Fe3O4@MnO2 nanoparticles with strong oxidase-like activity and high efficiency are synthesized.These nanoparticles have a number of benefits,including stability and easily manufacturing.Combined with the enzyme inhibition of phenolics,a straightforward,quick,and obvious temperature detection approach is constructed for phenolics,making up for the drawbacks of the conventional detection methods.Fe3O4@MnO2 nanoparticles may quickly catalyze the dissolved oxygen to produce reactive oxygen free radicals,therefore catalyzes the chromogenic reaction of TMB,a colorless substrate.This reaction will result in noticeable temperature increase when it is exposed to an 808 nm laser.It is shown through further study that the addition of phenolics leads to a significant weakening in color change,as well as a decrease in temperature change,allowing for the precise identification of phenolics.Under the optimal conditions,there is a linear relationship between temperature change and phenolic concentration within the range of 0-100 µmol·L-1,along with a detection limit of 2.67 μmol·L-1.This approach is resistant to other organic compounds with comparable structure.It has the advantages such as good sensitivity,strong anti-interference ability,easily operating,simple instrumentation,and so on,and it has a promising prospect in phenolics detection.
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