Free-Standing 2D Janus Gold Nanoparticles Monolayer Film with Tunable Bifacial Morphologies via the Asymmetric Growth at Air Liquid Interface
Free-Standing 2D Janus Gold Nanoparticles Monolayer Film with Tunable Bifacial Morphologies via the Asymmetric Growth at Air Liquid Interface
复制标题
通过气液界面的不对称生长具有可调双面形态的独立式 2D Janus 金纳米颗粒单层薄膜
DOI：
10.1021/acs.langmuir.9b03189
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发表时间：
2020-01-14
期刊：
影响因子：
3.9
通讯作者：
Chen, Tao
中科院分区：
文献类型：
--
作者：
Cheng, Qian;Song, Liping;Chen, Tao
金纳米粒子的大尺度二维自支撑单层膜显示出独特的光学、电学和化学物理性质，使其成为一类不同于块状材料和溶液中单个纳米粒子的新型先进等离子体材料。传统的二维金纳米粒子薄膜通常具有对称的结构和相同的性质的金纳米粒子的两侧。在此，我们开发了一种简单有效的方法来构建一种新型的具有不对称金纳米颗粒结构和功能的独立2D金纳米颗粒单层膜，称为2D Janus金纳米颗粒膜。我们的方法的显着特点是随后的不对称生长的一侧的界面自组装金纳米粒子单层膜在气液界面。通过简单而精确地调节顶面上的金纳米颗粒的尺寸和形状，并通过生长金纳米颗粒或其他贵金属如Ag、Pt和Pd来选择性地调节膜底面上的结构和组成，可以非常容易地控制Janus膜的形态。不同于传统制备的Janus膜在固体基底上，需要长时间的蚀刻和转移程序，我们的方法的其他功能包括短的时间内完成界面自组装和随后的不对称生长，以及容易转移到不同的基板上的Janus膜的属性，如石英玻璃片，硅片，和PDMS。所获得的Janus金纳米颗粒膜显示出非对称的润湿性、光学性质和表面增强拉曼散射（Sers）效应，这在光学器件、传感器和不对称催化等方面具有潜在的应用前景。
Large scaled two-dimensional free-standing monolayer films of gold nanoparticles show distinctive optical, electrical, and chem-physical propertie making them a new class of advanced plasmonic materials differing from bulk materials and individual nanoparticles in solution. The conventional 2D gold nanoparticle films usually possess symmetric structures and identical properties of gold nanoparticles on both sides. Herein, we developed an easy and efficient approach to construct a new type of free-standing 2D gold nanoparticle monolayer film with asymmetric gold nanoparticle structures and functions, called a 2D Janus gold nanoparticle film. The remarkable feature of our method is the subsequent asymmetric growth on one side of the interfacial self-assembled gold nanoparticle monolayer film at the air liquid interface. It is very easy to control the morphology of the Janus film by simply and precisely adjusting the size and shape of the gold nanoparticles on the top side, and selectively tuning the structure and composition on the bottom side of the film by growing gold nanoparticles or other noble metals such as Ag, Pt, and Pd. Unlike the conventionally prepared Janus films at solid substrate that require long-time etching and transfer procedures, other features of our method include the short time in which the interfacial self-assembly and the subsequent asymmetric growth are completed as well as the easily transferable property of the Janus film onto different substrates, such as quartz glass sheets, silicon wafers, and PDMS. The obtained Janus gold nanoparticle film shows asymmetric wettabilities, optical properties, and surface-enhanced Raman scattering (SERS) effects, which is promising for a range of potential applications in optical devices, sensors, and asymmetric catalysis.