The reverse bias leakage current in macroscopic GaN Schottky diodes is found to be insensitive barrier height. Using a scanning current–voltage microscope, we show that the occurs at small isolated regions, while most of sample insulating. By comparing maps topographic images and transmission electron microscopy results, conclude primarily dislocations with screw component. Furthermore, for fixed dislocation density, V/III ratio during molecular beam epitaxial growth strongly affects...

The photosystem I (PS I) protein is one of nature's most efficient light harvesting complexes and exhibits outstanding optoelectronic properties. Here we demonstrate how metal nanoparticles which act as artificial antennas can enhance the absorption protein. This hybrid system shows an increase in circular dichroism over entire band rather than at specific plasmon resonance wavelength spherical (NPs). explained by broad-resonant nonresonant field enhancements caused NP aggregates, high...

The large multiprotein complex, photosystem I (PSI), which is at the heart of light-dependent reactions in photosynthesis, integrated as active component a solid-state organic photovoltaic cell. These experiments demonstrate that photoactive megadalton protein complexes are compatible with solution processing organic-semiconductor materials and operate dry non-natural environment very different from biological membrane.

The photoelectronic nature of a dried photosystem I protein attached to metal surface is studied using various spectroscopic techniques. proteins are found be optically active after the chemical adsorption. In addition, energy-resolved measurements indicate that interaction with leads new molecule/substrate states, yielding energy states different from those individual components. Such interactions increase spectral-response range beyond absorption spectrum and expected improve...

We present an electroluminescence test structure which consists of InGaN/GaN multiquantum well as active region on the top AlGaN/GaN multilayer grown by metalorganic vapor phase epitaxy Si(111) substrate. The integral room-temperature spectrum reveals a peak emission wavelength 467 nm and significantly higher brightness than identical reference sapphire In microelectroluminescence imaging, two peaks at 465 476 can be separated originating from locally different areas diode....

A method for constructing peptide-nanotube-based films is demonstrated. centimeter-sized film of diphenylalanine successfully formed. The formation process includes the dissociation nanotubes in a polar cosolvent solution and their recrystallization spherulitic form on solid substrates, while preserving basic crystallographic structure (see figure cover). In addition, silver-embedded peptide nanotube composite networks are created.

Abstract Although the negative consequences of global phenomenon jellyfish (JF) swarms are well recognized, use their biomass for practical applications is mostly limited to a niche in Asian food industry. This fact quite surprising since JF's comprises useful biomaterials such as Q‐mucin glycoprotein and collagen. In this work, JF biomass, collected from two different species, used prepare electrospun scaffolds composed nanometric “core–shell”‐type fibers, which adjustment electrospinning...

Biofilms are responsible for about considerable amounts of cases bacterial infections in humans. They considered a major threat to transplant and chronic wounds patients due their highly resistant nature against antibacterial materials the limited types techniques that can be applied remove them. Here we demonstrate successful in-situ bio-assisted synthesis dual functionality nanoparticles composed Silver Gold. This is done using jellyfish-based scaffold, an material as templating host...

Here, we demonstrate through AFM imaging and CD spectroscopy that the binding of silver ions (Ag+) to poly(dGdC), a double-stranded (ds) DNA composed two identical repeating strands, at stoichiometry one Ag+ per GC base pair induces one-base shift strand relative other. This results in ds nucleic acid-Ag+ conjugate consisting alternating CC GG pairs coordinated by ions. The proposed organization is supported our Quantum Mechanical (QM) Molecular Mechanics (MMs) calculations. reduction...

Molecular-based electroactive devices (see image) are constructed using nanocavity architecture and ferrocene-based molecular structures. The reliable operation of these is demonstrated by transport measurements. Two negative differential resistance peaks observed indicating that both redox resonance processes occur. Supporting information for this article available on the WWW under http://www.wiley-vch.de/contents/jc_2296/2008/z700372_s.pdf or from author. Please note: publisher not...

The electronic coupling between the photoactive proteins and semiconductors can be used for fabrication of a hybrid biosolid-state electrooptical devices. robust cyanbacterial nanosized protein-chlorophyll complex photosystem I (PS I) generate photovoltage 1 V with quantum efficiency ∼1 as phototransistor gate. A functional dry-oriented junction was fabricated by covalently binding genetically engineered cysteine mutants PS to chemisorbed small connecting molecules on GaAs surface. Kelvin...

A method of synthesizing stable chiral Ag nanoparticles inside a natural mucin glycoprotein is demonstrated. The reaction carried out without the help an external reducing agent, by utilizing properties host mucin. spectrum detected in visible range, indicating formation new type nanoparticles-containing biomaterial.

The photosystem reaction center I is covalently bound to carbon nanotubes using carbodiimide chemistry. hybrid systems are characterized by atomic force microscopy, and UV-VIS spectroscopy, indicating a high degree of conjugation between the nanotubes. Three different architectures for optoelectronic circuits presented, which have potential serve as basis molecular devices.

We suggest a universal method for the mass production of nanometer-sized molecular transistors. This vertical-type device was fabricated using conventional photolithography and self-assembly methods processed in parallel fashion. used this transistor to investigate transport properties single layer bovine serum albumin protein. 4-nm-channel exhibits low operating voltages, ambipolar behavior, high gate sensitivity. The operation mechanism new is suggested, charge transfer through protein explored.

Nature's ability to form stable and controllable host-guest systems is exploited construct a new type of robust matrix biomaterial, which used for the formation protein luminescent films devices. This simple methodology involves extraordinary capabilities mucin proteins host hydrophobic dyes. It shown that large variety can be formed.<?br?>

A vertical gate symmetrical molecular transistor is demonstrated. It includes self-assembled monolayer of ferrocene molecules chemically bonded to be a flat Au source and nanoparticles drain electrodes while gated with the central electrode. Using this configuration, we show that negative differential resistance, behavior, rectification effects can tuned by controlling voltage. The I–V curves shift from symmetric strongly rectifying over voltage range few tenths volts around threshold value...

Abstract The demonstration of reliable and stable white light‐emitting diodes (LEDs) is one the main technological challenges LED industry. This usually accomplished by incorporation rare‐earth elements (REEs) compounds within an external polymeric coating a blue allowing generation light. However, due to both environmental cost issues, development low‐cost REE‐free coatings, which exhibit competitive performance compared conventional great importance. In this work, formation demonstrated....

Transparent conductive electrodes (TCEs) are produced using a bottom-up approach. Hydrophobically coated gold nanoparticles (Au NPs) assembled within surfactant monolayer templates formed at the air/water interface. The Au NP network is then transferred onto solid substrates and becomes scaffolding for further enhancement. resultant thin films exhibit excellent transparency electrical conductivity from nanometer to centimeter scales.

Control over molecular scale electrical properties within nano junctions is demonstrated, utilizing site-directed C60 targeting into protein macromolecules as a doping means. The molecules, self-assembled in miniaturized transistor device, yield robust and reproducible operation. Their device signal dominated by an active center that inverts affinity upon guest incorporation thus controls the of entire macromolecule. We show how leading routes electron transport can be drawn, spatially...

Biological and synthetic molecular motors, fueled by various physical chemical means, can perform asymmetric linear rotary motions that are inherently related to their shapes. Here, we describe silver-organic micro-complexes of random shapes exhibit macroscopic unidirectional rotation on water surface through the release cinchonine or cinchonidine chiral molecules from crystallites asymmetrically adsorbed complex surfaces. Computational modeling indicates motor is driven a pH-controlled...

In this paper several electron spin resonance--scanning tunneling microscopy (ESR-STM) experiments are described. technique, the tip of a STM scans surface that contains isolated paramagnetic centers. The individual centers apply time-dependent perturbation on electrons, giving rise to component current---at Larmor frequency [J(${\mathrm{\ensuremath{\omega}}}_{\mathit{L}}$)]. This occurs only when region is close center. Therefore, J(${\mathrm{\ensuremath{\omega}}}_{\mathit{L}}$) spatially...

Interfacing proteins with electrode surfaces is important for the field of bioelectronics. Here, a general concept based on phage display presented to evolve small peptide binders immobilizing and orienting large protein complexes semiconducting substrates. Employing this method, photosystem I incorporated into solid-state biophotovoltaic cells. Due high internal efficiency multiprotein complex (PSI) perform light harvesting charge separation, key component photosynthesis potentially enables...

We prepared a solution-processed film comprising drop-casted mixture of melamine-diacetylene and perylene bis(dicarboximide) (PDI). show that the diacetylene monomers adopt distinct crystalline organization in presence PDI residues. Importantly, diacetylene/PDI exhibits ultraviolet light-induced conductivity, ascribed to effective transport charge carriers conjugated polymerized network.