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1.
郭泽堃  田颜  甘海波  黎子娟  张彤  许宁生  陈军  陈焕君  邓少芝  刘飞 《物理学报》2017,66(21):217702-217702
随着石墨烯研究的兴起,二维纳米材料得以迅速发展.在众多的二维纳米材料中,硼烯和碱土金属硼化物二维材料由于具有高费米速度、高杨氏模量、高透光性、高延展性、高度的各向异性、大的泊松比和高的化学稳定性等独特的性质,成为研究人员关注的焦点.本文侧重介绍目前硼烯和碱土金属硼化物二维纳米材料的制备工艺、结构、物性和应用情况.首先总结了目前硼烯的主要结构构型和制备及掺杂工艺;其次介绍了碱土金属硼化物二维纳米材料的理论结构构型和可能的制备路线;最后对硼烯和二维碱土金属硼化物纳米材料的物理特性进行归纳总结,同时预测它们未来最可能实现应用的领域.  相似文献   
2.
<正>The controllable growth of three different morphologies of AlN nanostructures(nanorod,nanotip and nanocrater) arrays are successfully realized by using chemical vapour deposition(CVD) technology.All three nanostructures are of single crystal h-AlN with a growth orientation of[001].Their growth is attributed to the vapour-liquid-solid(VLS) mechanism.To investigate the factors affecting field emission(FE) properties of AlN nanostructures,we compare their FE behaviours in several aspects.Experimental results show that AlN nanocrater arrays possess the best FE properties, such as a threshold field of 7.2 V/μm and an emission current fluctuation lower than 4%.Moreover,the three AlN nanostructures all have good field emission properties compared with a number of other excellent cathode nanomaterials, which suggests that they are future promising FE nanomaterials.  相似文献   
3.
针对碳纳米管场致发射冷阴极在微波、毫米波电真空辐射源器件中的应用需求,采用2μs,20 kV的脉冲高压对碳纳米管场致发射冷阴极的脉冲发射特性进行了实验研究.通过改变阴阳极间距,对碳纳米管冷阴极发射电流特性及发生脉冲高压打火后的碳纳米管冷阴极发射特性进行了测试研究.在直径为4 mm的圆形平面碳纳米管冷阴极上获得最大发射电流16 mA,电流密度为127 mA/cm~2.以实验测试数据为基础,结合粒子模拟软件建立碳纳米管冷阴极场致发射仿真模型,给出了该仿真模型的相关参数,为下一步设计研制碳纳米管冷阴极电子光学系统及相关辐射源器件奠定基础.  相似文献   
4.
三氧化钨是具有多功能的宽带隙半导体材料,它表现出许多独特的性质,具有广阔的应用前景,成为目前纳米材料的一个研究热点.三氧化钨有显著的电致变色、气致变色、热致变色、光致变色的特性,它们可以用来做成平板显示器[1]、灵巧窗口[2]、温湿度传感器[3]等等.此外,一些氧化钨低值氧化物(WO3-x)还有很好的电特性,尤其表现在超导及电荷输运能力方面[4].本文利用光电子能谱技术,对三氧化钨纳米线的还原进行深入细致的分析,力图阐明其还原所经历的复杂过程.  相似文献   
5.
飞秒激光的波长对SiC材料烧蚀的影响   总被引:10,自引:0,他引:10  
利用10倍的显微物镜将近红外飞秒激光脉冲汇聚到宽带隙半导体材料6H SiC的前表面,研究样品的烧蚀及诱导微细结构。用扫描电镜(Scanning electron microscope,SEM)及光学显微镜测量烧蚀斑。利用烧蚀面积与激光脉冲能量的关系确定SiC的烧蚀阈值。给出了SiC样品的烧蚀阈值与飞秒激光波长的依赖关系。实验结果表明,可见光区随波长增加,烧蚀阈值从0.29J/cm2增加到0.67J/cm2;而在近红外区,SiC的烧蚀阈值为0.70J/cm2左右,基本上不随激光波长变化而改变。结合计算结果,可以认为在飞秒激光烧蚀SiC的过程中,在近红外区,光致电离和碰撞电离均起到了重要的作用;而在可见光区,光致电离的作用相对大一些。  相似文献   
6.
All-solid-state strong coupling systems with large vacuum Rabi splitting energy have great potential applications in future quantum information technologies, such as quantum manipulations, quantum information storage and processing,and ultrafast optical switches. Monolayer transition metal dichalcogenides(TMDs) have recently been explored as excellent candidates for the observation of solid-state strong coupling phenomena. In this work, from both experimental and theoretical aspects, we explored the strong coupling effect by integrating an individual plasmonic gold nanorod into the monolayer tungsten diselenide(WSe_2). Evident anti-crossing behavior was observed from the coupled energy diagram at room temperature; a Rabi splitting energy of 98 meV was extracted.  相似文献   
7.
刘飞  莫富尧  李力  苏赞加  黄泽强  邓少芝  陈军  许宁生 《中国物理 B》2010,19(10):107205-107205
The AlN nanostructures with a wide band-gap of 6.28 eV are considered as ideal cold cathode materials because of their low electron-affinity. Many methods have been devoted to fabricating AlN nanostructures, but high growth temperature over 800°C and the use of the catalysts in most methods limit their practical application and result in their poor field-emission behaviours in uniformity. This paper reports that without any catalysts, a simple chemical vapour deposition method is used to synthesize aligned AlN nanocone arrays at 550°C on silicon substrate or indium tin oxide glass. Field emission measurements show that these nanocones prepared at low temperature have an average turn-on field of 6 V/μm and a threshold field of 11.7 V/μm as well as stable emission behaviours at high field, which suggests that they have promising applications in field emission area.  相似文献   
8.
Cubic silicon carbide (SiC) nanowires are synthesized in a catalyst-assisted process. The nanowires with diameter of - 40 nm exhibit strong blue light emission at room temperature under ultraviolet (UV) femtosecond laser excitation. The photon energy of peak emission is higher than the energy bandgap of cubic SiC which shows involvement of quantum confinement effect. The ultrafast fluorescence is deconvoluted by Monte-Carlo method. The results show two ultrafast decay processes whose lifetimes are about 26 and 567 ps respectively. The mechanisms of such ultrafast processes are discussed.  相似文献   
9.
陈尚辉  陈建  邓少芝  许宁生 《中国物理 B》2010,19(3):37803-037803
Nanodevices using the photovoltaic effect of a single nanowire have attracted growing interest.In this paper,we consider potential applications of the photovoltaic effect to optical signal coupling and optical power transmission,and report on the realization of a heterojunction formed between WO 2 and WO 3 in a fine-wire having a diameter on the micrometer scale.Using a laser beam of 514.5 nm as a signal source,the WO 2-WO 3 heterojunction yields a maximum output power of up to 37.4 pico watt per heterojunction.Fast responses(less than a second) of both photovoltaic voltage and current are also observed.In addition,we demonstrate that it is a simple and effective way to adapt a commercial Raman spectrometer for the combined functions of fabrication,material characterization and photovoltaic measurement of an optical signal coupler and optical power transmitter based on a fine-wire.Our results show an attractive perspective of developing nanowire or fine-wire elements for coupling optical signals into and for powering a nanoelectronic or nano-optoelectronic integrated circuit that works under the condition of preventing it from directly electrically connecting with the optical coupler.  相似文献   
10.
ZnqCl2薄膜与器件的制备及其光电特性   总被引:4,自引:3,他引:1  
用热蒸发技术成功地制备了新合成的二氯取代的八羟基喹啉锌(ZnqCl2)薄膜,并制作成有机发光嚣件。紫外吸收谱分析表明,器件在225,290,350,392.5nm处有4个吸收峰。光致发光和电致发光研究衰明,ZnqCl2薄膜有良好的发光特性,器件的发光亮度大。并分析了ZnqCl2薄膜的能级结构。  相似文献   
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