Pressure and temperature dependence of EXAFS Debye-Waller factor of platinum

Duc, Nguyen Ba; Tho, Vu Quang; Tien, Tong Sy; Khoa, Doan Quoc; Hieu, Ho Khac

doi:10.1016/j.radphyschem.2018.03.017

Cited by 15 publications

(16 citation statements)

References 33 publications

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“…We implement in situ extended X-ray absorption fine structure (EXAFS) spectroscopy as a method of nanothermometry. Recent reports have shown that fitting the Debye–Waller factor extracted by EXAFS allows for the experimental determination of the temperature of the material under investigation. ,,− , In section S2, we show that the sensibility of an EXAFS-based nanothermometer is comparable to that of luminescent nanothermometers , and nearly 3 orders of magnitude higher than that of X-ray diffraction (XRD)-based nanothermometry methods. ,, The extraction of Debye–Waller factor is performed by fitting the spectroscopic data to the EXAFS equation (eq ). …”

Section: Introductionmentioning

confidence: 99%

“…Here, we design heterodimers, consisting of epitaxially attached Pt and Fe 3 O 4 NCs, as a model system to demonstrate the efficacy of induction heating of catalytically relevant and paramagnetic species, such as Pt. − Fe 3 O 4 NCs operate as a nanoscale inductive heat source, while Pt NCs remain nearly unaffected by the induction field and therefore act as a probe material for nanothermometry, while Fe 3 O 4 has the potential to undergo phase transformations at higher temperatures and is therefore not directly measured. We design this combination of NC species to investigate the temperature difference of the NCs as compared to their local support environment.…”

Section: Introductionmentioning

confidence: 99%

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In Situ EXAFS-Based Nanothermometry of Heterodimer Nanocrystals under Induction Heating

et al. 2022

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The ability to heat nanocrystalline materials through magnetic induction has been used in the fields of catalysis, biomedical sciences, and polymer degradation. However, the working temperature to which the inductively coupled material rises is still poorly understood. Herein, we use extended X-ray absorption fine structure spectroscopy in conjunction with thermal imaging to improve the understanding of heating in inductively coupled systems. After extraction of the Debye−Waller factor from the spectroscopy, we obtain the temperature of inductively heated nanocrystals from the correlated Debye model. We combine carbon-supported iron oxide nanocrystals as induction heating agents with platinum nanocrystals as thermal probes. By testing these nanocrystal species as both unattached nanocrystals and heterodimers, we report that nanostructured systems show a significant temperature difference of up to 73.60 °C when compared to their local support environment. This result has implications for inductively heated catalysis, magnetic hyperthermia for targeted cell death, and polymer synthesis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ EXAFS-Based Nanothermometry of Heterodimer Nanocrystals under Induction Heating

et al. 2022

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“…Concerning relatively simple systems, a slightly lower compressibility was found by San-Miguel et al for ZnTe from EXAFS with respect to diffraction [18]. The pressure effects on the EXAFS Debye-Waller factors of Cu, Kr, Si, Ge and Pt have been calculated by anharmonic Einstein or correlated Debye models [26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Bond compressibility and bond Grüneisen parameters of CdTe

Fornasini¹,

Grisenti²,

Irifune³

et al. 2018

J. Phys.: Condens. Matter

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Extended x-ray absorption fine structure (EXAFS) at the Cd K edge and diffraction patterns have been measured on CdTe as a function of pressure from 100 kPa (1 bar) to 5 GPa using a cell with nano-polycrystalline diamond anvils and an x-ray focussing scanning spectrometer. Three phases-zincblende (ZB), mixed cinnabar-ZB and rocksalt (RS)-are well distinguished in different pressure intervals. The bond compressibility measured by EXAFS in the ZB phase is slightly smaller than the one measured by diffraction and decreases significantly faster when the pressure increases; the difference is attributed to the effect of relative vibrations perpendicular to the Cd-Te bond. The parallel mean square relative displacement (MSRD) decreases, the perpendicular MSRD increases when the pressure increases, leading to an increasing anisotropy of relative atomic vibrations. A constant-temperature bond Grüneisen parameter (GP) has been evaluated for the ZB phase and compared with the constant-pressure bond GP measured in a previous experiment; an attempt is made to connect the bond GPs measured by EXAFS and the more familiar thermodynamic GP and mode GPs; the comparisons suggest the inadequacy of the quasi-harmonic approximation to deal with the local vibrational properties sampled by EXAFS.

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“…4. Meanwhile, other ACD models in the previous works (Hung et al, 2010(Hung et al, , 2016Duc et al, 2017Duc et al, , 2018b have not yet performed calculations for these expressions.…”

Section: Anharmonic Exafs Cumulants Within the Extended Acd Modelmentioning

confidence: 99%

“…crystals (Hung et al, 2016) and face-centered cubic (f.c.c.) crystals (Duc et al, 2017(Duc et al, , 2018b. Still, the ACD model has not yet been used for analyzing the anharmonic EXAFS oscillation and optimized for the expressions of cumulants, especially in the low-temperature limit.…”

Section: Introductionmentioning

confidence: 99%

Effect of the non-ideal axial ratio c/a on anharmonic EXAFS oscillation of h.c.p. crystals

Tien¹

2021

J Synchrotron Radiat

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The temperature and wavenumber dependence of the extended X-ray absorption fine-structure (EXAFS) oscillation of hexagonal close-packed (h.c.p.) crystals have been calculated and analyzed under the effect of the non-ideal axial ratio c/a. The anharmonic EXAFS oscillation is presented in terms of the Debye–Waller factor using the cumulant expansion approach up to the fourth order. An effective calculation model is expanded and developed from the many-body perturbation approach and correlated Debye model using the anharmonic effective potential. This potential, depending on the non-ideal axial ratio c/a, is obtained from the first-shell near-neighbor contribution approach. A suitable analysis procedure is performed by evaluating the influence of EXAFS cumulants on the phase shift and amplitude reduction of the anharmonic EXAFS oscillation. The numerical results for crystalline zinc are found to be in good agreement with those obtained from experiments and other theoretical methods at various temperatures. The obtained results show that the present theoretical model is essential and effective in improving the accuracy for analyzing the experimental data of anharmonic EXAFS signals of h.c.p. crystals with a non-ideal axial ratio c/a.

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Pressure and temperature dependence of EXAFS Debye-Waller factor of platinum

Cited by 15 publications

References 33 publications

In Situ EXAFS-Based Nanothermometry of Heterodimer Nanocrystals under Induction Heating

In Situ EXAFS-Based Nanothermometry of Heterodimer Nanocrystals under Induction Heating

Bond compressibility and bond Grüneisen parameters of CdTe

Effect of the non-ideal axial ratio c/a on anharmonic EXAFS oscillation of h.c.p. crystals

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