Fig. 2: Structure characterization of TNO and HG-TNO-3.

TEM image (a) and HRTEM image (b) of HG-TNO-3. c Raman spectra and d nitrogen adsorption–desorption isotherms of TNO and HG-TNO-3

TEM image (a) and HRTEM image (b) of HG-TNO-3. c Raman spectra and d nitrogen adsorption–desorption isotherms of TNO and HG-TNO-3