Fig. 1
From: Mapping surface-modified titania nanoparticles with implications for activity and facet control
TEM images of as-prepared TiO2 samples and corresponding 31P MAS NMR spectra of TMP-adsorbed samples. TEM images of as-prepared a powder (PD), c F-(101), e F-(001) and b, d, f their corresponding spectra of TMP-adsorbed samples. Green represents TMP of surface 5-coordinate Ti4+ on (101) facet (i.e., Ti5C(101)), blue represents TMP of 5-coordinate Ti4+ on (001) facet (i.e., Ti5C(001)), orange represents TMP of surface Ti4+ containing OH and F and pink represents TMP on Brønsted acid site (TiO(H)-Ti). The F-(001) sample clearly show a higher coverage of (001) facet reflected by the largest corresponding 31P chemical shift of blue peak (cf., green peak); while F-(101) with higher coverage of (101) facet and PD with the highest coverage of (101) facet both show a dominant green peak. See NMR spectrum deconvolution section in Experimental section for details. The scale bar in all images is 5 nm
