Figure 2
High resolution X-ray Photoelectron Spectroscopy (XPS) of LLM 105 collected in the N 1s region.
(a) N 1s XPS spectrum of nanosheets supported on HOPG substrate. The spot size was 0.5 mm and scan number is 10, The spectrum is fit with six components at 406.7, 405.8, 405.1, 402.4, 399.7 and 399.4 eV, assigned to nitrogen from nitro group with torsion angle of 154°, nitro group with torsion angle of 167°, planar nitro group, -N(O) = C- group, amino-group and -N = C- group, respectively. (b) N 1s XPS spectrum of free LLM-105 crystal with scan number of 8. It is fit with four components at 405.2, 400.2 403.1 and 405.7 ev, assigned to the nitrogen of nitro group, -N(O) = C- group, amino-group and -N = C- group, respectively.
