Continuous Nanoparticle Assembly by a Modulated Photo-Induced Microbubble for Fabrication of Micrometric Conductive Patterns

Nina Armon, Ehud Greenberg, Michael Layani, Yitzchak S. Rosen, Shlomo Magdassi, Hagay Shpaisman

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


The laser-induced microbubble technique (LIMBT) has recently been developed for micro-patterning of various materials. In this method, a laser beam is focused on a dispersion of nanoparticles leading to the formation of a microbubble due to laser heating. Convection currents around the microbubble carry nanoparticles so that they become pinned to the bubble/substrate interface. The major limitation of this technique is that for most materials, a noncontinuous deposition is formed. We show that continuous patterns can be formed by preventing the microbubble from being pinned to the deposited material. This is done by modulating the laser so that the construction and destruction of the microbubble are controlled. When the method is applied to a dispersion of Ag nanoparticles, continuous electrically conductive lines are formed. Furthermore, the line width is narrower than that achieved by the standard nonmodulated LIMBT. This approach can be applied to the direct-write fabrication of micron-size conductive patterns in electronic devices without the use of photolithography.

Original languageEnglish
Pages (from-to)44214-44221
Number of pages8
JournalACS applied materials & interfaces
Issue number50
StatePublished - 20 Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.


The authors acknowledge the help of Moshe Feldberg for his technical assistance with sputtering and the help of Eitan Edri for his assistance with graphics and FIB. This research was partially supported by the Singapore National Research Foundation under the CREATE program: Nanomaterials for Energy and Energy-Water Nexus.

FundersFunder number
National Research Foundation Singapore


    • direct laser writing
    • directed assembly
    • microbubble
    • nanoparticle assembly
    • pattern formation
    • pinning


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