三聚苯撑乙烯/蒙脱土发光光谱的时间依赖性

Deposited Time Dependence of Luminescence Spectra of Trimeric Phenylenevinylene/Montmorillonite

用原位插层法制备了插层型的三聚苯撑乙烯/蒙脱土(TPV/MMT)纳米复合材料.研究了新制备及在室温储存180天后的TPV/MMT纳米复合材料的荧光光谱及蒙脱土层间距的变化情况.荧光光谱分析表明,储存180天后,TPV/MMT纳米复合材料的最大发射峰由494 nm蓝移到438 nm,半峰宽由77 nm增加到104nm.X射线衍射结果表明,与新制备的复合材料相比,蒙脱土的层间距由1.52 nm减小到1.22 nm.红外光谱分析表明,室温储存180天后的三聚苯撑乙烯苯环的某些特征峰由1598和1554 cm-1分别红移到1506和1462 cm-1.依据相关实验和理论数据探讨了储存180天前后TPV在蒙脱土中聚集态结构的变化方式.

The incorporation of trimeric phenylenevinylene （TPV） into the interlayer space of montmorillonite （MMT） was performed by an in-situ intercalation method. Effects of storage time on the photoluminescence spectra of TPV/MMT were studied. Photoluminescence analysis of the TPV/MMT composite indicated that the maximal emission band changed from 494 nm （the as-prepared sample） to 438 nm （the sample deposited at room temperature for 180 days）. The intrinsic gallery of MMT decreased from 1.52 to 1.22 nm as the storage time increased as shown in X-ray diffraction （XRD） patterns. In IR spectra of TPV/MMT the two bands of the aromatic ring （at 1598 and 1554 cm^-1） shifted to lower wavenumbers （at 1506 and 1462 cm^-1）, respectively, after preservation at room temperature for 180 days. The variational aggregation of the TPV molecule in MMT is discussed according to theoretical and experimental data.