Web interface for reflectivity fitting

Doucet, M.; Leal, Ricardo M. F.; Hobson, Tanner

doi:10.1016/j.softx.2018.09.001

Cited by 13 publications

(20 citation statements)

References 12 publications

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“…This two-layer model was supported by the previous QCM analysis, which demonstrated the film–water interface to have the most significant response, while higher n harmonics revealed a more gradual response. The thickness, scattering length density (SLD), and roughness of the layers were systematically varied and optimized until the sum of the χ 2 -values for all the data points were minimized (Supplementary Table S2 for fitting results) 55 . The thickness of the films were determined by h = 2 π /Δ Q , where Δ Q is the wave vector difference between fringes.…”

Section: Resultsmentioning

confidence: 99%

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SMART transfer method to directly compare the mechanical response of water-supported and free-standing ultrathin polymeric films

et al. 2021

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Intrinsic mechanical properties of sub-100 nm thin films are markedly difficult to obtain, yet an ever-growing necessity for emerging fields such as soft organic electronics. To complicate matters, the interfacial contribution plays a major role in such thin films and is often unexplored despite supporting substrates being a main component in current metrologies. Here we present the shear motion assisted robust transfer technique for fabricating free-standing sub-100 nm films and measuring their inherent structural–mechanical properties. We compare these results to water-supported measurements, exploring two phenomena: 1) The influence of confinement on mechanics and 2) the role of water on the mechanical properties of hydrophobic films. Upon confinement, polystyrene films exhibit increased strain at failure, and reduced yield stress, while modulus is reduced only for the thinnest 19 nm film. Water measurements demonstrate subtle differences in mechanics which we elucidate using quartz crystal microbalance and neutron reflectometry.

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Section: Resultsmentioning

confidence: 99%

“…Each sample was exposed to the room-temperature water surface for 1 h during the alignment procedure and subsequently scanned with a Q -vector range from 0.008 to 0.060 Å −1 . Data reduction and fitting were performed through the online reflectivity modeling software provided by BL-4B 55 .…”

Section: Methodsmentioning

confidence: 99%

SMART transfer method to directly compare the mechanical response of water-supported and free-standing ultrathin polymeric films

et al. 2021

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“…The footprint on the sample is kept constant through adjustments in the sample slit opening commensurate with the angle of incidence. Analysis was done using the Motofit analysis package and ORNL’s web interface (Webi). , Measurements result in a reflectivity ( R ) as a function of Q , which can be modeled to produce an SLD profile as a function of sample depth.…”

Section: Methodsmentioning

confidence: 99%

“…Analysis was done using the Motofit analysis package and ORNL's web interface (Webi). 33,34 Measurements result in a reflectivity (R) as a function of Q, which can be modeled to produce an SLD profile as a function of sample depth.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

The Study of the Binder Poly(acrylic acid) and Its Role in Concomitant Solid–Electrolyte Interphase Formation on Si Anodes

Browning

Sacci

Doucet

et al. 2020

ACS Appl. Mater. Interfaces

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We use neutron reflectometry to study how the polymeric binder, poly(acrylic acid) (PAA), affects the in situ formation and chemical composition of the solid−electrolyte interphase (SEI) formation on a silicon anode at various states of charge. The reflectivity is correlated with electrochemical quartz crystal microbalance to better understand the viscoelastic effects of the polymer during cycling. The use of model thin films allows for a well-controlled interface between the amorphous Si surface and the PAA layer. If the PAA perfectly coats the Si surface and standard processing conditions are used, the binder will prevent the lithiation of the anode. The PAA suppresses the growth of a new layer formed at early states of discharge (open circuit voltage to 0.8 V vs Li/Li + ), protecting the surface of the anode. At 0.15 V, the SEI layer underneath the PAA changes in chemical composition as indicated by an increase in the scattering length density and thickness as the layer incorporates components from the electrolyte, most likely the salt. At lithiated and delithiated states, the SEI layer changes in chemical composition and grows in thickness with delithiation and shrinks during lithiation.

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“…The black curves in Fig.6(c) show the best fit of reconstructed XRR curves. XRR curves were fitted using the REFL1D program(Doucet et al, 2018). A simple slab model with one layer was used.…”

mentioning

confidence: 99%

X-ray reflectivity from curved surfaces as illustrated by a graphene layer on molten copper

Konovalov¹,

Belova²,

Porta³

et al. 2022

J Synchrotron Radiat

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The X-ray reflectivity technique can provide out-of-plane electron-density profiles of surfaces, interfaces, and thin films, with atomic resolution accuracy. While current methodologies require high surface flatness, this becomes challenging for naturally curved surfaces, particularly for liquid metals, due to the very high surface tension. Here, the development of X-ray reflectivity measurements with beam sizes of a few tens of micrometres on highly curved liquid surfaces using a synchrotron diffractometer equipped with a double crystal beam deflector is presented. The proposed and developed method, which uses a standard reflectivity θ–2θ scan, is successfully applied to study in situ the bare surface of molten copper and molten copper covered by a graphene layer grown in situ by chemical vapor deposition. It was found that the roughness of the bare liquid surface of copper at 1400 K is 1.25 ± 0.10 Å, while the graphene layer is separated from the liquid surface by a distance of 1.55 ± 0.08 Å and has a roughness of 1.26 ± 0.09 Å.

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Web interface for reflectivity fitting

Cited by 13 publications

References 12 publications

SMART transfer method to directly compare the mechanical response of water-supported and free-standing ultrathin polymeric films

SMART transfer method to directly compare the mechanical response of water-supported and free-standing ultrathin polymeric films

The Study of the Binder Poly(acrylic acid) and Its Role in Concomitant Solid–Electrolyte Interphase Formation on Si Anodes

X-ray reflectivity from curved surfaces as illustrated by a graphene layer on molten copper

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