| 초록 |
Oxalic acid (OA) exists widely in plants, animals and microbes. It is ingested as a dietary constituent or produced as the final product of amino acid and ascorbic acid metabolism. Its sensing is important since it may react with the human body metals such as Ca, Fe, Na, Mg, Zn etc. and leads to the formation of less soluble salt and hence it contributes to the formation of kidney stones. In this study, a nanohybrid of gold nanoparticle, polypyrrole, and reduced graphene oxide (Au/PPy/rGO) was prepared by an in-situ chemical synthesis approach. The as-prepared nanohybrid has been applied for non-enzymatic electrochemical detection of oxalic acid in 0.1 M H2SO4 as electrolyte. The modified electrode showed a wider linear range (0.05mM to 7mM) with a lower detection limit of 0.02 mM. The experimental results also showed that the sensor has good reproducibility (R.S.D = 2.59% for 0.5mM, n = 3), high sensitivity of 91 μA/mM and good stability as well. |
