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Quantum dots assisted in vivo two-photon microscopy with NIR-Ⅱemission

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Photonics Research 2022年第1期10卷 189-196页

作者： HUWEI NI YALUN WANG TAO TANG WENBIN YU DONGYU LI MUBIN HE RUNZE CHEN 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 UniversityHangzhou 310058China SIEE(Sussex AI Institute) Zhejiang Gongshang UniversityHangzhou 310018China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

With the advantages of high resolution and deep penetration depth,two-photon excited NIR-Ⅱ(900–1880 nm)fluorescence(2PF)microscopic bioimaging is ***,due to the lack of imaging systems and suitable probes,few such works,to our best knowledge,were demonstrated utilizing NIR-II excitation and NIR-Ⅱfluorescence ***,we used aqueously dispersible Pb S/Cd S quantum dots with bright NIR-II fluorescence as the contrast *** the excitation of a 1550 nm femtosecond(fs)laser,they emitted bright 2 PF in the NIR-Ⅱ***,a 2PF lifetime imaging microscopic(2PFLIM)system was implemented,and in vivo 2PFLIM images of mouse brain blood vessels were obtained for the first time to our best *** improve imaging speed,an in vivo two-photon fluorescence microscopy(2 PFM)system based on an In Ga As camera was implemented,and in vivo 2PFM images of QDs-stained mouse brain blood vessels were obtained.

关键词： excitation photon system

Berlin Green Framework‑Based Gas Sensor for Room‑Temperature and High‑Selectivity Detection of Ammonia

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Nano-Micro Letters 2021年第4期13卷 146-158页

作者： Tingqiang Yang Lingfeng Gao Wenxuan Wang Jianlong Kang Guanghui Zhao Delong Li Wen Chen Han Zhang Institute of Microscale Optoelectronics Collaborative Innovation Centre for Optoelectronic Science and TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro‑Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070People’s Republic of China Research Center for Materials Genome Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ammonia detection possesses great potential in atmosphere environmental protection,agriculture,industry,and rapid medical ***,it still remains a great challenge to balance the sensitivity,selectivity,working temperature,and response/recovery *** this work,Berlin green(BG)framework is demonstrated as a highly promising sensing material for ammonia detection by both density functional theory simulation and experimental gas sensing *** in BG framework offers abundant active sites for ammonia absorption,and the absorbed ammonia transfers sufficient electron to BG,arousing remarkable enhancement of *** BG framework shows remarkable response to ammonia at 50–110°C with the highest response at 80°C,which is jointly influenced by ammonia’s absorption onto BG surface and insertion into BG *** sensing performance of BG can hardly be achieved at room temperature due to its high *** of conductive Ti3CN MXene overcomes the high resistance of pure BG framework,and the simply prepared BG/Ti3CN mixture shows high selectivity to ammonia at room temperature with satisfying response/recovery speed.

关键词： Berlin green framework Gas sensor Ammonia Room temperature High selectivity

Preface to Special Issue for 2nd Chinese Symposium on Photocatalytic Materials (CSPM2)

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Chinese Journal of Catalysis 2021年第1期42卷 1-2页

作者： Jiaguo Yu Zhaosheng Li Shifu Chen State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyChina College of Engineering and Applied Sciences Nanjing UniversityChina Key Laboratory of Clean Energy and Green Circulation Huaibei Normal UniversityChina

With the ever-increasing consumption of fossil fuels and the increment in environmental pollution problems,developing sustainable and renewable energy sources and environmentally friendly purification methods has become an appeal investigation all over the *** can provide promising solutions to these issues,by utilizing solar light to reduce CO2 into hydrocarbon fuels,to split water into hydrogen and to mineralize organic pollutants into inorganic ***,a huge obstacle to the application of this technology is its low photocatalytic *** improvement on the performance of photocatalytic materials is urgently ***,this investigation topic was within the scope of The 2nd Chinese Symposium on Photocatalytic Materials(CSPM2)held at Nanjing Jinling Riverside Hotel,Nanjing,China on November 8-11,*** conference was organized by Nanjing University,Huaibei Normal University,Changsha University,Fuzhou University and Wuhan universityof technology,and supported by National Natural Science Foundation of China(NSFC),Nanjing University,Huaibei Normal University,Changsha University,Wuhan University of technology,Beijing Perfectlight and *** are more than 420 experts and students attending this symposium,and 12 plenary lectures,17 keynote lectures,9 invited lectures,12 oral lectures and 115 posters ***,18 excellent posters were selected.

关键词： utilizing Nanjing increment

Crystalline porous materials:from zeolites to metal-organic frameworks(MOFs)

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Frontiers of Chemical Science and Engineering 2020年第2期14卷 123-126页

作者： Zaiku Xie Bao-Lian Su State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Research Institute of Petrochemical TechnologyShanghai 201208China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074China

As a class of important crystalline porous materials,zeolites which were first found in 1756 have now been widely used in chemical industries for catalysis,adsorption and separation.35232 patents with the title including Hzeolite*n are documented by Derwent Innovations Index on January 2,2020[1].Despite of spread applications of zeolites and related-materials in industry,fundamental research of zeolites and their applications are still desired in both academia and industry,as shown in Fig.1.

关键词： porous zeolites zeolite

Phase Boundary Mapping for High Thermoelectric Performance Β-Zn4sb3 in Zn-in-Sb Ternary System

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SSRN 2023年

作者： Zhong, Shenlong Liu, Keke Duan, Yusong Zhang, Qingjie Wu, Jinsong Su, Xianli Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

Zn4Sb3 with complex structure shows excellent thermoelectric performance in the low temperature region. Herein, three batches of In doped Zn4Sb3 were synthesized and the influence of In dopant and Zn content on the thermoelectric properties of Zn4Sb3 was systematically investigated by using a phase boundary method. The isothermal ternary phase diagram of Zn-In-Sb is explored at 623 K. The solubility limit of In in the single phase region with β-Zn4Sb3 structure is strongly related to the ratio between Zn+In and Sb. In atoms preferentially occupy C interstitial of 48f site in the crystallographic Wyckoff position and Zn deficiency increases the concentration of Zn vacancies on this site, enhancing the solubility limit of In in the system. The modification of structure via doping with In hinders the movement and diffusion of Zn interstitial in Zn4Sb3, accompanying with the disappearance of the low temperature phase transitions from α' to α phase and from α to β phase. The regulation of Zn and In contents in single phase region with β-Zn4Sb3 structure effectively optimizes the thermoelectric performance. A maximum ZT value of 1.43 is attained at 673 K for (Zn0.96In0.04)4.15Sb3 compound, which demonstrate a 47 % improvement in comparison with that of Zn4.15Sb3 compound. This work provides a new avenue to further improve thermoelectric properties of Zn4Sb3 compounds. © 2023, The Authors. All rights reserved.

关键词： Solubility

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

Experimental Probing of the Effect of Nafion Poisoning at Different Pt Loadings in a Pemfc

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SSRN 2022年

作者： Zhou, Fen Zhang, Hui Guan, Shumeng Li, Guangfu Xia, Lei Pan, Mu Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan430070 China

The charge-transfer resistance ( R ct ) in electrochemical impedance spectroscopy (EIS) was applied as an activity indicator to study the suppression of a rotating disk electrode (RDE) and membrane electrode assembly (MEA) by Nafion with different Pt loadings. Use of the R ct avoids uncertainty in activity characterization;such uncertainty is caused by mass transfer in highly loaded catalyst agglomerates. It was found that Nafion had a stronger poisoning effect at lower Pt loadings. The simultaneous reduction in the working voltage further aggravates the poisoning, especially under low-Pt conditions. After poisoning, the normalized R ct at 20 µg/cm 2 increased from 8 times at 0.9 V to 21 times at 0.82 V. When the Nafion adsorption coverage on the surface of Pt remained constant, the suppressed activity increased as the Pt loading decreased. Therefore, it is critical to consider Nafion poisoning when constructing MEAs with low platinum and take appropriate strategies to alleviate poisoning and achieve high-performance output. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

Modulating the Valence of in on the Thermoelectric Properties of Pb0.99in0.01te1-Xsx Compounds

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SSRN 2023年

作者： Hu, Qin Liu, Keke Wu, Jinsong Su, Xianli Zhang, Qingjie Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

In dopant demonstrates a distinct role in PbTe and PbS compounds though they possess the same crystal structure. Therefore, to unravel how the thermoelectric performance evolves in the In-doped PbTe1-xSx solid solution is crucial. Herein, a series of Pb0.99In0.01Te1-xSx samples were synthesized by conventional melting methods. It is found that doping In in PbTe introduces a shallow level impurity state In3+ and a deep level associated with the In+ state simultaneously. Alloying PbS in Pb0.99In0.01Te1-xSx compounds modulates the valence of In dopant, increasing the relative ratio of In3+ content due to the stronger oxidation capacity of S in comparison with that of Te. This augments the room temperature carrier concentration from 3.03×1018 cm-3 for Pb0.99In0.01Te compound to 6.51×1018 cm-3 for Pb0.99In0.01Te0.88S0.12 compound. Therefore, an improved power factor of 17.4 μW cm−1 K−2 for Pb0.99In0.01Te0.91S0.09 sample is obtained at room temperature. Additionally, alloying PbS in Pb0.99In0.01Te1-xSx compounds enhances the point defect phonon scattering and lowers the lattice thermal conductivity from 1.99 W m-1 K-1 for Pb0.99In0.01Te compound to 1.09 W m-1 K-1 for Pb0.99In0.01Te0.88S0.12 compound at room temperature. As a consequence, a maximum ZT value of 1.12 at 723 K is attained for Pb0.99In0.01Te0.95S0.05 compound, which is improved by 19% in comparison with that of Pb0.99In0.01Te compound. This work provides a new path for modulating the doping behavior of cation site dopant via alloying on anion site to further improve the ZT value in thermoelectric materials. © 2023, The Authors. All rights reserved.

关键词： Alloying

Rationally Designing Anti-Poisoning Polymer Electrolyte by Electronegativity Modulation: Towards Efficient Ammonia-Cracked Hydrogen Fuel Cells

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SSRN 2023年

作者： Shuai, Jiaqi Zhao, Shengqiu Liao, Yucong Wu, Fanglin Wang, Rui Wang, Letian Shen, Chunhui Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Polymer Materials & Engineering School of Material Science & Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Fuel Cells Wuhan University of Technology Wuhan430070 China

Ammonia as a hydrogen enrichment medium has tremendous advantages over pure hydrogen in terms of transportation and utilization. The high-efficiency anti-ammonia-poisoning membrane electrode assembly (MEA) is pivotal for the practical implementation of ammonia-resistant proton exchange membrane fuel cells (PEMFCs). As for the polymer electrolyte, which is an integral part of the proton exchange membrane (PEM) and catalytic layer (CL) binder in the MEA, structural design is an effective way to improve its resistance to ammonia poisoning. Herein, an in-depth study of sulfonimides with superacidic structures reveals that the proton dissociation energies can be altered by tuning the terminal groups with different electronegativity and enhancing the competitive adsorption of protons on Pt. Four perfluorinated backbone sulfonimides (PFSI-x (x= TSM, MSA, ESA, and iPSA)) with distinct charge delocalization were fabricated by grafting different electronegative monomers onto the perfluorosulfonyl fluoride (PFSF). The results show that PFSI-TSM possesses a higher electrostatic potential (2.69 eV) and the lowest activation energy (12.07 KJ/mol). Meanwhile, the performance of the PFSI-TSM PEM fuel cell is 40.6% higher than the PFSA at 80°C, 100% relative humidity (RH) under 100 ppm NH3, with a maximum power density of 635.2 mW/cm2. The underlying reason for enhanced performance is in virtue of the more electronegative end groups render the superacid electrolyte with higher acidity and pKa values, which change the direction of the acid dissociation equilibrium reaction on the Pt surface, enhance the competitive adsorption of protons in the MEA and reduces the probability of ammonia adsorption poisoning. The insights in charge delocalization and proton ionization construct the structure-property relationship which would provide the guidance for a rational design of PEM for ammonia-resistant fuel cells. © 2023, The Authors. All rights reserved.

关键词： Electronegativity