氧离子束辅助激光淀积生长ZnO/Si的研究

利用 X 射线衍射(XRD),X 射线摇摆曲线(XRC)和 X 射线光电子能谱(XPS)分析方法对氧离子束辅助激光淀积生长的 ZnO/Si 异质结薄膜进行了分析。结果表明:用该法可生长出高度 c 轴单一取向 ZnO 薄膜,XRC 的半高宽度(FWHM)仅为2.918°。表明此生长方法经优化,可生长出单晶质量很好的 ZnO/Si 薄膜。

Influence Factors on Particle Growth for On-line Aerosol Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry

An evaporation/condensation flow cell was developed and interfaced with the matrix-assisted laser desorption/ionization （MALDI） time-of-flight mass spectrometer for on-line bioaerosol detection and characterization, which allows matrix addition by condensation onto the laboratory-generated bioaerosol particles. The final coated particle exiting from the con- denser is then introduced into the aerodynamic particle sizer spectrometer or home-built aerosol laser time-of-flight mass spectrometer, and its aerodynamic size directly effects on the matrix-to-analyte molar ratio, which is very important for MALDI technique. In order to observe the protonated analyte molecular ion, and then determine the classification of bi- ological aerosols, the matrix-to-analyte molar ratio must be appropriate. Four experimental parameters, including the temperature of the heated reservoir, the initial particle size, its number concentration, and the matrix material, were tested experimentally to analyze their influences on the final particle size. This technique represents an on-line system of detection that has the potential to provide rapid and reliable identification of airborne biological aerosols.

光谱及其空间调控下的纳米结构材料合成技术研究

由于激光能够提供多变且独特的能量源,因此在精确控制材料生长与成形方面有独到优势,并得到了广泛的工业应用。主要介绍了空气中利用光谱及空间技术调控激光物质相互作用,实现纳米结构功能材料的制造。主要包括:金刚石薄膜和晶体的快速生长,碳纳米管的自校准生长,在绝缘体表面直接形成石墨烯薄膜层,碳纳米洋葱的合成及其在能量存储和摩擦力学中的应用,以及使用激光辅助光谱和质谱分析法进行核分析鉴定等方向的科研成果。最后介绍了前体分子的震动模式在材料合成中起到关键作用这一新的科研发现,由此推断出温度并非是化学热催化过程的唯一参数。