Thermal Conductivity of a Monolayer of Exfoliated Graphite Nanoplatelets Prepared by Liquid-Liquid Interfacial Self-Assembly

الملخص EN

A monolayer film composed of exfoliated graphite nanoplatelets (xGnPs) was extracted from a chloroform-water interface and supported on a glass substrate.

The nanoplatelets are interconnected at the edges without overlapping forming a very densely packed structure with uniform thickness.

Micro-Raman spectroscopy with a 50 mW 532 nm laser generating heat at the center of a xGnP sample was used to probe the thermal conductivity of the xGnP monolayer at different power levels.

The Raman G peak shift of graphite was used to record the local temperature rise in the monolayer.

The cross-sectional area of heat conduction is determined by the thickness of individual nanoplatelets.

A UV-Vis spectrometer was used to measure the absorption of light by the monolayer.

Depending on the interface density, the thermal conductivities are around 380 W/m K and 290 W/m K for monolayers with average particle size of 10 μm and 5 μm, respectively.