Fig. 2: Electron microscopy and X-ray absorption spectroscopy for ZrO2 catalyst characterization.
From: Ultrasmall amorphous zirconia nanoparticles catalyse polyolefin hydrogenolysis
a,b, Low-magnification (a) and high-magnification (b) high-angle annular dark-field (HAADF) STEM images of L-ZrO2@mSiO2. Inset in a, selected area electron diffraction pattern. c,d, Low-magnification (c) and high-resolution (d) HAADF STEM images of the cross-section of an L-ZrO2@mSiO2 particle prepared by microtomy. e,f, High-magnification HAADF STEM image (e) and corresponding energy dispersive X-ray spectroscopy elemental (top left, Si and Zr; top right, Si; bottom left, O; bottom right, Zr) maps (f) of the cross-section of an L-ZrO2@mSiO2 particle. g,h, Normalized Zr k-edge X-ray absorption near-edge structure spectra (g) and k2-weighted EXAFS spectra (h) of L-ZrO2@mSiO2 and control samples. Inset in g, first derivative spectra.
