Engineering on-chip nanoporous gold material libraries via precision photothermal treatment

Christopher A.R. Chapman, Ling Wang, Juergen Biener, Erkin Seker, Monika M. Biener, Manyalibo J. Matthews

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Libraries of nanostructured materials on a single chip are a promising platform for high throughput and combinatorial studies of structure-property relationships in the fields of physics and biology. Nanoporous gold (np-Au), produced by an alloy corrosion process, is a nanostructured material specifically suited for such studies because of its self-similar thermally induced coarsening behavior. However, traditional heat application techniques for the modification of np-Au are bulk processes that cannot be used to generate a library of different pore sizes on a single chip. Here, laser micro-processing offers an attractive solution to this problem by providing a means to apply energy with high spatial and temporal resolution. In the present study we use finite element multiphysics simulations to predict the effects of laser mode (continuous-wave vs. pulsed) and thermal conductivity of the supporting substrate on the local np-Au film temperatures during photothermal annealing. Based on these results we discuss the mechanisms by which the np-Au network is coarsened. Thermal transport simulations predict that continuous-wave mode laser irradiation of np-Au thin films on a silicon substrate supports the widest range of morphologies that can be created through photothermal annealing of np-Au. Using the guidance provided by simulations, we successfully fabricate an on-chip material library consisting of 81 np-Au samples of 9 different morphologies for use in the parallel study of structure-property relationships.

Original languageEnglish (US)
Pages (from-to)785-795
Number of pages11
JournalNanoscale
Volume8
Issue number2
DOIs
StatePublished - Jan 14 2016

ASJC Scopus subject areas

  • Materials Science(all)

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    Chapman, C. A. R., Wang, L., Biener, J., Seker, E., Biener, M. M., & Matthews, M. J. (2016). Engineering on-chip nanoporous gold material libraries via precision photothermal treatment. Nanoscale, 8(2), 785-795. https://doi.org/10.1039/c5nr04580k