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Enhanced afterglow performance of CaAl_(2)O_(4):Eu^(2+),Nd^(3+) phosphors by co-doping Gd^(3+)

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Journal of Rare Earths 2021年第8期39卷 930-937页

作者： mingxi zhang Fengfeng Li Yongcheng Lin Yan Li Yi Shen Light Alloy Research Institute of Central South University Changsha 410083China Key Laboratory of Inorganic Nonmetallic Materials Hebei Province Key Laboratory of Environment Functional Materials of Tangshan CityCollege of Materials Science and EngineeringNorth China University of Science and TechnologyTangshan 063210China School of Mechanical and Electrical Engineering.Central South University Changsha 410083China

In order to effectively improve the afterglow properties of CaAl_(2)O_(4):Eu^(2+),Nd^(3+) phosphors,a series of Ca_(0.982-x)Al_(2)O_(4):0.012 Eu^(2+),0.006 Nd^(3+),xGd^(3+)(x=0,0.012,0.024,0.036,0.048,0.060 mol) phosphors were prepared by a high-temperature solid-phase *** composition and microstructure were characterized by XRD,TEM,HRTEM,and XPS,luminescence properties were systematically analyzed by fluorescence spectra,afterglow decay curves and TL glow *** show that all of Ca_(0.982-x)Al_(2)O_(4):0.012 Eu^(2+),0.006 Nd^(3+),xGd^(3+)phosphors belong to monoclinic CaAl_(2)O_(4),without other cystalline *** blue emission at 442 nm is observed,which is assigned to the 4f^(6)5 d→4f^(7) transition of Eu^(2+) *** with appropriate amount of Gd^(3+) ions(x=0.036 mol) significantly improves the afterglow properties of phosphors,but the excessive doping of Gd^(3+) induces the fluorescent *** doping of moderate Gd^(3+) changes the traps states,the trap depth varies from 0.598 to 0.644 eV and the trap concentration is also greatly improved,thus significantly improving afterglow performance.

关键词： CaAl_(2)O_(4):Eu^(2+),Nd^(3+) Gd^(3+)ions Afterlow Trap depth Mechanism Rare earths

Chiral polymer-based biointerface materials

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Science China Chemistry 2014年第4期57卷 540-551页

作者： LI MinMin QING GuangYan zhang mingxi SUN TaoLei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Chirality is a unique phenomenon in nature. Chiral interactions play an important role in biological and physiological process- es, which provides much inspiration for scientists to develop cbiral materials. As a breakthrough from traditional materials, bi- ointerface materials based on chiral polymers have attracted increasing interest over the past few years. Such materials ele- gantly combine the advantages of chiral surfaces and traditional polymers, and provide a novel solution not only for the inves- tigation of chiral interaction mechanisms but also for the design of biomaterials with diverse applications, such as in tissue en- gineering and biocompatible materials, bioregulation, chiral separation and chiral sensors. Herein, we summarize recent ad- vances in the study of chiral effects and applications of chiral polymer-based biointerface materials, and also present some challenges and perspectives.

关键词： chirality polymer chiral interaction biointerface materials chiral effects applications

Sol-gel preparation and phosphorescence property of Mn^(2+)-doped zinc boro-silicate glass thin films

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Rare Metals 2011年第3期30卷 298-303页

作者： LI Fengfeng zhang mingxi HOU Guiqin SHEN Yi LIU Zhigang LI Hongsheng College of Light Industry Hebei Polytechnic University Tangshan 063000 China Key Laboratory for Inorganic Non-metallic Materialogy of Hebei Province College of Materials Science and Engineering Hebei Polytechnic University Tangshan 063009 China

Mn2＋-doped zinc borosilicate （ZBSM） glass thin films were first synthesized by sol-gel method. In the experiment, a thin gel film was depos-ited onto quartz glass substrates by dip-coating method and then heat-treated to form a Mn2＋-doped zinc borosilicate glass thin film. Long lasting phosphorescence （LLP） and photo-stimulated long lasting phosphorescence （PSLLP） were found in the film sample. According to fluorescence spectra, LLP emission spectra, and PSLLP emission spectra, both LLP and PSLLP emissions are attributed to the energy level transition of 4Eg→4A1g from Mn2＋. Both the phosphorescence intensity decay curves contain a fast decay component and another slow decay one. The thermoluminescence （TL） spectra show that the sample has two kinds of traps at least and their energy level values are about 0.8 eV and 1.02 eV, which could be estimated by the Randall and Willcins formula. The infrared absorption spectra （IR） consist of characteristic vi-bration bands of Si-O-Si, Si-O-Zn, B-O in [BO3], B-O group, and Zn-O in [ZnO4]. Moreover, image storage and logical operation of the ZBSM film were carried out successfully through an experiment analogues of optical storage.

关键词： thin films borosilicate glass zinc borosilicate manganese doping sol-gel process phosphorescence

Zn-doping enhances the photoluminescence and stability of PbS quantum dots for in vivo high-resolution imaging in the NIR-II window

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Nano Research 2020年第8期13卷 2239-2245页

作者： Xiulei Shi Song Chen Meng-Yao Luo Biao Huang Guozhen zhang Ran Cui mingxi zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070WuhanChina Key Laboratory of Analytical Chemistry for Biology and Medicine(Ministry of Education) College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Hefei National Laboratory for Physical Science at the MicroscaleUniversity of Science and Technology of ChinaHefei230026China

Lead sulfide(PbS)quantum dots(QDs)are important near infrared(NIR)luminescent materials with tunable and strong emission covering a broad NIR ***,their optical properties are quite sensitive to air,water,and high temperature due to the surface oxidation,thus limiting their applications in optoelectronic devices and biological ***,a cation-doping strategy is presented to make a series of high-quality Zn-doped PbS QDs with strong emission covering whole second near-infrared window(NIR-II,1,000-1,700 nm).First-principle calculations confirmed that Zn dopants formed dopant states and decreased the recombination energy gap of host ***,the Zn dopants significantly improved the quantum yield,photoluminescence lifetime and thermal stability of PbS ***,the PEGylated Zn-doped PbS QDs emitting in the NIR-llb window(1,500-1,700 nm)realized the noninvasive imaging of cerebral vascular of mouse with high resolution,being able to distinguish blood *** material not only provides a new tool for deep tissue fluorescence imaging,but is also promising for the development of other NIR related devices.

关键词： quantum dots doping second near-infrared window(NIR-II window) tunable emission in vivo imaging

Preparation of aluminum borate whisker reinforced aluminum phosphate wave-transparent materials

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Chinese Science Bulletin 2008年第19期53卷 3073-3076页

作者： LU ZhenYu GENG HaoRan zhang mingxi HOU XianQin School of Materials Science and Engineering Jinan University Jinan 250022 China Research Institute for Special Structures of Aeronautical Composites AVIC Ⅰ Jinan 250023 China

Aluminum borate whisker/aluminum phosphates composites were prepared with normal pressure sintering. It was found that the aluminum borate whisker was effective to suppress the crystallization of aluminum phosphates in the aluminum borate whisker/aluminum phosphates composites and contributed to the improvement of the mechanical properties. After sintered at 1050℃ for 1 h, the flexural strength of the composites with 30 vol% aluminum borate whisker addition reached 215.3 MPa. The dielectric constant and loss tangent of the composites were 4.23 and 0.0024 at 10 GHz.

关键词：透明材料天线硼酸盐金属须

Ultra-bright near-infrared-IIb emitting Zn-doped Ag_(2)Te quantum dots for noninvasive monitoring of traumatic brain injury

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Nano Research 2023年第2期16卷 2719-2727页

作者： Yifei Zhou Biao Huang Shi-Hui Chen Shu-Lin Liu mingxi zhang Ran Cui College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular RecognitionResearch Centre for Analytical SciencesCollege of ChemistryNankai UniversityTianjin 300071China

The long-wavelength region of the near-infrared-IIb(NIR-IIb,1,500–1,700 nm)imaging window has become an ideal window for in vivo imaging due to the suppressed photon scattering and near-zero autofluorescence of biological ***,it is necessary to develop fluorescent probes with excellent fluorescence performance and stability for NIR-IIb fluorescence *** this work,zinc-doped silver telluride quantum dots(Zn:Ag_(2)Te QDs)with bright fluorescence in the NIR-IIb window were *** introduction of Zn dopants inhibited crystal defects and reduced non-radiative ***,the quantum yield and fluorescence lifetime of Zn:Ag_(2)Te QDs were significantly *** addition,Zn-doping increased the number of ligands on the surface of QDs,thus enhancing the colloidal stability of Zn:Ag_(2)Te ***,the PEGylated Zn:Ag_(2)Te QDs with high absolute quantum yield realized noninvasive imaging of cerebral vascular of mouse with high resolution able to distinguish blood capillary,which could be utilized to monitor the brain condition of mice after traumatic brain injury.

关键词： near-infrared-IIb(NIR-IIb)window silver telluride quantum dots fluorescence in vivo imaging

Imaging-guided precision oncotherapy mediated by nanoprobes: From seeing to curing

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Chinese Chemical Letters 2024年第1期35卷 116-128页

作者： Jie Zheng Shi-Hui Chen Biao Huang mingxi zhang Quan Yuan Ran Cui College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Jiangxia Laboratory Wuhan 430200China

Malignant tumors are the main diseases threatening human life. Using precise theranostics to diagnose and cure tumors has emerged as a new method to improve patient survival. Based on the current development of precise tumor imaging, image-guided tumor therapy has received widespread attention because it is beneficial for developing precise treatment of tumors, has the potential to improve the efficacy of tumor therapy and reduce the incidence of adverse side effects. Nanoprobes, which are nanomaterial functionalized with specific biomolecules, have intrigued intense interest due to their great potential in monitoring biorecognition and biodetection evens. Benefiting from the unique advantages of nanomaterials, including the easy surface functionalization, the unique imaging performances, and the high drug loading capacity, nanoprobes have become a powerful tool to simultaneously realize tumor precise imaging, diagnosis, and therapy. This review introduces the non-invasive tumor precise imaging and highlights the recent advances of image-guided oncotherapy mediated by nanoprobes in anti-tumor drug delivery, tumor precise surgical navigation, chemodynamic therapy, and phototherapy. Finally, a perspective on the challenge and future direction of nanoprobes in imaging-guided tumor theranostics is also discussed.

关键词： Precise theranostics Imaging-guided Tumor surgical navigation Chemodynamic therapy Phototherapy Nanoprobes

Recent advances in nickel-based catalysts in eCO_(2)RR for carbon neutrality

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Carbon Energy 2024年第2期6卷 61-91页

作者： Weikang Peng Fengfeng Li Shuyi Kong Chenxi Guo Haotian Wu Jiacheng Wang Yi Shen Xianguang Meng mingxi zhang Hebei Key Laboratory of Inorganic Nonmetallic Materials School of Materials Science and EngineeringNorth China University of Science and TechnologyTangshanHebeiChina Hebei Iron and Steel Laboratory North China University of Science and TechnologyTangshanChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina School of Materials Science and Engineering Taizhou UniversityZhejiangChina

The excessive use of nonrenewable energy has brought about serious greenhouse *** CO_(2) into high-value-added chemicals is undoubtedly the best choice to solve energy *** to the excellent cost-effectiveness and dramatic catalytic performance,nickel-based catalysts have been considered as the most promising candidates for the electrocatalytic CO_(2) reduction reaction(eCO_(2)RR).In this work,the electrocatalytic reduction mechanism of CO_(2) over Ni-based materials is *** strategies to improve the eCO_(2)RR performance are ***,the research on Ni-based materials for syngas generation is briefly ***,the prospects of nickel-based materials in the eCO_(2)RR are provided with the hope of improving transition-metal-based electrocatalysts for eCO_(2)RR in the future.

关键词： carbon energy carbon neutrality CO_(2)reduction electrocatalysis nickel-based materials

Perfecting and extending the near-infrared imaging window

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Light(Science & Applications) 2021年第10期10卷 1949-1966页

作者： Zhe Feng Tao Tang Tianxiang Wu Xiaoming Yu Yuhuang zhang Meng Wang Junyan Zheng Yanyun Ying Siyi Chen Jing Zhou Xiaoxiao Fan Dan zhang Shengliang Li mingxi zhang Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310058 HangzhouChina Intelligent Optics&Photonics Research Center Jiaxing Institute of Zhejiang University314000 JiaxingZhejiang ProvinceChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina Key Laboratory of Reproductive Genetics(Ministry of Education) Department of Reproductive EndocrinologyWomen’s HospitalZhejiang University School of Medicine310006 HangzhouChina College of Pharmaceutical Sciences Soochow University215123 SuzhouChina

In vivo fluorescence imaging in the second near-infrared window(NIR-II)has been considered as a promising technique for visualizing ***,the definition of the NIR-II region and the mechanism accounting for the excellent performance still need to be ***,we simulate the photon propagation in the NIR region(to 2340 nm),confirm the positive contribution of moderate light absorption by water in intravital imaging and perfect the NIR-II window as 900–1880 nm,where 1400–1500 and 1700–1880 nm are defined as NIR-IIx and NIR-IIc regions,***,2080–2340 nm is newly proposed as the third near-infrared(NIR-III)window,which is believed to provide the best imaging *** wide-field fluorescence microscopy in the brain is performed around the NIRIIx region,with excellent optical sectioning strength and the largest imaging depth of intravital NIR-II fluorescence microscopy to *** also propose 1400 nm long-pass detection in off-peak NIR-II imaging whose performance exceeds that of NIR-IIb imaging,using bright fluorophores with short emission wavelength.

关键词： perfect Perfect fir