Das Tanweepriya, Smith James D, Uddin Md Hemayet, Dagastine Raymond R
Department of Chemical Engineering, University of Melbourne, Parkville 3010, Australia.
Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton 3168, Australia.
ACS Appl Mater Interfaces. 2022 May 4;14(17):19878-19888. doi: 10.1021/acsami.2c02885. Epub 2022 Apr 22.
Size, shape, and chemical properties of nanoparticles are powerful tools to modulate the optical and physicochemical properties of a particle suspension. Despite having many methods to synthesize anisotropic nanoparticles, often there are challenges in terms of controlling the polydispersity, shape, size, or composition of anisotropic nanoparticles. This work has been inspired by the potential for developing a unique pathway to make different shaped monodispersed anisotropic nano- and microparticles with large flexibility in material choice. Compared to existing methods, this state-of-the-art nanolithographic method is fast, easy to prototype, and much simple in terms of its mechanical requirement. We show that this technique has been efficiently used to make a variety of anisotropic nano- and microparticles of different shapes, such as triangular prisms, ovals, disks, flowers, and stairs following the same pathway, at the same time showing the potential of being flexible with respect to the composition of the particles. The thermal scanning probe lithographic method in combination with dry reactive ion etching was used to make two-dimensional and three-dimensional templates for the fabrication of anisotropic nano- and microparticles. Deposition of different metal/metal oxides by the electron-beam evaporation method onto these templates allowed us to fabricate a range of nanomaterials according to the required functionality in potential applications. The particles were characterized by atomic force microscopy, He-ion microscopy, scanning electron microscopy, and dynamic light scattering to ensure that the developed method is reproducible, flexible, and robust in choosing the shapes for making monodispersed anisotropic nanoparticles with great control over shape and size.
纳米颗粒的尺寸、形状和化学性质是调节颗粒悬浮液光学和物理化学性质的有力工具。尽管有许多合成各向异性纳米颗粒的方法，但在控制各向异性纳米颗粒的多分散性、形状、尺寸或组成方面往往存在挑战。这项工作的灵感来自于开发一条独特途径的潜力，该途径能够制造出具有不同形状的单分散各向异性纳米颗粒和微米颗粒，并且在材料选择上具有很大的灵活性。与现有方法相比，这种最先进的纳米光刻方法速度快、易于制作原型，并且在机械要求方面更为简单。我们表明，该技术已被有效地用于通过相同途径制造各种不同形状的各向异性纳米颗粒和微米颗粒，如三角棱柱、椭圆形、圆盘、花朵和阶梯状颗粒，同时还展示了在颗粒组成方面具有灵活性的潜力。热扫描探针光刻法与干式反应离子蚀刻相结合，用于制造用于制备各向异性纳米颗粒和微米颗粒的二维和三维模板。通过电子束蒸发法将不同的金属/金属氧化物沉积到这些模板上，使我们能够根据潜在应用中的所需功能制造一系列纳米材料。通过原子力显微镜、氦离子显微镜、扫描电子显微镜和动态光散射对颗粒进行表征，以确保所开发的方法在选择形状以制造具有良好形状和尺寸控制的单分散各向异性纳米颗粒方面具有可重复性、灵活性和稳健性。
