Local structural studies on Co doped ZnS nanowires by synchrotron X-ray atomic pair distribution function and micro-Raman shift

Abstract

The atomic structures of nanowires were studied by X-ray atomic pair distribution function analysis and total synchrotron X-ray scattering data. A PDF method was used to describe a wurtzite and zinc-blended mixed phase model.

Co,N-Codoped Porous Carbon-Supported CoyZnS with Superior Activity for Nitroarene Hydrogenation

“…By contrast, the XPS spectra of CoN x -Co y ZnS@NPC-Z display a slight blue shift (Figure b). This difference further confirms the successful embedding of Co into ZnS, which can interact with Zn to affect the Co electronic structure. , Compared with Co@NPC XPS, peaks for CoN x -Co y ZnS@NPC-Z at 779.7 eV (Co 3+ ) and 783.6 eV (Co 2+ ) show a slight shift (Figure c), verifying the interaction between Zn and Co in the phase of Co 0.025 Zn 0.975 S. − The peak at 780.3 eV is a characteristic profile for Co–N x . The high-resolution XPS spectrum of S 2p is deconvoluted into two peaks at the binding energy of 162.7 and 167.9 eV (Figure d), corresponding to coordinated S, and oxidized sulfur species, respectively. , The C 1s spectra display the peaks, standing for CC, C–O/CN, and C–O–C/C–N species (Figure S1c in the Supporting Information). − The N 1s spectra are deconvoluted into four subpeaks, representing pyridinic-N (397.5 eV), pyrrolic-N (398.4 eV), graphitic-N (400.1 eV), and oxidized N (402.6 eV) (Figure S1d in the Supporting Information). ,, As reported previously, the pyridinic-N can coordinate with Co to form stable Co–N x . , The N-doped carbon can improve the conductivity of carbon, in favor of the catalytic activity of CoN x -Co y ZnS@NPC- Z (Figure S1d).…”

“…This difference further confirms the successful embedding of Co into ZnS, which can interact with Zn to affect the Co electronic structure. 38,39 Compared with Co@NPC XPS, peaks for CoN x -Co y ZnS@NPC-Z at 779.7 eV (Co 3+ ) and 783.6 eV (Co 2+ ) show a slight shift (Figure 1c), verifying the interaction between Zn and Co in the phase of Co 0.025 Zn 0.975 S. 40−43 The peak at 780.3 eV is a characteristic profile for Co−N x . 33 The high-resolution XPS spectrum of S 2p is deconvoluted into two peaks at the binding energy of 162.7 and 167.9 eV (Figure 1d), corresponding to coordinated S, and oxidized sulfur species, respectively.…”

Sulfur Vacancy-Rich Carbonaceous Co9S8-ZnS Nanotubes for the Oxygen Evolution Reaction

“…53−55 The Co 2p region of Co 9 S 8 -ZnS/NTC consists of Co 2p 3/2 , Co 2p 1/2 , and satellite peaks (identified as "Sat") (Figure 5b), each of which can be deconvoluted into Co 3+ (778.4 and 781.3 eV), Co 2+ (793.5 and 797.4 eV), and Sat (785.1 and 801.0 eV) peaks. 48 In the high-resolution S 2p spectrum (Figure 5c), the peaks at 161.3 and 162.1 eV belong to the Zn−S bond, and those at 161.6 and 162.6 eV are attributed to the Co−S moiety. 53 Other S 2p peaks at 163.3 and 165.0 eV correspond to the C−S−C bond, and that at 168.8 eV is associated to the C−SO x −C group.…”

Synthesis, local structure and optical property studies of α-SnS microrods by synchrotron X-ray pair distribution function and micro-Raman shift

“…The detailed experimental procedure for obtaining ScXRD data was reported previously. [13][14][15] Samples of SnS-A and SnS-B were sealed in Kapton foil for the ScXRD measurements. The sample was mounted orthogonally in the path of the beam with a distance between the samples and detector of 211 mm.…”

“…The ScXRD with a pair distribution function (PDF) is one of the most powerful tools for determining the local structure of atoms with shorter and moderate lengths. 13,14 The PDF is one of the most versatile methods which can be applied to any materials. [15][16][17] This method has numerous applications for the analysis of the structures of materials for determining crystal phase and unit-cell parameters and for quantifying various types of disorder or defects.…”