新形金纳米片的简单制备与生长机制
在室温(-30℃)条件下,氯金酸(HAuCl4)均匀混合在粘稠的表面活性剂聚乙烯吡咯烷酮(PVP)胶体(水为溶剂)中,HAuCl4可以被PVP还原,从而形成纳米片.本工作中,通过调整晶体生长条件,成功合成了大量新形貌的单晶金纳米片(厚度数十纳米,尺寸为数个微米).例如,在晶体生长初期阶段,通过引入温度变化(如降温10—20℃),形成的金纳米片主要是六角星形,并伴有盾状、内凹外凸的三角状、截角的、三又的及多台阶等新形纳米片.结合理论计算,阐明了金纳米片的生长机制:在一定条件下,金(111)晶面不仅可以沿着〈110〉方向生长成为常规的三角或六角纳米片,还可以沿〈211〉、〈321〉等不同方向生长成...
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| Published in | 物理化学学报 Vol. 30; no. 1; pp. 194 - 204 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
南京航空航天大学理学院应用物理系,南京,211106%南京航空航天大学理学院应用物理系,南京211106
2014
南京航空航天大学,纳智能材料器件教育部重点实验室,南京211106 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-6818 |
| DOI | 10.3866/PKU.WHXB201311053 |
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| Summary: | 在室温(-30℃)条件下,氯金酸(HAuCl4)均匀混合在粘稠的表面活性剂聚乙烯吡咯烷酮(PVP)胶体(水为溶剂)中,HAuCl4可以被PVP还原,从而形成纳米片.本工作中,通过调整晶体生长条件,成功合成了大量新形貌的单晶金纳米片(厚度数十纳米,尺寸为数个微米).例如,在晶体生长初期阶段,通过引入温度变化(如降温10—20℃),形成的金纳米片主要是六角星形,并伴有盾状、内凹外凸的三角状、截角的、三又的及多台阶等新形纳米片.结合理论计算,阐明了金纳米片的生长机制:在一定条件下,金(111)晶面不仅可以沿着〈110〉方向生长成为常规的三角或六角纳米片,还可以沿〈211〉、〈321〉等不同方向生长成含有更高指数侧面的新形金纳米片. |
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| Bibliography: | Gold nanoplate; Poly-vinylpyrrolidone; Star-likeshape; Growth mechanism;High-index facet 11-1892/06 When a sticky gel consisting of an aqueous HAuCI4 solution mixed with poly-vinylpyrrolidone (PVP) surfactant is kept at room temperature (about 30 ℃), the HAuCI4 is reduced by the PVP, resulting in the formation of nanostructures. In this study, gold nanoplates with new shapes, which were single crystalline, several micrometers wide, and tens of nanometers thick, were mass-synthesized by adjusting the crystal growth conditions. For example, through inducing temperature decrease (10-20 ℃)in the early stage of crystal growth, the product is dominated by star-like gold nanoplates, together with other new shapes such as shields, concave and convex triangles, corner snipped shapes, triple branched shapes, and shapes that are step-rich in the side plane. Based on theoretical calculations, we present the growth mechanism of these new gold nanoplates. Under certain growth conditions, the (111) plane of the gold crystal c |
| ISSN: | 1000-6818 |
| DOI: | 10.3866/PKU.WHXB201311053 |