Yan Dongpeng, Lu Jun, Wei Min, Li Shuangde, Evans David G, Duan Xue
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
Phys Chem Chem Phys. 2012 Jun 28;14(24):8591-8. doi: 10.1039/c2cp40350a. Epub 2012 Apr 10.
Ordered ultrathin films (UTFs) with blue luminescence based on a styrylbiphenyl derivative (BTBS) and Mg-Al-layered double hydroxide (LDH) nanosheets have been constructed employing the layer-by-layer assembly technique. UV-visible absorption and fluorescence spectroscopy showed a stepwise and regular growth of the films upon increasing the number of deposition cycles. XRD, AFM and SEM indicated that the films possess a periodic layered structure with a period of ca. 1.5 nm, and uniform surface morphology. The film thickness can be precisely controlled in the range ca. 15-53 nm. The BTBS-LDH UTFs exhibit improved UV-light resistance capability compared with the pristine BTBS and show well-defined polarized photoemission, with anisotropy of ca. 0.24. The UTFs show a fast, selective and reversible luminescent response to aqueous solutions containing different heavy metal ions, with the most significant luminescent quenching occurring for the Hg(2+) solution, shedding light on the fact that these films can serve as a new type of selective solid luminescent metal-ion sensor.
基于苯乙烯基联苯衍生物（BTBS）和镁铝层状双氢氧化物（LDH）纳米片，采用逐层组装技术构建了具有蓝色发光的有序超薄膜（UTFs）。紫外可见吸收光谱和荧光光谱表明，随着沉积循环次数的增加，薄膜呈逐步且规则的生长。X射线衍射（XRD）、原子力显微镜（AFM）和扫描电子显微镜（SEM）表明，这些薄膜具有周期约为1.5 nm的周期性层状结构以及均匀的表面形貌。薄膜厚度可在约15 - 53 nm范围内精确控制。与原始BTBS相比，BTBS-LDH UTFs表现出更高的抗紫外光能力，并且呈现出明确的偏振光发射，各向异性约为0.24。这些UTFs对含有不同重金属离子的水溶液表现出快速、选择性和可逆的发光响应，其中Hg(2+)溶液导致的发光猝灭最为显著，这表明这些薄膜可作为一种新型的选择性固体发光金属离子传感器。
