Plasma functionalized MoSe2 for efficient nonenzymatic sensing of hydrogen peroxide in ultra‐wide pH range
Yang Luo,
Donghai Wu,
Zehui Li,
Xiao‐Yan Li,
Yinghong Wu,
Shien‐Ping Feng,
Carlo Menon,
Houyang Chen,
Paul K. Chu
Affiliations
Yang Luo
Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering City University of Hong Kong Hong Kong China
Donghai Wu
Henan Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials Huanghe S & T University Zhengzhou China
Zehui Li
State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, School of Physics Peking University Beijing China
Xiao‐Yan Li
Centre for Water Technology and Policy, Department of Civil Engineering The University of Hong Kong Hong Kong China
Yinghong Wu
Biomedical and Mobile Health Technology Lab, Department of Health Sciences and Technology ETH Zürich Zürich Switzerland
Shien‐Ping Feng
Department of Mechanical Engineering The University of Hong Kong Hong Kong China
Carlo Menon
Biomedical and Mobile Health Technology Lab, Department of Health Sciences and Technology ETH Zürich Zürich Switzerland
Houyang Chen
Department of Chemical and Biological Engineering State University of New York at Buffalo New York USA
Paul K. Chu
Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering City University of Hong Kong Hong Kong China
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 ·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.
