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KAUST team uses laser scribing to create graphene electrodes for biosensors

Feb 15, 2017

Researchers at the King Abdullah University of Science and Technology (KAUST) have created graphene electrodes that function as effective biosensors, by using a laser inscribe patterns into a polymer sheet. The laser scribing technique locally heats parts of a flexible polyimide polymer to 2500 degrees Celsius or more to form carbonized patterns of patches on the surface that act as electrodes.

KAUST uses laser scribing to make biosensors

The black patches are about 33-micrometers thick, with a highly porous nature that allows molecules to permeate the material. Inside the patches, the graphene sheets have exposed edges that are effective at exchanging electrons with other molecules. "Graphene-based electrodes with more edge-plane sites are effectively better than those relying on carbon or carbon-oxygen sites in the plane of the material," said a member of the KAUST team.

Exeter team develops a simple and cheap way to make graphene devices

Jan 24, 2017

A team of researchers from Exeter’s Centre for Graphene Science have developed a method for creating entire device arrays directly on the copper substrates used for the commercial manufacture of graphene. Complete and fully-functional devices can then be transferred to a substrate of choice, such as silicon, plastics or even textiles.

This new approach is simpler than conventional ways of producing graphene-based devices, and could lead the way to using simple and cheap-to-produce graphene devices for various applications, from gas and bio-medical sensors to touch-screen displays.

Graphene-based sensor can track vital signs

Jan 23, 2017

Researchers at the University of Texas have developed a graphene-based health sensor that attaches to the skin like a temporary tattoo and takes measurements with the same precision as bulky medical equipment. The graphene tattoos are said to be the thinnest epidermal electronics ever made. They can measure electrical signals from the heart, muscles, and brain, as well as skin temperature and hydration.

Graphene sensor to track vital signs image

The research team hopes to integrate these sensors applications like consumer cosmetics, in addition to providing a more convenient replacement for existing medical equipment. The sensor takes advantage of graphene's mechanical invisibility - when the sensor goes on the skin, it doesn’t just stay flat—it conforms to the microscale ridges and roughness of the epidermis.

Polish team creates transparent cryogenic temperature sensor

Jan 08, 2017

Researchers from the Lodz University of Technology in Poland have designed a transparent, flexible cryogenic temperature sensor with graphene structures as sensing elements. Such sensors could be useful for any field that requires operating in low-temperatures, such as medical diagnostics, space exploration and aviation, processing and storage of food and scientific research.

Making graphene transparent cryogenic temperature sensors

The sensors were repeatedly cooled from room temperature to cryogenic temperature. Graphene structures were characterized using Raman spectroscopy. The observation of the resistance changes as a function of temperature indicates the potential use of graphene in the construction of temperature sensors. The temperature characteristics of the analyzed graphene sensors exhibit no clear anomalies or strong non-linearity in the entire studied temperature range (as compared to the typical carbon sensor).

Graphene enables a system that can detect cancer cells

Dec 20, 2016

Researchers at the University of Illinois at Chicago have shown an interfacing system that can differentiate a single cancerous cell from a normal cell using graphene, hopefully opening the door to developing a simple, noninvasive tool for early cancer diagnosis.

Graphene to detect cancer image

The team explains that this graphene system is able to detect the level of activity of an interfaced cell. The cell's interface with graphene rearranges the charge distribution in graphene, which modifies the energy of atomic vibration as detected by Raman spectroscopy. The atomic vibration energy in graphene's structure differs depending on whether it's in contact with a cancer cell or a normal cell, because the cancer cell's hyperactivity leads to a higher negative charge on its surface and the release of more protons.