Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8959883 | Journal of Electroanalytical Chemistry | 2018 | 24 Pages |
Abstract
Few layered graphene nanosheets were successfully doped with nitrogen through microwave irradiation and thoroughly characterized by using electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The electrochemical efficiency of N-doped graphene toward enzyme-free detection of uric acid (UA) and dopamine (DA) at neutral pH (7.4) was studied by chronoamperometry and cyclic voltammetry measurements. At working potential of +0.3â¯V (vs. Ag/AgCl), N-doped graphene electrode revealed ultra-high sensitivity of 2.06â¯mAâ¯mMâ1â¯cmâ2 and low limit of detection (LOD) of 0.13â¯Î¼M within a concentration range of 0 to 0.6â¯mM for UA detection. Also, at very higher potential of +1.8â¯V (vs. Ag/AgCl), N-doped graphene sensor exhibited a highly selective response toward DA with very low LOD of 4.5â¯nM and high sensitivity of 7.63â¯mAâ¯mMâ1â¯cmâ2 in a broad linear concentration range from 0.1 to 100â¯Î¼M. Furthermore, the performance of UA and DA sensors in the real blood sample was satisfactory.
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Authors
Faranak Foroughi, Mansour Rahsepar, Hasuck Kim,