Metal alloy solid-state nanopores for single nanoparticle detection

Diego Coglitore, Andrea Merenda, Nicoletta Giamblanco, Ludovic F. Dumée, Jean Marc Janot, Sébastien Balme

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Solid-state nanopore technology for nanoparticle sensing is considered for the development of analytical tools to characterise their size, shape or zeta potential. In this field, it is crucial to understand how the nanopore inner surface influences the dynamic of nanoparticle translocation. Here, three single nanopores directly drilled in metal alloys (titanium nitride, titanium-tantalum and tantalum) are considered. The translocation of polystyrene nanoparticles coated with ssDNA is investigated by the resistive pulse method at different concentrations and voltages. The results show that the nanoparticle energy barrier for entrance into the pore decreases for nanopores that exhibits a higher surface energy and hydrophilicity, while the dwell time is found to depend on the nanopore surface state. Overall, this study demonstrates that the control of nanopore surface state must be taken into account for the resistive pulse experiments for nanoparticle detection.

Original languageBritish English
Pages (from-to)12799-12807
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number18
DOIs
StatePublished - 2018

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