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Supramolecular host–guest self-assembled monolayers as a new generation of nanoscale ruler under the reform of SI units

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Nano Research 2025年第2期18卷 455-463页

作者： Jianqiao Li Yufei Zhang Yushu Shi Ke Deng Qingdao Zeng Center for Advanced Measurement Science National Institute of Metrology(NIM)Beijing 100029China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Shenzhen Institute Technology Innovation National Institute of Metrology(NIM)Shenzhen 518107China

Si lattice-based linewidth,as the most used calibrator in the semiconductor industry,failed to meet the nanoscale demands of critical dimensions(CD).In 2018,the Si(220)lattice spacing was recommended as a secondary realization of the meter definition,however,Si lattices as nanoscale rulers can only be used in ultra-high vacuum(UHV)*** the first time,we designed two-dimensional(2D)supramolecular self-assembly monolayers(SAMs)as a new generation of nanoscale rulers using scanning tunneling microscopy(STM)technology in atmospheric *** SAMs nanoscale rulers were selected among seven types of SAMs based on their self-assembly behaviors and thermodynamic *** of these SAMs nanoscale rulers was used to calibrate the sTM images through lattice perspective transformation method,and directly determine the lattice length along the nanoscale rulers'lattice direction without calibration,proving the feasibility of SAMs nanoscale rulers in *** construction of SAMs nanoscale rulers was straightforward and manageable in the atmosphere,significantly lowering the complexity of producing nano precise measurement *** the ideal SAMs for use as nanoscale rulers holds immense potential to significantly reduce the cost of calibration in chip industries.

关键词： supramolecular self-assembly monolayers nanoscale rulers calibration nanometrology scanning tunneling microscopy

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A self-supported P-TiO2（B）/Ni2P hybrid achieves efficient sunlight-driven seawater splitting

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Science China Chemistry 2025年第5期68卷 1888-1896页

作者： Zhijie Cheng Xianghui Yu Shuang Cao Chunhu Li Qi Wang Lingyu Piao CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education) College of Chemistry & Chemical EngineeringOcean University of China College of Chemistry and Chemical Engineering Institute for Sustainable Energy and ResourcesQingdao University Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

The low hydrogen（H2） production efficiency and catalyst deactivation for seawater splitting are the significant challenges that should be addressed to achieve practical *** study develops a highly efficient seawater splitting system and extends the utilization of the solar spectrum to the infrared region using a phosphorus-doped Ti O2（B）-based photocatalyst decorated Ni2P on nickel foam(P-TiO2（B）/Ni2P/NF) ***2P serves not only as a co-catalyst for H2production but also as a photothermal conversion layer,harnessing the concentrated heat from solar radiation to vaporize *** far significance is it shifts the H2production from the traditional three-phase system involving solid,liquid,and gas to a more efficient two-phase system involving solids and gases,which effectively reduces the barrier to the thermodynamic reactions and accelerates the processes of transferring mass,resulting in improved efficiency and stability of the *** efficient light absorption,super hydrophilic surfaces,and excellent mechanical stability,this system achieves a H2production rate of 4.22μmol cm-2h-1under AM 1.5G light irradiation without using any noble metals or sacrificial *** rate is line with its performance in pure water and exceeds that of similar reported *** importantly,after more than 300 h of irradiation,the system still demonstrated high H2production activity,indicating the potential for practical *** work provides a valuable strategy to improve both the efficiency and stability of the photothermal catalytic seawater splitting under natural sunlight conditions.

关键词： seawater splitting photothermal catalysis titanium dioxide nickel phosphide

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Nanoparticles for the treatment of spinal cord injury

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Neural Regeneration Research 2025年第6期20卷 1665-1680页

作者： Qiwei Yang Di Lu Jiuping Wu Fuming Liang Huayi Wang Junjie Yang Ganggang Zhang Chen Wang Yanlian Yang Ling Zhu Xinzhi Sun Department of Orthopedic Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Neurosurgery The First Affiliated Hospital of Chongqing Medical UniversityChongqingChina

Spinal cord injuries lead to significant loss of motor, sensory, and autonomic functions, presenting major challenges in neural regeneration. Achieving effective therapeutic concentrations at injury sites has been a slow process, partly due to the difficulty of delivering drugs effectively. Nanoparticles, with their targeted delivery capabilities, biocompatibility, and enhanced bioavailability over conventional drugs, are garnering attention for spinal cord injury treatment. This review explores the current mechanisms and shortcomings of existing treatments, highlighting the benefits and progress of nanoparticle-based approaches. We detail nanoparticle delivery methods for spinal cord injury, including local and intravenous injections, oral delivery, and biomaterial-assisted implantation, alongside strategies such as drug loading and surface modification. The discussion extends to how nanoparticles aid in reducing oxidative stress, dampening inflammation, fostering neural regeneration, and promoting angiogenesis. We summarize the use of various types of nanoparticles for treating spinal cord injuries, including metallic, polymeric, protein-based, inorganic non-metallic, and lipid nanoparticles. We also discuss the challenges faced, such as biosafety, effectiveness in humans, precise dosage control, standardization of production and characterization, immune responses, and targeted delivery in vivo. Additionally, we explore future directions, such as improving biosafety, standardizing manufacturing and characterization processes, and advancing human trials. Nanoparticles have shown considerable progress in targeted delivery and enhancing treatment efficacy for spinal cord injuries, presenting significant potential for clinical use and drug development.

关键词： antioxidants axon regeneration biocompatible materials drug carriers nanoparticles nerve regeneration neuroinflammatory diseases neuroprotection spinal cord injury stem cells

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Boosting piezo-catalytic H2 production on g-C3N4 via carbon-ring doping to shorten in-plane charge transfer distance

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Ceramics International 2025年

作者： Nie, Junying Yue, Shuai Li, Bing Guo, Jianzhong Wu, Chunzheng College of Chemistry and Materials Engineering Zhejiang A&F University Hangzhou311300 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing100190 China

Recent advances in piezo-catalysis for H2 production from water under ambient conditions have garnered considerable attention. Traditional micro-sized g-C3N4 sheets with in-plane polarization face challenges for piezoelectric catalysis, due to its long charge transfer distance and limited reaction sites confined to the edges. In this study, carbon-ring motifs were incorporated into the g-C3N4 structure to disrupt the planar charge transfer path and shorten the charge transfer distance while largely preserving piezoelectric polarization. This modification resulted in a twofold increase in the H2 production rate, from 726.9 to 1473.2 μmol/g/h. Using piezoelectric force microscopy, electrochemical tests, and piezoelectric deposition tests, we found that carbon doping slightly reduced the piezoelectric response but relocated the reaction sites from the edges to the surface, significantly shortening the lateral charge transfer distance and enhancing charge separation efficiency. This research provides a straightforward and effective strategy to improve the piezo-catalytic performance of two-dimensional g-C3N4 materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Carbon nitride

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Green anti-solvent modulation of the growth of binary FAXMA1-X tin-based perovskite and their photovoltaic properties

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The European Physical Journal B 2025年第1期98卷 1-11页

作者： Deng, Longtao He, Linfeng Chen, Xinyao Cheng, Jin Zhang, Chunqian Li, Zhenjun Li, Junming Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China Beijing Key Laboratory for Sensor School of Science Beijing Information Science and Technology University Beijing China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Key Laboratory of Nanophotonic Materials and Devices (Preparatory) National Center for Nanoscience and Technology Beijing China

Tin-based perovskite represents a highly promising alternative to lead-based perovskite, offering a number of significant advantages. These include non-toxicity, high absorbance, and excellent photovoltaic properties. The use of the toxic anti-solvent chlorobenzene (CBZ) in the preparation of tin-based perovskite thin films has the dual disadvantage of increasing the environmental hazards and the cost of subsequent treatment. The use of acetic acid (HAc) as a green anti-solvent has been demonstrated to effectively regulate the crystallization process of tin-based perovskite FASnI3, resulting in the preparation of perovskite films of superior quality. To further enhance the performance of tin-based perovskite, Zhao et al., organic cation mixing was used to add MAI to the FASnI3 system and optimize the ratio, resulting in an optimal ratio of FA (0.75) MA (0.25) (FA = NH2CH = NH2+, MA = CH3NH3+) (Zhao et al. Adv Sci 4(11):1700204, 2024). In this study, we choose the crystallization process during the preparation of binary FA0.75MA0.25SnI3 perovskite using a green anti-solvent HAc. The findings demonstrated that HAc was capable of influencing the crystallization of binary tin-based perovskite, facilitating the formation of perovskite films with minimal pinholes and enhanced uniformity and crystallinity. Additionally, the resulting perovskite exhibits a band gap of 1.35 eV, which is in close alignment with the predicted ideal band gap as postulated by Schottky's theory. Furthermore, it displays enhanced hydrophobic properties. In the binary perovskite photovoltaic device prepared using the anti-solvent HAc, the maximum device efficiency reached 3.62%. The findings of this study will contribute to the understanding of the crystallization process of diverse perovskite materials in the presence of a green anti-solvent.

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High yield growth of centimeter-sized black phosphorus single crystal thin flakes through bidirectional vapor transport

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Science China Materials 2025年第1期68卷 217-225页

作者： Siyuan Wang Cheng Chen Yaning Liang Xingang Hou Xiangyi Wang Zhuo Dong Junyong Wang Chao Jiang Kai Zhang Key Laboratory of Semiconductor Display Materials and Chips&i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Nano Science and Technology University of Science and Technology of ChinaSuzhou 215123China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing and Department of Applied PhysicsNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Black phosphorus(BP)has been regarded as a promising two-dimensional semiconductor due to its excellent properties including high carrier mobility and widely tunable direct *** extensive interest as well as research progress,the preparation of large-size and high-quality BP single crystal in high throughput still remains ***,a facile growth of centimeter-sized BP single crystal flakes with dozens of throughput per batch is achieved by using bidirectional vapor transport(BVT)*** crystal quality is confirmed by structural and spectrum characterizations,with an X-ray diffraction rocking curve peak half-height width of only 0.02°.The as-grown BP single crystal flake with smooth cleavage plane can be easily exfoliated into large scale ***-effect transistors fabricated based on the BP by such approach show excellent performance including reliable carrier mobility up to 1150 cm^(2) V^(−1) s^(−1) and on/off current ratio of~10^(6)at 15 *** approach is also applicable to various doped-BP,such as As-BP,Se-BP,Te-BP,*** ability to grow centimeter-sized BP single crystal flakes in high yield will accelerate the research and applications of BP-based electronics and optoelectronics.

关键词： black phosphorus single crystal chemical vapor transport two-dimensional materials field-effect transistors

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Signature of superconductivity in pressurized La4Ni3O10-x single crystals grown at ambient pressure

arXiv

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arXiv 2025年

作者： Li, Feiyu Hao, Yinqiao Guo, Ning Zhang, Jian Zheng, Qiang Liu, Guangtao Zhang, Junjie Key Laboratory of Material Simulation Methods and Software Ministry of Education College of Physics Jilin University Changchun130012 China State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University Shandong Jinan250100 China State Key Laboratory of Superhard Materials International Center of Computational Method & Software College of Physics Jilin University Changchun130012 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China

Nickelates have attracted enormous attention since the discovery of high-temperature superconductivity in La3Ni2O7 under high pressure. However, whether superconducting nickelate single crystals can be prepared at ambient pressure remains elusive. Here we report signature of superconductivity in pressurized La4Ni3O10-x single crystals grown from potassium carbonate flux at ambient pressure. Single crystal X-ray diffraction and scanning transmission electron microscopy investigations revealed high-quality single crystals with perfect stacking of trilayers. Resistivity measurements indicate that the metal-to-metal transition observed at ambient pressure was suppressed under high pressure, and a sharp drop occurred at ~30 K at 77.9 GPa, consistent with superconductivity in pressurized La4Ni3O10 single crystals grown by the floating zone method at an oxygen pressure of >18 bar. Our results not only provide an important path to prepare high-quality nickelate single crystals but also support superconductivity in nickelates under high pressure, promoting more systematic and in-depth research in this compelling field. Copyright © 2025, The Authors. All rights reserved.

关键词： Single crystals

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Damage of bilayer structure in La3Ni2O7-d induced by high pO2 annealing

arXiv

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arXiv 2025年

作者： Zhang, Yulin Pei, Cuiying Guo, Ning Fan, Longlong Zhang, Mingxin Wang, Lingzhen Zhang, Gongting Li, Feiyu Wang, Yunong Ma, Chao Cheng, Wenyong Wang, Shanpeng Zheng, Qiang Qi, Yanpeng Zhang, Junjie Institute of Crystal Materials State Key Laboratory of Crystal Materials Shandong University Jinan250100 China School of Physical Science and Technology ShanghaiTech Laboratory for Topological Physics Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Shanghai201210 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

The discovery of superconductivity with onset temperature of ~80 K in pressurized bilayer Ruddlesden-Popper La3Ni2O7-d has attracted much attention. Despite intense research, determination of the exact oxygen content and understanding of the relationship between superconductivity and oxygen content remain a big challenge. Here, we report a systematical study on the structure and physical properties of La3Ni2O7-d polycrystalline powders which were prepared using sol-gel method at ambient pressure and then annealed under various oxygen pressure. We found that high pO2 annealing with slow cooling results in a new phase, which can be modeled using the hybrid single-layer-trilayer La3Ni2O7 or the tetragonal bilayer La3Ni2O7. Scanning transmission electron microscopy (STEM) measurements revealed significant single layers and trilayers after high oxygen pressure annealing, evidencing damage of the bilayer structure. The superconducting transition under high pressure became weak for high pO2 annealed samples, which is consistent with the damage of the bilayer structure. Our results reveal that the bilayer structure is fragile and post-annealing under near atmosphere pressure of oxygen is suitable to maintain bilayer structure and increase oxygen content at the same time. Copyright © 2025, The Authors. All rights reserved.

关键词： Sol-gel process

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Tcn and Tcn@C70 Endohedral Metalofullerenes: ab initio Spin-density-functional Calculations

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Li-jing Zeng Ke Deng CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology (NCNST) Beijing 100190 China

Ab initio spin-density-functional calculations have been performed to study the equilibrium structural, electronic, and magnetic properties of Tcn and Tcn@C70 endohedral metalofullerenes. Our results indicate that C70 can encapsulate Tcn clusters with up to n=9 atoms. Except n=2, the formation of Tcn@C70 endohedral metalofullerenes is predicted to be exothermic when n≤5, while the encapsulation process becomes increasingly endothermic beyond n=5. When encapsulating into the C70 cage, the geometries as well as electronic structures of the Tc cluster undergo comparative changes. Especially, compared to the isolated Tcn clusters, the total magnetic moments of Tcn@C70 reduce significantly. The analyses of the orbital population, Hirshfeld population and density of states show that electrons transfer from the Tc cluster to the carbon cage through the Tc–C efficient hybridization, which is responsible for such reduction of the whole magnetism.

关键词： Density functional theory Endohedral metalofullerenes Tcn@C70 Vienna ab initio simulation package

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Minimizing the effect of near-distance dielectric sensitivity on retrieving average aspect ratio of gold nanorod by optical extinction spectroscopy:in the case of CTAB adsorption

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Chinese Science Bulletin 2014年第16期59卷 1822-1831页

作者： Zhijian Hu Yinglu Ji Shuai Hou Xiaochun Wu CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology

The aspect ratio(AR)is one of the most intriguing parameters of gold nanorods(GNRs),which plays an important role in determining localized surface plasmon(LSPR)*** of conventional imaging techniques,the optical extinction spectroscopy(OES)method has been developed for allowing fast statistically measuring the average AR under static *** this work,combining with the previous achievements in spectroscopic technique,we further analyze the effects of gold dielectric function and near distance dielectric *** former may reflect possible dielectric loss of real Au samples from ideal single *** latter reflects the cetyltrimethylammonium bromide(CTAB)adsorption on the surface of GNR induces different LSPR shifts below and above critical micelle concentration(CMC).However,their effect on the determination of AR has not been evaluated in OES *** average AR measurements as a function of absorbance of CTAB-GNRs and LSPR maximum below the CMC were *** results indicate that after considering these factors,the mean ARs obtained from spectroscopic techniques are closer to those obtained from imaging techniques.

关键词： CTAB 消光光谱吸附作用平均值纵横比纳米棒灵敏度近距离

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