POS5-1389

Mechanism Transition of Polymer-Sorted Single-Walled Carbon Nanotube/Pd Nanoparticle Networks for Wafer-Scale, Reliable Hydrogen Sensing

When and Where

Nov 30, -0001 00:00 - 00:00

Presenter(s)

Minjae Choi (POSTECH)

Co-Author(s)

Yong-Young Noh (POSTECH), Gi-Seong Ryu (POSTECH)

Abstract

As hydrogen emerges as a clean energy carrier, its high flammability necessitates rapid and highly reliable detection, especially near the 4% explosive limit in air

. In this work, we demonstrate a high-performance hydrogen sensor utilizing polymer-sorted semiconducting single-walled carbon nanotubes (sc-SWCNTs) decorated with thermally evaporated palladium nanoparticles (Pd NPs)

. The sc-SWCNT network acts as an efficient charge transport channel and directs the spatial distribution of Pd NPs to form an optimized catalytic interface

. The sensor achieves stable, concentration-dependent responses over a wide range (1% to 20%), yielding remarkable sensitivities of 881 and 876 at 4% H₂ during consecutive 10-minute exposure cycles, combined with an ultra-fast response time of approximately 1 s

. High sensitivity is maintained down to 10 ppm H₂ confirming a wide dynamic range

. For large-area scalability, 156 sensors were fabricated in a single process on a 6-inch wafer

. These devices show exceptional uniformity, consistent with single-device performance, yielding an average sensitivity of

645.29 pm 4.58

. Crucially, systematic modulation of the SWCNT network density and Pd thickness reveals a clear transition in the sensing mechanism: a shift from SWCNT-dominated charge transport to metallic Pd percolation pathways. This work offers a highly reproducible and cost-effective platform for mass-producing high-performance hydrogen sensors, paving the way for practical safety monitoring

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