PTCDA一维纳米结构的制备及其光学性能的调变
Preparation of PTCDA one-dimensional nanostructures and modulation of their optical properties
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摘要: 在分子束外延系统（MBE）中以玻璃为衬底,使用物理气相沉积（PVD）方法制备了苝四甲酸二酐（PTCDA）的纳米结构;并利用扫描/透射电子显微镜（SEM/TEM）, X射线衍射（XRD）,紫外-可见分光光度计（UV-vis）和荧光谱仪（PL）等手段对样品的形貌及光学性能进行了系统的研究.结果表明,纳米结构的形貌主要受衬底温度（Ts）的影响;单晶 PTCDA纳米棒和纳米线的形成机制是基于VS（vapor-solid）机理.此外, XRD结果表明制备的纳米结构均为α相PTCDA.然而, 纳米结构的尺寸和结晶度的不同,导致了它们光学性能的差异.Abstract: 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) nanostructures were prepared on glass substrate in a molecular beam epitaxy (MBE) system via physical vapor deposition (PVD) method. Scanning/transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), ultraviolet visible absorption spectra (UV-vis) and photoluminescence emission (PL) techniques were applied for the systematic characterizations of the morphologies and optical properties of those nanostructures. It was found that the morphologies of PTCDA nanostructures were mainly affected by substrate temperature (Ts) and the formation of single crystalline PTCDA nanorods and nanowires were correlated well with the traditional vapor-solid (VS) nucleation mechanism. XRD study indicated that only the α-PTCDA was formed regardless of the Ts. However, differences in size and crystallinity of the nanostructures caused a subsequent change in their optical properties.
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