Materials Literature
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We present the optical properties of fully (C42F28, PF-RUB) and half-fluorinated (C42F14H14, F14-RUB) rubrene, both in thin films and as monomers in solution and compare them to hydrogenated rubrene (C42H28, RUB). All three compounds show similar optical absorption bands and photoluminescence line shapes. The results…
We report the piezoelectric and ferroelectric properties of (Na0.5Bi0.5TiO3)x–(BaTiO3)y–(Na0.5K0.5NbO3)1−x−y ceramics for Na0.5K0.5NbO3 rich end of composition (x, y ≤ 0.04 mol. %). These compositions were found to exhibit significantly improved thermal stability of piezoresponse. Variation of dielectric constant as a…
Carbon-for-nitrogen substitution (51 at% at most) was achieved in the antiferromagnetic metallic host material Mn(3)ZnN. The various carbon-doped compounds were studied using synchrotron X-ray diffraction, and their electrical resistivities, specific heats, and degrees of magnetization were measured for temperatures o…
ZnO nanoparticles with controlled sizes produced by a sol-gel method are studied by means of time-integrated as well as time-resolved photoluminescence (TRPL) spectroscopy. Room-temperature photoluminescence spectra show a blueshift of the excitonic emission with the decreasing particle size, which is attributed to th…
While a few singular reports have demonstrated carbon nanotube (CNT) transistors with subthreshold swings (SS) close to the theoretical limit (60 mV/decade), the majority of devices have more than double the target swing. Here, we show that a low temperature lanthanum oxide dielectric is able to yield a consistently a…
The comfort properties of the pique and single jersey knitted wool fabrics were investigated using the Wool ComfortMeter (WCM). The fabrics were knitted in three cover factors and treated with either plasma or a silicone softening agent and were compared with untreated fabrics. Plasma treatment did not show significan…
The temperature dependent electrical properties of epitaxial graphene grown on Si-face and C-face SiC substrates were investigated by Hall measurements, respectively. Quasi-free-standing epitaxial graphene by H2 intercalation was adopted as the control. Due to a ∼200 meV band gap, the electrical conductivities of grap…
Inorganic nanocrystals: The structures of the compounds [(PbSe)1.00]m(MoSe2)n and [(PbSe)0.99]m(WSe2)n (m≥1 and n≤5) were investigated using X-ray diffraction and scanning transmission electron microscopy, which revealed a pairing distortion of the PbSe component that is dependent on m, the thickness of the PbSe layer…
We report on the visualization of n-p junctions formed by oxygen vacancy movement under the application of an electric field in a Ca-doped BiFeO3 thin film through spatially resolved scanning photocurrent mapping. The photocurrent mapping, in conjunction with the spectroscopic approach, provides clues to local electro…
We studied the dimensionality of excitons and trions (charged excitons) in hole-doped single-walled carbon nanotubes (SWNTs) by means of photoluminescence (PL) spectroscopy. We found that the temperature ($T$) dependence of the PL intensity of the trions and excitons is significantly different, reflecting their dimens…
Abstract In this study, we investigated the synthesis of monodisperse CuO hard and hollow nanospheres with extraordinary visible‐light photocatalytic abilities for dye photodegradation. The monodisperse CuO hard nanospheres were constructed with assistance from the water‐soluble biopolymer sodium alginate (SA). In alk…
Needle-punched nonwoven fabrics are manufactured with suitable structures to develop specific property to serves specific application. This paper reviews the influence of structural parameters such as fiber orientations, packing density, specific surface area, thickness etc. on various mechanical and functional proper…
\n\t\t\t\t\tWe consider homogeneous crystallisation rates in confocal microscopy experiments on colloidal nearly hard spheres at the single particle level. These we compare with Brownian dynamics simulations by carefully modelling the softness in the colloid interactions with a Yukawa potential, which takes account of…
By creating nanostructures and controlling the hydrogen content and sp3/sp2 bonding ratio, we report the formation of very hard (35.8 GPa) hydrogenated diamond-like carbon film at a self-bias of −100 V using simple radio frequency-plasma enhanced chemical vapor deposition process. When the self-bias is varied and modi…
Abstract Organosoluble polyimide (PI)/ceramic composite films with different BN or (BN + AlN) contents were under investigation for their thermal conductive performances. The chosen polyimide constituted by 4,4′‐oxydiphthalic dianhydride/2,2‐bis(3‐amino‐4‐hydroxyphenyl)hexafluor opropane could be dissolved and cast in…
Abstract We describe the preparation, characterization and physical properties of multiwalled carbon nanotube ( MWCNT )‐filled epoxidized natural rubber ( ENR ) composites. To ensure better dispersion in the elastomer matrix, the MWCNTs were initially subjected to aminopropyltriethoxysilane ( APS ) treatment to bind a…
Abstract The thermal spin‐crossover behaviour, photoexcitation and subsequent relaxation, as well as the pressure‐induced spin‐crossover behaviour at 298 K are discussed for the non‐porous two‐dimensional Hofmann‐like coordination polymer [Fe(3‐Clpy) 2 Pd(CN) 4 ] ( 1 ). The title compound undergoes a two‐step, coopera…
Abstract A class of firefighting foams, known as aqueous film‐forming foam (AFFF), has the ability to form a film by spreading on the free surface of some hydrocarbon fuels. To find out whether this film could reduce the evaporation losses of volatile hydrocarbons, the evaporation rates of fuels covered with a film of…
A systematic set of borotellurite glasses doped with manganese (1-x) [(B(2)O(3))(0.3)(TeO(2))(0.7)]-xMnO, with x = 0.1, 0.2, 0.3 and 0.4 mol%, were successfully synthesized by using a conventional melt and quench-casting technique. In this study, the remelting effect of the glass samples on their microstructure was in…
We demonstrated a low voltage and high contrast polymer-stabilized blue phase liquid crystal (BPLC) by shifting the Bragg reflection to a red wavelength. To retain high contrast ratio, a left-handed BPLC is sandwiched between a right-handed circular polarizer and a left-handed circular analyzer. The driving voltage is…