Graphene, CNT NEMS resonators exhibit nonlinear damping

May 17, 2011 — Catalan Institute of Nanotechnology Professor Adrian Bachtold and his research group created resonators from nanoscale graphene and carbon nanotubes (CNT) that exhibit nonlinear damping. This result could lead to supersensitive detectors of force or mass.

The team formed nanoscale resonators by suspending tiny graphene sheets or carbon nanotubes and clamping them at each end. These devices, similar to guitar strings, can be set to vibrate at very specific frequencies.

Click to Enlarge
Figure. A depiction of the nanoscale mechanical resonators constructed with graphene and CNTs. SOURCE: Catalan Institute of Nanotechnology.

Mechanical resonators mark time in electronic components and stabilize radio transmissions. In all mechanical resonators studied to date, from large objects several metres in size down to tiny components just a few tens of nanometers in length, damping has always been observed to occur in a highly predictable, linear manner.

Bachtold’s research demonstrates that this linear damping paradigm breaks down for resonators with critical dimensions on the atomic scale. The damping is strongly nonlinear for resonators based on nanotubes and graphene, a characteristic that facilitates amplification of signals and dramatic improvements in sensitivity.

Damping is central to the physics of nanoelectromechanical (NEMS) resonators, lying at the core of quantum and sensing experiments. Therefore many predictions that have been made for nanoscale electro-mechanical devices now need to be revisited when considering nanotube and graphene resonators. Prof. Bachtold’s group has achieved a new record in quality factor for graphene resonators and ultra-weak force sensing with a nanotube resonator, using these atomic-level devices.

Results will be published in Nature Nanotechnology (DOI 10.1038/NNANO.2011.71). To retrieve the abstract and full text, visit DOI 10.1038/ NNANO.2011.71

Follow Small Times on by clicking Or join our Facebook group


Easily post a comment below using your Linkedin, Twitter, Google or Facebook account. Comments won't automatically be posted to your social media accounts unless you select to share.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>


SEMI-GAS Xturion Blixer enables on-site blending of forming gas mixtures
10/03/2017The Blixer provides a cost-effective alternative to purchasing expensive pre-mixed gas cylinders by enabling operators to blend ...
Automated thickness measurement system speeds production
09/20/2017ACU-THIK is an automated thickness measurement tool incorporating dual contact probes for high accuracy inspection of semiconductor wafers....
3D-Micromac launches the second generation of its high-performance microcell OTF laser systems
04/17/2017The high-performance production solution for Laser Contact Opening (LCO) of PERC solar cells achieves a th...