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Self-assembly and optical properties of resorcinarene encapsulated gold nanoparticles.

机译：间苯二甲烯包封的金纳米粒子的自组装和光学性质。

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Resorcinarenes are excellent surfactants for enhancing the dispersion and self-assembly gold nanoparticles. Tetrathiol cavitands such as 8 and 13 enhance the dispersion and robustness of midnanometer-sized gold particles suspended in organic solvents. Tetra-C-thiomethyl cavitand 13 is a superior dispersant over tetra-C-thiol cavitand 8 under the conditions examined. However, cavitand 8 provides excellent dispersion control of gold nanoparticles at the air-water interface and enables their spontaneous organization into two-dimensional arrays. In addition, we have studied the self-assembly of resorcinarene-encapsulated gold nanoparticles as a function of surface charge and surfactant structure. The degree of monolayer formation and 2D order within the self-assembled nanoparticle arrays is strongly influenced by the amount and type of electrolyte (chloride and/or citrate) adsorbed on the nanoparticle surface. Resorcinarenes with strongly chemisorptive headgroups promote the self-assembly of 2D arrays.; The gold nanoparticle arrays exhibit size-dependent extinction maxima which shift toward near-infrared wavelengths with increasing periodicity. Surface-enhanced Raman scattering (SERS) also varies greatly as a function of periodicity and incident wavelength, with empirical enhancement factors (G) ranging from 104 to over 107. The majority of the enhanced Raman scattering is most likely produced by localized field effects in the crevices and cavities of the arrays, whose depths and aspect ratios can be tuned by changing the unit particle size. The resorcinarene-coated gold nanoparticle arrays can detect volatile organic compounds and molecules in aqueous environments. Moreover, the resorcinarene-coated nanostructured films were stable in air and water at ambient temperatures and show no appreciable loss in SERS activity over a period of several months.
机译：间苯二酚是增强分散和自组装金纳米颗粒的优异表面活性剂。四硫醇cavitands（如8和13）增强了悬浮在有机溶剂中的中纳米尺寸金颗粒的分散性和坚固性。在所检查的条件下，四-C-硫代甲基空泡石13是优于四-C-硫醇空泡石8的分散剂。但是，cavitand 8可在空气-水界面上对金纳米颗粒进行出色的分散控制，并使其自发组织成二维阵列。此外，我们研究了间苯二甲烯包封的金纳米颗粒的自组装与表面电荷和表面活性剂结构的关系。自组装纳米颗粒阵列中的单层形成程度和2D顺序受吸附在纳米颗粒表面的电解质（氯化物和/或柠檬酸盐）的数量和类型的影响很大。具有强化学吸附头基的间苯二碳二烯能促进二维阵列的自组装。金纳米颗粒阵列表现出与尺寸有关的消光最大值，其随着周期性增加而向近红外波长偏移。表面增强拉曼散射（SERS）随周期和入射波长的变化也很大，经验增强因子（G）的范围从104到超过107。大多数增强拉曼散射很可能是由局部电场效应产生的。阵列的缝隙和空腔，其深度和纵横比可通过更改单位粒径来调整。涂有间苯二甲烯的金纳米颗粒阵列可以检测水性环境中的挥发性有机化合物和分子。此外，间苯二甲烯涂层的纳米结构薄膜在环境温度下在空气和水中是稳定的，并且在数月的时间内没有显示出明显的SERS活性损失。

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