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Materials Today Energy: 37 pp. 101395
Solar-assisted approach for the synthesis of nanoadsorbents for biogas desulfurization using wastes
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Minimizing food wastes and finding a second life use for industrial residuals have become some of the top priorities of modern society. This work considers the use of spent eggs and mussels shells, as well as marble dust, as raw sources to develop nanoparticles involving renewable resources in both their preparation and adoption in technological applications. Specifically, Ca/Mg-based nanoparticles were obtained by evaporating such wastes in a physical vapor deposition system using concentrated solar beam and explored as high capacity H2S adsorbents for the purification of biogas. The evaluation of their uptake performance in a fixed-bed configuration indicates that the formation of a thick layer of Ca(OH)2 on very small nanoparticles (<70 nm) inhibits H2S uptake, whereas the presence of Mg phases (dolomite) favors its potentiation. Importantly, the co-evaporation of iron provides an extra amplification of the absorption capacity due to the synergy of the Ca/Mg neutralizing character and the affinity of Fe for sulfur. In the best case, the nanoparticles obtained from mussels and 10 %wt. Fe reached an uptake capacity of 0.92 mg/g. This high yield is attributed to the formation of oxides, such as Ca2Fe2O5, that allow a sulfide to sulfate oxidation-adsorption mechanism.
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from our users
Chem. Mater. 2023
Lithium-Induced Reorientation of Few-Layer MoS2 Films
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Molybdenum disulfide (MoS2) few-layer films have gained considerable attention for their possible applications in electronics and optics and also as a promising material for energy conversion and storage. Intercalating alkali metals, such as lithium, offers the opportunity to engineer the electronic properties of MoS2. However, the influence of lithium on the growth of MoS2 layers has not been fully explored. Here, we have studied how lithium affects the structural and optical properties of the MoS2 few-layer films prepared using a new method based on one-zone sulfurization with Li2S as a source of lithium. This method enables incorporation of Li into octahedral and tetrahedral sites of the already prepared MoS2 films or during MoS2 formation. Our results discover an important effect of lithium promoting the epitaxial growth and horizontal alignment of the films. Moreover, we have observed a vertical-to-horizontal reorientation in vertically aligned MoS2 films upon lithiation. The measurements show long-term stability and preserved chemical composition of the horizontally aligned Li-doped MoS2.
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our research
ACS Nano 2023, 17, 16, 16080–16088
Culling a Self-Assembled Quantum Dot as a Single-Photon Source Using X-ray Microscopy
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Epitaxially grown self-assembled semiconductor quantum dots (QDs) with atom-like optical properties have emerged as the best choice for single-photon sources required for the development of quantum technology and quantum networks. Nondestructive selection of a single QD having desired structural, compositional, and optical characteristics is essential to obtain noise-free, fully indistinguishable single or entangled photons from single-photon emitters. Here, we show that the structural orientations and local compositional inhomogeneities within a single QD and the surrounding wet layer can be probed in a screening fashion by scanning X-ray diffraction microscopy and X-ray fluorescence with a few tens of nanometers-sized synchrotron radiation beam. The presented measurement protocol can be used to cull the best single QD from the enormous number of self-assembled dots grown simultaneously. The obtained results show that the elemental composition and resultant strain profiles of a QD are sensitive to in-plane crystallographic directions. We also observe that lattice expansion after a certain composition-limit introduces shear strain within a QD, enabling the possibility of controlled chiral-QD formation. Nanoscale chirality and compositional anisotropy, contradictory to common assumptions, need to be incorporated into existing theoretical models to predict the optical properties of single-photon sources and to further tune the epitaxial growth process of self-assembled quantum structures.
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Deliverables view all
WP12 - JA2 – X-ray Wavefront Metrology, Correction and Manipulation
D12.4 - First user experiment with corrected hard X-ray nanobeam
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Compound refractive lenses (CRLs) are widely used at synchrotron radiation facilities for X-ray beam shaping and focusing. They are mainly made by pressing a parabolic lens profile into a thin foil of aluminum or beryllium via a coining process. Their focusing capability depends on the manufacturing quality of the stamp and mechanical alignment during the coining process, both of which are limited by today’s technology. Recently, diamond CRLs made by laser ablation and mechanical polishing emerged, which exhibit similar shape errors. It has been shown that each lens shows a typical shape deviation of 500 nm from an ideal paraboloid of rotation. When many of these lenses are stacked in order to create submicrometer X-ray beams, these shape errors add up and lead to spherical aberration, impacting the resolution and imaging capabilities of X-ray microscopes. A solution to overcome these challenges is the correction of aberration by an additional optical element, called a refractive phase plate. It is tailor-made for the specific lens configuration and needs to be aligned with respect to the optical axis to within a few micrometers, requiring a motorization within a plane perpendicular to the optical axis. Here, we present the further development of the lens unit with integrated phase plate kinematic and the application at a high x-ray energy of 32 keV in a user experiment at beamline P06 at DESY. The performance of the focusing unit was evaluated at-wavelength in the high-coherence mode with ptychography and in the high-flux mode with a fluorescence knife-edge. Both methods are available to users at the beamline.
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WP15 - JA5 - Correlative Nano-Spectroscopy and Nano-Diffraction
D15.3 - Fabrication of nanoparticle pattern templates
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The working package WP15 of NFFA-Europe PILOT on Correlative Nano-Spectroscopy and Nano-Diffraction - Joint Action 5 (JA5) - aims to establish a user platform for routine experiments at Nanolabs and analytical large-scale facilities (ALSFs) permitting to collect structural and chemical information from a statistically relevant number of distinct nanoscale objects. Importantly, one prerequisite for an optimal determination of one-to-one size-structure-property correlations is that the probes like e.g., electrons or X-rays are illuminating individual nanoparticles. For experiments with a focused X-ray beam the foot-print is typically in the range of a few 10 nm × 10 nm up to a few 10 μm × 10 μm depending on the setup and the angle of incidence on the sample surface. Isolation of the nano-objects is required to ensure that signals are collected from only single nanoparticles. According to this prerequisite, the design and the creation of the proper templates for this type of experiments and the careful selection of protocols for the individual nanocrystal arrangement on the templates are essential (Task 15.2). The purpose of the deliverable D15.3 which is a part of the Task 15.2 is to summarize the different protocols for the fabrication of the templates and those of the individual arrangement of the nanocrystals on them by their colloidal dispersions. Optimization of the templates and arrangement protocols is included in this report ensuring a successful correlative experiment.
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WP2 - MGT2 - Pilot scheme for the management of a distributed research infrastructure offering harmonised, interoperable and integrated services
D2.4 - First call for additional providers
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According to the Grant Agreement, in the lifetime of NFFA-Europe Pilot the Transnational Access offer must enlarge to meet (i) the qualitative needs of users that could be better met with new specialized providers, or (ii) quantitative needs resulting in oversubscription of the current capacity. To this aim, two calls for additional access providers were foreseen at M24 and M40, respectively. This report describes the rationale that led to the text of the first call for additional access providers, i.e. from the evaluation of the needs – mainly based on the analysis provided in the deliverable D2.3 “First balance of access provision” - to the search for alternative solutions to widen and strengthen the current offer.
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Transnational Access Statistics
24 calls for access
824 proposals submitted
63% rate of acceptance
29% with Large Scale Facilities
12% with theory
12% with industry
~3 average users per proposal
63 countries applying
2378 lab sessions