基于弛豫铁电单晶的热释电焦平面研究

PMN-PT是一种综合性能优异的新型热释电材料.本文以PMN-PT单晶作为热释电探测器材料,开展了8×1线列探测器的芯片结构设计及器件关键工艺研究,获得了8元热释电探测器芯片,电压响应率约280N/W.同时,实现了8元热释电光敏芯片与8元读出电路的耦合互连,得到了8元热释电焦平面原型器件,并进行了性能测试.由于读出电路...     

Single Crystal Fe Nanowire Arrays Encapsulated by SiO2 Nanotubes

Aligned silicon dioxide nanotubes with diameter of 60-70 nm were synthesized inside the nanoholes of an anodic AI membrane (AAM) template by pressure impregnating the AAM pores with the SiO_2 sol. The Si0_2 nanotubes with different wall thickness were produced by repeating the process. Using the second-order template of porous AAM with silicon dioxide nanotubes, it was fabricated the nanostructure of Fe nanowires encapsulated by SiO_2 nanotubes by electrochemical deposition. Scanning electron microscope (SEM) and transmission electron microscope (TEM) observations show that the nanotubes and nanocables are compact, continuous and uniform. Selected area electron diffraction (SAED) pattern shows the Fe nanowire is a single crystal. The magnetic properties of these samples were checked by a vibrating sample magnetometer (VSM). The coercivities of the samples are greatly improved compared to the corresponding bulk materials.     

SmB6单晶纳米结构的可控制备及场发射特性研究

作为一种典型的近藤拓扑绝缘体, 近年来六硼化钐(SmB₆)材料受到了凝聚态物理和材料科学领域研究者的广泛关注。与块体材料相比, SmB₆纳米材料由于具有更大的比表面积而拥有更为丰富的表面电子态, 因此被认为是一个研究表面量子效应和物理机制的理想平台。由于场发射电流主要来源于纳米材料的表面态, 所以研究SmB₆纳米材料的场发射特性可以为研究其表面量子特性提供有益的参考。本研究利用化学气相沉积法, 通过控制实验条件在硅衬底上分别实现了SmB₆纳米带和纳米线薄膜的生长。研究结果表明: 所制备的SmB₆纳米线和纳米带分别为沿着[100]和[110]方向生长的立方单晶结构。场发射特性的测试结果发现: SmB₆纳米带薄膜的开启电场为3.24 V/μm, 最大电流密度达到了466.16 μA/cm ², 其场发射性能要优于纳米线薄膜。同时考虑到SmB₆拥有很低的电子亲和势、高电导率和丰富的表面电子态, 所以若可以进一步提高其场发射特性, 那么很可能在冷阴极电子源领域有潜在应用。