title: Palladium-decorated hydrogen-gas sensors using periodically aligned graphene nanoribbons.
abstract: Polymer residue-free graphene nanoribbons (GNRs) of 200 nm width at 1 μm pitch were periodically generated in an area of 1 cm(2) via laser interference lithography using a chromium interlayer prior to photoresist coating. High-quality GNRs were evidenced by atomic force microscopy, micro-Raman spectroscopy, and X-ray photoelectron spectroscopy measurements. Palladium nanoparticles were then deposited on the GNRs as catalysts for sensing hydrogen gases, and the GNR array was utilized as an electrically conductive path with less electrical noise. The palladium-decorated GNR array exhibited a rectangular sensing curve with unprecedented rapid response and recovery properties: 90% response within 60 s at 1000 ppm and 80% recovery within 90 s in nitrogen ambient. In addition, reliable and repeatable sensing behaviors were revealed when the array was exposed to various gas concentrations even at 30 ppm.
authors: School of Materials Science and Engineering and §Advanced Photonics Research Institute, Gwangju Institute of Science and Technology , 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.
authors: Yusin
authors: Y
authors: Pak
authors: Sang-Mook
authors: SM
authors: Kim
authors: Huisu
authors: H
authors: Jeong
authors: Chang Goo
authors: CG
authors: Kang
authors: Jung Su
authors: JS
authors: Park
authors: Hui
authors: H
authors: Song
authors: Ryeri
authors: R
authors: Lee
authors: NoSoung
authors: N
authors: Myoung
authors: Byoung Hun
authors: BH
authors: Lee
authors: Sunae
authors: S
authors: Seo
authors: Jin Tae
authors: JT
authors: Kim
authors: Gun-Young
authors: GY
authors: Jung