Correction: Kaur et al. Nanocomposite of MgFe₂O₄ and Mn₃O₄ as Polyphenol Oxidase Mimic for Sensing of Polyphenols. Biosensors 2022, 12, 428

In the original publication [1], there was an overlay error while combining XRD spectra in Figure 1 and the calculated XRD parameters in Table 1. The corrected Figure 1, along with the XRD discussion and the recalculated XRD parameters in Table 1, are listed below. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.

XRD was used to identify the phase and purity of synthesized NPs and nanocomposites. X-ray diffractograms displayed well-defined peaks (Figure 1), and the XRD parameters are listed in Table 1. The XRD pattern of H-1 NPs exhibited peaks at 2θ = 30.36°, 35.70°, 43.25°, 53.74°, 57.27°, 62.80°, 71.27°, and 74.38° [32,33]. These planes associated with the peaks proved to be strong evidence of the successful synthesis of MgFe₂O₄ (ASTM Data card No.17-465). Moreover, the absence of the extra peaks in the pattern made it evident that MgFe₂O₄ NPs were in a pure phase. The diffraction pattern of H-2 NPs showed sharp peaks at 2θ = 18.03°, 28.96°, 32.38°, 36.11°, 44.42°, 50.82°, 53.77°, 58.55°, 59.98°, and 64.67°, confirming the synthesis of Mn₃O₄ NPs (JCPDS Card No.24-0734). The Scherrer formula was used to recalculate the crystallite size (Table 1) of MgFe₂O₄ and Mn₃O₄, and their corrected values were 32 nm and 15 nm, respectively. The sharp diffraction peaks revealed that the NPs were well crystalline in nature. The combined peaks of H-1 and H-2 NPs were seen in the XRD patterns of H-3 and H-4, thus confirming their presence in the nanocomposite.