| 초록 |
Development of a high-performance chemical gas sensor is a big challenge in safety issues and diagnosis. Despite significant effort in improving sensitivity and speed, existing sensing materials are still limited based on material properties. Therefore, a new design of sensing material is highly required to overcome limitations: strong binding site, chemical tunability, and porous structure. Herein, for the first time, we demonstrate a novel gas sensing channel based on hydrogen-substituted graphdiyne (HsGDY). In addition to hierarchical nanoporous structure, this HsGDY also has abundant triple bondings which provide strong active site. The HsGDY gas sensor exhibited extraordinary sensing performance with 2 orders of magnitude higher response compared to MoS2, GO, MXene, CNT for various gases. In particular, ultra-high sensitivity for hydrogen gas (ΔR/Rb = 278% against 1% of the hydrogen gas) were achieved with square-like fast response and recovery speed (τ90 = 9 sec and τ10 = 38 sec toward 1% of H2), far exceeding 2D material-based gas sensors. We believe that this carbon-rich framework could open up an approach to develop high performance chemical gas sensor. |
