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Colloidal(Gd0.98Nd0.02)2O3 nanothermometers operating in a cell culture medium within the first and second biological windows

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Journal of Rare Earths 2020年第5期38卷 483-491页

作者： M.L.Debasu H.Oliveira J.Rocha L.D.Carlos department of Physics CICECO-Aveiro Institute of MaterilsUniversidade de Aveiro3810-193AveiroPortugal department of Chemistry CICECO-Aveiro Institute of MaterialsUniversidade de Aveiro3810-193AveiroPortugal department of Biology CESAMLaboratory of Biotechnology and CytomicsUniversidade de Aveiro3810-193AveiroPortugal

Non-contact,self-referenced and near-infrared luminescent nanothermometers have been recognized as emerging tools in the fields of nanomedicine and nanotechnology due to their great capability of precise temperature readout at the nanoscale and real-time deep-tissue ***,the development of multifunctional and biocompatible luminescent nanothermometers operating within the optically transparent biological windows with high thermal sensitivity(>2.0%/K)remains ***,we present(Gd0.98Nd0.02)2O3 nanothermometers operated effectively within the first and second biological windows upon continuous-wave laser diode excitation at 808 *** thermometric parameters are defined by the relative changes in the emission intensities originating from the two Stark components of the 4 F3/2 level(R2 and R1)to the 4 I9/2(900-1000 nm),4 I11/2(1035-1155 nm)and 4 I13/2(1300-1450 nm)*** thermo metric parameters are evaluated for colloidal samples in a cell culture medium and powder samples,and the highest thermal sensitivity(2.18%/K at 298 K)is attained for the former in the first biological window(both the excitation and emission in the 800-965 nm range).The repeatability and temperature uncertainty are 99%and 1.2 K,*** nanothermometers are biocompatible with human MNT-1 melanoma and HaCaT cells for 24 h of exposure and nanoparticle concentration up to 0.400 mg/mL,showing their potential for applications in nanomedicine,e.g.,intracellular imaging and temperature mapping.

关键词： Gd2O3 Nd3^+-doped nanoparticles Luminescent nanothermometry Thermal sensitivity Cytotoxicity of nanoparticles Rare earths

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Tailoring interface of lead-halide perovskite solar cells

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Nano Research 2017年第5期10卷 1471-1497页

作者： Peimei Da Gengfeng Zheng Laboratory of Advanced materials Department of Chemistry Collaborative Innovation Center of Chemistry for Energy Materials Fudan University Shanghai 200438 China

Lead-halide perovskite solar cells （PSCs） have attracted tremendous attention during the past few years owing to their extraordinary electronic and photonic properties. To improve the performances of PSCs, many researchers have focused on the compositional engineering, solvent engineering, and film fabrication methodologies. Interfacial engineering of PSCs has become a burgeoning field in which researchers aim to deeply understand the mechanisms of cells and thereby increase the efficiency and stability of PSCs. This review focuses on the interface tailoring of lead-halide PSCs, including the modification of each layer of the cell structure （i.e., perovskite absorber, electron-transport layers, and hole- transport layers） and the interfacial materials that can be introduced into the PSCs.

关键词： perovskite solar cell interface engineering

Monolayer MoSi_(2)_N(4-x) as promising electrocatalyst for hydrogen evolution reaction: A DFT prediction

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Journal of materials Science & Technology 2022年第4期99卷 215-222页

作者： Wangwang Qian Zhe Chen Jinfeng Zhang Lichang Yin Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Center of Artificial Photosynthesis for solar Fuels School of ScienceWestlake UniversityHangzhou 310024China department of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China

The density functional theory(DFT)calculations have been performed to investigate the catalytic properties of monolayer MoSi_(2)N_(4) for hydrogen evolution reaction(HER).The DFT results show that similar to the majority of other two-dimensional(2D)materials,the pristine MoSi_(2)N_(4) is inert for HER due to its weak affinity toward hydrogen,while monolayer MoSi_(2)N_(4-x)(x=0–0.25)exhibits the highly desirable HER catalytic activities by introducing surface nitrogen vacancy(NV).The predicted HER overpotential(0–60 mV)of monolayer MoSi_(2)N_(4-x) is lower than that(90 mV)of noble metal Pt,when the concentration of surface NV is lower than 5.6%.Electronic structure calculations show that the spin-polarized states appear around the Fermi level after introducing surface NV,thus making the surface NV on 2D MoSi_(2)N_(4) a quite suitable site for ***,the HER activity of MoSi_(2)N_(4-x) is highly dependent on the surface NV concentration,which can be further related to the center of Si-3p *** results demonstrate that the newly discovered 2D MoSi_(2)N_(4) can be served as a promising electrocatalyst for HER via appropriate defect engineering.

关键词： Hydrogen evolution reaction Electrocatalyst 2D material MoSi_(2)N_(4) Surface nitrogen vacancy

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Prediction of high thermoelectric performance in the lowdimensional metal halide Cs_(3)Cu_(2)I_(5)

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npj Computational materials 2021年第1期7卷 476-481页

作者： Young-Kwang Jung In Taek Han Yong Churl Kim Aron Walsh department of materials Science and Engineering Yonsei UniversitySeoulSouth Korea Samsung Advanced Institute of Technology(SAIT) Samsung Electronics Materials Research ComplexYoungtongSuwonSouth Korea department of materials Imperial College LondonLondonUK

Metal halides have emerged as a new generation of semiconductors with applications ranging from solar cells to chemical *** assess the thermoelectric potential of Cs_(3)Cu_(2)I_(5),which has a crystal structure formed of zero-dimensional[Cu_(2)I_(5)]3−anionic clusters that are separated by Cs+counter *** find the compound exhibits the characteristics of a phonon-glass electroncrystal with a large imbalance in the conduction of heat and electrons predicted from first-principles transport *** anharmonic phonon–phonon scattering results in short-lived acoustic vibrations and an ultra-low lattice thermal conductivity(10 cm^(2)V^(−1)s^(−1)).For an n-type crystal at 600 K,a thermoelectric figure-of-merit ZT of 2.6 is found to be accessible,which for a cold source of 300 K corresponds to a thermodynamic heat-to-electricity conversion efficiency of 15%.

关键词： theory phonon crystal

Effects of Au nanoparticle addition to hole transfer layer in organic solar cells based on copper naphthalocyanine and fullerene

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Progress in Natural Science:materials International 2014年第3期24卷 179-183页

作者： Akihiko Nagata Takeo Oku Tsuyoshi Akiyama Atsushi Suzuki department of materials Science The University of Shiga Prefecture

Organic solar cells based on copper naphthalocyanine(CuNc) and fullerene(C60) were fabricated, and their photovoltaic properties were investigated. C60 and CuNc were used as n-type and p-type semiconductors, respectively. In addition, the effect of Au nanoparticle addition on a hole transfer layer was investigated, and the power conversion efficiency of the devices was improved after blending the Au nanoparticles into the hole transport layer. Nanostructures of Au nanoparticles were investigated by transmission electron microscopy and X-ray diffraction. Energy levels of molecules were calculated by molecular orbital calculations, and the nanostructure and electronic properties were discussed.& 2014 Chinese materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： solar cell Copper naphthalocyanine Fullerene Au nanoparticle

S-scheme heterojunction photocatalysts for CO_(2) conversion: Design, characterization and categories

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Energy Reviews 2023年第4期2卷 63-80页

作者： Aiyun Meng Bicheng Zhu Yucun Zhong Shuang Zhou Peigang Han Yaorong Su College of New materials and New Energies Shenzhen Technology UniversityShenzhenPR China'Laboratory of Solar FuelFaculty of Materials Science and ChemistryChina University of Geosciences68 Jincheng StreetWuhan430078PR China

Photocatalytic CO_(2) conversion into valuable hydrocarbon fuels via solar light is a promising strategy to simul-taneously address energy shortage and environmental ***,the photocatalytic CO_(2) reduction performance is too poor to be practically utilized due to the rapid recombination of photogenerated charge *** step-scheme(S-scheme)heterojunction photocatalysts can facilitate the charge separation and maximize the redox ability,thus remarkably enhancing the photocatalytic CO_(2) reduction *** review summarizes the progress of S-scheme heterojunction photocatalysts applied in the photocatalytic CO_(2) reduction ***,we introduce the fundamental design principles and characterization *** direct and indirect techniques to confirm the S-scheme charge transfer mechanism are ***,we divide S-scheme composite photocatalyst into the following categories depending on their compositions:g-C_(3)N_(4)-based,metal-chalcogenide-based,TiO_(2)-based,bismuth-based,other metal oxide-based and other semiconductor-based S-scheme *** synergistic effect of the S-scheme charge transfer pathway as well as the unique intrinsic properties of semiconductor materials on the photocatalytic CO_(2) reduction performance is discussed in ***,concluding perspectives on the challenges and opportunities for the further exploration of highly efficient S-scheme photocatalysts in photocatalytic CO_(2) conversion are presented.

关键词： Step-scheme heterojunction Photocatalyst CO_(2)reduction Characterization techniques

Real Time,in situ Observation of the Photocatalytic Destruction of Saccharomyces cerevisiae Cells by Palladium-modified Nitrogen-doped Titanium Oxide Thin Film

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Journal of materials Science & Technology 2015年第1期31卷 48-54页

作者： Jingtao Zhang Qi Li Ronghui Li Jian Ku Shang Environment Functional materials Division Shenyang National Laboratory for Materials ScienceInstitute of Metal Research Chinese Academy of Sciences department of materials Science and Engineering University of Illinois at Urbana-Champaign

Palladium-modified nitrogen-doped titanium oxide(TiON/PdO) thin film was synthesized by the ion-beamassisted deposition technique,which enabled a heavy nitrogen doping and the subsequent light absorption extension to700 nm for a better usage of the solar *** on TiON/PdO thin film and a phase contrast microscope,a micro-reaction chamber was developed,which allowed the simultaneous optical excitation of the photocatalytic thin film and the phase contrast image observation of cells in *** real time,in situ observation of the photocatalytic destruction of Saccharomyces cerevisiae(***),an essential eukaryotic unicellular model of living cells,was conducted with this new observation technique,which demonstrated clearly that the photocatalytic destruction effect was much stronger than the photodamage effect caused by the visible light irradiation alone in the disinfection process.

关键词： Ion-beam assisted deposition(IBAD) TiON/PdO thin f

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Amphipathicity mediated endocytosis of mesoporous silica nanoparticles with tunable frameworks

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Nano Research 2024年第9期17卷 8350-8359页

作者： Runfeng Lin Tiancong Zhao Liang Chen Minchao Liu Hongyue Yu Ruicong Wang Minjia Yuan Xiaomin Li Dongyuan Zhao department of Chemistry State Key Laboratory of Molecular Engineering of PolymersiChemShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China Shanghai Qiran biotechnology Co. Ltd.Shanghai 201702China

Due to the amphiphilic nature of phospholipids in the cell membrane,the amphipathicity of the nanomedicine plays a crucial role in the ***,limited biological characterization methods restrict the study of the state of nanoparticles with different amphiphilicities on cell *** understanding of interaction of amphiphilic particle with cell membrane is still ***,by combining the dissipative particle dynamics(DPD)with the framework construction of mesoporous silica nanoparticles(MSNs),we demonstrate the enhanced endocytosis induced by the *** results confirm that the presence of hydrophobic groups on the surface of nanoparticles can disturb the integrity of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC)membrane and induce activation of phospholipids to a higher energy level,thereby facilitating the wrapping of *** validate the simulation findings,uniform MSNs with hydrophilic pure silica framework and two types of amphiphilic MSNs with varying hydrophilic organic groups in the framework are rationally synthesized by using different silane *** obtained three kinds of MSNs show similar diameter(~100 nm)and mesopores(~2 nm),but distinct hydrophobicity/hydrophilicity *** phenyl-bridged MSN with a carbon content of 27.1%exhibits enhanced cellular uptake,consistent with the theoretical simulation *** work sheds light on how the surface amphipathicity influences endocytosis through the interaction with cell membrane.

关键词： mesoporous silica nanoparticles mesoporous organosilica endocytosis cell membrane amphipathicity

Bio-derived crystalline silk nanosheets for versatile macroscopic assemblies

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Nano Research 2022年第6期15卷 5538-5544页

作者： Baochang Cheng Zhouyue Lei Peiyi Wu State Key Laboratory for Modification of Chemical Fibers and Polymer materials College of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low-Dimension MaterialsDonghua UniversityShanghai 201620China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200433China

Silk fibroin with sophisticated hierarchical architectures from nano to macro scale shows excellent mechanical properties,good biocompatibility,and outstanding *** particular,the crystalline region in silk fibroin contributes high strength and ***,it is difficult to obtain the crystalline silk nanofibrils or nanosheets through top-down *** existing silk-derived components are mainly amorphous and sacrifice the delicate structure of the pristine ***,we report a gentle method to extract the crystalline silk nanosheet(SNS)from the degummed silk *** crystalline SNS has seven strands ofβ-sheet nanocrystal layer and shows a thickness of 2.75 *** can assemble into a membrane via a vacuum filtration process and shows high transparency,excellent thermal stability,outstanding cytocompatibility,and efficient dye ***,without external stimuli,the crystalline SNS is capable of reversibly self-assembling to well-organized *** crystalline SNS is not only a new member of silk fibroin derivatives,but also a promising assemblable unit for versatile *** anticipate this work will provide a new insight into the construction and applications of diverse two-dimensional(2D)functional silk materials.

关键词： silk fibroin hierarchical structure top-down exfoliation crystalline nanosheet reversible self-assembly