Materials Literature
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The experimental evidences of the cooperative energy transfer from Tm3+ to Yb3+ have been presented by the photoluminescence properties of YPO4:Yb3+, Tm3+, and the decay lifetime curves of the G14 emission of Tm3+. Near-infrared quantum cutting involving the F25/2→F27/2 emission of Yb3+ (about 970–1010 nm) is achieved…
Gold nanorods (GNRs) with different localized surface plasmon resonance (LSPR) peaks and different thicknesses of polymer-coating were synthesized to validate that the distinct GNR-based quenching process of quantum dot (QD) emission follows the metal surface energy transfer theory. The quenching efficiency is directl…
A series of 14 meso-polyarylamine-BODIPY (borondipyrromethene) hybrids of the general structure A were synthesized. Two methods were used to prepare them. The first protocol involved a direct Liebeskind-Srogl cross-coupling of thiomethylbodipys 1-2 with arylaminoboronic acids (4 examples, 75-98%). The second method in…
By numerically solving the equations of motion for atomic spins we show that internal spin-wave processes in large enough magnetic particles, initially in unstable states, lead to complete magnetization reversal and thermalization. The particle's magnetization strongly decreases in the middle of reversal and then reco…
Super water-repellent surfaces occur naturally on plants and aquatic insects and are created in the laboratory by combining micro- or nanoscale surface topographic features with hydrophobic surface chemistry. When such types of water-repellent surfaces are submerged they can retain a film of air (a plastron). In this…
Incongruent melting phenomenon shows the feasibility of multilevel control using the phase-change material Ga2Te3Sb5 (Ga-TS). Electrical results showed that Ga-TS cells require 25% less RESET current than do GST cells. Meanwhile it possesses a high programming speed, ultralong data retention extrapolated to one millio…
Interaction of massless electrons with the acoustic phonons is studied in two-dimensional (2D) graphene at low temperatures by calculating phonon drag thermopower ${S}^{g}$ and hot-electron energy-loss rate $F(T)$. ${S}^{g}$ and $F(T)$ are studied as a function of temperature $T$ and electron concentration ${n}_{s}$.…
We present results of the experimental investigation of the low-frequency noise in bilayer graphene transistors. The back-gated devices were fabricated using the electron beam lithography and evaporation. The charge neutrality point for the transistors was around +10 V. The noise spectra at frequencies f > 10-100 Hz w…
Magnetic-glass is a recently identified phenomenon in various classes of magnetic systems undergoing a first order magnetic phase transition. We shall highlight here a few experimentally determined characteristics of magnetic-glass and the relevant set of experiments, which will enable to distinguish a magnetic-glass…
Spin-cast all-inorganic nanoparticle solutions have been used to make a CdTe/CdSe solar cell with an efficiency of up to 2.6% using air stable electrodes and without an additional alumina layer. The type of junction as well as the nonselective nature of the electrodes of these devices are explored.
We have performed extensive ab initio calculations to investigate phonon dynamics and their possible role in superconductivity in ${\text{BaFe}}_{2}{\text{As}}_{2}$ and related systems. The calculations are compared to inelastic neutron scattering data that offer improved resolution over published data [Mittal et al.,…
The dominant point defects in p-type NiO films were determined by analyzing the coordination number (CN) change with various annealing temperatures and the composition profile of double-layer films deposited individually in oxygen and in argon atmospheres. The results show that the nonstoichiometry of sputtered NiO fi…
This paper proposes a polaronic stacking fault defect model as the origin of the huge dielectric properties in CaCu 3 Ti 4 O 12 (CCTO) materials. The model reconciles the opposing views of researchers on both sides of the intrinsic versus extrinsic debate about the origin of the unusually high values of the dielectric…
The scheelite type laser crystals LiREF4 melt congruently only for RE being one of the elements Er, Tm, Yb, Lu, or possibly Y, respectively. For RE = Eu, Gd, Tb, Dy, or Ho the corresponding scheelites undergo a peritectic melting under the formation of the corresponding rare earth fluoride. The melting behavior of LiR…
We propose a method of measuring the electron temperature T_{e} in mesoscopic conductors and demonstrate experimentally its applicability to micron-size graphene devices in the linear-response regime (T_{e} approximately T, the bath temperature). The method can be especially useful in case of overheating, T_{e}>T. It…
We investigate the motion of a nano tippe top, which is formed from a C60 fullerene, and which is assumed to be spinning on either a graphene sheet or the interior of a single-walled carbon nanotube. We assume no specific geometric configuration for the top, however for example, the nano tippe top might be formed by j…
The transition from n = 0 to n = 2 is revealed where n is the number of components of ordering field. The critical exponents are estimated. In frameworks of scaling theory of phase transitions and critical phenomena the results obtained are in a good agreement with experimental and theoretical data.
We report the unexpected evolution, with thermal and magnetic-field (H) variations, of the interrelation between the polarization P, magnetization M, and spiral wave vector Q in CoCr2O4, which has a ferrimagnetic conical-spiral magnetic order. For example, P suddenly jumps and changes its sign at the magnetic lock-in…
Single-phase multiferroic BiFeO3 ceramics were fabricated using pure precipitation-prepared BiFeO3 powder. Dielectric response of BiFeO3 ceramics was investigated over a wide range of temperature and frequency. Our results reveal that the BiFeO3 ceramic sintered at 700 °C exhibited high dielectric permittivity, and th…
Silver nanocrystals encapsulated in mesoporous silica nanoparticles are prepared by coating hydrophobic silver nanocrystals with amphiphilic surfactants and growing mesostructured silica around the materials. The nanoparticles can be used as antimicrobial agents for both Gram-positive and -negative bacteria through ox…