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Hierarchical Graphene Nanowall Nanomesh Enables Confinement-Enhanced Gas Sensing for Wearable Applications
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DOI：10.1007/s42765-026-00752-9.png)
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Abstract
En 中文
Wearable gas sensors are essential for real-time monitoring of personal exposure, yet achieving high sensitivity at room temperature while maintaining mechanical compliance remains a significant challenge. Here, we report a hierarchical graphene nanowall (GNW) nanomesh that integrates material-specific transport characteristics with a three-dimensional (3D) porous architecture for enhanced gas-sensing performance. The GNW nanomesh is realized by directly growing vertically oriented graphene nanowalls on a flexible polymer nanomesh using a low-temperature plasma-enhanced chemical vapor deposition process enabled by a thermally robust parylene-coated polyimide substrate. The resulting 3D-on-3D architecture provides high accessibility of active sites and mechanically compliant pathways suitable for wearable applications. Compared to planar GNWs, the hierarchical nanomesh exhibits a sixfold enhancement in sensitivity and faster response under room-temperature operation. Particle-based simulations suggest that confined geometries within GNWs promote localized molecular trajectories and increased collision events, consistent with the observed performance enhancement. Integration into a wearable smart mask further demonstrates stable real-time detection of NO2 over extended operation. This work highlights that combining intrinsic material transport characteristics with hierarchical nanoarchitectural design offers an effective strategy for advancing wearable gas sensing beyond conventional surface-area-driven approaches.
Keywords:
Graphene nanowall nanomesh
Hierarchical nanoarchitecture
Gas sensing
Wearable sensors
Confinement effects
Molecular transport
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21.3
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674
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6.6K
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