2023
DOI: 10.1021/acs.est.2c07899
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Engineering an Enzymatic Cascade Catalytic Smartphone-Based Sensor for Onsite Visual Ratiometric Fluorescence–Colorimetric Dual-Mode Detection of Methyl Mercaptan

Abstract: Precise and reliable onsite detection of methyl mercaptan (CH 3 SH) is of great significance for environmental surveillance. Here, we synthesized a novel blue fluorescence nanozyme CeO 2 @TPE with high peroxidase-like activity by employing aggregation-induced emission (AIE) tetraphenylethene (TPE) to embed into hollow CeO 2 nanospheres. In the presence of ethanol oxidase (AOX) and o-phenylenediamine (OPD), we engineered an enzymatic cascade activation ratiometric fluorescence−colorimetric dual-mode system AOX/… Show more

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Cited by 83 publications
(25 citation statements)
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“…Characterization and Analysis of the Fe@CeO 2 Nanozyme. By referring to the previous report, 27 the mesoporous CeO 2 nanosphere with peroxidase-like activity was first synthesized to be employed as the scaffolding for next embedding ferrocenecarboxylic acid (Fc) to further improve peroxidase-like activity, obtaining the Fe@CeO 2 nanozyme with bimetallic synergistically catalyzed sites. The TEM, elemental mapping images, and energy dispersive spectroscopy (EDX) and XPS analyses demonstrated that the mesoporous CeO 2 nanosphere was successfully synthesized by mainly composing of Ce with O elements (Figures S1 and S2), which exhibited a pore size of 8.80 nm, a total pore volume of 0.14 cm 3 /g, and a specific surface area of 65.62 m 2 /g by performing the N 2 adsorption isotherm analysis (Figure S3).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Characterization and Analysis of the Fe@CeO 2 Nanozyme. By referring to the previous report, 27 the mesoporous CeO 2 nanosphere with peroxidase-like activity was first synthesized to be employed as the scaffolding for next embedding ferrocenecarboxylic acid (Fc) to further improve peroxidase-like activity, obtaining the Fe@CeO 2 nanozyme with bimetallic synergistically catalyzed sites. The TEM, elemental mapping images, and energy dispersive spectroscopy (EDX) and XPS analyses demonstrated that the mesoporous CeO 2 nanosphere was successfully synthesized by mainly composing of Ce with O elements (Figures S1 and S2), which exhibited a pore size of 8.80 nm, a total pore volume of 0.14 cm 3 /g, and a specific surface area of 65.62 m 2 /g by performing the N 2 adsorption isotherm analysis (Figure S3).…”
Section: Resultsmentioning
confidence: 99%
“…The CeO 2 nanosphere was prepared with reference to the previous literature and slightly modified. 27 First, 0.1 g of poly(ethylene glycol) was mixed with 0.35 mL of ammonia; then, 37.0 mL of water and 8.0 mL of ethanol were added, and the mixed solution was placed in a brown vial and stirred with a magnetic stirrer for 1.0 h. This was followed by the addition of 8.0 mL of a 25.0 mg/mL solution of tannic acid. After 5.0 min of reaction at room temperature, 0.38 mL of a 37.0 wt % formaldehyde solution was added and stirred for 24.0 h with a magnetic stirrer.…”
Section: Introductionmentioning
confidence: 99%
“…Nanozymes form a class of multifunctional material that combines the properties of nanomaterials with catalytic ability, mimicking natural enzymes, , and making it shine in the application of colorimetric analyses. Up to now, a variety of nanozymes including Au, Pd, Pt, MnO 2 , and MoS 2 nanosheets have been wildly explored for Hg 2+ colorimetric detection . Although some accomplishments have been achieved, a higher degree of sensitivity and selectivity of the sensors are required as the research progresses.…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, the reported nanozyme-based dual-readout strategies are mainly achieved by two pathways: On the one hand, some dual-mode sensing methods rely on a single signal, which is determined by multiple detection methods. For example, in addition to the usual UV–vis spectroscopic measurement, the typical TMBox (oxidized TMB) signal from nanozyme catalysis can further be converted into other measurement modes, like fluorescence, photothermal, and electrical signals. This pathway still does not avoid false positive/negative results; on the other hand, the implementation of other dual-mode measurements usually requires additional probes such as fluorescent substrates, nanoclusters, and quantum dots, increasing detection complexity and leading to potential interference. Instead, developing multifunctional nanozymes offers a new option to eliminate the above restrictions of nanozyme-based multimode sensors, where the enzyme-like activity and other physicochemical properties are well integrated . As a result, except for the usual colorimetric signal, other types of signals can also be generated by interactions between targets and nanozymes.…”
Section: Introductionmentioning
confidence: 99%