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

作　　者：郭盼盼[1] 韩玉岩[2] 张文华[1] 刘凌云[1] 徐法强[1] 

机构地区：[1]中国科学技术大学国家同步辐射实验室,安徽合肥230029 [2]中国科学院合肥强磁场科学中心,安徽合肥230031

出　　处：《中国科学技术大学学报》2014年第12期996-1000,1006,共6页JUSTC

基　　金：国家自然科学基金(U1232137)资助

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.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 theα-PTCDA was formed regardless of the Ts.However,differences in size and crystallinity of the nanostructures causedasubsequent change in their optical properties.

关 键 词：有机单晶 VS PVD PTCDA 衬底温度 光学性能 

分 类 号：O782.7[理学—晶体学]