| Autor: |
Mani, Veerappan, Selvaraj, Shanthi, Tie-Kun Peng, Hsin-Yi Lin, Jeromiyas, Nithiya, Hiroya Ikeda, Yasuhiro Hayakawa, Suru Ponnusamy, Muthamizhchelvan, Chellamuthu, Sheng-Tung Huang |
| Zdroj: |
ACS Applied Nano Materials; 8/23/2020, Vol. 2 Issue 8, p5049-5060, 12p |
| Abstrakt: |
A robust real-time quantification method is essential to understand the physiological roles of endogenous H2O2 in biological systems. For this purpose, we described a binary transition-metal oxide (TMO)-based nanointerface, i.e., spinal zinc cobaltite/cobalt oxide ternary nanoarrays (ZnCo2O4/Co3 O4) on a Cu foam (CF). The ZnCo2O4/Co3O 4/CF facilitates H2O2 reduction at a minimized overpotential (-0.10 V vs Ag/AgCl). which is several millivolts away from the voltammetric regions of common biological and oxygen interferences, making the electrode highly selective in the presence of 5-fold excess concentrations of biological species. In the presence of ZnCo2O4, the electrocatalytic capability of Co3O4 has increased significantly by enlarging the electrochemical active area of the electrode (0.538 cm²). A substantial improvement in the stability (97.24%) and reproducibility (relative standard deviation = 3.14%) are attained because the direct growth of nanomaterials is generated on CF in close proximity with the electrode surface and strengthens the affinity. The modified electrode endows ultrasensitivity (detection limit = 1 nM) and quantifies the amount of H2O2 released from mammalian cells (8.7 x 10-14 mol). Binary TMOs hold promise in tailoring a reliable H2O2-detecting interface for real-time, in vivo applications. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
