Isotope Effect on the Thermal Conductivity of Graphene

<table>Normalized Graphene TC as a function of <svg height="14.75" id="M39" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 22.112499 14.75" width="22.112499" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.75)">
<g transform="translate(72,-60.2)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">C</tspan>
</text>
<text transform="matrix(1,0,0,-1,-63.61,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">1</tspan>
<tspan style="font-size: 8.75px; " x="4.3759999" y="0">3</tspan>
</text>
</g>
</g>
</svg> concentration (a) TC in armchair direction (b) TC in zigzag direction. The inset shows TC as a function of <svg height="14.75" id="M40" style="vertical-align:-3.25793pt" version="1.1" viewbox="0 0 22.112499 14.75" width="22.112499" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.75)">
<g transform="translate(72,-60.2)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">C</tspan>
</text>
<text transform="matrix(1,0,0,-1,-63.61,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">1</tspan>
<tspan style="font-size: 8.75px; " x="4.3759999" y="0">3</tspan>
</text>
</g>
</g>
</svg> for low concentration. The normalizing factors <svg height="10.925" id="M41" style="vertical-align:-3.13504pt" version="1.1" viewbox="0 0 15.5 10.925" width="15.5" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.925)">
<g transform="translate(72,-63.26)">
<text transform="matrix(1,0,0,-1,-71.95,66.44)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜅</tspan>
</text>
<text transform="matrix(1,0,0,-1,-64.52,63.31)">
<tspan style="font-size: 8.75px; " x="0" y="0">x</tspan>
</text>
</g>
</g>
</svg> and <svg height="13.3125" id="M42" style="vertical-align:-5.04861pt" version="1.1" viewbox="0 0 15.5 13.3125" width="15.5" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,13.3125)">
<g transform="translate(72,-61.35)">
<text transform="matrix(1,0,0,-1,-71.95,66.44)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜅</tspan>
</text>
<text transform="matrix(1,0,0,-1,-64.52,63.31)">
<tspan style="font-size: 8.75px; " x="0" y="0">y</tspan>
</text>
</g>
</g>
</svg> are the values for pure graphene, 630 W/mK and 1000 W/mK, respectively.</table>

Journal of Nanomaterials

Isotope Effect on the Thermal Conductivity of Graphene

Figure 4