| 1. |
- Ait-Mammar, Walid, et al.
(författare)
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All-Inkjet-Printed Humidity Sensors for the Detection of Relative Humidity in Air and Soil-Towards the Direct Fabrication on Plant Leaves
- 2020
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Ingår i: MRS Advances. - : CAMBRIDGE UNIV PRESS. - 2059-8521. ; 5:18-19, s. 965-973
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate the fabrication, by exclusive means of inkjet-printing, of capacitive relative humidity sensors on flexible, plastic substrate. These sensors can be successfully used for the measurement of relative-humidity in both air and common soil. We also show that the same technique may be used for the fabrication of the same type of sensors on the surface of the leaves of El AE gnus Ebbingei (silverberry).Our results demonstrate the suitability of leaves as substrate for printed electronics and pave the way to the next generation of sensors to be used in fields such as agriculture and flower farming.
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| 2. |
- Atwa, Mohamed M., et al.
(författare)
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Trilayer Graphene as a Candidate Material for Phase-Change Memory Applications
- 2016
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Ingår i: MRS Advances. - : Cambridge University Press. - 2059-8521. ; 1:20, s. 1487-1494
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Tidskriftsartikel (refereegranskat)abstract
- There is pressing need in computation of a universal phase change memory consolidating the speed of RAM with the permanency of hard disk storage. A potentiated scanning tunneling microscope tip traversing the soliton separating a metallic, ABA-stacked phase and a semiconducting ABC-stacked phase in trilayer graphene has been shown to permanently transform ABA-stacked regions to ABC-stacked regions. In this study, we used density functional theory (DFT) calculations to assess the energetics of this phase-change and explore the possibility of organic functionalization using s-triazine to facilitate a reverse phase-change from rhombohedral back to Bernal in graphene trilayers. A significant deviation in the energy per simulated atom arises when s-triazine is adsorbed, favoring the transformation of the ABC phase to the ABA phase once more. A phase change memory device utilizing rapid, energy-efficient, reversible, field-induced phase-change in graphene trilayers could potentially revolutionize digital memory industry.
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| 3. |
- Baldinozzi, Gianguido, et al.
(författare)
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Structural complexity of Y6BO12 fluorite-related ternary oxides
- 2021
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Ingår i: MRS Advances. - : SPRINGER HEIDELBERG. - 2059-8521. ; 6:4-5, s. 107-111
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Tidskriftsartikel (refereegranskat)abstract
- Oxides with generic stoichiometry M7O12 occupy, in a generic phase diagram, an intermediate place between fluorite and bixbyite structure types. Their structure is derived from the ideal fluorite structure, and it is characterized by a more or less pronounced ordering of the O vacancies within the average fluorite sublattice. We believe that ternary oxides with this kind of formula provide interesting degrees of flexibility for understanding the structural characteristic of these structures in the context of fission product stabilization in nuclear fuels and in the field of actinide waste forms as well. We would like to discuss the structural characteristics of the chemical bonds in ternary systems consisting of trivalent and hexavalent cations. Eventually, in compounds with generic formula Y6B+6O12, the B cation can be either a transition metal (W, Mo) or hexavalent uranium. We believe that studying the polyhedron of the sevenfold coordinated Y ion is particularly interesting to understand the flexibility of the chemical bonds: it is often described in the literature as a mono-capped trigonal prism, with bond lengths exhibiting an extremely large dispersion, ranging for instance from 2.19 to 2.70 angstrom in Y6WO12. We would discuss the implications of this large dispersion of distances on the chemical bond characteristics and compare DFT models with established experimental knowledge on pristine and irradiated specimens. Graphic abstract
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| 4. |
- Baránková, Hana, et al.
(författare)
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Non-Conventional Atmospheric Pressure Plasma Sources for Production of Hydrogen
- 2018
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Ingår i: MRS Advances. - : Cambridge University Press. - 2059-8521. ; 3:18, s. 921-929
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Tidskriftsartikel (refereegranskat)abstract
- The atmospheric pressure plasma sources with a coaxial geometry were used for generation of the radio frequency, microwave and pulsed dc plasmas inside water and aqueous solutions. Pulsed dc plasma generated in ethanol-water mixtures leads to production of the hydrogen-rich synthesis gas with hydrogen content up to 65 % The effect of various plasma generation regimes on the performance of plasma, on the hydrogen production efficiency and on the hydrogen-rich synthesis gas production was examined. A role of the composition of the ethanol-water mixture was investigated.
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| 5. |
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| 6. |
- Bernardin, Evans, et al.
(författare)
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Development of an all-SiC neuronal interface device
- 2016
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Ingår i: MRS Advances. - : Cambridge University Press. - 2059-8521. ; 1:55, s. 3679-3684
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Tidskriftsartikel (refereegranskat)abstract
- The intracortical neural interface (INI) is a key component of brain machine interfaces (BMI) which offer the possibility to restore functions lost by patients due to severe trauma to the central or peripheral nervous system. Unfortunately today’s neural electrodes suffer from a variety of design flaws, mainly the use of non-biocompatible materials based on Si or W with polymer coatings to mask the underlying material. Silicon carbide (SiC) is a semiconductor that has been proven to be highly biocompatible, and this chemically inert, physically robust material system may provide the longevity and reliability needed for the INI community. The design, fabrication, and preliminary testing of a prototype all-SiC planar microelectrode array based on 4H-SiC with an amorphous silicon carbide (a-SiC) insulator is described. The fabrication of the planar microelectrode was performed utilizing a series of conventional micromachining steps. Preliminary data is presented which shows a proof of concept for an all-SiC microelectrode device.
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| 7. |
- Grånäs, Oscar, 1979-, et al.
(författare)
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Impact of Vibrations and Electronic Coherence on Electron Transfer in Flat Molecular Wires
- 2017
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Ingår i: MRS Advances. - : Springer Science and Business Media LLC. - 2059-8521. ; 2:14, s. 811-816
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Tidskriftsartikel (refereegranskat)abstract
- Electron transfer in molecular wires are of fundamental importance for a range of optoelectronic applications. The impact of electronic coherence and ionic vibrations on transmittance are of great importance to determine the mechanisms, and subsequently the type of wires that are most promising for applications. In this work, we use the real-time formulation of time-dependent density functional theory to study electron transfer through oligo-pphenylenevinylene (OPV) and the recently synthesized carbon bridged counterpart (COPV). A system prototypical of organic photovoltaics is setup by bridging a porphyrin-fullerene dyad, allowing a photo-excited electron to flow between the Zn-porphyrin (ZnP) chromophore and the C60 electron acceptor through the molecular wire. The excited state is described using the fully self-consistent.-SCF method. The state is then propagated in time using the real-time TD-DFT scheme, while describing ionic vibrations with classical nuclei. The charge transferred between porphyrin and C60 is calculated and correlated with the velocity autocorrelation functions of the ions. This provides a microscopic insight to vibrational and tunneling contributions to electron transport in linked porphyrin-fullerene dyads. We elaborate on important details in describing the excited state and trajectory sampling.
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| 8. |
- Habibpour, Omid, 1979, et al.
(författare)
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Generic Graphene Based Components and Circuits for Millimeter Wave High Data-rate Communication Systems
- 2017
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Ingår i: MRS Advances. - : Springer Science and Business Media LLC. - 2059-8521. ; 2:58-59, s. 3559-3564
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Tidskriftsartikel (refereegranskat)abstract
- We are developing millimeter wave (mm-wave) components and circuits based on hydrogen-intercalated graphene. The development covers epitaxial graphene growth, device fabrication, modelling, integrated circuit design and fabrication, and circuit characterizations. The focus of our work is to utilize the distinctive graphene properties and realize new components that can overcome some of the main challenges of existing mm-wave technologies in term of linearity.
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| 9. |
- Havela, Ladislav, et al.
(författare)
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Strong 5f Ferromagnetism in UH3-Based Materials
- 2016
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Ingår i: MRS Advances. - : Springer Science and Business Media LLC. - 2059-8521. ; 1:44, s. 2987-2992
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Tidskriftsartikel (refereegranskat)abstract
- Several diverse types of UH3-based hydrides can be prepared by hydrogenation of bcc U-based alloys. Pair Distribution Function (PDF) analysis using high-energy X-rays identified that the (UH3)1-xMo x hydrides are nanocrystalline, with the structure motif based mainly on the β-UH3 structure. α-UH3 represents a minority component. On the other hand, PDF of the (UH3)1-xZr x hydrides corresponds well to the α-UH3 crystal structure. All the hydrides are ferromagnetic, with the Curie temperature T C reaching up to 203 K.
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| 10. |
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| 11. |
- Nygårds, Mikael
(författare)
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Relating papermaking process parameters to properties of paperboard with special attention to through-thickness design
- 2022
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Ingår i: MRS Advances. - : Springer Nature. - 2059-8521. ; 7:31, s. 789-798
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Tidskriftsartikel (refereegranskat)abstract
- A biaxial stress state has been proposed to formulate a failure criterion for paperboard during bending. About 100 paperboards have been splitted, such that top, middle, and bottom plies have been free-laid and tested in the machine direction, cross-machine direction as well as in out-of-plane direction (ZD). The purpose was to determine the failure stresses and its dependency of papermaking parameters: density, degree of orientation, and fiber length for each layer. A linear model to predict the geometrical strength of a plies was suggested. Analytically simulations of different paperboard structures behavior during bending were performed. The density of the middle ply affected the location of the failure position in ZD, as well as the maximum bending moment. The impact of orientation and degree of anisotropy was simulated, which can be used to optimize the ZD property gradient by tweaking the properties, and hence optimize paperboard performance.
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| 12. |
- Shen, L., et al.
(författare)
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A snapshot review—Fluctuations in quantum materials: from skyrmions to superconductivity
- 2021
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Ingår i: MRS Advances. - : Springer Science and Business Media LLC. - 2059-8521.
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Tidskriftsartikel (refereegranskat)abstract
- By measuring a linear response function directly, such as the dynamic susceptibility, one can understand fundamental material properties. However, a fresh perspective can be offered by studying fluctuations. This can be related back to the dynamic susceptibility through the fluctuation–dissipation theorem, which relates the fluctuations in a system to its response, an alternate route to access the physics of a material. Here, we describe a new X-ray tool for material characterization that will offer an opportunity to uncover new physics in quantum materials using this theorem. We provide details of the method and discuss the requisite analysis techniques in order to capitalize on the potential to explore an uncharted region of phase space. This is followed by recent results on a topological chiral magnet, together with a discussion of current work in progress. We provide a perspective on future measurements planned for work in unconventional superconductivity.
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| 13. |
- Vyas, Agin, 1992, et al.
(författare)
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Surface Roughening with Iron Nanoparticles for Promoted Adhesion of Spin Coated Microsupercapacitor Electrodes
- 2019
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Ingår i: MRS Advances. - : Springer Science and Business Media LLC. - 2059-8521. ; 4:23, s. 1335-1340
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Konferensbidrag (refereegranskat)abstract
- Microsupercapacitors (MSCs) are miniaturized energy storage devices that can be integrated in an on-chip platform as a component of a power supply for Internet of things' sensors. Integration of these on-chip MSCs require them to be fabricated through CMOS compatible fabrication techniques such as spin coating. One of the biggest challenges in spin coated MSCs is the poor surface adhesion. In this work, we present a CMOS compatible electrode deposition process with enhanced adhesion and retention for reduced graphene oxide (rGO) using spin coating. In order to improve the adhesion and surface uniformity of the deposited electrode material, the surface of Si/SiO 2 wafers was subjected to roughening through Fe nanoparticle formation. A 4 nm thick Fe layer deposition substantially magnified the average mean surface roughness of the substrates. In comparison with substrates without the Fe deposition, the treated ones have more than 300% improvement in surface coverage and rGO mass retention after sonication testing. These results suggest that the surface roughening has a positive influence on electrode deposition via a spin-coating method.
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