Oxygen Gas Assisted Laser Deposition of Gold Thin Films: Electrooxidation of Glucose

摘要

Gold thin films were deposited onto carbon nanotubes by pulsed laser deposition in presence ofmoderate O2 pressures of 10 and 50 mTorr. Structural analysis of the deposited films conducted bymeans of X-ray diffraction and X-ray photoelectron spectroscopy analyses did not reveal the formationof gold oxide. The electrocatalytic properties of thus synthesized Au thin films were evaluated towardsglucose oxidation by cyclic voltammetry, chronoamperometry and square-wave voltammetry. Withinthe deposited samples, Au thin film fabricated with 50000 laser pulses in presence of 10 mTorr of O22 displayed a very high electroactive surface area of 16.4 cm . At this electrode, the highest sensitivity of-2 -1 43.6 cm mM up to 20 mM, and a detection limit of at 0.01 mM were obtained by square-wavevoltammetry in phosphate buffer saline (PBS, pH 7.2) solution containing concentrations of glucoseranging from 0.01 mM to 100 mM. These results are better than those delivered by Au thin filmssynthesized under vacuum or inert gas atmosphere.