壳聚糖介质金纳米盘的可控合成及生长机理

水浴加热氯金酸、壳聚糖和纳米金种子的混合液,以壳聚糖为稳定剂和还原剂成功合成了表面等离子体共振(SPR)吸收峰位可调的金纳米盘.SEM电镜图像表明纳米金盘主要为三角形和截角三角形,其边长在170 nm左右.X射线衍射分析表明金纳米盘是以{111}面为盘状面的高纯金单晶.讨论了金纳米盘的生长机理.在最佳条件下金纳米盘的面内偶极等离子共振吸收峰位于920 nm.实验结果表明通过控制壳聚糖的量、金种子的加入量、水浴温度及水浴时间可以有效地控制近红外等离子吸收峰位及吸收强度.

Controllable Synthesis of Chitosan-Mediated Gold Nanoplate and the Growth Mechanisms

By chitosan as a stabilizer and reducing agent,the tunable surface plasmon resonance(SPR) absorption peak of gold nanoplate has been successfully fabricated by water bath heating of solution containing HAuCl4,chitosan and gold nanoseeds.The SEM images indicated that the gold nanoplates were mainly composed of triangular and truncated triangular shape.The edge is about 170 nm.X-ray diffraction analyses indicated that the gold nameplates were pure single crystals with {111} planes as their basal planes.The growth mechanisms on synthesis of chitosan-mediated gold nanoplate were discussed.Under optimum conditions the SPR absorption peak of gold nanoplate in-plane dipolar is 920 nm.The experiment results showed that the near-infrared SPR absorption peak and the absorption intensity can be effectively controlled by controlling the amounts of chitosan and gold seeds,water bath temperature and bath time.