Spherical MnFe2O4 and MnFe2O4@YPO4:5 Eu3+ magnetic nanoparticles have been prepared by co‐precipitation method. Crystal structure, morphology, elemental composition and surface structure were characterised by X‐ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and Infra‐red spectroscopy (IR). Their calculated average crystallite sizes are found to be 28 and 35 nm respectively. And the prepared nanoparticles are having spherical morphology. The composite bond formation between MnFe2O4 and YPO4:5 Eu3+ is confirmed by more intense bending vibrations of PO43− group for hybrid nanoparticles. The magnetization of hybrid nanoparticles shows magnetization per gram of MnFe2O4, Ms= 34.355 emu/g with negligible coercivity indicating superparamagnetic behaviour. Prepared magnetic nanoparticles achieve hyperthermia temperature (42 °C to 47 °C) under AC magnetic field indicating potential material for biological application. The prepared nanoparticles are showing red luminescence peaks at 615 nm and 702 nm, which are included in the range of biological window.

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A rational, simple convenient green aqueous methodology is described for sustainable fabrication of ultrasmall platinum nanoparticles (Pt NPs) by exploiting the phytochemicals present in M. pudica leaves extract as both a reducing agent as well as a stabilizing agent. Transmission electron microscopy analysis confirms the formation of ultrasmall spherical Pt NPs with a narrow size distribution and an average diameter of ∼1.4 nm. The ensuing Pt NPs displayed significant direct aqueous phase conversion of glucose to levulinic acid and formic acid selectively under mild conditions and a lack of auxiliaries. An increase in the yield of levulinic acid with increases in temperature was also proposed. In addition, excellent catalytic decomposition of hydrogen peroxide by the as-synthesized Pt NPs is well-ascertained. The particle demonstrates peroxidase mimicking nanozyme behavior. Our work provides an alternative podium of environmentally friendly clean energy production and a novel chemopreventive agent for biomedical purposes.