DGIST researchers grew vertically oriented graphene nanowalls directly on heat-resistant polymer nanomeshes to trap gas molecules longer, increasing interaction time and surface area without sacrificing flexibility or air permeability for wearable mask sensors.
Direct growth of graphene nanowalls on polymer nanofiber nanomeshes increases accessible sensing surface area while preserving flexibility and breathability.
Vertically oriented graphene nanowalls create narrow gaps that prolong residence time of gas molecules, raising collision rates and interactions with the sensing surface.
Low-temperature plasma CVD onto heat-resistant nanofibers allowed formation of the nano-on-nano structure without deforming the polymer scaffold.
# What the team built Researchers led by Professor Sungwon Lee at DGIST developed a hierarchical "nano-on-nano" sensing structure by growing graphene nanowalls (GNWs) directly on a three-dimensional polymer nanofiber nanomesh. The aim was to combine the high surface area and edge-rich chemistry of vertically oriented graphene with the breathability and flexibility required for wearable sensors that must contact skin or integrate with masks.
# Why this matters for wearable gas sensors Wearable gas sensors must be lightweight, flexible, and breathable for extended wear, yet sensitive enough to detect trace gases at room temperature. Typical polymer nanomeshes provide breathability and mechanical compliance but offer limited surface functionality. Conventional methods for producing functional carbon nanomaterials like graphene usually require high temperatures that damage polymer substrates, or they rely on transfer steps that produce planar films rather than three-dimensional structures.
# How they made the structure The team used heat-resistant polymer nanofibers as the nanomesh scaffold and applied low-temperature plasma chemical vapor deposition (CVD) to grow vertically oriented graphene nanowalls along the fiber surfaces. The process preserved the morphology of the nanofibers, yielding a true 3D-on-3D architecture: a nanowall-covered nanomesh rather than a flat graphene layer on top of a polymer film.
# What changes in gas behavior Within the hierarchical graphene nanowall array, gas-transport simulations and experiments showed that gas molecules take more convoluted paths and undergo more local collisions. The narrow gaps between nanowalls lead to a confinement effect: molecules spend more time within the sensing region, increasing the probability of interaction with graphene surfaces. This mechanism improves sensing performance beyond a simple increase in surface area.
# Demonstration on a wearable platform The researchers integrated the GNW-nanomesh into a wearable mask platform and confirmed it supports long-term gas monitoring while keeping high breathability and flexibility—properties essential for continuous wearable use. The work was published in Advanced Fiber Materials under the title "Hierarchical Graphene Nanowall Nanomesh Enables Confinement-Enhanced Gas Sensing for Wearable Applications."
# Practical implications and next steps
# Bottom line Directly grown graphene nanowalls on polymer nanomeshes increase interaction time and surface area for gas molecules, offering a pathway to more sensitive, breathable, and flexible wearable gas sensors compatible with mask integration and long-term monitoring.
Researchers at the Daegu Gyeongbuk Institute of Science and Technology (DGIST), Hanbat National University, Chungnam National University, the Korea Institute of Industrial Technology, Kyungpook National University, and the Gumi Electronics and Information Technology Research Institute (GERI) have developed a hierarchic
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