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As the message says, the mesh volume is too small, ~5e-44m^3. The curved surfaces causes meshing issue and the element volume is too small since your structure is very small. You may still need adjust the mesh, modify the solver error tolerance, limits etc. When it does not converge, the limits should be increased.
As far as I know from some literature, the thermal properties of a material change significantly from bulk to nano scale. They can be 30% of the bulk values at nano scale.
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