CAJ | 학술논문

以1,3-二苯基-2-吡唑啉(DP)为目标化合物,利用再沉淀方法,以混合溶剂作为不良溶剂,制备了形貌均一,宽度约2 μm、厚度200 nm和长度数十微米的一维纳米带状结构.选区电子衍射结果证实,DP分子在纳米带中因为强的分子间π-π相互作用而沿着晶体[100]方向优势生长.稳态光谱结果表明,DP纳米带具有不同于分子和体相材料的介观特性.由于J-聚体在DP纳米带中优势形成,其480 nm的发射峰与分子和体相材料相比分别红移了30和20 nm.利用扫描近场光学显微镜进一步发现,一维DP纳米带类似于天然的亚波长尺度谐振腔,紫外激发DP分子发射的荧光被限域在DP纳米带中,沿一维方向传导并在两端耦合输出.
이1,3-이분기-2-필서람(DP)위목표화합물,이용재침정방법,이혼합용제작위불량용제,제비료형모균일,관도약2 μm、후도200 nm화장도수십미미적일유납미대상결구.선구전자연사결과증실,DP분자재납미대중인위강적분자간π-π상호작용이연착정체[100]방향우세생장.은태광보결과표명,DP납미대구유불동우분자화체상재료적개관특성.유우J-취체재DP납미대중우세형성,기480 nm적발사봉여분자화체상재료상비분별홍이료30화20 nm.이용소묘근장광학현미경진일보발현,일유DP납미대유사우천연적아파장척도해진강,자외격발DP분자발사적형광피한역재DP납미대중,연일유방향전도병재량단우합수출.
1D single-crystalline 1,3-diphenyl-2-pyrazoline(DP) nanobelts were prepared by the modified repercipication method with mixed poor solvents. The thickness of DP belt can be controlled at 200 nm with the width at 2 μm and the length at tens of microns. XRD and SAED indicate that the DP nanobelt grow along the [100]direction due to the π-π stacking of DP molecule. The steady-state absorption and fluorescence spectra indicate that DP nanobelts have unique optical properties which are different from the monomers and the bulk crystals. Furthermore, we find the belts are able to absorb the excitation light and propagate the PL emission towards the tips. The results presented in this paper provide useful information for the design and fabrication of optical waveguides from molecular materials.