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

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 specif...

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Bibliographic Details
Published in:Nanoscale 2016-01, Vol.8 (2), p.785-795
Main Authors: Chapman, Christopher A R, Wang, Ling, Biener, Juergen, Seker, Erkin, Biener, Monika M, Matthews, Manyalibo J
Format: Article
Language:English
Subjects:
Alloys
Biosensing Techniques
Computer Simulation
Diffusion
Finite Element Analysis
GENERAL AND MISCELLANEOUS
Glass
Gold - chemistry
Hot Temperature
Lasers
MATERIALS SCIENCE
Materials Testing
Metal Nanoparticles - chemistry
Microscopy, Electron, Scanning - methods
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructures - chemistry
Nitrogen - chemistry
Photochemistry - methods
Porosity
Silicon - chemistry
Silver - chemistry
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Summary: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.
ISSN:2040-3364
2040-3372
2040-3372
DOI:10.1039/c5nr04580k