Plasma functionalized MoSe2 for efficient nonenzymatic sensing of hydrogen peroxide in ultra-wide pH range
Abstract
Enzymatic sensors have inherent problems such as the low stability and limited pH range in industrial and biomedical applications and therefore, more efficient nonenzymatic sensors are highly desirable. Herein, plasma-functionalized defective MoSe2 is prepared and studied as a highly efficient catalyst for electrochemical sensing of H2O2. Experiments and theoretical computations show that the plasma-induced Se multi-vacancies and nitrogen dopants generate new active sites, expose more edge active surfaces, narrow the bandgap, and strengthen binding with the center dot OH intermediate, which imparts new fundamental knowledge about the roles of defects in catalysis. The defective MoSe2-catalyzed sensor delivers competitive performance in hydrogen peroxide detection such as a low detection limit of 12.6 nmol/L, wide operational pH range of 1-13, good long-term stability, and high selectivity. The portable sensor produced by screen printing confirms the excellent commercial potential and in addition, the results not only reveal a novel concept to design and fabricate high-performance sensors for H2O2 but also provide insights into the effectiveness of surface modification of diverse catalytic materials. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000568459Publication status
publishedExternal links
Journal / series
SmartMatVolume
Pages / Article No.
Publisher
WileySubject
MoSe2; plasma functionalization; electrochemical sensors; hydrogen peroxides; portable devicesOrganisational unit
09715 - Menon, Carlo / Menon, Carlo
More
Show all metadata