Scientists at the University of Hong Kong have reported a discovery that challenges longstanding understanding of diamond’s electrical properties. The research, led by Professor Zhiqin Chu and Professor Yuan Lin, found that specially prepared diamond membranes can produce measurable electrical signals when mechanically deformed, contradicting the prevailing view since the early 1900s that diamond is non-piezoelectric.
The research team employed an edge exfoliation method to create ultrathin, flexible polycrystalline diamond membranes. By reducing diamond to this extremely thin form, the material gained the ability to bend far more than bulk diamond typically can. When researchers deliberately flexed these membranes, stable voltage signals emerged consistently across multiple mechanical cycling tests conducted under controlled laboratory conditions. The team designed their experiments to eliminate alternative explanations, including environmental interference and triboelectric effects that can produce electrical signals through surface contact.
The theoretical analysis indicates that the piezoelectric response originates from asymmetry at grain boundaries within the polycrystalline diamond structure. As the membrane experiences bending stress, electrical charge polarization develops around these boundaries, creating a potential difference between the membrane’s surfaces. This mechanism provides the explanation for the observed voltage generation.
The potential applications extend across several fields. Diamond’s biocompatibility, chemical stability, and non-toxicity position it as a candidate material for advanced medical technologies. Researchers suggest that piezoelectric diamond membranes could power implantable medical devices or function as sensors detecting mechanical stress. Beyond healthcare, the findings could facilitate development of high-reliability microelectromechanical systems and self-powered sensing technologies, transforming diamond from a purely structural material into one with active electrical capabilities.
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