Researchers go for the gold on a single chip

January 21, 2016 by Anne M Stark
A tunable laser creates a miniature library of nanoporous gold. Credit: Ryan Chen/LLNL

Lawrence Livermore National Laboratory researchers have created a library of nanoporous gold structures on a single chip that has direct applications for high-capacity lithium ion batteries as well as neural interfaces.

Nanoporous gold (np-Au), a porous metal used in energy and biomedical research, is produced through an alloy corrosion process known as dealloying that generates a characteristic three-dimensional nanoscale network of pores and ligaments.

In the cover article in the Jan. 14 issue of Nanoscale, a journal published by the Royal Society of Chemistry, LLNL researchers and their University of California, Davis (link is external) collaborators describe a method for creating a library of varying np-Au morphologies on a single chip via precise delivery of tunable laser energy. UC Davis professor Erkin Seker served as the principal investigator (PI) of the UC Fees project that primarily funded the work, along with co-PI Monika Biener of LLNL's Materials Science Division.

Laser microprocessing (e.g. micromachining) provides spatial and temporal control while imposing energy near the surface of the material.

"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," said LLNL staff scientist Ibo Matthews, co-author of the paper. "Laser microprocessing offers an attractive solution to this problem by providing a means to apply energy with high spatial and temporal resolution."

The researchers used multiphysics simulations to predict the effects of continuous wave vs. pulsed laser mode and varying thermal conductivity of the supporting substrate on the local np-Au film temperatures during photothermal annealing.

They were then able to fabricate an on-chip material library consisting of 81 np-Au samples of nine different morphologies for use in the parallel study of structure–property relationships.

"These libraries have the potential to drastically increase the throughput of morphology interaction studies for np-Au, specifically in applications such as high capacity lithium ion batteries, cell-material interaction studies for neural interfaces, analytical biosensors, as well as nanoscale material science studies," said Biener, co-author of the paper.

This work sets the foundation for understanding laser-based annealing of porous thin film . The fabrication of single chip material libraries has the potential to increase the throughput of material interaction testing in many disciplines through easy single-chip material screening libraries.

Explore further: Implantable electrode coating good as gold

More information: Christopher A. R. Chapman et al. Engineering on-chip nanoporous gold material libraries via precision photothermal treatment, Nanoscale (2016). DOI: 10.1039/C5NR04580K

Related Stories

Implantable electrode coating good as gold

May 5, 2015

A team of researchers from Lawrence Livermore and UC Davis have found that covering an implantable neural electrode with nanoporous gold could eliminate the risk of scar tissue forming over the electrode's surface.

Visualization of gold nanoparticle self-assembly via TEM

March 13, 2013

The self-assembly of gold nanoparticles (Au NPs) coated with specific organic ions in water was observed by Center for Nanoscale Materials staff in the Nanobio Interfaces, Electronic & Magnetic Materials & Devices, and Nanophotonics ...

Recommended for you

Clothing fabric keeps you cool in the heat

November 16, 2017

(—Researchers have designed a thermal regulation textile that has a 55% greater cooling effect than cotton, which translates to cooler skin temperatures when wearing clothes made of the new fabric. The material ...

Graphene water filter turns whisky clear

November 14, 2017

Previously graphene-oxide membranes were shown to be completely impermeable to all solvents except for water. However, a study published in Nature Materials, now shows that we can tailor the molecules that pass through these ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.