A study of HMDSO/O2 plasma deposits using a high-sensitivity and -energy resolution XPS instrument: curve fitting of the Si 2p core level

Alexander, Morgan R.; Short, Robert D.; Jones, Frank R.; Michaeli, Walter; Blomfield, C. J.

doi:10.1016/s0169-4332(98)00479-6

Cited by 309 publications

(152 citation statements)

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“…The five Si oxidation states were fit with symmetric Gaussian/Lorentzian product peaks with a mixing parameter of 10 (mixing of 0/100 gives a pure Gaussian/pure Lorentzian line shape). Positions for the Si(0), Si( þ 1), Si( þ 2), Si( þ 3) and Si( þ 4) components were chosen based on literature values and allowed to vary by 0.1 eV during fitting, while the peak width was allowed to vary approximately within the bounds established by the literature 42,43,[67][68][69] . Photocatalytic hydrogen evolution.…”

Section: Methodsmentioning

confidence: 99%

Bottom-up synthesis of high surface area mesoporous crystalline silicon and evaluation of its hydrogen evolution performance

et al. 2014

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As an important material for many practical and research applications, porous silicon has attracted interest for decades. Conventional preparations suffer from high mass loss because of their etching nature. A few alternative routes have been reported, including magnesiothermic reduction; however, pre-formed porous precursors are still necessary, leading to complicated syntheses. Here we demonstrate a bottom-up synthesis of mesoporous crystalline silicon materials with high surface area and tunable primary particle/pore size via a self-templating pore formation process. The chemical synthesis utilizes salt by-products as internal self-forming templates that can be easily removed without any etchants. The advantages of these materials, such as their nanosized crystalline primary particles and high surface areas, enable increased photocatalytic hydrogen evolution rate and extended working life. These also make the mesoporous silicon a potential candidate for other applications, such as optoelectronics, drug delivery systems and even lithium-ion batteries.

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Section: Methodsmentioning

confidence: 99%

Bottom-up synthesis of high surface area mesoporous crystalline silicon and evaluation of its hydrogen evolution performance

et al. 2014

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“…XPS spectra were calibrated using the main C1s peak component, which is well characterised in the literature. Works in the literature specify spectra of DLC films should be calibrated to the hydrocarbon (CHx) peak at 284.4 eV (19)(20)(21)(22). Calibration shifted the spectrum by 1.2 eV, correcting for charging issues.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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Diamond-like Carbon coatings are well-known for their excellent wear and friction reducing properties. Novel DLCs are constantly being developed that further these beneficial characteristics; this is often achieved by incorporating a dopant into the microstructure of the DLC. One dopant that is widely used currently in commercial settings, including F1 car engines, is silicon. Si doping can be, to some extent, regarded as a double-edged sword. This is because, whilst it has been reported as being able to reduce friction in certain environments, this usually comes at the cost of far higher wear than the corresponding un-doped DLC. The fundamental aspects of Si-DLC's friction and wear properties are explored herein with the goal of optimising the coating using fundamental tribochemical knowledge.

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“…In the case of g-FOTES, the C 1 s signal was a convolution of five components at 285.2 eV, originating from C-C and C-Si [44][45][46], and at 286.5, 291.5, 294.0, and 288.0 eV attributable to C-O [39], -CF 2 and -CF 3 groups [39,44,45], as well as a contamination component, respectively (Figure 4c). Two components for the Si 2p signal at 102.9 and 103.7 eV were ascribed to Si-C [47,48] and glass [49], as shown in Figure 4f.…”

Section: Resultsmentioning

confidence: 99%

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

Penna

Careri

Spencer

et al. 2015

J. Am. Soc. Mass Spectrom.

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Abstract. Since it was proposed for the first time, desorption electrospray ionizationmass spectrometry (DESI-MS) has been evaluated for applicability in numerous areas. Elucidations of the ionization mechanisms and the subsequent formation of isolated gas-phase ions have been proposed so far. In this context, the role of both surface and pneumatic effects on ion-formation yield has recently been investigated. Nevertheless, the effect of the surface chemistry has not yet been completely understood. Functionalized glass surfaces have been prepared, in order to tailor surface performance for ion formation. Three substrates were functionalized by depositing three different silanes [3-mercaptopropyltriethoxysilane (MTES), octyltriethoxysilane (OTES), and 1H,1H,2H,2H-perfluorooctyltriethoxy-silane (FOTES)] from toluene solution onto standard glass slides. Surface characterization was carried out by contact-angle measurements, tapping-mode atomic force microscopy, and X-ray photoelectron spectroscopy. Morphologically homogeneous and thickness-controlled films in the nm range were obtained, with surface free energies lying between 15 and 70 mJ/m 2 . These results are discussed, together with those of DESI-MS on lowmolecular-weight compounds such as melamine, tetracycline, and lincomycin, also taking into account the effects of the sprayer potential and its correlation with surface wettability. The results demonstrate that ionformation efficiency is affected by surface wettability, and this was demonstrated operating above and below the onset of the electrospray.

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A study of HMDSO/O2 plasma deposits using a high-sensitivity and -energy resolution XPS instrument: curve fitting of the Si 2p core level

Cited by 309 publications

References 4 publications

Bottom-up synthesis of high surface area mesoporous crystalline silicon and evaluation of its hydrogen evolution performance

Bottom-up synthesis of high surface area mesoporous crystalline silicon and evaluation of its hydrogen evolution performance

Repressing oxidative wear within Si doped DLCs

Effects of Tailored Surface Chemistry on Desorption Electrospray Ionization Mass Spectrometry: a Surface-Analytical Study by XPS and AFM

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