Graphene turned medical sensor: can detect brain cancer cells
Release date: 2017-01-13
Graphene, a honeycomb planar film formed by sp2 hybridization of carbon atoms, is a quasi-two-dimensional material with only one atomic layer thickness, also called monoatomic layer graphite. Because there is only one layer of atoms, the motion of electrons is confined to a plane, and graphene also has new electrical properties.
Jianghu is rumored that graphene will be the core of the next industrial revolution. Its discovery is revolutionary, discovered only in 2004, and won the Nobel Prize in Physics in 2010. Graphene is the world's most conductive material, in which electrons move at speeds of up to 1/300 of the speed of light, far exceeding the speed at which electrons travel in general conductors.
According to the news, a team of scientists at the University of Illinois at Chicago (UIC) made graphene a sensor that distinguishes between normal astrocytes and astroglioma cells. Graphene, as a carbon lattice of atomic thickness, can detect certain properties when contacted with individual cells.
The peripheral electrons of the graphene carbon atoms form a conjugated large π bond, and the charge can move freely on the surface. When this material is in contact with cells, the cell traits are different, and the charge distribution on the adjacent graphene surface also exhibits different characteristics. Cancer cells have high metabolic activity, so there are many electrons on their surface. These electrons may replace the electrons on the surface of graphene. This phenomenon is not observed in normal cells.
The change in charge distribution on graphene changes the energy of the vibration of its carbon atoms, and this change can be detected by Raman spectroscopy. According to the test results, it can be judged whether the cells belong to cancer cells.
Source: Lei Feng network (micro signal leiphone-sz)
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