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<p>Ultrathin freestanding carbon nanomembranes enable applications ranging from electron microscopy to high-field laser-plasma experiments, yet deployment is limited by low release yield, transfer damage, and contamination from polymer supports or wet processing. Here we introduce an interfacial design strategy enabling clean, reproducible release of 10–100 nm amorphous carbon foils with high-release reproducibility across millimeter-scale apertures. Carbon films are grown on water-soluble NaCl templates and released in a water-alcohol bath, tuned to control interfacial wetting through substrate roughness and surface tension. The membranes exhibit an effective mass density of ~1 g cm<sup>−3</sup> and an apparent modulus of 0.18 GPa, enabling robust handling without additional carrier layers. We identify wetting-mediated release regimes from rapid lift-off to air-trapping delays. As laser-plasma targets, the membranes generate broader accelerated particle divergence than aluminum or polymer films. This approach supports high-throughput fabrication and integration at scale and provides an ultraclean route to high-integrity nanomembranes for extreme-field and precision technologies.</p>

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Interfacial design enables self-release of ultrathin freestanding carbon membranes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月14日

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  • Alexandra Palla-Papavlu,
  • Antoniu Moldovan,
  • Anca Bonciu,
  • Veronica Sătulu,
  • Valentin Ion,
  • Iuliana Urzică,
  • Daniel Dorobanțu,
  • Cristina Marin,
  • Petru Ghenuche,
  • Robbie Wilson,
  • Paul McKenna,
  • Domenico Doria,
  • Victor Malka,
  • Mihail Octavian Cernăianu

摘要

Ultrathin freestanding carbon nanomembranes enable applications ranging from electron microscopy to high-field laser-plasma experiments, yet deployment is limited by low release yield, transfer damage, and contamination from polymer supports or wet processing. Here we introduce an interfacial design strategy enabling clean, reproducible release of 10–100 nm amorphous carbon foils with high-release reproducibility across millimeter-scale apertures. Carbon films are grown on water-soluble NaCl templates and released in a water-alcohol bath, tuned to control interfacial wetting through substrate roughness and surface tension. The membranes exhibit an effective mass density of ~1 g cm−3 and an apparent modulus of 0.18 GPa, enabling robust handling without additional carrier layers. We identify wetting-mediated release regimes from rapid lift-off to air-trapping delays. As laser-plasma targets, the membranes generate broader accelerated particle divergence than aluminum or polymer films. This approach supports high-throughput fabrication and integration at scale and provides an ultraclean route to high-integrity nanomembranes for extreme-field and precision technologies.