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Rapid fabrication of large-area nanoparticle monolayer films via water-induced interfacial assembly

机译：通过水诱导界面组装快速制备大面积纳米粒子单层膜

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Close-packed nanoparticle monolayer films have been assembled at the water/toluene interface, and they can be transferred onto various hydrophilic solid substrates. The method involves adding alcohol and then toluene (when the dispersant is itself alcohol, only toluene was added) into a hydrophilic nanoparticle dispersion, and then a large quantity of distilled water was rapidly poured into the mixed system. Simultaneously, nanoparticles in the dispersion were extracted to the water/toluene interface, forming a thin film with a metallic sheen. The close-packed structures of these thin films were verified by transmission electron microscopy (TEM) characterizations. This method can work well for those hydrophilic nanoparticles without strongly bonded stabilizers, such as citrate- stabilized Au nanoparticles, polyvinylpyrrolidone (PVP)-stabilized Pt or Ag nanoparticles, and SiO2 microspheres. Large-area nanoparticle monolayer films (e. g., more than 200 cm(2)) could be prepared in less than 10 s. Due to its inherent simplicity and speed, the method should be of significance for the nanofilm industry.
机译：紧密堆积的纳米颗粒单层膜已在水/甲苯界面处组装，可以将其转移到各种亲水性固体基质上。该方法包括向亲水性纳米颗粒分散体中添加醇，然后添加甲苯（当分散剂本身是醇时，仅添加甲苯），然后将大量蒸馏水迅速倒入混合体系中。同时，将分散体中的纳米颗粒提取到水/甲苯界面，形成具有金属光泽的薄膜。这些薄膜的密排结构通过透射电子显微镜（TEM）表征得到验证。对于那些没有牢固结合的稳定剂的亲水性纳米颗粒，例如柠檬酸盐稳定的Au纳米颗粒，聚乙烯吡咯烷酮（PVP）稳定的Pt或Ag纳米颗粒以及SiO2微球，该方法可以很好地工作。可以在不到10秒的时间内制备出大面积的纳米颗粒单层膜（例如，大于200 cm（2））。由于其固有的简单性和速度，该方法对于纳米膜工业应该是重要的。

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