Upscaling the urea method synthesis of CoAl layered double hydroxides

• Camilo Jaramillo-Hernández,
• Víctor Oestreicher,
• Martín Mizrahi and
• Gonzalo Abellán

Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76

• spectroscopic techniques (ATR-FTIR, UV–vis, XPS, ICP-MS, and XANES-EXAFS). In the case of the volumetric scale-up, a reduction of 45% in the lateral dimensions of the crystals (from 3.7 to 2.0 µm) is observed as the reaction volume increases. This fact is related to modified heating processes affecting the

• of the structural features of the scale-up samples determined by extended X-ray absorption fine structure (EXAFS) measurements, the used model, and the corresponding fits can be found in Supporting Information File 1 (Figure S9 and Table S3). Thermal decomposition in both inert (nitrogen) and

• , requiring their specific optimization. Overall, this work demonstrates, by means of several structural, microscopic, and spectroscopic techniques (including XANES-EXAFS synchrotron experiments), that the reproducible large-scale synthesis of high-quality morphologically controlled CoAl-LDHs is feasible

Sputtering onto liquids: a critical review

• Anastasiya Sergievskaya,
• Adrien Chauvin and
• Stephanos Konstantinidis

Beilstein J. Nanotechnol. 2022, 13, 10–53, doi:10.3762/bjnano.13.2

Green and scalable synthesis of nanocrystalline kuramite

• Andrea Giaccherini,
• Giuseppe Cucinotta,
• Stefano Martinuzzi,
• Enrico Berretti,
• Werner Oberhauser,
• Alessandro Lavacchi,
• Giovanni Orazio Lepore,
• Giordano Montegrossi,
• Maurizio Romanelli,
• Antonio De Luca,
• Massimo Innocenti,
• Vanni Moggi Cecchi,
• Matteo Mannini,
• Antonella Buccianti and
• Francesco Di Benedetto

Beilstein J. Nanotechnol. 2019, 10, 2073–2083, doi:10.3762/bjnano.10.202

• (EXAFS) signal. EXAFS spectra were fitted through the use of ARTEMIS, FEFF8 and ATOMS software in the Fourier transform (FT) space [58][60][61]. Results Scanning electron microscopy Typical SEM images are presented in Figure 1 where no appreciable differences among the tens of observations performed on

• and confirmed by the Raman spectra of sphalerite showing only one sharp and very intense peak (RUFF ID: R040136; [80][81]). X-ray absorption spectroscopy EXAFS (at Cu and Sn K-edge) of samples S1, S2 and S3, along with the respective Fourier transforms, are shown in Figure 5 together with the

• corresponding multiparameter fits. The fit results for the I coordination shell with S are reported in Table 4. EXAFS analysis at the Cu K-edge leads to Cu–S bond distances extremely close to those of Cu in a CTS structure, in the typical range of a four-fold coordination with S (e.g., the work of Bacewicz et

Au₅₅, a stable glassy cluster: results of ab initio calculations

• Dieter Vollath,
• David Holec and
• Franz Dieter Fischer

Beilstein J. Nanotechnol. 2017, 8, 2221–2229, doi:10.3762/bjnano.8.222

• the term “low-symmetry structure” instead of non-crystalline in their review article [11]. Further experimental results going far beyond this short introduction, are summarized in a review by Schmid [6]. In addition to these reports based primarily on X-ray diffraction and EXAFS measurements, studies

Atomic structure of Mg-based metallic glass investigated with neutron diffraction, reverse Monte Carlo modeling and electron microscopy

• Rafał Babilas,
• Dariusz Łukowiec and
• Laszlo Temleitner

Beilstein J. Nanotechnol. 2017, 8, 1174–1182, doi:10.3762/bjnano.8.119

• samples was characterized by high-energy X-ray and neutron diffraction as well as the EXAFS method. The obtained experimental data were fitted by RMC modeling. Also, Gao et al. [11] used ab initio molecular dynamics to describe the atomic structure of a Mg65Cu25Y10 alloy during transformation from the

Structural properties and thermal stability of cobalt- and chromium-doped α-MnO₂ nanorods

• Romana Cerc Korošec,
• Polona Umek,
• Alexandre Gloter,
• Jana Padežnik Gomilšek and
• Peter Bukovec

Beilstein J. Nanotechnol. 2017, 8, 1032–1042, doi:10.3762/bjnano.8.104

• that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co2+ to Co3+ during the reaction was proved by an XANES study, while EXAFS results confirm that both dopant ions substitute Mn4+ in the center of an octahedron. The K/Mn ratio in the doped samples

• that of the undoped ones. Dopant ions do not preserve the MnO2 phase at higher temperatures nor do they destabilize the cryptomelane structure. Keywords: α-MnO2; doping; EXAFS; nanorods; XANES; Introduction The wide range of physical and chemical properties of manganese dioxide (MnO2), which exists

• -170, the Cr K edge pre-peak at ΔE ~ 4 eV is of slightly different shape than in the other two spectra, indicating possible distortion of the symmetry of the Cr site. All EXAFS spectra are very similar, showing three distinct peaks in the r region up to 4 Å (Figure 6a), suggesting that Co and Cr dopant

Cubic chemically ordered FeRh and FeCo nanomagnets prepared by mass-selected low-energy cluster-beam deposition: a comparative study

• Veronique Dupuis,
• Anthony Robert,
• Arnaud Hillion,
• Ghassan Khadra,
• Nils Blanc,
• Damien Le Roy,
• Florent Tournus,
• Clement Albin,
• Olivier Boisron and
• Alexandre Tamion

Beilstein J. Nanotechnol. 2016, 7, 1850–1860, doi:10.3762/bjnano.7.177

• . Therefore, we have performed a series of extended X-ray absorption fine structure (EXAFS) measurements on FeCo samples, at both Fe and Co K edges, to describe local order at each atomic site for different cluster sizes. We have had to develop a specific strategy, more complex than for our previous analysis

• , increases up to 1.5μB in 2 nm FeRh sample (see Figure 11). While it has long been known that the bcc FeRh unit cell volume expands upon transforming to the FM order [30], we use EXAFS experiments to determine the local iron environment before and after annealing. From a quantitative FEFFIT analysis at the

Paramagnetism of cobalt-doped ZnO nanoparticles obtained by microwave solvothermal synthesis

• Jacek Wojnarowicz,
• Sylwia Kusnieruk,
• Tadeusz Chudoba,
• Stanislaw Gierlotka,
• Witold Lojkowski,
• Wojciech Knoff,
• Malgorzata I. Lukasiewicz,
• Bartlomiej S. Witkowski,
• Anna Wolska,
• Marcin T. Klepka,
• Tomasz Story and
• Marek Godlewski

Beilstein J. Nanotechnol. 2015, 6, 1957–1969, doi:10.3762/bjnano.6.200

• -ray absorption fine structure (EXAFS) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and with magnetometry using superconducting quantum interference device (SQUID). Irrespective of the Co content, nanoparticles in their initial state present a similar

• was calculated to be 350 nm (Table 4). XAS investigations of Zn1−xCoxO before annealing The data shown in Figure 10 presents the Fourier transformations of EXAFS oscillations taken at the Zn K-edge for the as-synthesized nanopowders. These data indicate that the introduction of Co into ZnO does not

• cause any structural changes in the investigated samples. A comparison of the Fourier transformations of EXAFS oscillations (measured at the Co K-edge for four types of Zn1−xCoxO NPs and for the reference Zn1−xCoxO sample grown by atomic layer deposition (ALD)) is shown in Figure 11. The method of

Extended X-ray absorption fine structure of bimetallic nanoparticles

• Carolin Antoniak

Beilstein J. Nanotechnol. 2011, 2, 237–251, doi:10.3762/bjnano.2.28

• density functional theory calculations on the magnetic properties. Keywords: bimetallic alloys; EXAFS; FePt; nanoparticles; wavelets; XAS; Introduction Since the discovery of X-rays in 1895 by Röntgen, the field of spectroscopy methods using this regime of the electromagnetic spectrum has reached a very

• structure (XANES). In the energy range above the XANES region – typically from 100 eV to 1000 eV above the absorption edge – the extended X-ray absorption fine structure (EXAFS) contains information about the type and distance of atoms in the local environment of the absorbing atom. In the literature

• several examples can be found for EXAFS analysis on nanoparticle systems, e.g., Co [8], CdS [9], CdSe [10], SnO2 [11] and Au [12] nanoparticles, as well as Ag nanoparticles embedded in glass [13][14]. To discuss the advantages and possible drawbacks of EXAFS analysis in nanoparticulate systems, this paper

Zirconium nanoparticles prepared by the reduction of zirconium oxide using the RAPET method

• Michal Eshed,
• Swati Pol,
• Aharon Gedanken and
• Mahalingam Balasubramanian

Beilstein J. Nanotechnol. 2011, 2, 198–203, doi:10.3762/bjnano.2.23

• employed to confirm the formation of metallic Zr synthesized (Zr-syn) by RAPET of ZrO2. The techniques of XAS, namely X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), are used to probe local structural details [13] around specific metal atoms and to discern

• indicates that in the Zr-syn sample at least 75% of the Zr atoms are in the fully reduced Zr0 state. Figure 2b represents the normalized k3-weighted EXAFS spectra of Zr-syn, compared separately with hcp Zr (top) and ZrO2 (bottom). The corresponding Fourier transforms (FT), which represents a pseudo radial

• marked. Note that the Zr–Zr correlation distance in metallic hcp Zr is much smaller than that found in ZrO2. The EXAFS (Figure 2b) of Zr-syn is distinctly different for low k-values (below ~5 Å−1) when compared to hcp Zr, but for high k-values (above ~5 Å−1) the spectra of Zr-syn shows a better

Ultrafine metallic Fe nanoparticles: synthesis, structure and magnetism

• Olivier Margeat,
• Marc Respaud,
• Catherine Amiens,
• Pierre Lecante and
• Bruno Chaudret

Beilstein J. Nanotechnol. 2010, 1, 108–118, doi:10.3762/bjnano.1.13

• ., lower than that of bulk iron. XANES and EXAFS are other powerful tools for the study of short range order [29]. We therefore carried out these measurements at the iron K-edge at room temperature. Figure 3 shows the data obtained for the iron NPs and an iron foil used as a reference, and the first

• higher energies for NPs as compared to the reference. Unfortunately, the EXAFS signal is strongly damped, which prevents further analysis of the higher energy part. Notwithstanding, the results (both shape and damping) are consistent with published data on amorphous iron [31], thus exhibiting metallic