An Ultrasensitive Graphene Bolometer

  • Author: Liam Critchley
  • Published: 22 May 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Nano/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: An Ultrasensitive Graphene Bolometer

Bolometers are sensors which measure electromagnetic radiation. The radiation is detected via the heating of a material with a temperature-dependent electrical resistance. Bolometers have applications in both civilian and military fields ranging from thermal imaging to the monitoring of buildings. As with any sensor, there is always a drive to improve the sensitivity of these devices.


Xinwei Wang, Iowa State University, Ames, USA, and colleagues have developed a bolometer that uses partly reduced graphene aerogel (PRGA) films as the active sensing material. The researchers created the PRGA films through a series of wet chemical reduction methods from a graphene oxide (GO) precursor. The resulting PRGA-based bolometer has a very high sensitivity to electromagnetic radiation, ranging from the ultraviolet region to the far-infrared region.


This high sensitivity is attributed to the abundance of functional groups in the PRGA films, which change the material's band gap, as well as to the high porosity, the low thermal conductivity of 6.0–0.6 mW m–1 K–1, and the ultralow density of 4 mg cm–3. The bolometer can detect a temperature change of 0.2 K, 1.0 K, or 3.0 K from a distance of 3 cm, 25 cm, or 54 cm, respectively. The device can detect laser powers as low as 5.9–7.5 µW.


 

Article Views: 738

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH