Two-dimensional (2D) lead halide perovskite (LHP) nanoplatelets (NPLs) have recently emerged as promising materials for solar cells and light-emitting devices. The reduction of LHP dimensions introduces an abundance of surface defects, which can strongly influence the photophysical properties of these materials. However, an insightful understanding of the effect of surface defects on hot carrier (HC) relaxation, one of the important properties of LHP NPLs, is still inadequate. Herein, the HC relaxation and trapping dynamics in pristine and surface passivated two-layer (2L) CsPbBr3 NPLs have been investigated by using time-resolved spectroscopy. The results reveal that surface defects can trap HCs directly before they relax to the band edge, which accounts for the absence of the hot-phonon bottleneck (HPB) effect in LHP NPLs. After healing surface defects with a passivation agent, the relaxation time of HCs is extended from ∼73 to ∼130 fs in 2L CsPbBr3 NPLs, indicating that the channel of HCs trapped by the surface defects can be effectively blocked. Accordingly, the HPB effect is activated in surface-passivated CsPbBr3 NPLs. The finding of surface defect-related HC relaxation dynamics is important for guiding the development of high-performance LHP NPL devices related to HCs through surface defect engineering.
{"title":"Modulating hot carrier relaxation and trapping dynamics in lead halide perovskite nanoplatelets by surface passivation","authors":"Yanshen Zhu, Shida Luo, Yuting Zhang, Yanping Liu, Yulu He, Tianfeng Li, Zhen Chi, Lijun Guo","doi":"10.1039/d4nr02560a","DOIUrl":"https://doi.org/10.1039/d4nr02560a","url":null,"abstract":"Two-dimensional (2D) lead halide perovskite (LHP) nanoplatelets (NPLs) have recently emerged as promising materials for solar cells and light-emitting devices. The reduction of LHP dimensions introduces an abundance of surface defects, which can strongly influence the photophysical properties of these materials. However, an insightful understanding of the effect of surface defects on hot carrier (HC) relaxation, one of the important properties of LHP NPLs, is still inadequate. Herein, the HC relaxation and trapping dynamics in pristine and surface passivated two-layer (2L) CsPbBr<small><sub>3</sub></small> NPLs have been investigated by using time-resolved spectroscopy. The results reveal that surface defects can trap HCs directly before they relax to the band edge, which accounts for the absence of the hot-phonon bottleneck (HPB) effect in LHP NPLs. After healing surface defects with a passivation agent, the relaxation time of HCs is extended from ∼73 to ∼130 fs in 2L CsPbBr<small><sub>3</sub></small> NPLs, indicating that the channel of HCs trapped by the surface defects can be effectively blocked. Accordingly, the HPB effect is activated in surface-passivated CsPbBr<small><sub>3</sub></small> NPLs. The finding of surface defect-related HC relaxation dynamics is important for guiding the development of high-performance LHP NPL devices related to HCs through surface defect engineering.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"23 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yongjia Huang, Jing Gu, Zijun Yan, Xueyuan Hu, Dan He, Yonghong Zhang, Yao Li, Cailing Zhong, Jie Yang, Da Shi, Ruben Abagyan, Qunyou Tan, Jingqing Zhang
Correction for ‘Cytomembrane-mimicking nanocarriers with a scaffold consisting of a CD44-targeted endogenous component for effective asparaginase supramolecule delivery’ by Yongjia Huang et al., Nanoscale, 2020, 12, 12083–12097, https://doi.org/10.1039/D0NR02588G.
{"title":"Correction: Cytomembrane-mimicking nanocarriers with a scaffold consisting of a CD44-targeted endogenous component for effective asparaginase supramolecule delivery","authors":"Yongjia Huang, Jing Gu, Zijun Yan, Xueyuan Hu, Dan He, Yonghong Zhang, Yao Li, Cailing Zhong, Jie Yang, Da Shi, Ruben Abagyan, Qunyou Tan, Jingqing Zhang","doi":"10.1039/d4nr90221a","DOIUrl":"https://doi.org/10.1039/d4nr90221a","url":null,"abstract":"Correction for ‘Cytomembrane-mimicking nanocarriers with a scaffold consisting of a CD44-targeted endogenous component for effective asparaginase supramolecule delivery’ by Yongjia Huang <em>et al.</em>, <em>Nanoscale</em>, 2020, <strong>12</strong>, 12083–12097, https://doi.org/10.1039/D0NR02588G.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"17 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liyun Lai, Shunan Wang, Yunxiao Sang, Chen Feng, Min Liu, Fang Wang, Shaoliang Lin, Quan Zhou
Circularly polarized luminescence (CPL) materials with precisely controlled emission colors and handedness are highly desirable for their promising applications in advanced optical technologies, but it is rather challenging primarily due to the lack of convenient, powerful, and universal preparation strategies. Herein, we report a simple yet versatile solution route for constructing multicolor CPL materials with controllable handedness from nonchiral luminescent charge-transfer (CT) complexes through co-assembly with chiral N-terminal aromatic amino acids. The resulting ternary co-assemblies exhibit obvious CPL signals from 489 to 601 nm, covering from blue via green and yellow to orange-red. Notably, the CPL sign can be readily inverted by changing the substituents at the α-position of amino acids or the molecular structure of achiral electron donors due to effects on the hydrogen bonds, CT interactions, and stacking patterns. This work provides a new insight for developing CPL materials with tunable color and inverted handedness.
{"title":"Multicolor and Sign-Invertible Circularly Polarized Luminescence from Nonchiral Charge-Transfer Complexes Assembled with N-Terminal Aromatic Amino Acids","authors":"Liyun Lai, Shunan Wang, Yunxiao Sang, Chen Feng, Min Liu, Fang Wang, Shaoliang Lin, Quan Zhou","doi":"10.1039/d4nr04308a","DOIUrl":"https://doi.org/10.1039/d4nr04308a","url":null,"abstract":"Circularly polarized luminescence (CPL) materials with precisely controlled emission colors and handedness are highly desirable for their promising applications in advanced optical technologies, but it is rather challenging primarily due to the lack of convenient, powerful, and universal preparation strategies. Herein, we report a simple yet versatile solution route for constructing multicolor CPL materials with controllable handedness from nonchiral luminescent charge-transfer (CT) complexes through co-assembly with chiral N-terminal aromatic amino acids. The resulting ternary co-assemblies exhibit obvious CPL signals from 489 to 601 nm, covering from blue via green and yellow to orange-red. Notably, the CPL sign can be readily inverted by changing the substituents at the α-position of amino acids or the molecular structure of achiral electron donors due to effects on the hydrogen bonds, CT interactions, and stacking patterns. This work provides a new insight for developing CPL materials with tunable color and inverted handedness.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"61 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexandre Abhervé, Nabil Mroweh, Hengbo Cui, Reizo Kato, Nicolas Vanthuyne, Pere Alemany, Enric Canadell, Narcis Avarvari
Monoanionic and neutral nickel(II) and platinum(II) bis(dithiolene) complexes based on the 5,6-diethyl-5,6-dihydro-1,4-dithiin-2,3-dithiolate (de-dddt) chiral ligand have been prepared in racemic and enantiopure forms. The neutral closed-shell species have been generated from the monoanionic precursors upon electrocrystallization. The racemic anionic (TBA)[Ni(S,S-de-dddt)(R,R-de-dddt)] complex crystallized in the centrosymmetric space group P21/c, while the neutral complexes crystallized in the enantiomorphic tetragonal space groups P41212 or P43212. Very subtle conformational differences concerning the orientation of the ethyl substituents are observed between the racemic and the enantiopure compounds, thus impacting the intermolecular interactions at the nanoscale level. Indeed, in the former, the ethyl substituents are all-axial in both independent complexes, while in the latter one of the independent complexes shows a mixed (eq, eq, ax, ax) conformation and the other independent complex of the asymmetric unit shows the all-axial conformation. Such a tenuous difference at the molecular/nanoscale level strongly impacts the conductivity of the materials. Temperature dependent high pressure single crystal conductivity measurements show activated conductivity for all the materials, with room temperature conductivity values of up to 1.3.10-3 S.cm-1 for Ni(S,S-de-dddt)2] at 12.3 GPa and 3.0.10-4 S.cm-1 for [Pt(R,R-de-dddt)2] at 12.9 GPa. Nevertheless, the racemic compounds are more conductive, i.e. 3.8.10-2 S.cm-1 for [Ni(rac-de-dddt)2] at 10.0 GPa and 1.5.10-3 S.cm-1 for [Pt(rac-de-dddt)2] at 10.5 GPa, in agreement with the shorter and more numerous S···S intermolecular contacts observed in the crystal structures of the racemic complexes. Moreover, a detailed analysis of DFT calculations suggests that the smaller band gaps and higher conductivities should occur for the racemic solids and for the Pt versus Ni complexes.
{"title":"Enantiomorphic single component conducting nickel(II) and platinum(II) bis(diethyl-dddt) crystalline complexes†","authors":"Alexandre Abhervé, Nabil Mroweh, Hengbo Cui, Reizo Kato, Nicolas Vanthuyne, Pere Alemany, Enric Canadell, Narcis Avarvari","doi":"10.1039/d4nr04048a","DOIUrl":"https://doi.org/10.1039/d4nr04048a","url":null,"abstract":"Monoanionic and neutral nickel(II) and platinum(II) bis(dithiolene) complexes based on the 5,6-diethyl-5,6-dihydro-1,4-dithiin-2,3-dithiolate (de-dddt) chiral ligand have been prepared in racemic and enantiopure forms. The neutral closed-shell species have been generated from the monoanionic precursors upon electrocrystallization. The racemic anionic (TBA)[Ni(S,S-de-dddt)(R,R-de-dddt)] complex crystallized in the centrosymmetric space group P21/c, while the neutral complexes crystallized in the enantiomorphic tetragonal space groups P41212 or P43212. Very subtle conformational differences concerning the orientation of the ethyl substituents are observed between the racemic and the enantiopure compounds, thus impacting the intermolecular interactions at the nanoscale level. Indeed, in the former, the ethyl substituents are all-axial in both independent complexes, while in the latter one of the independent complexes shows a mixed (eq, eq, ax, ax) conformation and the other independent complex of the asymmetric unit shows the all-axial conformation. Such a tenuous difference at the molecular/nanoscale level strongly impacts the conductivity of the materials. Temperature dependent high pressure single crystal conductivity measurements show activated conductivity for all the materials, with room temperature conductivity values of up to 1.3.10-3 S.cm-1 for Ni(S,S-de-dddt)2] at 12.3 GPa and 3.0.10-4 S.cm-1 for [Pt(R,R-de-dddt)2] at 12.9 GPa. Nevertheless, the racemic compounds are more conductive, i.e. 3.8.10-2 S.cm-1 for [Ni(rac-de-dddt)2] at 10.0 GPa and 1.5.10-3 S.cm-1 for [Pt(rac-de-dddt)2] at 10.5 GPa, in agreement with the shorter and more numerous S···S intermolecular contacts observed in the crystal structures of the racemic complexes. Moreover, a detailed analysis of DFT calculations suggests that the smaller band gaps and higher conductivities should occur for the racemic solids and for the Pt versus Ni complexes.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"23 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work shows an intuitive magnetron sputtering technique to synthesize vertically aligned edge-enriched MoS2 (v-MS) nanostructures. The morphology and orientation of the as-synthesized nanostructure can be modified by altering the parameters of the sputtering process. This work emphasizes the versatility of magnetron sputtering to synthesize different orientated 2D nanostructures. These structures may have diverse applications, such as optoelectronics, hydrogen evolution, sensors, energy storage and catalysis. The vertically aligned nanostructure of MoS2 is confirmed using the field emission scanning electron microscopy and Raman spectroscopy techniques. Furthermore, we studied the plasma-based nitrogen doping process with minimal damage for introducing nitrogen atoms into 2D nanomaterials. A plasma produced in a nitrogen environment, assisted by a simple radio frequency (RF) power supply, is employed for p-type doping in v-MS. The successful doping of nitrogen has been investigated through the use of Raman spectroscopy and X-ray photoelectron spectroscopy. The atomic force microscope images confirm the little surface damage resulting from the nitrogen doping technique. The change of work function resulting from doping is examined by Kelvin Probe force microscopy and ultraviolet photoelectron spectroscopy. Optical emission spectroscopy (OES) study reveals the role of nitrogen plasma ions in doping with minimal surface damaging. This work demonstrates the effective intimidation of the work function of the MoS2 nanomaterial via plasma treatment.
这项工作展示了一种合成垂直排列边缘富集 MoS2（v-MS）纳米结构的直观磁控溅射技术。通过改变溅射过程的参数，可以改变合成纳米结构的形态和取向。这项工作强调了磁控溅射合成不同取向二维纳米结构的多功能性。这些结构可以有多种应用，如光电、氢进化、传感器、储能和催化。我们利用场发射扫描电子显微镜和拉曼光谱技术确认了 MoS2 的垂直排列纳米结构。此外，我们还研究了基于等离子体的氮掺杂工艺，该工艺可将氮原子引入二维纳米材料，且损伤极小。在氮环境中产生的等离子体，在简单的射频（RF）电源辅助下，被用于 v-MS 中的 p 型掺杂。利用拉曼光谱和 X 射线光电子能谱对氮的成功掺杂进行了研究。原子力显微镜图像证实，氮掺杂技术导致的表面损伤很小。开尔文探针力显微镜和紫外光电子能谱研究了掺杂导致的功函数变化。光学发射光谱（OES）研究揭示了氮等离子体离子在掺杂过程中的作用，其表面损伤极小。这项研究表明，通过等离子体处理，MoS2 纳米材料的功函数得到了有效抑制。
{"title":"P-type doping in edge-enriched MoS2-x nanostructure via RF generated nitrogen plasma","authors":"Khomdram Bijoykumar Singh, Jyotisman Bora, Bablu Basumatary, Shakyadeep Bora, Arup Ratan Pal","doi":"10.1039/d4nr03612c","DOIUrl":"https://doi.org/10.1039/d4nr03612c","url":null,"abstract":"This work shows an intuitive magnetron sputtering technique to synthesize vertically aligned edge-enriched MoS2 (v-MS) nanostructures. The morphology and orientation of the as-synthesized nanostructure can be modified by altering the parameters of the sputtering process. This work emphasizes the versatility of magnetron sputtering to synthesize different orientated 2D nanostructures. These structures may have diverse applications, such as optoelectronics, hydrogen evolution, sensors, energy storage and catalysis. The vertically aligned nanostructure of MoS2 is confirmed using the field emission scanning electron microscopy and Raman spectroscopy techniques. Furthermore, we studied the plasma-based nitrogen doping process with minimal damage for introducing nitrogen atoms into 2D nanomaterials. A plasma produced in a nitrogen environment, assisted by a simple radio frequency (RF) power supply, is employed for p-type doping in v-MS. The successful doping of nitrogen has been investigated through the use of Raman spectroscopy and X-ray photoelectron spectroscopy. The atomic force microscope images confirm the little surface damage resulting from the nitrogen doping technique. The change of work function resulting from doping is examined by Kelvin Probe force microscopy and ultraviolet photoelectron spectroscopy. Optical emission spectroscopy (OES) study reveals the role of nitrogen plasma ions in doping with minimal surface damaging. This work demonstrates the effective intimidation of the work function of the MoS2 nanomaterial via plasma treatment.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"8 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenpu Xu, Zitai Fu, Huanbao Shi, Qi Li, Xuexia He, Jie Sun, Ruibin Jiang, Zhibin Lei, Zong-Huai Liu
Improving the rate performance is of great significance to achieve high-performance photo-assisted Li–O2 batteries for developing new optimized bifunctional photocatalysts. Herein, a holey etching strategy is developed to prepare porous siloxene nanosheets with a size of 10 nm and few layers (P-siloxene NSs) by a modified Ag+-assisted chemical etching method, and the optimized pore-forming conditions are: Ag+ ion concentration 0.01 mol dm−3, HF concentration 0.565 mol dm−3, and H2O2 concentration 0.327 mol dm−3. By using P-siloxene NSs with a bandgap of 2.77 eV as a novel bifunctional photo-assisted Li–O2 system, the rate performance of the assembled P-siloxene NSs photo-assisted Li–O2 batteries is clearly improved. At a current density of 0.1 mA cm−2, the system shows a low overpotential of 0.35 V, full discharge capacity of 3270 mA h g−1, and 69% round-trip efficiency at 100 cycles. In particular, at a current density of 0.8 mA cm−2, the P-siloxene NSs photo-assisted Li–O2 batteries still give a relatively good charge potential of 3.66 V and a discharge potential of 2.97 V. This work provides a new approach for improving the rate performance of photo-assisted Li–O2 systems and will open up opportunities for the high-efficiency utilization of solar energy in electric systems.
{"title":"Holey etching strategy of siloxene nanosheets to improve the rate performance of photo-assisted Li–O2 batteries","authors":"Wenpu Xu, Zitai Fu, Huanbao Shi, Qi Li, Xuexia He, Jie Sun, Ruibin Jiang, Zhibin Lei, Zong-Huai Liu","doi":"10.1039/d4nr03850a","DOIUrl":"https://doi.org/10.1039/d4nr03850a","url":null,"abstract":"Improving the rate performance is of great significance to achieve high-performance photo-assisted Li–O<small><sub>2</sub></small> batteries for developing new optimized bifunctional photocatalysts. Herein, a holey etching strategy is developed to prepare porous siloxene nanosheets with a size of 10 nm and few layers (P-siloxene NSs) by a modified Ag<small><sup>+</sup></small>-assisted chemical etching method, and the optimized pore-forming conditions are: Ag<small><sup>+</sup></small> ion concentration 0.01 mol dm<small><sup>−3</sup></small>, HF concentration 0.565 mol dm<small><sup>−3</sup></small>, and H<small><sub>2</sub></small>O<small><sub>2</sub></small> concentration 0.327 mol dm<small><sup>−3</sup></small>. By using P-siloxene NSs with a bandgap of 2.77 eV as a novel bifunctional photo-assisted Li–O<small><sub>2</sub></small> system, the rate performance of the assembled P-siloxene NSs photo-assisted Li–O<small><sub>2</sub></small> batteries is clearly improved. At a current density of 0.1 mA cm<small><sup>−2</sup></small>, the system shows a low overpotential of 0.35 V, full discharge capacity of 3270 mA h g<small><sup>−1</sup></small>, and 69% round-trip efficiency at 100 cycles. In particular, at a current density of 0.8 mA cm<small><sup>−2</sup></small>, the P-siloxene NSs photo-assisted Li–O<small><sub>2</sub></small> batteries still give a relatively good charge potential of 3.66 V and a discharge potential of 2.97 V. This work provides a new approach for improving the rate performance of photo-assisted Li–O<small><sub>2</sub></small> systems and will open up opportunities for the high-efficiency utilization of solar energy in electric systems.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"61 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In situ carbon-coated CoS2 micro/nano-spheres were successfully prepared by sulfuric calcination using the solvothermal method with glycerol as the carbon source without introducing extraneous carbon. This method prevents carbon agglomeration and avoids the cumbersome steps of the current technology. The composite demonstrates excellent sodium storage capacity as an anode material for sodium-ion batteries. The initial charge and discharge capacities were 1027 and 1224 mA h g−1 at 50 mA g−1, respectively, with an initial coulombic efficiency of 83.9%. The capacity of CoS2@C at 350 °C was maintained at 937 mA h g−1 after 140 cycles at a current density of 2 A g−1. The outstanding electrochemical performance is mainly attributed to the nanostructure design and the presence of in situ carbon. As revealed by the kinetic analysis, the pseudo-capacitive behaviour also contributed to the excellent electrochemical performance.
以甘油为碳源，采用溶热法进行硫煅烧，在不引入外来碳的情况下成功制备了原位碳涂层 CoS2 微/纳米球。这种方法可防止碳团聚，并避免了现有技术的繁琐步骤。作为钠离子电池的阳极材料，这种复合材料具有出色的钠储存能力。在 50 mA g-1 的条件下，初始充放电容量分别为 1027 mA h g-1 和 1224 mA h g-1，初始库仑效率为 83.9%。在电流密度为 2 A g-1 的条件下，CoS2@C 在 350 °C 下循环 140 次后，其容量保持在 937 mA h g-1。出色的电化学性能主要归功于纳米结构设计和原位碳的存在。动力学分析表明，伪电容行为也为优异的电化学性能做出了贡献。
{"title":"Facile synthesis of in situ carbon-coated CoS2 micro/nano-spheres as high-performance anode materials for sodium-ion batteries","authors":"Lingling Chen, Pengfei Wang, Chen Bao, Yanyan Li, Bo Fan, Gaofeng Li, Dianbo Ruan","doi":"10.1039/d4nr03503h","DOIUrl":"https://doi.org/10.1039/d4nr03503h","url":null,"abstract":"<em>In situ</em> carbon-coated CoS<small><sub>2</sub></small> micro/nano-spheres were successfully prepared by sulfuric calcination using the solvothermal method with glycerol as the carbon source without introducing extraneous carbon. This method prevents carbon agglomeration and avoids the cumbersome steps of the current technology. The composite demonstrates excellent sodium storage capacity as an anode material for sodium-ion batteries. The initial charge and discharge capacities were 1027 and 1224 mA h g<small><sup>−1</sup></small> at 50 mA g<small><sup>−1</sup></small>, respectively, with an initial coulombic efficiency of 83.9%. The capacity of CoS<small><sub>2</sub></small>@C at 350 °C was maintained at 937 mA h g<small><sup>−1</sup></small> after 140 cycles at a current density of 2 A g<small><sup>−1</sup></small>. The outstanding electrochemical performance is mainly attributed to the nanostructure design and the presence of <em>in situ</em> carbon. As revealed by the kinetic analysis, the pseudo-capacitive behaviour also contributed to the excellent electrochemical performance.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"234 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Silver nanowires (AgNWs) with high aspect ratios are pivotal for the production of flexible transparent conductive films (TCFs). The growth of AgNWs is significantly influenced by the strong affinity of halogen ions for silver ions. This affinity plays a crucial role in the controlled deposition of silver along the nanowire axis. By precisely controlling the concentrations of Cl− and Br− ions, we have successfully synthesized AgNWs with remarkable lengths of 96 μm and diameters of 40 nm, achieving an impressive aspect ratio of 2400. Utilizing density functional theory and molecular dynamics simulations, we investigate the impact of these ions on the growth of AgNWs. Our findings reveal that halogen ions strongly adsorb onto the Ag (100) plane in the radial direction, with Cl− ions promoting anisotropic growth and Br− ions effectively limiting the nanowire diameter, thus achieving high aspect ratio AgNWs. The resulting TCFs exhibit a high transmittance of 95.0% at 550 nm and a low sheet resistance of 14.7 Ω sq−1. Moreover, when integrated into a flexible transparent heater, these TCFs demonstrate a high heating rate of 12.1 °C s−1. The development of AgNWs is poised to significantly enhance the performance and versatility of flexible TCFs.
{"title":"Synergistic role of Cl− and Br− ions in growth control and mechanistic insights of high aspect ratio silver nanowires for flexible transparent conductive films","authors":"Jia-Lei Xu, Rui-Dong Shi, Hai-ping Zhou, Guo-Tao Xiang, Zi-Dong Zhou, Yong-Da Hu, Jin-Ju Chen","doi":"10.1039/d4nr03525a","DOIUrl":"https://doi.org/10.1039/d4nr03525a","url":null,"abstract":"Silver nanowires (AgNWs) with high aspect ratios are pivotal for the production of flexible transparent conductive films (TCFs). The growth of AgNWs is significantly influenced by the strong affinity of halogen ions for silver ions. This affinity plays a crucial role in the controlled deposition of silver along the nanowire axis. By precisely controlling the concentrations of Cl<small><sup>−</sup></small> and Br<small><sup>−</sup></small> ions, we have successfully synthesized AgNWs with remarkable lengths of 96 μm and diameters of 40 nm, achieving an impressive aspect ratio of 2400. Utilizing density functional theory and molecular dynamics simulations, we investigate the impact of these ions on the growth of AgNWs. Our findings reveal that halogen ions strongly adsorb onto the Ag (100) plane in the radial direction, with Cl<small><sup>−</sup></small> ions promoting anisotropic growth and Br<small><sup>−</sup></small> ions effectively limiting the nanowire diameter, thus achieving high aspect ratio AgNWs. The resulting TCFs exhibit a high transmittance of 95.0% at 550 nm and a low sheet resistance of 14.7 Ω sq<small><sup>−1</sup></small>. Moreover, when integrated into a flexible transparent heater, these TCFs demonstrate a high heating rate of 12.1 °C s<small><sup>−1</sup></small>. The development of AgNWs is poised to significantly enhance the performance and versatility of flexible TCFs.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"63 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Siyun Noh, Jaehyeok Shin, Seunghwan Jhee, Sumin Kang, Yumin Lee, Jin Soo Kim
Rapid advances in the internet of things have created various platforms for health monitoring, wearable devices, electronic skins, and smart robots. Practical realization of these new technologies inevitably requires a power supply. In this paper, we report self-powered triboelectric sensors (TESs), which incorporate GaN nanowires (NWs) grown on a Si(111) substrate as an active medium, and which are inspired by the structure of the human epidermis and dermis. The TESs were fabricated by stacking polydimethylsiloxane (PDMS) directly on GaN NWs on Si(111) and the formation of an electrode underneath the substrate. The PDMS layer forms interlocked nanoridge structures, which mimic the structure of the interface between the human epidermal and dermal layer, at the interface with the top surface of the GaN NWs. The interlocked nanoridge structures efficiently induce the transmission of stress to the underlying NWs, resulting in high triboelectric charge density and voltage. When the top surface of the TES is touched with a human finger, in the absence of an external power supply, maximum output voltage and power density of 14.7 V and 63.7 mW/m2 were measured, respectively. These outputs are much higher than any of those that were previously reported.
物联网的快速发展为健康监测、可穿戴设备、电子皮肤和智能机器人创造了各种平台。这些新技术的实际应用不可避免地需要电源。在本文中，我们报告了自供电三电传感器（TES），该传感器采用生长在硅(111)基底上的氮化镓纳米线（NW）作为活性介质，其灵感来源于人体表皮和真皮的结构。在 Si(111) 基板上的 GaN 纳米线上直接堆叠聚二甲基硅氧烷 (PDMS)，并在基板下方形成电极，从而制造出 TES。PDMS 层在与 GaN NWs 顶面的界面上形成了互锁的纳米脊结构，这种结构模仿了人体表皮层和真皮层之间的界面结构。互锁的纳米脊结构能有效地将应力传导到下层的氮化镓晶片，从而产生较高的三电荷密度和电压。在没有外部电源的情况下，当人的手指触摸 TES 的顶面时，测得的最大输出电压和功率密度分别为 14.7 V 和 63.7 mW/m2。这些输出功率远高于之前报道的任何输出功率。
{"title":"Self-powered triboelectric sensor using GaN nanowires and stress concentration structure","authors":"Siyun Noh, Jaehyeok Shin, Seunghwan Jhee, Sumin Kang, Yumin Lee, Jin Soo Kim","doi":"10.1039/d4nr03260h","DOIUrl":"https://doi.org/10.1039/d4nr03260h","url":null,"abstract":"Rapid advances in the internet of things have created various platforms for health monitoring, wearable devices, electronic skins, and smart robots. Practical realization of these new technologies inevitably requires a power supply. In this paper, we report self-powered triboelectric sensors (TESs), which incorporate GaN nanowires (NWs) grown on a Si(111) substrate as an active medium, and which are inspired by the structure of the human epidermis and dermis. The TESs were fabricated by stacking polydimethylsiloxane (PDMS) directly on GaN NWs on Si(111) and the formation of an electrode underneath the substrate. The PDMS layer forms interlocked nanoridge structures, which mimic the structure of the interface between the human epidermal and dermal layer, at the interface with the top surface of the GaN NWs. The interlocked nanoridge structures efficiently induce the transmission of stress to the underlying NWs, resulting in high triboelectric charge density and voltage. When the top surface of the TES is touched with a human finger, in the absence of an external power supply, maximum output voltage and power density of 14.7 V and 63.7 mW/m<small><sup>2</sup></small> were measured, respectively. These outputs are much higher than any of those that were previously reported.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"37 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the field of nonlinear optics and physical quantity detection, the use of the second harmonic wave (SHW) generated in ferroelectric crystals is proposed to realize multi-physical quantity detection with the Janus property. In view of the single physical quantity detected by the current research and the single application scenario, this paper proposes multi-functional and novel nonlinear Janus metastructure (NJMS), which exploits the SHW to achieve highly sensitive multi-physics detection in the terahertz frequency range and shows Janus properties in both the forward and backward directions of the system. NJMS is realized to detect refractive indices, thicknesses, and angles with different modes in the forward and backward directions. The proposed NJMS broadens the application scenario of the SHW and provides a novel idea for the research of multi-physical detection devices with the property of Janus.
{"title":"A layered Janus Metastructure for multi-physical detection based on second harmonic wave","authors":"Yu-Xin Wei, Junyang Sui, Chuan-Qi Wu, Chu-Ming Guo, Xiang Li, Haifeng Zhang","doi":"10.1039/d4nr03341h","DOIUrl":"https://doi.org/10.1039/d4nr03341h","url":null,"abstract":"In the field of nonlinear optics and physical quantity detection, the use of the second harmonic wave (SHW) generated in ferroelectric crystals is proposed to realize multi-physical quantity detection with the Janus property. In view of the single physical quantity detected by the current research and the single application scenario, this paper proposes multi-functional and novel nonlinear Janus metastructure (NJMS), which exploits the SHW to achieve highly sensitive multi-physics detection in the terahertz frequency range and shows Janus properties in both the forward and backward directions of the system. NJMS is realized to detect refractive indices, thicknesses, and angles with different modes in the forward and backward directions. The proposed NJMS broadens the application scenario of the SHW and provides a novel idea for the research of multi-physical detection devices with the property of Janus.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"11 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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