Researchers in the University of Minnesota College of Science and Engineering have developed a unique new device using the wonder material graphene that provides the first step toward ultrasensitive biosensors to detect diseases at the molecular level with near perfect efficiency.
Ultrasensitive biosensors for probing protein structures could greatly improve the depth of diagnosis for a wide variety of diseases extending to both humans and animals. These include Alzheimer’s disease, Chronic Wasting Disease, and mad cow disease—disorders related to protein misfolding. Such biosensors could also lead to improved technologies for developing new pharmaceutical compounds.
The research is published in Nature Nanotechnology, a peer-reviewed scientific journal published by Nature Publishing Group.
“In order to detect and treat many diseases we need to detect protein molecules at very small amounts and understand their structure,” said Sang-Hyun Oh, University of Minnesota electrical and computer engineering professor and lead researcher on the study. “Currently, there are many technical challenges with that process. We hope that our device using graphene and a unique manufacturing process will provide the fundamental research that can help overcome those challenges.”
Graphene, a material made of a single layer of carbon atoms, was discovered more than a decade ago. It has enthralled researchers with its range of amazing properties that have found uses in many new applications, including creating better sensors for detecting diseases.
Significant attempts have been made to improve biosensors using graphene, but the challenge exists with its remarkable single atom thickness. This means it does not interact efficiently with light when shined through it. Light absorption and conversion to local electric fields is essential for detecting small amounts of molecules when diagnosing diseases. Previous research utilizing similar graphene nanostructures has only demonstrated a light absorption rate of less than 10 percent.
In this new study, University of Minnesota researchers combined graphene with nano-sized metal ribbons of gold. Using sticky tape and a high-tech nanofabrication technique developed at the University of Minnesota, called “template stripping,” researchers were able to create an ultra-flat base layer surface for the graphene.
They then used the energy of light to generate a sloshing motion of electrons in the graphene, called plasmons, which can be thought to be like ripples or waves spreading through a “sea” of electrons. Similarly, these waves can build in intensity to giant “tidal waves” of local electric fields based on the researchers’ clever design.
By shining light on the single-atom-thick graphene layer device, they were able to create a plasmon wave with unprecedented efficiency at a near-perfect 94 percent light absorption into “tidal waves” of electric field. When they inserted protein molecules between the graphene and metal ribbons, they were able to harness enough energy to view single layers of protein molecules.
“Our computer simulations showed that this novel approach would work, but we were still a little surprised when we achieved the 94 percent light absorption in real devices,” said Oh, who holds the Sanford P. Bordeau Chair in Electrical Engineering at the University of Minnesota. “Realizing an ideal from a computer simulation has so many challenges. Everything has to be so high quality and atomically flat. The fact that we could obtain such good agreement between theory and experiment was quite surprising and exciting.”
The Latest on: Biosensors
via Google News
The Latest on: Biosensors
- New device for faster detection of antibiotic-resistant bacteria developedon November 30, 2020 at 11:01 pm
Researchers at Department of Electrical and Computer Engineering at Binghamton University's Thomas J. Watson College of Engineering and Applied Science are researching a faster ...
- Star Trek-inspired personalized medicine is on the horizon | Opinionon November 29, 2020 at 8:30 am
Think Star Trek’s handheld tricorder, a medical diagnostic device that made its first appearance in the original TV series. This sci-fi precursor is now changing the face of personalized medicine by ...
- Global Biophotonics Markets to 2025: Focus on Surface Imaging, Molecular Spectroscopy, Microscopy, Light Therapy, Biosensors, Inside Imaging, See-through Imaging ...on November 25, 2020 at 6:39 am
The "Biophotonics Market: Global Industry Trends, Share, Size, Growth, Opportunity and Forecast 2020-2025" report has been added to ResearchAndMarkets.com's offering. The global biophotonics market ...
- Grabbing viruses out of thin air: The ongoing quest to fabricate functional biosensorson November 25, 2020 at 6:15 am
Together with colleagues, they published a review in the journal Advanced Materials about the most recent endeavors into using these materials to fabricate functional biosensors. "Research on ...
- Graphene Electrodes to Power Next-Gen Electrochemical Sensors, Biosensorson November 17, 2020 at 7:28 am
Researchers at KAUST have devised a simple technique that involves using laser beams to develop graphene electrodes with better performance compared to those made using previous techniques.
- Biosensors Market Research Report by Type, by Product, by Technology, by Industry - Global Forecast to 2025 - Cumulative Impact of COVID-19on November 3, 2020 at 8:16 pm
New York, Nov. 03, 2020 (GLOBE NEWSWIRE) -- Reportlinker.com announces the release of the report "Biosensors Market Research Report by Type, by Product, by Technology, by Industry - Global ...
- Biosensors Market Research Report by Type, by Product, by Technology, by Industry - Global Forecast to 2025 - Cumulative Impact of COVID-19on November 3, 2020 at 7:40 pm
Disclaimer | Commerce Policy | Made In NYC | Stock quotes by finanzen.net New York, Nov. 03, 2020 (GLOBE NEWSWIRE) -- Reportlinker.com announces the release of the report "Biosensors Market ...
- Biosensors Market Research Report by Type, by Product, by Technology, by Industry - Global Forecast to 2025 - Cumulative Impact of COVID-19on November 3, 2020 at 7:20 pm
New York, Nov. 03, 2020 (GLOBE NEWSWIRE) -- Reportlinker.com announces the release of the report "Biosensors Market Research Report by Type, by Product, by Technology, by Industry - Global Forecast to ...
via Bing News