三角形纳米银片合成及其性能表征

在适量的二异辛基磺化琥珀酸钠和柠檬酸钠表面修饰剂存在下,采用硼氢化钠还原硝酸银,在一定的水浴条件下合成出高产率的形貌规则的三角形纳米银片.透射电子显微镜、高分辨透射电子显微镜、原子力显微镜和X射线衍射仪表征表明,银纳米片是具有整齐的原子排列的良好单晶体.紫外-可见一近红外分光光度计表征表明,纳米银三角形片的面内偶极共振峰可达约1230 nm的近红外波段.这种特殊的光谱学特征使得三角形纳米银片在光热触发释放药物、红外吸收及光纤等领域具有重要的用途.研究结果表明,只有在一定的二异辛基磺化琥珀酸钠浓度、反应时间及pH值条件下才能够获得高产率、形貌规则的三角形纳米银片.根据对三角形纳米银片生长过程的显微镜结构表征提出了以三角形框形成为框架的纳米三角形融合生长机制.

Synthesis of Triangular Silver Nanoplates and Their Properties Characterization

The large-scale regular silver triangular nanoplates were synthesized by the reduction of silver nitrate with sodium borohydride in the presence of sodium citrate and dioctyl sulfosuccinate sodium salt (AOT) and in the water bath.The morphologies of silver triangular nanoplates were studied by transmission electron microscopy,high resolution transmission electron microscopy and atomic force microscopy and X-ray diffraction.The optical properties were studied by UV-visible-infrared photospectrometery.The results confirm that the silver nanoplates are the single crystallinity with regular arrangement of atoms.The optical in-plane dipole plasmon band of the silver nanoplate has been extended to about 1230 nm,which is in the near-infrared (NIR) regime.Studies from different AOT concentrations,pH values and reaction time demonstrate that triangular nanoframe-mediated growth mechanism is supported only in the proper experimental conditions.