Green synthesis of Bryophyllum pinnatum aqueous leaf extract mediated bio-molecule capped dilute ferromagnetic α-MnO<sub>2</sub> nanoparticles
A. K. M. Atique Ullah, Md. Mahbubul Haque, Mahmuda Akter, Aslam Hossain, Afrin N. Tamanna, Md. Mottaleb Hosen, A.K.M. Fazle Kibria, M. N. I. Khan, Mashooq Khan
Abstract
Abstract Bio-molecule capped α -MnO 2 nanoparticles have been successfully synthesized from the reduction of KMnO 4 via a facile green synthesis route using an aqueous leaf extract of Bryophyllum pinnatum as a reducing and capping agent. The synthesized α -MnO 2 nanoparticles were characterized by x-ray diffraction (XRD), Fourier transform—infrared (FT-IR), energy dispersive x-ray (EDX), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric (TG) and differential scanning calorimetry (DSC) techniques. Experimental results clearly demonstrate the successful synthesis of bio-molecule capped crystalline tetragonal α -MnO 2 nanoparticles with the size of 4–18 nm. The magnetic property of the product was evaluated using a vibrating sample magnetometer (VSM) and the result reveals that the presently synthesized bio-molecule capped α -MnO 2 nanoparticles exhibit ferromagnetic property at room temperature.