一步法制备单层二硫化钼纳米片

文章介绍了一种离子液体辅助的超声剥离层状二维纳米材料二硫化钼的方法,通过优化实验方法,单层二硫化钼纳米片的产率超过10%,剥离的二硫化钼纳米片均为小尺寸。这种简易的制备二硫化钼纳米片的方法有望实现大规模的制备,拓展了二硫化钼纳米片在半导体、光电和生物医学领域的应用。     

二维纳米材料改性氰酸酯树脂研究进展

综述了二维纳米材料对氰酸酯树脂(CE)改性的研究成果。介绍了目前应用于CE树脂上的二维纳米材料，包括石墨烯及其衍生物、氮化硼、层状双金属氢氧化物、二硫化钼、蒙脱土等，介绍了二维纳米粒子的结构与性质特点。介绍了CE/二维纳米粒子复合材料制备时粒子的预处理、混入与复合材料固化成型的方法。梳理了这些二维纳米材料在改善CE树脂力学、导电、介电、导热、吸波、耐摩擦、热膨胀和阻燃等性能的作用机理和效果。     

碳纳米材料在橡胶中的应用研究进展

介绍了新型零维碳纳米材料(富勒烯、炭黑-白炭黑双相粒子)、一维碳纳米材料(碳纳米纤维、碳纳米管)以及二维碳纳米材料(石墨烯、氧化石墨烯)在橡胶中的应用研究进展,指出了碳纳米材料今后的研发方向。     

单层二硫化钼纳米片的剥离制备和生物医学应用

作为一种具有类石墨烯结构的二维层状纳米材料,单层二硫化钼凭借其独特的带隙结构、光热传感以及良好的生物相容性,在肿瘤光热治疗、生物传感等生物医学领域具有广阔的研究前景。结合近五年的研究,综述了几种常见的二硫化钼剥离方法,同时介绍了单层二硫化钼纳米片在生物医学领域中的研究现状。     

二维层状材料在涂层防腐中的研究进展

二维层状材料由于其独特的形貌结构、较高的比表面积、优异的物理机械性能等优势在涂层防腐中受到了广泛的关注。结合国内外最新研究，综述了近年来石墨烯、六方氮化硼、二硫化钼、水滑石及蒙脱土等二维层状材料在涂层防腐中的研究进展，并对各类二维层状材料应用于涂层防腐中的防腐效果进行了对比与总结，最后对二维层状材料在涂层防腐中的发展趋势进行了展望。     

二维纳米片基复合相变储热材料研究进展

相变材料（PCMs）作为潜热储存和释放的介质,能够解决热能供需矛盾,从而缓解能源危机。纯相变材料具有能量密度高、温度范围广、能量输出稳定性强等优点,但其热导率低和在相变过程发生渗漏的缺点阻碍了其广泛的应用和发展。通过将PCMs与二维纳米片复合,PCMs热导率低和渗漏问题被有效解决。通过在导热机理方面进行详细阐述的基础上,综述了近几年来有关碳基二维纳米片、六方氮化硼（h-BN）纳米片、二硫化钼等复合储热材料的研究进展,为高性能二维纳米片基复合PCMs的设计提供一定的研究思路。     

国家纳米中心等在晶体光学各向异性研究中获进展

<正>近日,国家纳米科学中心戴庆团队和美国石溪大学教授刘梦昆等合作,利用近场光学技术克服了范德华晶体有限尺寸导致的表征困难,成功测量了氮化硼及二硫化钼的介电张量,发展了新的晶体光学各向异性表征方法。石墨烯、氮化硼、过渡金属硫族化合物等新型二维材料都属于范德华晶体,各自具有优良的力学、电学、光学性质,是构筑功能可控范德华异质结的基本单元,也是组成下一代高性能光电器件的基础材料。范德华晶体具有层状结构,在     

基于化学气相沉积法的纳米二硫化钼研究进展

纳米二硫化钼(MoS_2)是一种典型的过渡金属硫化物材料,因具有层状二维结构,成为新型纳米材料的研究热点。本文对化学气相沉积法(CVD)制备单层二硫化钼结构进行介绍,综述了纳米二硫化钼的生长机理、合成纳米二硫化钼光电性质与层数的关系,并对比了化学气相法和剥离法生成的二硫化钼场效应管光电性质与层数的关系,阐述了单层二硫化钼场效应管的结构和电学特性。最后,对纳米二硫化钼的应用领域与研究趋势进行了展望。     

二维层状氮化硼纳米材料的制备与应用研究进展

氮化硼纳米材料作为一种新兴材料有着自身特有的物理化学性能,其独有的形貌结构和表面化学性质使其在复合材料、吸附、催化等领域显现出极大的研究意义,因此氮化硼纳米材料的合成及性能研究成为低维纳米材料现阶段主要的研究热点,本文概述了二维层状氮化硼纳米材料的总体性质,探讨了氮化硼纳米材料的几种合成方法,分析了应用研究现状及存在的问题,并对其在催化方面的应用研究进行展望。     

基于二维纳米材料的水处理功能膜研究进展

二维纳米材料是制备膜材料中一类重要的掺杂材料或膜构筑单元,也是新型水处理功能膜的研究热点。已有许多研究报道了二维纳米材料通过有序的堆叠和自组装在膜内构建出规整的水通道,可以赋予膜可调控的分离性能,进而实现trade-off效应的突破,被认为是“下一代膜材料”（next-generation membranes）。同时,二维纳米材料的独特片层结构、催化性能及可修饰性可使膜材料获得新的功能,如导电性能、光/电催化性能等。本文综述了近年来基于二维纳米材料的水处理功能膜研究进展,重点介绍了共混法、自组装等制备方法,并总结了此类功能膜在抗污染、膜通量恢复、强化污染物去除、调控盐截留及污染物监测领域的应用。最后对基于二维纳米材料的水处理功能膜发展方向,如限域催化、调控盐分离、监测传感等新兴领域进行了分析和展望。     

氮化硼纳米片改性复合材料导热性能的研究进展

氮化硼纳米片（BNNSs）是一种二维片状纳米材料，具有较高的导热性和热稳定性。将其作为填料加入聚合物中，可显著提高复合材料的导热性能。本文基于近年来对BNNSs改性复合材料的导热性能的研究进展，总结了BNNSs制备和改性的方法以及建立导热路径的方法，介绍了该体系复合材料的导热机理，分析了影响复合材料导热性能的因素，最后对提高复合材料的导热性能进行了展望。     

Solution-processed white graphene-reinforced ferroelectric polymer nanocomposites with improved thermal conductivity and dielectric properties for electronic encapsulation

The recent surge in graphene research has stimulated interest in the investigation of various two-dimensional (2D) nanomaterials, including 2D boron nitride (BN) nanostructures. Among these, hexagonal boron nitride nanosheets (h-BNNs; also known as white graphene, as their structure is similar to that of graphene) have emerged as potential nanofillers for preparing thermally conductive composites. In this work, hexagonal boron nitride nanoparticles (h-BNNPs) approximately 70 nm in size were incorporated into a polyvinylidene fluoride (PVDF) matrix with different loadings (0–25 wt.%). The PVDF/h-BNNP nanocomposites were prepared by a solution blending technique and characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), polarized optical microscopy (POM) and scanning electron microscopy (SEM). In addition, the thermal conductivity and dielectric properties of the nanocomposites were investigated. The incorporation of h-BNNPs in the PVDF matrix resulted in enhanced thermal conductivity. The highest value, obtained at 25 wt.% h-BNNP loading, was 2.33 W/mK, which was five times that of the neat PVDF (0.41 W/mK). The thermal enhancement factor (TEF) at 5 wt.% h-BNNP loading was 78%, increasing to 468% at 25 wt.% h-BNNP loading. The maximum dielectric constant of approximately 36.37 (50Hz, 150 °C) was obtained at 25 wt.% h-BNNP loading, which was three times that of neat PVDF (11.94) at the same frequency and temperature. The aforementioned results suggest that these multifunctional and high-performance nanocomposites hold great promise for application in electronic encapsulation.     

Green and efficient production of boron nitride nanosheets via oxygen doping-facilitated liquid exfoliation

As the structural analogue of graphene, boron nitride nanosheets (BNNSs) are anticipated to have a wide range of potential applications. BNNSs exhibit good mechanical properties, outstanding thermal conductivity, oxidation and chemical stability and are excellent electrical insulators. While BNNSs have gained recognition as one of the most versatile 2D materials in recent years, their application in research and industry is still hampered by the lack of methods to produce BNNSs in large quantity and a cost-effective way. In this study, we report highly efficient h-BN exfoliation via the oxygen doping-facilitated liquid exfoliation. Oxygen atoms are introduced into the hexagonal boron nitride (h-BN) structure via a facile thermal treatment. The relationship of thermal treatment, structural changes and h-BN exfoliation are studied to elucidate the key factor for advancing the BNNS production. The optimum concentration of hydroxyl groups and weakening of interlayer interactions have synergistically facilitated the delamination of h-BN in water under mild exfoliation conditions, resulting in up to 1255% yield increment and without noticeable new defects in the BNNS structure as compared with the untreated control. An efficient and environmentally friendly exfoliation process of h-BN is a crucial starting point towards the cost-effective and mass production of BNNSs which is needed for the currently identified and myriad future applications of BNNSs.     

石墨烯基气凝胶的制备及油吸附性能研究进展

海上漏油的频繁发生以及采油废水、工业含油污水的大量排放造成水资源大片污染和生态系统平衡的严重破坏。目前，从水体中分离油品和有机污染物已受到越来越多的商业和学术的关注。石墨烯基气凝胶是由二维石墨烯片层组装成的三维宏观材料，因其孔隙率高、比表面积大、密度低、机械性能强等特点在油水分离领域具有广阔的应用前景，已成为当今的研究热点之一。本文结合最新研究进展系统地总结了石墨烯基气凝胶的结构设计、组装及干燥方法，归纳了近年来其在油水分离中的应用进展，并对石墨烯基气凝胶在油水分离领域的研究现状和未来研究方向做了简要评述，以期为该领域的深入探索提供新的视角。     

Urchin-like boron nitride hierarchical structure assembled by nanotubes-nanosheets for effective removal of heavy metal ions

Water pollution has become a serious global issue owing to the large amounts of contaminants generated from industrial and agricultural development. Recently, various boron nitride-based micro/nano-materials have exhibited efficient sorption capacity for contaminants from water. Herein, novel urchin-like boron nitride hierarchical structure assembled by free-growing boron nitride nanotubes and crapy boron nitride nanosheets is firstly fabricated via a sample two-step approach, including the synthesis of analogous "core-shell" structured boron-containing precursor and thermal catalytic chemical vapor deposition. A combined growth mechanism of vapor-liquid-solid and vapor-solid is proposed to control the formation of BN hierarchical structure. The unique structure exhibits superior removal capacity of 115.07?mg?g^?1 and 92.85?mg?g^?1 for Pb²⁺ and Cu²⁺ in water solution, respectively. The excellent adsorption performance of the product mainly derives from the vast lattice imperfections, the high-density edge active sites, the expanded interplanar spacing, as well as the unique structural characteristics. They are beneficial for structural stability and enough space for accommodating the adsorbed heavy metal ions. These results indicate that the urchin-like boron nitride hierarchical structure is a promising adsorption material for water treatment.     

Excellent electrical conductivity of the exfoliated and fluorinated hexagonal boron nitride nanosheets

The insulator characteristic of hexagonal boron nitride limits its applications in microelectronics. In this paper, the fluorinated hexagonal boron nitride nanosheets were prepared by doping fluorine into the boron nitride nanosheets exfoliated from the bulk boron nitride in isopropanol via a facile chemical solution method with fluoboric acid; interestingly, these boron nitride nanosheets demonstrate a typical semiconductor characteristic which were studied on a new scanning tunneling microscope-transmission electron microscope holder. Since this property changes from an insulator to a semiconductor of the boron nitride, these nanosheets will be able to extend their applications in designing and fabricating electronic nanodevices.     

Van der Waals epitaxy and characterization of hexagonal boron nitride nanosheets on graphene

Graphene is highly sensitive to environmental influences, and thus, it is worthwhile to deposit protective layers on graphene without impairing its excellent properties. Hexagonal boron nitride (h-BN), a well-known dielectric material, may afford the necessary protection. In this research, we demonstrated the van der Waals epitaxy of h-BN nanosheets on mechanically exfoliated graphene by chemical vapor deposition, using borazine as the precursor to h-BN. The h-BN nanosheets had a triangular morphology on a narrow graphene belt but a polygonal morphology on a larger graphene film. The h-BN nanosheets on graphene were highly crystalline, except for various in-plane lattice orientations. Interestingly, the h-BN nanosheets preferred to grow on graphene than on SiO₂/Si under the chosen experimental conditions, and this selective growth spoke of potential promise for application to the preparation of graphene/h-BN superlattice structures fabricated on SiO₂/Si.