Probing the edge-related properties of atomically thin MoS2 at nanoscale

层状二维材料具有独特的物理化学性质，使其在光电器件、传感、能源和催化等领域得到了高度关注和广泛应用。二维材料在制备过程中不可避免引入结构缺陷，虽然这些缺陷尺度仅为数纳米甚至单原子，但是会极大地改变材料的结构和电子性质，从而影响其应用。化学化工学院任斌教授课题组在层状二维材料缺陷表征方面取得进展。该工作表明了TERS在原位、高空间分辨表征缺陷位的结构和电子性质方面具有独特的优势，可以进一步推广到其他二维材料，从而有效地指导缺陷设计和材料应用。 该工作通过校内外课题组紧密合作，在任斌教授、谭平恒研究员（中科院半导体研究所）和王翔博士共同指导下完成。实验部分主要由黄腾翔博士（第一作者，已毕业化学系博士生）完成，电子能带结构与光谱理论计算由谭平恒研究员课题组从鑫博士生（共同第一作者）完成，吴思思、林楷强、姚旭、何玉韩、吴江滨、包一凡、黄声超等参与了实验与讨论。【Abstract】Defects can induce drastic changes of the electronic properties of two-dimensional transition metal dichalcogenides and influence their applications. It is still a great challenge to characterize small defects and correlate their structures with properties. Here, we show that tipenhanced Raman spectroscopy (TERS) can obtain distinctly different Raman features of edge defects in atomically thin MoS2, which allows us to probe their unique electronic properties and identify defect types (e.g., armchair and zigzag edges) in ambient. We observed an edgeinduced Raman peak (396 cm−1) activated by the double resonance Raman scattering (DRRS) process and revealed electron–phonon interaction in edges. We further visualize the edge-induced band bending region by using this DRRS peak and electronic transition region using the electron density-sensitive Raman peak at 406 cm−1. The power of TERS demonstrated in MoS2 can also be extended to other 2D materials, which may guide the defect engineering for desired properties.The authors acknowledge the final supports from MOST of China (2016YFA0200601 and 2016YFA0301204), NSFC (21633005, 21790354, 21503181, 21711530704, 21621091, 11874350, 11474277, and 11434010), Natural Science Foundation of Fujian Province (2016J05046), and China Postdoctoral Science Foundation (2017M622062). 研究工作得到科技部、国家自然科学基金委员会、福建省自然科学基金和中国博士后基金资助

Small fixed-wing unmanned aerial vehicle recovery system

本发明涉及无人机回收领域，具体地说是一种小型固定翼无人机回收系统，包括无人船、滑轨台、拦阻索、回收网系统、无人机和相对设置的机械臂，滑轨台设置于无人船上，在所述滑轨台上设有滑轨，且所述相对设置的机械臂分别可移动地设置于不同的滑轨上，所述相对设置的机械臂动力输出端通过拦阻索相连，所述回收网系统包括主架体和设置于主架体之间的回收网，且回收网两侧的主架体分别可移动地设置于不同的滑轨上，在所述无人机上设有连接钩，且所述无人机降落时，所述连接钩先钩住所述拦阻索，然后无人机落入所述回收网中。本发明将无人船与无人机结合，能够实现在无人船上对小型固定翼无人机有效拦截回收

面向固定翼无人机海上回收的拦阻钩测试系统及方法

本发明涉及一种面向固定翼无人机海上回收的拦阻钩测试系统及方法，其中模拟测试车可移动地设于导向架体中，缓冲架体两侧均设有带升降滑块的回收绳高度调节组件，所述滑块上设有回收绳转向组件，所述回收绳转向组件设有张力传感器，每个回收绳高度调节组件底端均设有回收绳收放组件，且回收绳两端分别绕过对应侧回收绳转向组件上的张力传感器后绕置于对应侧的回收绳收放组件中，所述模拟测试车下侧设有拦阻钩与所述回收绳配合，所述模拟测试车上设有参数捕捉模块，任一回收绳高度调节组件上设有云台摄像机。本发明测试成本低且能对拦阻钩动作时的瞬间进行深入分析，并通过试验测试可分析估算出回收绳的最优拉力以及拦阻钩最佳参数

一种基于显微图像的激光栅线成形质量自动检测方法

本发明提供一种基于显微图像的激光栅线成形质量自动检测方法，包括：获取测量数据：进行激光栅线成形工艺试验，由三维形貌测量工具获取栅线表面高度数据并存储为数字量；提出测量指标：等效遮挡宽度、等效导电面积、无量纲的等效高宽比；编写计算机程序实现测量指标的自动测量。依据本发明可快速检测栅线成形质量是否合格或者符合预期，对工艺参数探索优化及激光栅线成形技术的工程应用均有较大意义

己内酰胺在硫酸铵晶体表面吸附特性

In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide（CPB）,dodecyltrimethylammonium bromide（DTAB）,non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate（SDS）and sodium dodecyl benzene sulfonate（SDBS）increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases

己内酰胺在硫酸铵晶体表面吸附特性

In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide（CPB）,dodecyltrimethylammonium bromide（DTAB）,non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate（SDS）and sodium dodecyl benzene sulfonate（SDBS）increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases

己内酰胺在硫酸铵晶体表面吸附特性

In the caprolactam production process,ammonium sulfate grains inevitably entrain a small amount of amide oil,when the grains settle and separate in the gas-liquid-liquid-solid crystallization reactor.Amide oil entrainment causes waste of caprolactam and pollution of ammonium sulfate.By adding surfactants and changing experimental conditions,the entrainment of amide oil was reduced.The influence of surfactant,pH,temperature,and grain size on adsorption behavior of amide oil on the surface of ammonium sulfate crystal was evaluated from the adsorption equilibrium under shaking.The results show that cationic surfactant cetylpyridinium bromide（CPB）,dodecyltrimethylammonium bromide（DTAB）,non-ionic surfactant Tween 80,and the mixture of non-ionic surfactant Triton X-100 and DTAB reduce the caprolactam adsorption on the surface of ammonium sulfate crystals,while anionic surfactant sodium lauryl sulfate（SDS）and sodium dodecyl benzene sulfonate（SDBS）increase the caprolactam adsorption.In the range of 2—7,pH does not significantly affect the adsorption behavior.Between 50—80℃,amide oil adsorption on the surface of ammonium sulfate increases with temperature.With increasing ammonium sulfate particle size,the adsorption of amide oil decreases

Characterization of Grid Lines Formed by Laser-Induced Forward Transfer and Effect of Laser Fluence on the Silver Paste Transformation

The investigation of novel approaches for forming solar cell grid lines has gained importance with the rapid development of the photovoltaic industry. Laser-induced forward transfer (LIFT) is a very promising approach for microstructure fabrication. In this work, the morphology of grid lines deposited by LIFT was investigated. A characterization scheme for solar cell grid lines was proposed. The shape of grid lines was described, combined with confocal imaging. The evolution process of grid lines from no forming to single-peak and double-peak with a variation of laser fluence was observed. According to experimental conditions, different types of grid line morphology were obtained and transfer mechanisms of silver paste were proposed based on fluid dynamics. The influence of laser fluence on the morphology of formed grid lines was explained through phenomenology and analysis. This can provide a guide for morphology control in forming the process of grid lines

一种适用于储能驱动薄型折叠机翼的锁定机构

本申请涉及一种适用于储能驱动薄型折叠机翼的锁定机构,其包括转动连接的内翼和外翼,所述锁定机构用以控制所述外翼展开以及折叠后的锁定,所述锁定机构包括：连杆滑块机构,在外翼的展开与折叠过程中产生联动动作；开关机构,用以控制连杆滑块机构的锁定；开锁电机机构,用以控制开关机构解除对连杆滑块机构的锁定；其中,连杆滑块机构、开关机构、开锁电机机构的动作方向皆与航向相错开。本申请具有使得折叠机翼的折叠状态的锁定以及解锁稳定,减少松脱和卡死状态的发生的效果

一种不改变气动外形的折叠机翼分离面设计方法

本发明属于航空航天飞行器折叠机翼结构技术领域,公开了一种不改变气动外形的折叠机翼分离面设计方法,该方法包括：在机翼上下表面各自锯齿型交线的对称轴向段之间建立轴向分离面交线,该轴向分离面交线是基于折叠机翼分离面轴向分离定理和推论设计出的交线,可使外翼绕内翼向下转动时不发生干涉；还包括横向分离面和轴向分离面,所述的轴向子分离面为采用所述轴向分离面交线与锯齿型交线生成的可使得外翼绕转轴顺时针转动时内外翼不发生干涉的曲面；本发明方法设计的分离面无需机翼上下表面的外形,即不改变气动外形,且在折叠机翼展开状态内外翼之间没有间隙,可以避免机翼下方气流渗流到上方,造成升力损失