Observation of the structural, optical and magnetic properties during the transformation from hexagonal NiS nano-compounds to cubic NiO nanostructures due to thermal oxidation

NiO/NiS Heterostructures: An Efficient and Stable Electrocatalyst for Oxygen Evolution Reaction

“…In FTIR spectra of all the samples, a peak located at 1085 cm −1 which is much more intense for NiS (Figure 2b) is associated with the stretching vibration of CO of adsorbed CO 2 . 55 The characteristic absorption peak of Ni−O is located at 633 cm −1 . 56 The presence of this peak in the NiS FTIR spectrum is due to Ni(OH) 2 , and its presence in this electrocatalyst has already been confirmed by XRD results.…”

“…However, this peak is absent in the FTIR spectrum of NiO/NiS (Figure c) which might be due to low concentration of CO 2 in this electrocatalyst. In FTIR spectra of all the samples, a peak located at 1085 cm –1 which is much more intense for NiS (Figure b) is associated with the stretching vibration of CO of adsorbed CO 2 . The characteristic absorption peak of Ni–O is located at 633 cm –1 .…”

NiS Nanospheres Anchored onto a Graphene Oxide Substrate (NiS@GO) for Efficient Electrochemical Sensing of Trace Amounts of Silver Ions

“…From the FTIR spectra (Figure 1c), we could find that the characteristic peaks emerge at 3434 cm −1 , 2926 cm −1 , 1624 cm −1 , 1377 cm −1 and 1014 cm −1 for free GO, ascribed to stretching vibration or bending vibration of O−H, C−H, O−C, and sp 2 ‐conjugated bonds. The weak peaks at 3423 cm −1 , 1629 cm −1 and 1096 cm −1 for NiS, are attributed to trace H 2 O absorbed onto NiS nanospheres [47] . Once NiS nanospheres anchor onto the surface of GO, all the characteristic peaks above emerge but shift to 3429 cm −1 , 2971 cm −1 , 1630 cm −1 , 1383 cm −1 and 1038 cm −1 respectively.…”

“…The weak peaks at 3423 cm À 1 , 1629 cm À 1 and 1096 cm À 1 for NiS, are attributed to trace H 2 O absorbed onto NiS nanospheres. [47] Once NiS nanospheres anchor onto the surface of GO, all the characteristic peaks above emerge but shift to 3429 cm À 1 , 2971 cm À 1 , 1630 cm À 1 , 1383 cm À 1 and 1038 cm À 1 respectively. The results suggest that there are strong interactions formed among NiS nanospheres and Go matrix.…”

Three-dimensional biotemplate-loaded nickel sulfide vacancies engineered to promote the absorption of electromagnetic waves

“…5a, the absorption peak at 3412.96 cm −1 is attributed to the stretching vibration of O–H. 42 The appearance of the absorption peaks at 2926.01, 2847.43, 1623.80, and 1110.82 cm −1 are attributed to asymmetric C–H stretching, symmetric C–H stretching vibration, 43 CO stretching vibration, and C–O stretching vibration, 42,44 respectively. A small peak is observed for Ni x S y @De and Ni x S y @De-etched samples around 1025.48 cm −1 .…”