A colorimetric and electrochemical dual-mode Hg2+ sensor utilizing oxidase-like activity arising from the combination of Hg2+ and palladium metal-organic framework@graphene

Developing convenient and reliable methods for Hg 2+ monitoring is highly important. Some precious metal nanomaterials with intriguing peroxidase-like activity have been used for highly sensitive Hg 2+ detection. However, H 2 O 2 must be added during these detections, which impedes practical applica...

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Bibliographic Details
Published in:Mikrochimica acta (1966) 2024-06, Vol.191 (6), p.352-352, Article 352
Main Authors: Liu, Zhiguang, Niu, Ruxia, Li, Miaomiao, Li, Zhiping, Guo, Yujing
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemical sensors
Chemistry
Chemistry and Materials Science
Colorimetry
Electrical measurement
Environmental monitoring
Graphene
Hydrogen peroxide
Mercury (metal)
Metal-organic frameworks
Microengineering
Nanochemistry
Nanomaterials
Nanotechnology
Original Paper
Oxidase
Oxidation
Palladium
Peroxidase
Phenylenediamine
Sensors
Substrates
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Summary:Developing convenient and reliable methods for Hg 2+ monitoring is highly important. Some precious metal nanomaterials with intriguing peroxidase-like activity have been used for highly sensitive Hg 2+ detection. However, H 2 O 2 must be added during these detections, which impedes practical applications of Hg 2+ sensors due to its susceptible decomposition by environmental factors. Herein, we discovered that the combination of Hg 2+ and palladium metal-organic framework@graphene (Pd-MOF@GNs) exhibits oxidase-like activity (OXD). In the absence of H 2 O 2 , this activity not only catalyzes the oxidation of chromogenic substrates such as 3,3',5,5'-tetramethylbenzidine (TMB) or o-phenylenediamine (OPD) to produce a color change but also enhances the electrical signals during OPD oxidation. Based on these properties, an effective and convenient dual-mode colorimetric and electrochemical sensor for Hg 2+ has been developed. The colorimetric and amperometric linear relationships for Hg 2+ were 0.045 μM—0.25 mM and 0.020 μM—2.0 mM, respectively. The proposed strategy shows good recovery in real sample tests, indicating promising prospects for multiple environmental sample detection of Hg 2+ without relying on H 2 O 2 . The colorimetric and electrochemical dual-mode Hg 2+ sensor is expected to hold great potentials in applications such as environmental monitoring, rapid field detection, and integration into smartphone detection of Hg 2+ . Graphical abstract
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-024-06438-6