Materials Literature
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The deposition effect of metals on graphene was studied by in situ field effect transistor (FET) measurements in high vacuum. Metals such as gold (Au), silver (Ag), and copper (Cu) were deposited onto clean graphene surfaces, followed by FET measurements. The results show that Ag and Cu cause a shift in the Fermi leve…
Macromolecules are a minority but important component of the minerals formed by living organisms, or biominerals. The role these macromolecules play at the early stages of biomineral formation, as well as their long-term and long-range effects on the mature biomineral, is poorly understood. A 42-amino acid peptide, as…
We have studied adiabatic temperature change ΔTad in a Ni50Mn36Co1Sn13 metamagnetic shape memory alloy. An irreversible character of ΔTad has been observed in the vicinity of the reverse martensitic transformation. In this region, cyclic application of the magnetic field converts comparatively large inverse magnetocal…
In this letter, we show how high-resolution scanning tunneling microscopy (STM) imaging can be used to reveal that certain edges of micromechanically exfoliated single layer graphene crystals on silicon oxide follow either zigzag or armchair orientation. Using the cleavage technique, graphene flakes are obtained that…
We report a highly efficient method for the synthesis of poly(3-hydroxybutyrate) by the carbonylative polymerization of propylene oxide. The use of compatible epoxide carbonylation and lactone polymerization catalysts allows for a one-pot reaction that eliminates the need to isolate and purify the toxic beta-butyrolac…
The magnetization reversal mechanisms in a La0.7Sr0.3MnO3/SrRuO3 superlattice with ultrathin individual layers were studied. Due to the strong exchange bias between La0.7Sr0.3MnO3 and SrRuO3 layers inverted hysteresis loops were observed at temperatures below 62 K; at higher temperatures the superlattice showed an unc…
A FRET-bearing poly(ethylene glycol) (PEG) conjugate fluoresces at 520 nm when it is cleaved off nanoparticles (NPs; see picture). When the NPs were targeted on cancer cell lines, the reducing endosomal environment caused the cleavage of the disulfide bond and the shedding of the PEG layer.
Methods are presented to synthesize suspensions of chemically and shape anisotropic colloids on submicrometer length scales. Particles are synthesized through seeded emulsion polymerization where a weakly cross-linked seed is swollen with monomer that phase separates at the reaction temperature resulting in a protrusi…
A demonstration of magnetization reversal via the application of electric field across a multiferroic heterostructure, consisting of a FeCoV ribbon bonded to a lead magnesium niobate-lead titanate crystal, is presented. The magnetization switching occurs by an abrupt change in magnetization near ferromagnetic coercivi…
Channel your energy: Bodipy dyes were linked covalently by a method involving three key steps, including a carboformylation reaction. All multichromophoric dyes exhibited highly efficient photoinduced energy transfer to the terminal Bodipy modules, which fluoresced at 652 nm with 57 % quantum efficiency (see absorptio…
The formation of a shish kebab (SK) structure, where carbon nanotubes (CNTs) serve as shish and polymer lamellae serve as kebab, is particularly interesting and provides a novel way to enhance the polymer-CNT interface. A fine SK structure is achieved through melt spinning. High density polyethylene and pristine CNTs…
We propose a model to calculate the electronic structure of hydrotalcite-like compounds by using periodic boundary conditions and ab initio density functional theory (DFT). The proposed method to build up layered double hydroxides (LDHs) was tested for Zn 2/3 Al 1/3 (OH) 2 Cl 1/3 · 2 / 3 H 2 O, Zn 2/3 Al 1/3 (OH) 2 (C…
This Perspective describes studies aimed at effective excitation of molecules by localized surface plasmon polaritons. Recently developed bottom-up and top-down techniques allow the controlled fabrication of well-defined metal structures exhibiting desirable localization of plasmon energy. Under certain conditions, mo…
Boron-doped diamond is a promising transducer material for numerous devices which are designed for contact with electrolytes. For optimized electron transfer the surface of diamond needs to be hydrogen terminated. Up to now H-termination of diamond is done by plasma chemical vapor deposition techniques. In this paper,…
This paper presents a "one-spot" procedure to fabricate polystyrene/silica (PS/SiO(2)) hybrid hollow spheres. In this approach, when poly(vinylpyrrolidone)-stabilized PS colloids were deposited by sol-gel derived silica layer under acidic medium, it was interesting to find that the PS/SiO(2) core-shell colloids gradua…
Thin films of polyaniline (PANi) and PANi:titanium oxide (TiO2) composites have been synthesized by sol—gel spin coating technique. The TiO2 powder of particle size 50–60 nm was synthesized by sol–gel technique and the polyaniline was synthesized by chemical oxidative polymerization of aniline. The composite films wer…
We accomplished a facile and scalable route to linearly stacked, one-dimensional metal nanowire assembly via soft graphoepitaxy of block copolymers. A one-dimensional nanoscale lamellar stack could be achieved by controlling the block copolymer film thickness self-assembled within the disposable topographic confinemen…
Wechselwirkungen auf allen Ebenen: Ein supramolekulares Polymer mit hohem Polymerisationsgrad wurde auf der Basis mehrfacher wirtstabilisierter Charge-Transfer-Wechselwirkungen konstruiert (siehe Bild; DADV: ein Dianthracenylbis(bipyridiniumbromid), CB[8]=Cucurbit[8]uril). Wechselwirkungen zwischen Ketten des supramol…
Temperature- and bias voltage-dependent transport measurements of magnetic tunnel junctions (MTJs) with perpendicularly magnetized Co/Pd electrodes are presented. Magnetization measurements of the Co/Pd multilayers are performed to characterize the electrodes. The effects of the Co layer thickness in the Co/Pd bilayer…
We report on terahertz (THz) radiation under electrical pumping from a degenerate semiconductor possessing an electron accumulation layer. In InN, the random grating formed by topographical defects provides high-efficiency coupling of surface plasmon polaritons supported by the accumulation layer to the THz emission.…