Ehud Greenberg - Video Lecture

Ehud Greenberg - Video Lecture

IVS-IPSTA 2020 Online Conference December 13, 2020

Materials Assembly & Sensors Session
Session chair:
Amit Sitt

Tel Aviv University

Ultrathin Flexography and Digital Transfer Printing Using Engineered Carbon Nanotube Surfaces

Ehud Greenberg

Department of Chemistry and Institute for Nanotechnology and Advanced Materials,
Bar Ilan University, Israell


While 3D printing of polymeric materials is prevalent, metals are indispensable for structural support, heat dissipation and electrical conductivity. Extensive research to allow additive manufacturing (AM) of metals has resulted in a range of techniques, the most established of them are selective laser melting (SLM) and electron beam melting (EBM). Alas, these methods are not suitable for the microscale regime due to minimum line width of tens of microns, limited by the size of metal particles used and heat dissipation.

We demonstrate a new three-dimensional printing (3DP) method based on continuous wave (CW) lasers that promote directed thermal decomposition of metal ion solutions, leading to formation of metallic deposition. By controlling the motion of the sample and/or laser, continuous 3D microstructures could be formed. Analyzing the building blocks of these structures reveal that they are a mix of crystalline and amorphous moieties. We discuss the origin of these moieties and what they disclose regarding the deposition mechanism. Our approach offers 3DP with higher resolutions (down to a diameter of 900 nm) and aspect ratios (>100) than commonly used methods. Our unique method also allows incorporation of various nanoparticles (NPs) into the metallic microstructures, potentially giving them improved mechanical, thermal and magnetic properties. Moreover, this method holds the potential of printing various metal combinations and fast vector printing that will also form more homogenous structures (compared to layer by layer printing). Additionally, we have shown that modulation of the laser beam significantly improves the control over the process and is essential for achieving high quality products.