Soft and flexible gold microelectrodes by supersonic cluster beam deposition and femtosecond laser processing

Tali Dotan*, Yuval Berg, Lorenzo Migliorini, Sara Moon Villa, Tommaso Santaniello, Paolo Milani, Yosi Shacham-Diamand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Soft and flexible microelectrodes are fabricated and patterned in a novel approach integrating supersonic cluster beam deposition (SCBD) of gold nanoparticles onto Polydimethylsiloxane (PDMS) followed by femtosecond (fs) laser processing. SCBD of gold nanoparticles in PDMS forms a nanocomposite film with mechanical properties similar to those of the elastomeric substrate. Electrically neutral metallic nanoparticles penetrate the polymeric matrix and distribute randomly up to a depth of a few hundred nanometers forming a path of ohmic conduction. High resolution patterning on soft substrates is a major challenge that was overcome by femtosecond laser ablation of micrometer lines with relatively very little thermal damage. Microelectrodes were fabricated with a width down to 3 μm. The printed metal line sheet resistance was 480 Ohm/square for the 100 nm thick film and 210 Ohm/square for the 200 nm thick film. The calculated average film specific resistivity was found to be 2.5–2.6mΩ·cm. It is ~3 orders of magnitude higher than that of physical vapor deposited gold; therefore, it is not suitable for high current interconnects but sufficient for low-current signal transmission such as for electrical and electrochemical biosensors.

Original languageEnglish
Article number111478
JournalMicroelectronic Engineering
Volume237
DOIs
StatePublished - 15 Jan 2021

Funding

FundersFunder number
Boris Mints Institute for Strategic Policy Solutions
Manna Centre for Food Security
Fondazione Cariplo2018-1726
Israel Science Foundation1616/17
Tel Aviv University590351
Ministry of Science and Technology, Israel3-14345

    Keywords

    • Femtosecond lasers
    • Flexible electronics
    • Microelectrodes
    • Micropatterning
    • Nanocomposite films
    • Supersonic cluster beam deposition

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