The device is claimed to have
advantages compared with infrared absorption spectroscopy, the most
commonly used molecule detection method.
The
European researchers claim to have harnessed the optical and electronic
properties of graphene to create a tunable sensor capable of detecting
nanoscale molecules such as proteins and drugs.
The
researchers used graphene to improve on a well-known molecule-detection
method: infrared absorption spectroscopy, which has important
limitations when applied to molecules at the nano-scale. The wavelength
of the infrared photon directed at a molecule is around 6 microns (6000
nm), while the target measures only a few nanometres, making it
challenging to detect the vibration of such a small molecule.
If
given the correct geometry, graphene is capable of focusing light on a
precise spot on its surface and 'hearing' the vibration of a nanometric
molecule that is attached to it. In the study , researchers first
pattern nanostructures on the graphene surface by bombarding it with
electron beams and etching it with oxygen ions. When the light arrives,
the electrons in graphene nanostructures begin to oscillate. The
phenomenon concentrates light into tiny spots, which are comparable with
the dimensions of the target molecules making it possible to detect
nanometric compounds in proximity to the surface.
If you want to get more about gas sensor,gas transmitter, humidity sensors suppliers, humidity sensors manufactures, infrared sensors manufactuers, infrared sensors suppliers,gas sensor manufactures,gas sensor suppliers from en.ofweek.com, please follow http://en.ofweek.com/manufacturer/sensor.
Source: http://global.ofweek.com/news/Tunable-mid-infrared-graphene-sensor-detects-nanoscale-molecules-31990
沒有留言:
張貼留言