This PDF file includes:

• fig. S1. Optical microscopic image of the as-fabricated double-clamped BLG device.
  
• fig. S2. Measurement showing BLG pulled into the bottom electrode.
  
• fig. S3. Relative changes in the resistance response of BLG plotted in Fig. 2B.
  
• fig. S4. Additional measurements of the resistance time revolution of current annealing regenerated the suspended BLG.
  
• fig. S5. Gate modulation of an additional suspended BLG in a CO₂ environment.
  
• fig. S6. Simulated charge density difference distribution in freestanding BLG, with one CO₂ adsorption event occurring in a large supercell.
  
• fig. S7. Model used in semiempirical molecular dynamics simulations.
  
• DFT calculations with vdW correction.
  
• References (32, 33)

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