Supplementary Materials

This PDF file includes:

  • note S1. Analytical model for mass effect on acceleration.
  • note S2. Effect of low-modulus device substrate.
  • fig. S1. Device design and circuit layouts.
  • fig. S2. Computed x-ray tomography images of the internal structures of the accelerometer chip.
  • fig. S3. Schematic illustration of capacitive ECG electrodes and demonstrations of their reusability.
  • fig. S4. Adhesion strength of Silbione to the skin and dependence of its thickness on spin speed.
  • fig. S5. Measurements of water vapor transmission loss.
  • fig. S6. Cell viability assay and cytotoxicity test.
  • fig. S7. Mechanical simulation of the circuit interconnects during biaxial stretching.
  • fig. S8. Stress-strain response of the device.
  • fig. S9. Vibration response of the accelerometer chip without analog filters.
  • fig. S10. Comparison of experimental and simulation results on the effect of mass, tissue thickness, and signal frequency on measurement response.
  • fig. S11. Schematic illustration and measurement results of the vibration model to capture the effects of device modulus.
  • fig. S12. Application of an epidermal mechano-acoustic–electrophysiological device on the neck.
  • fig. S13. Echocardiogram characterization results on a patient with tricuspid and pulmonary regurgitation.
  • fig. S14. Acoustic signals from aortic, pulmonary, tricuspid, and mitral sites of a patient with irregular heartbeat.
  • fig. S15. Experiment on LVAD pump thrombosis.
  • fig. S16. Data captured using a reported device and a commercial microphone in quiet and noisy environments.
  • fig. S17. Process loop for a speech-based human-machine interface.
  • fig. S18. Demonstration of noise reduction in time domain speech data.
  • fig. S19. Authentication application.
  • fig. S20. Wireless sensing of BioStamp.
  • Legends for movies S1 to S3

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Other Supplementary Material for this manuscript includes the following:

  • movie S1 avi movie S1 .mp4 (.avi and .mp4 format). Movie of speech recording in a quiet environment.
  • movie S2 avi movie S2 mp4 (.avi and .mp4 format). Movie of speech recording in a noisy environment.
  • movie S3 avi movie S3 wmv (.avi and wmv format). Movie of speech recognition and voice control of a Pac-Man game with real-time machine learning and signal classification.

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