Materials Literature
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Walking on air: Confocal laser scanning microscopy can be used to provide distinct 3D images of air at buried superhydrophobic interfaces (see picture, bright area). Two hydrophobic states, Wenzel and Cassie states, have been quantitatively visualized and distinctly identified. The 10 μm thick air cushion drastically…
We report the structure, magnetism and magnetic entropy change in a Mn-rich Ni 50− x Mn 37+ x Sn 13 Heusler alloy system in the composition range 0 ⩽ x ⩽ 4. An excess Mn content stabilizes the cubic austenite phase at room temperature. Martensitic transition decreases from 305 to 100 K with increasing Mn concentration…
Shining light: Surface enhanced Raman scattering (SERS) offers much in terms of molecularly specific information at ultrasensitive levels. Two recent breakthroughs have occured in this field. First, a new surface was developed that provides SERS information previously inaccessible, and second, a nanoparticle SERS labe…
Presently, there is a dramatically increasing interest in developing graphene-supported nanocomposites, due to their unprecedented properties. Apart from the methods exposed in previous studies, this work presents a nonaqueous approach of using atomic layer deposition (ALD) to constitute novel metal oxide-graphene hyb…
Warm-white LEDs (WLEDs) with high spectral quality and efficiency are required for lighting applications, but current experimental performances are limited. We report on nanocrystal quantum dot (NQD) hybridized WLEDs with high performance that exhibit a high luminous efficacy of optical radiation exceeding 350lm/W(opt…
Magnetization measurements have been carried out at high pressure up to 12.1 kbar for ${\text{Co}}_{2}\text{VAl}$ and ${\text{Co}}_{2}\text{VGa}$ with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for ${\text{Co}}_{2}\text{VGa}$. This is an experimental observatio…
We report the influence of trap states on charge transport through films of mixed CdTe and CdSe nanocrystals (NCs) between lateral electrodes, through layered films of CdTe and CdSe NCs in a layered geometry, and through films of CdTe/CdSe nanobarbells in a layered geometry. We find that an electron trapping state on…
Multi-walled carbon nanotubes (MWCNTs) were layer-by-layer assembled onto silica microspheres to form MWCNTs/SiO(2) composites and were characterized by surface analysis, elemental analysis, and contact angle. The composite was used as a stationary phase in HPLC for the separation of many kinds of aromatic compounds.…
Stimuli-responsive organic-inorganic hybrid spheres were synthesized by coating the colloidal polystyrene spheres with polyelectrolyte-protected aminoclay, Mg phyllo(organo)silicate layers in a layer-by-layer method. The clay layers are sandwiched between the polyelectrolyte layers. The aminoclay swells in water due t…
The healing of graphene grown from a metallic substrate is investigated using tight-binding Monte Carlo simulations. At temperatures (ranging from 1000 to 2500 K), an isolated graphene sheet can anneal a large number of defects suggesting that their healings are thermally activated. We show that in the presence of a n…
A 'living' controlled hydrogel formation method was first reported to create loose and compact in situ biodegradable hydrogels. The method executed under mild reaction conditions can conveniently tailor the hydrogel properties, and it has the potential to develop into a powerful tool for the design, synthesis, and sel…
A core−shell carbon nanotube/conducting polymer hybrid, using an imidazolium-salt-based ionic liquid as a linker, has been developed for large-scale solution processing of CNTs. Dye-sensitized solar cells (DSCs) with the solution processed hybrid film as the counter electrode exhibit comparable photovoltaic performanc…
For the widely used Au nanoparticles (AuNPs)-based colorimetric probe, AuNPs generally change from the dispersion to the aggregation state and corresponding colors turn from red to blue concomitantly. In previous studies, there are few probes based on the anti-aggregation of AuNPs though anti-aggregation of AuNPs is p…
The phonon dispersion of graphene is known to display two strong Kohn Anomalies (kinks) in the highest optical branch (HOB) at the high-symmetry points Γ and K [ Piscanec , S. ; et al. Phys. Rev. Lett. 2004 , 93 , 185503 ]. The phonon slope around the Kohn anomalies is related to the electron-phonon-coupling (EPC) wit…
Epitaxy is a widely used method to grow high-quality crystals. One of the key challenges in the field of inorganic solids is the development of epitaxial single-crystal nanostructures. We describe their formation from block copolymer self-assembly-directed nanoporous templates on single-crystal Si backfilled with Si o…
The buildup of polyelectrolyte multilayers (PEMs), fabricated by the layer-by-layer (LBL) assembly, was followed in situ by the combination of a quartz crystal microbalance with dissipation monitoring (QCM-D) and spectroscopic ellipsometry in a single device. PEMs composed of poly(allylamine hydrochloride) (PAH) and p…
Ultrafast fiber lasers with short pulses and broad bandwidth are in great demand for a variety of applications, such as spectroscopy, biomedical diagnosis and optical communications. In particular sub-200fs pulses are required for ultrafast spectroscopy with high temporal resolution. Graphene is an ideal ultra-wide-ba…
In this review we highlight recent advances in the understanding of biosilica production, biomodification of diatom frustules and their subsequent applications in bio/chemical sensors, and as a model membrane for filtration and separation.
We investigated the TiO 2 anatase (101) and (001) interfaces dipped in bulk water on the atomic scale by first-principles density-functional molecular dynamics simulations. We verified that the water adsorption models proposed in the previous studies with less than a couple of water layers on the vacuum surfaces still…
One emergent property of ferroelectric nanoparticles is the sized-induced structural distortion to a high-symmetry paraelectric phase at small particle sizes. Finite length scale effects can thus be advantageously employed to elucidate ferroelectric transition mechanisms. In this work, we combine infrared spectroscopy…