Formation of high-yield gold nanoplates on the surface: Effective two-dimensional crystal growth of nanoseed in the presence of poly(vinylpyrrolidone) and cetyltrimethylammonium bromide
Formation of high-yield gold nanoplates on the surface: Effective two-dimensional crystal growth of nanoseed in the presence of poly(vinylpyrrolidone) and cetyltrimethylammonium bromide
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DOI：
10.1021/cg900109x
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发表时间：
2009-04
影响因子：
3.8
通讯作者：
A. Umar;M. Oyama;M. Salleh;B. Majlis
中科院分区：
文献类型：
--
作者：
A. Umar;M. Oyama;M. Salleh;B. Majlis
本文报道了一种简单的方法，即在聚乙烯吡咯烷酮(PVP)和十六烷基三甲基溴化铵(CTAB)的二元表面活性剂的存在下，通过有效地促进附着的纳米种子的二维生长，在表面直接生长出高产量的金纳米板。金纳米片的形成强烈依赖于溶液中PVP的浓度，而纳米片的大小则取决于CTAB的浓度。在具有最佳PVP和CTAB浓度的典型工艺中，60%的纳米晶产物为纳米片状。研究发现，三角形纳米板是纳米板的主要形状，其产率高达约50%，而六角形或截断六角形和圆形纳米板分别占纳米板产品的30%和20%。纳米板具有厚度小于10 nm的非常薄的结构。在最佳的生长条件下，约70%的纳米板的边长可达1μm。
This paper reports a simple technique to grow high-yield gold nanoplates directly on the surface via an effective two-dimensional growth promotion of the attached nanoseeds in the presence of a binary surfactant mixture, namely, poly(vinylpyrrolidone) (PVP) and cetyltrimethylammonium bromide (CTAB). The gold nanoplates formation strongly depended on the concentration of PVP used in the solution, while the nanoplate size depended on the CTAB concentration. In a typical process with optimum PVP and CTAB concentrations, 60% of the nanocrystal product was nanoplates. Triangular nanoplates were found to be the major shape of the nanoplates with a yield of up to ca. 50%, while hexagonal or truncated-hexagonal and rounded-nanoplates shared up to ca. 30 and 20% of the nanoplates product, respectively. The nanoplates were characterized by a very thin structure with a thickness of less than 10 nm. The edge-length size of the nanoplates was found to be up to ca. 1 μm. At optimum growth conditions, ca. 70% of the sur...