Materials Literature
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Dielectrophoresis (DEP) has been widely used to manipulate, separate, and concentrate microscale particles. Unfortunately, DEP force is difficult to be used in regard to the manipulation of nanoscale molecules/particles. For manipulation of 50- to 100-nm particles, the electrical field strength must be higher than 3 ×…
We have reinvestigated the optical spectroscopy of C132 graphene quantum dots by absorption, selective fluorescence, excitation and time-resolved spectroscopy, the external heavy atom effect, and DFT based quantum chemical calculations. In particular, wavelength-selective photobleaching provides strong evidence for th…
Fabricating stretchable conductors through simple, cost-effective and scalable methods is a challenge. Here, we report on an approach used to develop nanowelded Ag nanowire/single-walled carbon nanotube (AgNW/SWCNT) hybrid films to be used as high-performance stretchable conductors. Plasmonic welding, which was done a…
PURPOSE: To predict signal-to-noise ratio (SNR) trends and absorbed energy in magnetic resonance imaging (MRI) of the brain up to 14T. MATERIALS AND METHODS: A human head in an eight-channel transmit/receive coil was simulated with Maxwell and Bloch equations to determine excitation homogeneity with radiofrequency (RF…
Gold nanorods exhibit intense optical absorption bands in the near-infrared region of principal interest for applications in biomedical optics, which originate from sharp plasmon resonances. This high absorbance, combined with the biochemical inertness and targetability of gold nanoparticles, makes these materials exc…
The p-n tandem design of a sensitized solar cell is a novel concept holding the potential to overcome the efficiency limitation of conventional single-junction sensitized solar cells. Significant improvement of the photocurrent density (Jsc) of the p-type half-cell is a prerequisite for the realization of a highly eff…
In the classical analysis of charge transport in solids by Lampert in 1956 an Ohmic current is attributed to the presence of a background carrier density due to (unintentional) doping. We demonstrate that Ohmic currents are also observed in undoped semiconductors as a result of diffusion of charge carriers from the co…
Recently, Graphene nanosheets (GNS) decorated semiconductor photocatalysts have received more attention because of their enhanced photocatalytic activity caused by their varying band gap energy and interfacial charge transfer effect. However, the effects of band gap variation and interfacial charge transfer are rarely…
Levulinic acid is one of the top value-added chemicals. It can be obtained through the hydrolysis of some types of saccharides such as glucose, the constituent unit of cellulose. Cellulose is the most abundant natural resource on this planet; however, its rigid structure prevents the easy utilization of cellulose. In…
The poor internal quantum efficiency (IQE) arising from high recombination and insufficient absorption is one of the critical challenges toward achieving high efficiency water splitting in hematite (α-Fe2O3) photoelectrodes. By combining the nanowire (NW) geometry with the localized surface plasmon resonance (LSPR) in…
A cocrystal screening of a series of chiral target compounds was performed in order to investigate the propensity for two optically active compounds to cocrystallize in an enantiospecific manner. Thirteen novel cocrystal systems were identified, out of which 11 are enantiospecific and two present a diastereomeric cocr…
MOTIVATION: Structural information of macromolecular complexes provides key insights into the way they carry out their biological functions. The reconstruction process leading to the final 3D map requires an approximate initial model. Generation of an initial model is still an open and challenging problem in single-pa…
Carbon "quantum" dots (or carbon dots) have emerged as a new class of optical nanomaterials. Beyond the widely reported bright fluorescence emissions in carbon dots, their excellent photoinduced redox properties that resemble those found in conventional semiconductor nanostructures are equally valuable, with photon-el…
The coordinative chain transfer co- and ter-polymerizations of myrcene, isoprene and styrene have been achieved using Cp*La(BH 4 ) 2 (THF) 2 (Cp* = pentamethylcyclopentadienyl) combined with magnesium dialkyl and aluminum dialkyl. New highly stereoregular poly(myrcene- co -styrene), poly(myrcene- co -isoprene), and po…
Controlling the morphology of nanowires in bottom-up synthesis and assembling them on planar substrates is of tremendous importance for device applications in electronics, photonics, sensing and energy conversion. To date, however, there remain challenges in reliably achieving these goals of orientation-controlled nan…
Abstract Die reversible Umwandlung von Wasser in H2 und O2 sowie die Rekombination von H2 und O2 zu H2O unter Gewinnung von Energie ist die Basis für einen vollständig nachhaltigen Zyklus der Energiekonversion und ‐speicherung. Die Realisierung dieses Ziels wird jedoch von der Nichtverfügbarkeit effizienter Katalysato…
Structural modules used for assembling molecular semiconductors have typically been chosen to give desirable optical and electronic properties. Growing evidence shows that chemical functionalities should be considered for controlling molecular shape, which is important for function because of its influence on polymer…
Uniform and high-quality graphene oxide thin films were prepared using a dip-coating approach and were reduced to highly electrically conductive graphene nanosheet (GN) transparent conductive films (TCFs) using hydriodic acid. Silver nanowires (AgNWs), which were modified using thiophenol and exhibited a high aspect r…
The rigid and angular tetracarboxylic acid 1,3-bis(3,5-dicarboxyphenyl)imidazolium (H4L(+)), incorporating an imidazolium group, has been used with different pyridine-based linkers to construct a series of non-interpenetrated cationic frameworks, {[Zn2(L)(bpy)2]·(NO3)·(DMF)6·(H2O)9}n (1), {[Zn2(L)(dpe)2]·(NO3)·(DMF)3·…
Superoxide radical (O 2 – ) and singlet molecular oxygen ( 1 O 2 ) were successfully detected on gold-nanoparticle-deposited titanium dioxide (AuNP/TiO 2 ) under visible-light irradiation for the first time. For the samples prepared with 13 commercially available TiO 2 powders, the generations of O 2 – and 1 O 2 in th…