Jingchao Song  Jian Yuan  Fang Xia  Jingying Liu  Yupeng Zhang  Yu Lin Zhong  Jialu Zheng  Yan Liu  Shaojuan Li  Meng Zhao  Zhiming Tian  Rachel A. Caruso  Kian Ping Loh  Qiaoliang Bao 《Advanced Electronic Materials》2016,2(5)

  相似文献   

    

Yankun Yin  Xuyuan Hou  Bingze Wu  Jiajun Dong  Mingguang Yao 《Advanced functional materials》2024,34(49):2411472

Heterogeneous structured nanomaterials can be considered as a class of advanced materials that integrate multiple phases, different elements, or components into a single nanoscale structure. For such materials, the different phases, components and their interactions are highly variable and tunable, which open a new avenue for the creation of new materials with unique properties unattainable by the corresponding single-phase materials. In this review, heterogeneous structured nanomaterials constructed by different carbon allotropes are focused. Due to the unique bonding ability of carbon element, the diverse heterogeneous structures constructed by carbon structures with different dimensions possess distinctive structures and exhibit fascinating properties, providing unprecedented opportunities for various application fields, including electronic/optoelectronic devices, superhard materials, etc. This review provides a systematic elaboration for carbon-based heterogeneous structured nanomaterials, highlighting their dimension-dependent structural diversity, unique properties, and application prospects.  相似文献   

    

Hang Li  Xinyu Ding  Mengfei Su  Chunyan Zhang  Feng Gao  Qingyi Lu 《Advanced functional materials》2024,34(42):2405339

Space charge transfer, which can be provided by heterogeneous structure, is the key to efficient electrocatalytic processes. However, difficulty in controlling the relative atomic diffusion rates due to different atomic radii and affinity makes heterogeneous nanostructures difficult to be accurately designed. Herein, an induced diffusion strategy based on affinity differences between elements is proposed to direct the separation/aggregation of different components in the precursor. The key to strategy in this study is the different affinity of Cu and Co to S/P in the precursor of CuCo Prussian blue analogue (PBA). By controlling the molar ratio of S and P during the phosphorization/vulcanization process, induced diffusion can be achieved and leads to directional separation/aggregation of Cu and Co species. As a result, a heterogeneous yolk-shell Cu₂S@CoP₂-C-N-S structure is successfully synthesized with a reticular CoP2-C-N-Cu-S as the shell and a Cu₂S nanocrystal as the core. The space charge effect of the semiconductor heterojunction resulting from component separation/aggregation significantly promotes oxygen evolution reaction, resulting in an ultralow overpotential of 180 mV at 10 mA·cm⁻². This work not only provides a simple method for efficient separation of key components in gas-solid systems but also provides a method for fine-tuning the active site in an active-site-engineering approach.  相似文献   

    

Jie Gong  Yichen Wei  Yifei Wang  Zhenyu Feng  Jinran Yu  Liuqi Cheng  Mingxia Chen  Linlin Li  Zhong Lin Wang  Qijun Sun 《Advanced functional materials》2024,34(48):2408435

Neuromorphic devices capable of emulating biological synaptic behaviors are crucial for implementing brain-like information processing and computing. Emerging 2D ferroelectric neuromorphic devices provide an effective means of updating synaptic weight aside from conventional electrical/optical modulations. Here, by further synergizing with an energy-efficient synaptic plasticity strategy, a multimodal mechano-photonic synaptic memory device based on 2D asymmetric ferroelectric heterostructure is presented, which can be modulated by external mechanical behavior and light illumination. By integrating the asymmetric ferroelectric heterostructured field-effect transistor and a triboelectric nanogenerator, the mechanical displacement-derived triboelectric potential is ready for gating, programming, and plasticizing the synaptic device, resulting in superior electrical properties of high on/off ratios (> 10⁷), large storage windows (equivalent to ≈95 V), excellent charge retention capability (> 10⁴ s), good endurance (> 10³ cycles), and primary synaptic behaviors. Besides, optical illumination can effectively synergize with mechanoplasticity to implement multimodal spatiotemporally correlated dynamic logic. The demonstrated multimodal memory synapse provides a facile and promising strategy for multifunctional sensory memory, interactive neuromorphic devices, and future brain-like electronics embodying artificial intelligence.  相似文献   

    

Wen Jin  Xinlu Li  Gaojie Zhang  Hao Wu  Xiaokun Wen  Li Yang  Jie Yu  Bichen Xiao  Fei Guo  Wenfeng Zhang  Jia Zhang  Haixin Chang 《Advanced functional materials》2024,34(37):2402091

Magnetic tunnel junctions (MTJs) are widely applied in spintronic devices for efficient spin detection through the imbalance of spin polarization at the Fermi level. The van der Waals (vdW) property of 2D magnets with atomically flat surfaces and negligible surface roughness greatly facilitates the development of MTJs, primarily in ferromagnets. Here, A-type antiferromagnetism in 2D vdW single-crystal (Fe_0.8Co_0.2)₃GaTe₂ is reported with T_N ≈ 203 K in bulk and ≈ 185 K in 9-nm nanosheets. The metallic nature and out-of-plane magnetic anisotropy make it a suitable candidate for MTJ electrodes. By constructing heterostructures based on (Fe_0.8Co_0.2)₃GaTe₂/WSe₂/Fe₃GaTe₂, a large tunneling magnetoresistance (TMR) ratio of 180% at low temperature is obtained, with the TMR signal persisting at near-room temperature 280 K. Furthermore, the TMR is tunable by the electric field, and the MTJ device operates stably with a low applied bias down to 1 mV (≈0.6 nA), highlighting its potential for energy-efficient spintronic devices. This work opens up new opportunities for 2D antiferromagnetic spintronics and quantum devices.  相似文献   

    

Hao Xiong  Chengfeng Du  Zelin Ma  Richeng Zhi  Shuangshuang Hao  Xiangyuan Zhao  Zhe Liu  Fei Xu  Hongqiang Wang 《Advanced functional materials》2024,34(37):2402298

Electrocatalytic hydrogen evolution reaction (HER) via alkaline water splitting holds great promise for industrial clean hydrogen production but is frustrated by limited catalytic activity and inferior stability under high current density. Elaborate manipulating of heterostructure on robust catalytic electrodes is essential but challenging for accelerating HER kinetics with high durability. Herein, a robust nickel mesh electrode, offering high mechanical stability, is directly engineered with catalytic layers of multiple heterostructures (r-Mn–Ni/CoP) via facile one-pot electrodeposition followed by surface reconstruction strategy. The abundant heterostructures composed of crystalline CoP, NiP, amorphous region, and additional Mn doping considerably manipulate the electronic structure with optimized charge transfer; while the in situ surface-reconstructed hydrophilic nanoflakes enable the rapid wetting of active sites to the electrolyte. Consequently, the r-Mn–Ni/CoP requires only 134 mV overpotential at the current density of 100 mA cm⁻², superior to monophasic and undoped samples, and the majority of reported HER catalysts. Remarkably, an electrolyzer with r-Mn–Ni/CoP on a nickel mesh cathode demonstrates extraordinary activity with a voltage of 1.734 V at 300 mA cm⁻² and stable operation of 800 h. The finding provides a feasible strategy for the fabrication of nonprecious-metal-based HER electrocatalysts with high activity and stability toward industrial water electrolysis.  相似文献   

    

Kang Qin  Zong-yan Zuo  Sheng Peng  Kai Liu  Hui Yang  Qi-hang Zhang  Yan-qing Lu  Yong-yuan Zhu  Xue-jin Zhang 《Advanced Optical Materials》2024,12(1):2301229

New two-dimensional (2D) van der Waals materials are emerging, and their optical parameters urgently need to be acquired experimentally. Most of the reported results come from traditional metrologies used in the past for bulk materials. This unavoidably causes controversy regarding the correctness and accuracy of results, as well as the physical model. Surface/interface plasmon polariton waves are sub-diffraction-limited and very sensitive to surroundings. Here, 2D van der Waals materials with metal embodied are presented. Surface/interface exciton-plasmon polaritons come into being with excitons in 2D transition-metal dichalcogenides (TMDCs), which are physically taken as the boundary conditions with complex optical conductivities at the interfaces. Complex optical conductivities of 2D TMDCs are measured by means of interference behavior of surface/interface polariton waves. The size requirement of 2D van der Waals materials becomes relaxed, and complex optical conductivities can be measured for single-crystalline WS₂ and MoS₂ monolayers with small sizes. Furthermore, a remarkable capability is manifested by yielding complex optical conductivity of van der Waals heterostructures. The proposed metrology can apply to other newly developed materials with modified underlying physical models, as well as various types of 2D van der Waals materials.  相似文献   

    

Stefania Porcu  Francesco Secci  Pier Carlo Ricci 《Molecules (Basel, Switzerland)》2022,27(20)

Heterogeneous photocatalysts have garnered extensive attention as a sustainable way for environmental remediation and energy storage process. Water splitting, solar energy conversion, and pollutant degradation are examples of nowadays applications where semiconductor-based photocatalysts represent a potentially disruptive technology. The exploitation of solar radiation for photocatalysis could generate a strong impact by decreasing the energy demand and simultaneously mitigating the impact of anthropogenic pollutants. However, most of the actual photocatalysts work only on energy radiation in the Near-UV region (<400 nm), and the studies and development of new photocatalysts with high efficiency in the visible range of the spectrum are required. In this regard, hybrid organic/inorganic photocatalysts have emerged as highly potential materials to drastically improve visible photocatalytic efficiency. In this review, we will analyze the state-of-art and the developments of hybrid photocatalysts for energy storage and energy conversion process as well as their application in pollutant degradation and water treatments.  相似文献   

    

Gyanaranjan Prusty  Amit K. Guria  Indranil Mondal  Anirban Dutta  Dr. Ujjwal Pal  Dr. Narayan Pradhan 《Angewandte Chemie (International ed. in English)》2016,55(8):2705-2708

A generic modular synthetic strategy for the fabrication of a series of binary‐ternary group II‐VI and group I‐III‐VI coupled semiconductor nano‐heterostructures is reported. Using Ag₂Se nanocrystals first as a catalyst and then as sacrificial seeds, four dual semiconductor heterostructures were designed with similar shapes: CdSe‐AgInSe₂, CdSe‐AgGaSe₂, ZnSe‐AgInSe₂, and ZnSe‐AgGaSe₂. Among these, dispersive type‐II heterostructures are further explored for photocatalytic hydrogen evolution from water and these are observed to be superior catalysts than the binary or ternary semi‐conductors. Details of the chemistry of this modular synthesis have been studied and the photophysical processes involved in catalysis are investigated.  相似文献   

    

Xiaohui Yang;Jiang Ma;Baijiang Lv;Hanxian Hu;Tulai Sun;Miaocong Li;Lei Qiao;Siqi Wu;Qian Tao;Guang-Han Cao;Zhu-An Xu 《Europhysics letters》2019,128(1)

We report the discovery of superconductivity with a maximum T_c ≈ 1.85 K in a new misfit layered compound ,which consists of alternating layers of a distorted rocksalt layer PbSe and a double-layer dichalcogenide . A large anisotropic parameter of resistivity and that of the upper critical field = are obtained. The estimated c-axis coherence length is comparable to the c-axis lattice constant. Moreover,the estimated upper critical field ,significantly exceeding the Pauli paramagnetic limit. All these data indicate a quasi-two-dimensional nature of the superconducting properties in . Compared with the physical properties of the misfit compound superconductor with only the half-layer of the unit,our study suggests that the enhancement of T_c in with double TaSe₂ layers is presumably related to the increase in hole carrier density. The reduced charge transfer from the PbSe layer to the conducting TaSe₂ layer could account for the variation in the charge carrier density.https://doi.org/10.1209/0295-5075/128/17004  相似文献