title: Porous palladium coated conducting polymer nanoparticles for ultrasensitive hydrogen sensors.
abstract: Hydrogen, a clean-burning fuel, is of key importance to various industrial applications, including fuel cells and in the aerospace and automotive industries. However, hydrogen gas is odorless, colorless, and highly flammable; thus appropriate safety protocol implementation and monitoring are essential. Highly sensitive hydrogen leak detection and surveillance sensor systems are needed; additionally, the ability to maintain uniformity through repetitive hydrogen sensing is becoming increasingly important. In this report, we detail the fabrication of porous palladium coated conducting polymer (3-carboxylate polypyrrole) nanoparticles (Pd@CPPys) to detect hydrogen gas. The Pd@CPPys are produced by means of facile alkyl functionalization and chemical reduction of a pristine 3-carboxylate polypyrrole nanoparticle-contained palladium precursor (PdCl(2)) solution. The resulting Pd@CPPy-based sensor electrode exhibits ultrahigh sensitivity (0.1 ppm) and stability toward hydrogen gas at room temperature due to the palladium sensing layer.
authors.affiliation: School of Chemical and Biological Engineering, College of Engineering, Seoul National University, 599 Gwanangno, Gwanakgu, Seoul, 151-742, Korea. jsjang@plaza.snu.ac.kr.
authors.forename: Jun Seop
authors.initials: JS
authors.lastname: Lee
authors.forename: Sung Gun
authors.initials: SG
authors.lastname: Kim
authors.forename: Sunghun
authors.initials: S
authors.lastname: Cho
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang