶胶凝胶法在N型重掺杂基板上制备了系列Zn_(1-x)Sn_(x)O(x=0.01-0.07)纳米柱样品,并在不同温度下(500℃、600℃、700℃)进行了退火热处理。利用光/暗电流测试对样品的光电性能进行了表征,发现当偏压为5V时,在600℃退火1小时后,x=0.04的样品表现出最佳的光/暗电流变化比(600%)。XRD与FE-SEM结果显示该纳米柱样品具有最大的长度以及较好的结晶度,意味着样品具有较高的结晶质量;PL测试发现x=0.04时样品缺陷浓度最小,这说明在该缺陷浓度下锡对锌进行替代时产生了更多的载流子,从而导致了最优的光电性能。

关键词：锡掺杂氧化锌光电性能溶胶凝胶法

Preparation of fine copper powders and their application in BME-MLCC

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Journal of University of Science and Technology Beijing 2006年第3期13卷 250-255页

作者： Songping wu Haoli Qin Pu Li College of Chemistry South China University of Technology Guangzhou 510641 China

The preparation of fine copper powders by chemical reduction method was investigated. The reaction of [Cu（NH3）4]2^＋ complex with hydrazine hydrate gives spherical monodispersed fine copper powders. The spherical copper powder with a uniform size of 3.5 ± 0.5 μtm was processed to obtain flake copper powder having a uniform size of 8-10 μm, excellent dispersibility and uniform shape. The spherical copper powder of 2.5 ±0.3 μm in size, flake copper, glass frit and vehicle were mixed to prepare copper paste, which was fired in 910-920℃ to obtain BME-MLCC （base metal multilayer ceramic capacitor） with a dense surface of end termination, high adhesion and qualified electrical behavior. Polarized light photo and SEM were employed to observe the copper end termination of BME-MLCC. The rough interface from the interracial reaction between glass and chip gives high adhesion.

关键词： spherical copper powder flake copper powder chemical reduction BME-MLCC

利用光驱动的生物杂合系统实现CO_(2)转化生产化学品

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Chinese Journal of Catalysis 2024年第5期60卷 294-303页

作者：干雅梅柴甜甜张健高聪宋伟吴静刘立明陈修来江南大学生物工程学院工业生物技术教育部重点实验室江苏无锡214122 江南大学生命科学与健康工程学院江苏无锡214122

太阳能作为清洁能源之一,为缓解化石燃料枯竭和温室气体排放等问题提供了一种高效、经济、可持续的解决方案.自然界中的植物和光合微生物通过自身的光合系统收集并转化太阳能,从而生产生物燃料和生物化学品.然而,由于自然光合系统存在... 详细信息

太阳能作为清洁能源之一,为缓解化石燃料枯竭和温室气体排放等问题提供了一种高效、经济、可持续的解决方案.自然界中的植物和光合微生物通过自身的光合系统收集并转化太阳能,从而生产生物燃料和生物化学品.然而,由于自然光合系统存在光吸收范围相对较窄、光生电子在传输过程中易损耗等问题,限制了太阳能到化学品的转化效率.为了解决上述难题,科研人员模仿自然光合作用中的关键部分,探索构建人工光合系统,相关研究引起了广泛关注.本文通过将碲化镉量子点(CdTe QDs)与大肠杆菌(***)相耦合,构建了一种光驱动无机-生物杂合系统(IBPHS),用于捕获太阳能并驱动CO_(2)转化合成高价值化学品.该系统主要由光催化模块和生物催化模块组成.在光催化模块中,通过生物合成CdTe QDs进行光能捕获,并将其转化为电子.通过敲除***的Cd2+外排蛋白(ZNTA)编码基因,实现了***胞内Cd2+过量积累.通过“时空耦合”方式,并借助共聚焦显微镜、高分辨率透射电镜和X射线能谱分析,确认了CdTe QDs在***胞内的组装合成.利用紫外-可见分光光度计研究了光催化模块对光子的吸收能力.结果表明,光催化模块的吸收峰位于400-420 nm.利用瞬时光电流,评估了光催化模块的光生电子能力.实验发现,该模块可以产生0.07μA光电流,表明完成了光催化模块的构建.在生物催化模块中,将光催化模块产生的电子用于还原NAD+再生NADH.采用NADH生物传感器,分析了***胞内NADH含量,结果表明,在蓝光照射下***胞内NADH含量比黑暗条件下提高了5.1倍.在此基础上,通过表达NADH依赖型乳酸脱氢酶(LDH)将丙酮酸还原为乳酸,在蓝光光照下乳酸积累量达到了0.44 g/L,而黑暗条件下无乳酸积累,从而验证了生物催化模块的有效性.基于光催化模块和生物催化模块,进一步组装构建了IBPSH,用于驱动CO_(2)还原合成甲酸和丙酮酸.在蓝光照射下,IBPHS能够合成0.65 g/L甲酸和0.18 g/L丙酮酸,其CO_(2)利用速率分别达到51.98 mg/gDCW/h和21.92 mg/gDCW/h,超过了光合细菌.综上所述,本文利用光催化模块与生物催化模块相耦合的方式,组装构建了一种新型的人工光合系统,实现了光驱动CO_(2)还原合成高附加值化学品,为理性设计材料-生物杂合系统提供了借鉴,同时也为挖掘绿色生物制造潜力、开发太阳能化学制造平台提供参考.

关键词：人工光合系统 CO_(2)利用光能转换 CdTe生物合成 NADH再生

基于氯化物处理的钙钛矿自供电无电荷传输层光电探测器用于弱光检测

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Science China Materials 2024年第7期67卷 2193-2200页

作者：梁海霞张钧尧高玉山郭璞李立郭子亿吴岳黄佳 School of Materials Science and Engineering Tongji UniversityShanghai 201804China National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji UniversityShanghai 201804China

有机-无机卤化物钙钛矿因其可溶液加工和优异的光电特性而在光电探测器(PD)中得到了广泛应用.然而,基于钙钛矿的PD一般需要电荷传输层提供足够的分离和传输驱动力,这会增加钙钛矿PD的材料成本.本研究通过溶液法制备了基于苯基三甲基氯化... 详细信息

有机-无机卤化物钙钛矿因其可溶液加工和优异的光电特性而在光电探测器(PD)中得到了广泛应用.然而,基于钙钛矿的PD一般需要电荷传输层提供足够的分离和传输驱动力,这会增加钙钛矿PD的材料成本.本研究通过溶液法制备了基于苯基三甲基氯化铵(PTACl)处理的无电荷传输层钙钛矿自供电PD.以(CsFAMA)Pb(BrI)3作为光活性层,这种三元阳离子混合卤化物钙钛矿沉积后的垂直分布差异为电荷分离和传输提供了驱动力,PTACl处理能加强电荷分离和运输.这种PD在自供电模式下表现出优异的光电探测性能,其中光暗电流比为1.8×10^(5),响应度为198 mA W^(−1),探测率为1.48×10^(13)/1.24×10^(11) Jones(暗/噪声电流法计算).没有封装的PD在700 h的测试中也表现出良好的空气稳定性,且该PD对0.64 nW cm^(−2)的弱光仍有明显的响应,PD阵列也验证了这种弱光检测能力.本工作制备的钙钛矿自供电PD为弱光检测的发展提供了一种简单可行的途径.

关键词： photodetectors perovskites weak light detection charge transport layer free

Ni-CeO_(2)黑色防护镀层的光助动电位沉积及光热性能

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材料导报 2024年第14期38卷 77-85页

作者：吴世伟杨雨萌段雪佳蓝世锋李舒铭朱本峰卫国英中国计量大学材料与化学学院杭州310018

镍镀层作为一种重要的工程材料,已经在金属涂装等领域得到了广泛的应用,而二氧化铈作为一种重要的稀土氧化物也引起了学者们极大的关注。本工作利用光助动电位沉积法制备了Ni-CeO_(2)复合黑色镀层,分别研究了光照条件、沉积电位范围和... 详细信息

镍镀层作为一种重要的工程材料,已经在金属涂装等领域得到了广泛的应用,而二氧化铈作为一种重要的稀土氧化物也引起了学者们极大的关注。本工作利用光助动电位沉积法制备了Ni-CeO_(2)复合黑色镀层,分别研究了光照条件、沉积电位范围和沉积温度对镀层结构、组成和性能的影响。采用循环伏安法、塔菲尔极化曲线、接触角测量仪、台阶仪、紫外-可见-近红外分光光度计、发射率测量仪、扫描电子显微镜及附属能谱对不同条件下制备的镀层进行了系列表征。结果表明,光照条件下,沉积电位范围为0~-1.5 V、沉积温度为50℃时制备的Ni-CeO_(2)复合黑色镀层具有最佳的综合性能,其腐蚀电流密度为9.642×10^(-6)A·cm^(-2),水接触角达到125.95°,各波段吸收率均在94%以上且具有0.592的发射率。当沉积电位范围为0~-3.5 V时,镀层具有最高的发射率,达0.757;光照条件除了对CeO_(2)的沉积产生影响之外,也显著提升了Ni的沉积速率。该研究为制备具有高吸收率和发射率的黑色复合镀层提供了一个思路,有望在光热转换和光学仪器中得到应用。

关键词：动电位沉积镍-二氧化铈复合黑色镀层沉积电位沉积温度光照