Self-assembling of gold nanoparticles in one, two, and three dimensions
Self-assembling of gold nanoparticles in one, two, and three dimensions
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DOI：
10.1007/s003390000522
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发表时间：
2000-09-01
影响因子：
2.7
通讯作者：
José-Yacamán, M
中科院分区：
文献类型：
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作者：
Gutiérrez-Wing, C;Santiago, P;José-Yacamán, M
在目前的工作中，我们报道了在甲苯蒸气中用正烷基硫醇分子结晶钝化的有序金纳米颗粒阵列的生长。我们保持钝化分子(1-十二硫醇)的平均粒径和长度不变。生长的温度和时间是不同的。我们发现在生长的初始阶段，会产生纳米级的颗粒链。这些纳米链聚集在一起形成二维阵列。在初始阶段，纳米链形成二维正方形晶格，然后松弛为紧密堆积的结构。在生长的后期，会产生三维超晶。研究发现，纳米颗粒的堆积对应于平均的面心立方晶格。然而，在超晶边缘附近观察到晶格的局域参数有很大的变化，这是由Zanchet等人报道的反常堆积。[20]和Fink等人。[21]被观察到。用分子动力学模拟方法对观察到的结构进行了能量分析。结果表明，用气相生长方法可以得到一维到三维的可控有序结构。
In the present work, we report the growth of ordered arrays of gold nanoparticles passivated with n-alkylthiol molecules using crystallization in toluene vapor. We kept constant the average particle size and the length of the passivating molecule (1-dodecanethiol). The temperature and time of growth were varied. We show that in the initial stages of the growth, nano-chains of particles are produced. These nano-chains aggregate to form two-dimensional arrays. In the initial stages the nano-chains form a two-dimensional square lattice which then relaxes to a close-packed structure. In latter stages of growth a three-dimensional supercrystal is produced. It is found that the packing of nanoparticles corresponds to an average FCC lattice. However, large variations on the local parameters of the lattice are observed, Near the edges of the supercrystal the anomalous packing reported by Zanchet et al. [20] and Fink et al. [21] was observed. The energy of the observed structures is analyzed using molecular dynamics simulation. It is concluded that using the vapor growth method, it is possible to produce controlled ordered structures from one to three dimensions.