DSC-50Q (Shimadzu, Kioto, Japan) operating between 30 and 950 ◦C (ramp 20 ◦C/min) at an intensity of 50 A. N2 gas adsorption–desorption isotherms were performed using a Micromeritics ASAP 2020 analyzer (Micromeritics, Norcross, GA, USA). Conventional transmission electron microscopy (...