Absorption Cross Section and Interfacial Thermal Conductance from an Individual Optically Excited Single-Walled Carbon Nanotube

作者：Wang Dan; Carlson Michael T; Richardson Hugh H^*

来源：ACS Nano, 2011, 5(9): 7391-7396.

DOI：10.1021/nn202327n

• heat generation
• single-walled carbon nanotubes
• absorption cross section
• interfacial thermal conductance

The heat generation and dissipation of an individual optically excited metallic single-walled carbon nanotube is characterized using a thermal sensor thin film of Al0.94Ga0.06N embedded with Er3+. The absorption cross section from an individual SWCNT excited at 532 nm is revealed from the steady-state temperature of the thermal sensor film. A maximum temperature of 4.3 K is observed when the SWCNT is excited with parallel polarization and an average intensity of 7 x 10(10) W/m(2). From this temperature measurement, we determine an absorption cross section for the SWCNT of 9.4 x 10(-17) m(2)/mu m using parallel polarization and 2.4 x 10(-17) m(2)/mu m for perpendicular polarization. We establish a temperature difference between the SWCNT and the substrate of 315 K by converting the G band shift of the SWCNT into the local SWCNT temperature. and scaling the measured film temperature to the local non-resolution-limited temperature rise. From the temperature difference and heat flux, we deduce a value of 6.6 MW/m(2) . K for the thermal interfacial conductance of a SWCNT sitting on a thin film of amorphous Al0.94Ga0.06N.

• 出版日期2011-9