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Simulation Informed CAD for 3D Nanoprinting

1
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
2
Bredesen Center for Interdisciplinary Research, The University of Tennessee, Knoxville, TN 37996, USA
3
Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
4
Christian Doppler Laboratory for Direct-Write Fabrication of 3D Nano-Probes, Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, 8010 Graz, Austria
5
Graz Centre for Electron Microscopy, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 8; https://doi.org/10.3390/mi11010008
Received: 31 October 2019 / Revised: 12 December 2019 / Accepted: 17 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Multi-Dimensional Direct-Write Nanofabrication )
A promising 3D nanoprinting method, used to deposit nanoscale mesh style objects, is prone to non-linear distortions which limits the complexity and variety of deposit geometries. The method, focused electron beam-induced deposition (FEBID), uses a nanoscale electron probe for continuous dissociation of surface adsorbed precursor molecules which drives highly localized deposition. Three dimensional objects are deposited using a 2D digital scanning pattern—the digital beam speed controls deposition into the third, or out-of-plane dimension. Multiple computer-aided design (CAD) programs exist for FEBID mesh object definition but rely on the definition of nodes and interconnecting linear nanowires. Thus, a method is needed to prevent non-linear/bending nanowires for accurate geometric synthesis. An analytical model is derived based on simulation results, calibrated using real experiments, to ensure linear nanowire deposition to compensate for implicit beam heating that takes place during FEBID. The model subsequently compensates and informs the exposure file containing the pixel-by-pixel scanning instructions, ensuring nanowire linearity by appropriately adjusting the patterning beam speeds. The derivation of the model is presented, based on a critical mass balance revealed by simulations and the strategy used to integrate the physics-based analytical model into an existing 3D nanoprinting CAD program is overviewed. View Full-Text
Keywords: focused electron beam induced deposition; 3D nanoprinting; Additive nanomanufacturing focused electron beam induced deposition; 3D nanoprinting; Additive nanomanufacturing
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Fowlkes, J.D.; Winkler, R.; Mutunga, E.; Rack, P.D.; Plank, H. Simulation Informed CAD for 3D Nanoprinting. Micromachines 2020, 11, 8.

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