Abstract
Currently, light-based three-dimensional (3D) printing with submicron features is mainly developed based on photosensitive polymers or inorganic-polymer composite materials. To eliminate polymer/organic additives, a strategy for direct 3D assembly and printing of metallic nanocrystals without additives is presented. Ultrafast laser with intensity in the range of 1 x 1010 to 1 x 1012 W/cm2 is used to nonequilibrium heat nanocrystals and induce ligand transformation, which triggers the spontaneous fusion and localized assembly of nanocrystals. The process is due to the operation of hot electrons as confirmed by a strong dependence of the printing rate on laser pulse duration varied in the range of electron-phonon relaxation time. Using the developed laser-induced ligand transformation (LILT) process, direct printing of 3D metallic structures at micro and submicron scales is demonstrated. Facile integration with other microscale additive manufacturing for printing 3D devices containing multiscale features is also demonstrated.
Recommended Citation
C. Podder et al., "Submicron Metal 3D Printing by Ultrafast Laser Heating and Induced Ligand Transformation of Nanocrystals," ACS Applied Materials and Interfaces, vol. 13, no. 35, pp. 42154 - 42163, American Chemical Society, Sep 2021.
The definitive version is available at https://doi.org/10.1021/acsami.1c10775
Department(s)
Mechanical and Aerospace Engineering
Keywords and Phrases
3D printing; femtosecond laser; hot electron; ligand; microadditive manufacturing; nanocrystals; submicron
International Standard Serial Number (ISSN)
1944-8252; 1944-8244
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Chemical Society, All rights reserved.
Publication Date
08 Sep 2021
PubMed ID
34432433
Comments
National Science Foundation, Grant 1635256