Interparticle spacing control in the superlattices of carboxylic acid-capped gold nanoparticles by hydrogen-bonding mediation.
Interparticle spacing control in the superlattices of carboxylic acid-capped gold nanoparticles by hydrogen-bonding mediation.
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DOI：
10.1021/la0481501
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发表时间：
2004-10
期刊：
影响因子：
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通讯作者：
H. Yao;H. Kojima;Seiichi Sato;K. Kimura
中科院分区：
文献类型：
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作者：
H. Yao;H. Kojima;Seiichi Sato;K. Kimura
我们已经证明，羧酸封端的金纳米粒子自组装形成二维（2D）和/或三维（3D）的超晶格在空气/水界面的存在下的双功能氢键介体，如4-吡啶羧酸（PyC）或反式-3-（3-吡啶基）丙烯酸（PyA）。透射电子显微镜显示，在超晶格中的纳米粒子的六方密堆积排列与粒子间的间距的扩展。在2D超晶格中，较大的粒子产生具有长程平移有序的较高质量的组装。衰减全反射红外光谱（ATR-IR）揭示了纳米粒子表面上的羧酸的介体和封端剂之间的氢键的存在。由于实验获得的粒子间的分离距离与几何模型计算得到的近似一致，我们得出结论，氢键调解控制超晶格中相邻纳米粒子之间的单分子掺入的粒子间的间距或结构。
We have demonstrated that carboxylic acid-capped gold nanoparticles were self-assembled to form two-dimensional (2D) and/or three-dimensional (3D) superlattices at an air/water interface in the presence of a bifunctional hydrogen-bonding mediator such as 4-pyridinecarboxylic acid (PyC) or trans-3-(3-pyridyl)acrylic acid (PyA). Transmission electron microscopy revealed a hexagonal close-packed arrangement of nanoparticles in the superlattice with an extension of interparticle spacing. In the 2D superlattices, larger particles produced a higher-quality assembly having long-range translational ordering. Attenuated total reflectance IR (ATR-IR) spectroscopy revealed the presence of hydrogen bonds between the mediator used and the capping agents of carboxylic acid on nanoparticle surfaces. Since the experimentally obtained interparticle separation distance agreed approximately with that obtained by the geometrical model calculations, we conclude that the hydrogen-bonding mediation controlled the interparticle spacing or structure by monomolecular incorporation between adjacent nanoparticles in the superlattices.