Science Advances

Supplementary Materials

This PDF file includes:

  • Section S1. Optical and AFM images of atomically thin BN samples
  • Section S2. Raman spectra of the suspended 1-3L and bulk BN
  • Section S3. Temperature coefficients of the 1-3L BN suspended over Au/Si substrate
  • Section S4. Absorbance of 1-3L BN measured on quartz
  • Section S5. Laser beam radius
  • Section S6. Error calculation
  • Section S7. Thermal conductivity of graphene as a control
  • Section S8. Thermal equilibration on MD simulations using LAMMPS
  • Section S9. TEC of SiO2/Si substrate simulated by FEM
  • Section S10. Comparison of the TEC of common 2D materials
  • Fig. S1. Characterizations of additional 1-3L BN.
  • Fig. S2. Raman G bands of 1-3L and bulk BN.
  • Fig. S3. Raman G band shifts of 1-3L BN suspended over Au/Si and SiO2/Si as a function of temperature and the corresponding linear fittings.
  • Fig. S4. Laser absorbance of atomically thin BN on quartz.
  • Fig. S5. Transmitted optical intensity of 1L BN.
  • Fig. S6. Raman mapping of Si and corresponding fitting.
  • Fig. S7. The first-order temperature coefficient and thermal conductivity of graphene.
  • Fig. S8. Temperature versus time step for 1L BN.
  • Fig. S9. Strain distribution of SiO2/Si substrate.
  • Table S1. TEC of 2D materials (10−6 K−1).

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