TY - JOUR
T1 - Anti-Poisoning Electrode for Real-Time In-Situ Monitoring of Hydrogen Sulfide Release
AU - Jeromiyas, Nithiya
AU - Mani, Veerappan
AU - Chang, Pu-Chieh
AU - Huang, Chih-Hung
AU - Salama, Khaled N.
AU - Huang, Sheng-Tung
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Ministry of Science and Technology (MOST; 107-2113-M-027-007 – and 108-2221-E-027-063–) Taiwan (ROC) and King Abdullah University of Science and Technology (KAUST), Saudi Arabia.
PY - 2020/9/6
Y1 - 2020/9/6
N2 - Electrode poisoning and interferences from complex biological environments are major challenges in the development of in-situ H2S sensors. To circumvent these issues, herein a robust electrode based on reduced graphene oxide-molybdenum disulfide nanohybrid (RGO-MoS2) and polymerized o-phenylenediamine (POPD) is developed. The POPD/RGO-MoS2-modified electrode catalyzed H2S oxidation at a minimized overpotential (+ 0.15 V vs. Ag/AgCl). A new strategy based on inherent material properties was implemented to alleviate the electrode-poisoning problem. The nano-tailored interface blocks 2.5-fold surplus levels of interferences because of its exclusive size-exclusion property and electrostatic interactions. Moreover, this method with a response time of fewer than 5 s displayed a detection limit of 10 nM, which covers the endogenous H2S levels. Practicality tests in various biological media yielded valuable recoveries of 96.4–97.8%. The amounts of H2S released from the bacterial cells were quantified in real-time over a continuous time span of 5 h.
AB - Electrode poisoning and interferences from complex biological environments are major challenges in the development of in-situ H2S sensors. To circumvent these issues, herein a robust electrode based on reduced graphene oxide-molybdenum disulfide nanohybrid (RGO-MoS2) and polymerized o-phenylenediamine (POPD) is developed. The POPD/RGO-MoS2-modified electrode catalyzed H2S oxidation at a minimized overpotential (+ 0.15 V vs. Ag/AgCl). A new strategy based on inherent material properties was implemented to alleviate the electrode-poisoning problem. The nano-tailored interface blocks 2.5-fold surplus levels of interferences because of its exclusive size-exclusion property and electrostatic interactions. Moreover, this method with a response time of fewer than 5 s displayed a detection limit of 10 nM, which covers the endogenous H2S levels. Practicality tests in various biological media yielded valuable recoveries of 96.4–97.8%. The amounts of H2S released from the bacterial cells were quantified in real-time over a continuous time span of 5 h.
UR - http://hdl.handle.net/10754/665046
UR - https://linkinghub.elsevier.com/retrieve/pii/S0925400520311916
U2 - 10.1016/j.snb.2020.128844
DO - 10.1016/j.snb.2020.128844
M3 - Article
SN - 0925-4005
SP - 128844
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -