Anisotropic Particle Fabrication Using Thermal Scanning Probe Lithography.

Area of Science:

• Nanotechnology
• Materials Science
• Surface Science

Background:

• Controlling nanoparticle size, shape, and chemical properties is crucial for tuning optical and physicochemical characteristics.
• Existing methods for synthesizing anisotropic nanoparticles often struggle with polydispersity, shape, size, and composition control.

Purpose of the Study:

• To develop a unique, flexible, and efficient pathway for producing monodispersed anisotropic nano- and microparticles with diverse shapes and compositions.
• To establish a state-of-the-art nanolithographic method that is fast, easy to prototype, and requires minimal mechanical setup.

Main Methods:

• Utilized thermal scanning probe lithography combined with dry reactive ion etching to create 2D and 3D templates.
• Employed electron-beam evaporation for depositing various metal/metal oxide materials onto templates.
• Characterized fabricated particles using atomic force microscopy, He-ion microscopy, scanning electron microscopy, and dynamic light scattering.

Main Results:

• Successfully fabricated monodispersed anisotropic nanoparticles and microparticles with diverse shapes including triangular prisms, ovals, disks, flowers, and stairs.
• Demonstrated flexibility in material choice and precise control over particle shape and size.
• Confirmed the reproducibility, flexibility, and robustness of the developed fabrication method.

Conclusions:

• The novel nanolithographic approach provides a versatile and efficient platform for creating precisely controlled anisotropic nanomaterials.
• This method overcomes key challenges in nanoparticle synthesis, enabling tailored properties for potential applications.
• The technique's adaptability in shape and composition makes it a valuable tool for advanced nanomaterial fabrication.