Home > Press > Scientists Determine Fluctuations Caused by Temperature on Graphene Surface
Abstract:
Iranian researchers from Shahid Rajayee Teacher Training University in association with foreign researchers succeeded in the measurement of thermal fluctuations created on the surface of graphene.
Graphene, being discovered about a decade ago by physicists from University of Manchester, has attracted the attention of many researchers in various sciences and engineering aspects due to its unique physical properties, including thermal and electrical conductivity, high density and mobility in charge carriers and optical and mechanical properties.
By using scanning tunneling microscopic (STM) measurements taken from graphene surface, the researchers measured forced and free thermal fluctuations created in low frequency in graphene. The research was carried out by theoretical physicists from Shahid Rajayee Teacher Training University, University of Arkansas in the United States, University of Basel in Switzerland and University of Antwerp in Belgium.
Dr. Mehdi Nik Amal, the supervisor of the research, explained about the results, and said, "The measurement was carried out on the surface of suspended graphene with an area of one square angstrom. Our observation shows that the force caused by the heat produced tunneling process and electrostatic force caused by bios voltage compete with each other during the control and change in fluctuations on graphene surface. Tunneling current acts on graphene surface in a way that causes thermal tension on the surface, the tension is opposed to other normal mechanical tensions due to graphene's negative thermal extension coefficient at room temperature. This fact finally results in significant reduction in graphene's fluctuation frequency."
Results of the research have been published in Nature Communication, vol. 5, issue 3720, April 2014, pp. 4720-1 to 4720-6.
####
For more information, please click here
Copyright © Fars News Agency
If you have a comment, please Contact us.Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Related News Press |
News and information
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Imaging
Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024
Graphene/ Graphite
NRL discovers two-dimensional waveguides February 16th, 2024
Discoveries
Chemical reactions can scramble quantum information as well as black holes April 5th, 2024
New micromaterial releases nanoparticles that selectively destroy cancer cells April 5th, 2024
Utilizing palladium for addressing contact issues of buried oxide thin film transistors April 5th, 2024
Materials/Metamaterials/Magnetoresistance
Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024
Focused ion beam technology: A single tool for a wide range of applications January 12th, 2024
Announcements
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Tools
Ferroelectrically modulate the Fermi level of graphene oxide to enhance SERS response November 3rd, 2023
The USTC realizes In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors November 3rd, 2023
The latest news from around the world, FREE | ||
Premium Products | ||
Only the news you want to read!
Learn More |
||
Full-service, expert consulting
Learn More |
||