Carnegie Mellon researchers create 10-second COVID test

A novel sensor platform with printed 3D micropillars could mean rapid COVID-19 testing

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ALBUQUERQUE, N.M.—Researchers at Carnegie Mellon University (CMU) have created a low-cost sensor that can reportedly identify COVID-19 antibodies in around 10 seconds. The novel sensor is based on a special structure of tiny gold electrodes that are 3D printed using Optomec Inc.’s Aerosol Jet process.
This technology would allow clinicians to quickly and accurately detect the COVID-19 antibodies due to the specific geometry and surface characteristics of the printed structure. The low-cost sensor, which is just entering trials with COVID patients, could prove to be a key tool in understanding the path and concentration of the pandemic.
The breakthrough test identifies two antibodies of the virus, and is capable of detection even at very low concentrations through an electrochemical reaction sensed in the 3D printed structure within a simple handheld device that interfaces with a smartphone. CMU researchers have also begun research that will allow this platform to detect the active virus, in addition to its antibodies.
The 3D printed sensor was developed by the team of Rahul Panat, associate professor of Mechanical Engineering at Carnegie Mellon University, who researches additive manufacturing techniques for producing biosensing devices and human-computer interfaces.
“My research team was working on 3D printed high-performance sensors to detect dopamine, a chemical in the brain, when we realized that we could adapt our work for COVID-19 testing. We shifted our research to apply our expertise to combating this devastating pandemic,” said Panat. “The Aerosol Jet process was critical to producing a sensor with high sensitivity and speed.”
Panat collaborated with Shou-Jiang Gao, leader of the Cancer Virology Program at UPMC Hillman Cancer Center and professor of microbiology and molecular genetics at the University of Pittsburgh. More information on the project is available here.
Aerosol Jet is a production process capable of printing extremely precise conductive and non-conductive materials with features as fine as 10 microns. For the CMU COVID-19 sensor, ink droplets containing nanoparticles were precisely placed to build a matrix of 100 gold pillars in 2 mm square at high speed. The pillars were then coated with reduced graphene oxide, which binds the antibodies to the gold electrodes.
The device could also have the potential to detect other viruses like Zika, Ebola and HIV, according to the researchers.

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