科研之友
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摘要
Iron sulfides with different atomic ratios were synthesized by a hydrothermal method and used to modify a glassy carbon electrode. The various sulfides were compared to each other for their amperometric response to H2O2. It is found that FeS is the most adequate material. Operated in 0.1 M NaOH solution at 0.4 V (vs. Ag/AgCl), the sensor based on FeS displays a linear response that extends from 0.50 mu M to 20.5 mM of H2O2, with a sensitivity of 36.4 mu A mM(-1) cm(-2) and a detection limit of 0.15 mu M (at an S/N ratio of 3). The sensor is selective, stable and reproducible.
