Size-dependent joule heating of gold nanoparticles using capacitively coupled radiofrequency fields
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- Moran, C.H., Wainerdi, S.M., Cherukuri, T.K. et al. Nano Res. (2009) 2: 400. doi:10.1007/s12274-009-9048-1
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Capacitively coupled shortwave radiofrequency fields (13.56 MHz) resistively heat low concentrations (∼1 ppm) of gold nanoparticles with a thermal power dissipation of ∼380 kW/g of gold. Smaller diameter gold nanoparticles (< 50 nm) heat at nearly twice the rate of larger diameter gold nanoparticles (≥50 nm), which is attributed to the higher resistivity of smaller gold nanostructures. A Joule heating model has been developed to explain this phenomenon and provides critical insights into the rational design and engineering of nanoscale materials for noninvasive thermal therapy of cancer.