Materials Literature
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The deficiency of Y3Al5O12:Ce (YAG:Ce) luminescence in red component can be compensated by doping Gd(3+), thus lead to it being widely used for packaging warm white light-emitting diode devices. This article presents a systematic study on the photoluminescence properties, crystal structures and electronic band structu…
Gold nanostars (NStars) are highly attractive for biological applications due to their surface chemistry, facile synthesis, and optical properties. Here, we synthesize NStars in HEPES buffer at different HEPES/Au ratios, producing NStars of different sizes and shapes and therefore varying optical properties. We measur…
On a subnanometer scale, an only one-atom difference in a metal cluster may cause significant transitions in the catalytic activity due to the electronic and geometric configurations. We now report the atomicity-specific catalytic activity of platinum clusters with significantly small atomicity, especially below 20. T…
This work describes the potential of thin, spray-deposited, large-area poly(3,4-ethylenedioxythiophene)/poly(styrene-4-sulfonate) ( PEDOT: PSS) conducting polymer films for use as transparent supercapacitor electrodes. To facilitate this, we provide a detailed explanation of the factors limiting the performance of suc…
Supercapacitors suffer either from low capacitance for carbon or derivate electrodes or from poor electrical conductivity and electrochemical stability for metal oxide or conducting polymer electrodes. Transition metal nitrides possess fair electrical conductivity but superior chemical stability, which may be desirabl…
A simple and versatile method for general synthesis of uniform one-dimensional (1D) M(x)Co(3-x)S4 (M=Ni, Mn, Zn) hollow tubular structures (HTSs), using soft polymeric nanofibers as a template, is described. Fibrous core-shell polymer@M-Co acetate hydroxide precursors with a controllable molar ratio of M/Co are first…
Reduced graphene oxide-wrapped MoO3M (rGO/MoO3 ) is prepared by a novel and simple method that is developed by using a metal-organic framework as the precursor. After a two-step annealing process, the obtained rGO/MoO3 composite is used for a high-performance supercapacitor electrode. Moreover, an all-solid-state flex…
The properties of two-dimensional (2D) materials depend strongly on the chemical and electrochemical activity of their surfaces. MXene, one of the most recent additions to 2D materials, shows great promise as an energy storage material. In the present investigation, the chemical and structural properties of individual…
Our ability to sense chemistry and biology in challenging scenarios, such as implantable devices for monitoring our health, or the quality of water in rivers and lakes has not advanced significantly since the fundamental breakthroughs in chem/bio-sensors of the 1970’s and 1980’s. It is becoming clear that in order to…
The wear properties and wear surfaces microstructure of TC4 alloy were studied with GCr15 and SiC counterparts, respectively. The results show that the friction coefficients of TC4 alloy with GCr15 was higher and the mass loss was lower compared with those of SiC. The wear mechanisms of TC4 alloy with GCr15 and SiC co…
Το φαινόμενο της ταυτόχρονης απορρόφησης δύο φωτονίων από ένα άτομο ή μόριο ήταν ένα από τα πρώτα μη γραμμικά οπτικά φαινόμενα που παρατηρήθηκαν πειραματικά αμέσως μετά την κατασκευή ισχυρών παλμικών laser. Το φαινόμενο της διφωτονικής απορρόφησης αποτελεί το φυσικό υπόβαθρο μιας πληθώρας τεχνολογικών εφαρμογών όπως:…
International audience
First principles calculations within the density functional theory have been used to study the main structural, energetic, electronic, and optical properties of hydrogenated Si and Ge in the 2D structures (silicane and germanane). The calculations of the energetic stability were performed using the GGA-PBE approximati…
Adaptive divergence at the microgeographic scale has been generally disregarded because high gene flow is expected to disrupt local adaptation. Yet, growing number of studies reporting adaptive divergence at a small spatial scale highlight the importance of this process in evolutionary biology. To investigate the gene…
En este trabajo se estudian, a partir de la teoría de las ecuaciones diferenciales ordinarias (e.d.o.’s) de tipo lineal, diferentes versiones de un modelo sobre la interacción de la inflación y el desempleo, que en la literatura especializada se conoce como el modelo de Phillips-Friedman. El estudio incluye la obtenci…
The inelastic (n,n’) reactions on actinide nuclei cannot easily be measured, especially those which populate states of low excitation energies. Model calculations are therefore need to interpolate between (and extrapolate from) the data for those discrete and continuum states that can be measured. Such models are crit…
National audience
In this paper we introduce a general abstract formulation of a variational\nthermomechanical model, by means of a unified derivation via a generalization\nof the principle of virtual powers for all the variables of the system,\nincluding the thermal one. In particular, choosing as thermal variable the\nentropy of the…
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