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Heat conduction through a DNA-gold composite.

Takashi Kodama1, Ankur Jain, Kenneth E Goodson

  • 1Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA. kodama@stanford.edu

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|May 14, 2009
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Area of Science:

  • Materials Science
  • Biophysics
  • Nanotechnology

Background:

  • Understanding charge and heat transport in biomaterials is crucial for developing novel electronic devices.
  • DNA's potential as a conductive material is an active area of research.
  • Composite materials offer tunable properties by combining different components.

Purpose of the Study:

  • To investigate the electrical and thermal conduction mechanisms in DNA-gold composites.
  • To determine the dominant conductive pathway within the composite.
  • To elucidate the role of DNA in charge and heat transfer.

Main Methods:

  • Electrical conductivity measurements at room temperature.
  • Thermal conductivity measurements at room temperature.
  • Calculation of the Lorentz number to analyze transport mechanisms.

Main Results:

  • The DNA-gold composite exhibited an electrical conductivity of approximately 14 S/cm.
  • The composite showed a thermal conductivity of about 150 W/(m K) at room temperature.
  • The calculated Lorentz number (3.6 x 10(-4) W ohms/K(2)) suggests phonon-dominated thermal transport in DNA.

Conclusions:

  • Electrical and thermal conduction in the DNA-gold composite are dominated by the DNA component.
  • Molecular vibrations (phonons) play a critical role in both electrical and thermal conduction within DNA molecules.
  • These findings highlight DNA's potential for applications in nanoscale electronics and thermal management.

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