Facile Route to Control over the Morphological Evolution of β-Ga_2O_3 from Nanowires to Nanoflags and to Nanosheets

We report the fabrication of β-Ga_2O_3 nanostructures on Au-coated(0001) sapphire substrate by chemical vapor deposition. The morphologies and structural properties of β-Ga_2O_3 nanostructures were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. Different morphologies including nanowire, nanoflag and nanosheet were controllably synthesized by adjusting the important growth parameters of ambient source contents. It is suggested that the relative ratio of oxygen and gallium contents plays a significant role in determining the morphologies of β-Ga_2O_3 nanostructure.

在蓝宝石衬底上外延生长ZnGa2O4纳米线及其表征

使用一种简单的化学气相沉积法成功地在c面蓝宝石衬底上外延生长了整齐排列的ZnGa2O4单晶纳米线。研究了在不同生长温度和生长压力下外延生长ZnGa2O4纳米线,并使用XRD,SEM和TEM对产物进行了表征。结果表明,在生长条件为980℃和100Torr时,可以外延生长出整齐排列的ZnGa2O4纳米线。所制备的ZnGa2O4纳米线直径为60~150nm,并遵循Au催化的VLS生长机制沿其四个结晶学方向在蓝宝石上外延生长。分析了纳米线沿四个方向生长的原因,并对纳米线的光致发光性能进行了探讨。

特战青年军官队员1km扛圆木跑的生理生化指标分析

为提高1 km扛圆木跑训练的科学性,采用运动人体科学的研究方法,对部分联训学员训练过程中的一些生理生化指标进行了监测。研究表明:1 km扛圆木跑是一项非常好的极限强度训练方式,其高强度的无氧训练不仅能提高学员的速度能力和速度储备,而且也能提高学员的抗乳酸能力,对于提高其负重奔袭能力具有较高的价值和意义。