Poly(l-lactic acid), by near-ambient pressure XPS

Mechanochemical Synthesis of Thiadiazole Functionalized COF as Oil-Based Lubricant Additive for Reducing Friction and Wear

“…As shown in Figure a, the strong signal of C 1s can be divided into C–C at 284.8 eV, C–N/C–O at 286.1 eV, and C=N/C=O at 288.2 eV, indicating the deposition of Thdz@COF-F additive and its participation in the tribo-film. The O 1s spectrum (Figure b) contains the peaks of C=O, C–O, and Fe–O located at 531.9, 533.2, and 530.5 eV, respectively, , implying the existence of iron oxides and the complex tribochemical reaction on the friction interface which involves Fe matrix, Thdz@COF-F additive, and O 2 . The Fe 2p spectrum is displayed in Figure c, which includes signals of ferric oxides at 709.4, 711.0, and 712.4 eV, ferric sulfate at 714.0 eV and ferric fluoride at 715.4 eV, , further revealing the composition of the tribo-film induced by tribochemical reaction in friction contact area.…”

Electrospun Nanosystems Based on PHBV and ZnO for Ecological Food Packaging

“…The elemental composition of the nanocomposites was investigated by XPS. It is known that PLA degrades under X-ray radiation [ 75 ] and therefore the C1s spectrum was first recorded, followed by Zn 2p and O1s spectra. For example, Figure 8 a,b showed the C1s and Zn 2p core-level spectra, corresponding to the PLA/PHBV/ZnO:Fe0.3 sample.…”

A discussion of approaches for fitting asymmetric signals in X‐ray photoelectron spectroscopy (XPS), noting the importance of Voigt‐like peak shapes

“…It is important to remember that: (i) the GLS and GLP are not interchangeable with each other, (ii) mathematically speaking, the GLS is a better approximation of the Voigt function, although in practice the GLP sometimes works better (while each case will be different, this may occur for the commonly used GLP (30) function when multiple broadening events have modified the photoemission/photoelectron collection and detection because a GLP (30) closely resembles a Gaussian -see the next point), (iii) the GLP function is very similar to a Gaussian, especially when the amount of Lorentzian character in it is small, and (iv) the GLS and GLP continue to work well in much XPS peak fitting done today. For recent examples of the use of the GLS and GLP in XPS peak fitting, see Patel and coworkers' C 1s fit of poly(L-lactic acid) 38 and Jain and coworkers' C 1s fit of poly(γ-benzyl Lglutamate). 39 The full Voigt function, as obtained through convolution, is extensively used in routine XPS peak fitting analysis today.…”