PREPARATION AND CHARACTERIZATION OF AU COLLOID MONOLAYERS
PREPARATION AND CHARACTERIZATION OF AU COLLOID MONOLAYERS
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DOI：
10.1021/ac00100a008
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发表时间：
1995-02-15
影响因子：
7.4
通讯作者：
NATAN, MJ
中科院分区：
文献类型：
--
作者：
GRABAR, KC;FREEMAN, RG;NATAN, MJ
报道了胶体金颗粒二维阵列的设计和初步表征。这些表面是通过将直径12nn的胶体Au粒子自组装到具有对Au具有高亲和力的侧链官能团(即CN、SH和NH2)的固定化聚合物上来制备的。聚合物是由官能化的烷氧基硅烷在清洁的石英、玻璃和二氧化硅表面缩合而成。组装方案完全在溶液中进行：清洁的基板浸泡在有机硅烷的甲醇溶液中，漂洗，然后浸入胶体金的水溶液中。在聚合物表面自发形成二维阵列，用紫外可见光谱、透射电子显微镜和表面增强拉曼散射对其进行了表征。透射电子显微镜数据显示，两个粒子在空间上是分开的，但足够近，可以进行电磁相互作用(与波长相比，间距较小)。UV-Vis数据表明，在650-750 nm范围内存在集体粒子表面等离子体激元模式，这表明这些组装具有表面增强拉曼散射活性。情况确实如此，增强系数约为10(4)。Au胶体单分子膜具有一系列使其在基础和应用方面都非常有吸引力的特征，包括均匀的粗糙度、高稳定性和生物兼容性。
The design and initial characterization of two-dimensional arrays of colloidal Au particles are reported. These surfaces are prepared by self-assembly of 12 nn diameter colloidal Au particles onto immobilized polymers having pendant functional groups with high affinity for Au (i.e., CN, SH, and NH2). The polymers are formed by condensation of functionalized alkoxysilanes onto cleaned quartz, glass, and SiO2 surfaces. The assembly protocol is carried out completely in solution: cleaned substrates are immersed in methanolic solutions of organosilane, rinsed, and subsequently immersed in aqueous colloidal Au solutions. Two-dimensional arrays spontaneously form on the polymer surface, The resulting substrates have been characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), and surface-enhanced Raman scattering (SERS). TEM data show that the particles are spatially separated but close enough to interact electromagnetically (small spacing compared to lambda). The UV-vis data show that collective particle surface plasmon modes are present in the 650-750 nm region, suggesting that these assemblies are SERS-active. This is indeed the case, with enhancement factors of roughly 10(4). Au colloid monolayers possess a set of features that make them very attractive for both basic and applied uses, including uniform roughness, high stability, and biocompatibility.