Materials Literature
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1. Introduction 148 2. Basics of X-ray and neutron scattering 149 2.1 Elastic scattering of electromagnetic radiation by a single electron 149 2.2 Scattering by assemblies of electrons 151 2.3 Anomalous scattering and long wavelengths 153 2.4 Neutron scattering 153 2.5 Transmission and attenuation 155 3. Small-angle s…
We use high-quality electrodynamics methods to study the extinction spectra of one-dimensional linear chains and two-dimensional planar arrays of spherical silver nanoparticles, placing emphasis on the variation of the plasmon resonance wavelength and width with array structure (spacing, symmetry), particle size, and…
In this paper, the electromagnetic interactions between noble metal nanoparticles are studied by measuring the extinction spectra of two-dimensional arrays of Au and Ag cylinders and trigonal prisms that have been fabricated with electron beam lithography. The nanoparticles are typically 200 nm in diameter and 35 nm i…
Images of the assembly of surfactants and synthetic lipids on the surface of carbon nanotubes were obtained by transmission electron microscopy. Above the critical micellar concentration, sodium dodecyl sulfate (SDS) forms supramolecular structures made of rolled-up half-cylinders on the nanotube surface. Depending on…
Polarized infrared optical emission was observed from a carbon nanotube ambipolar field-effect transistor (FET). An effective forward-biased p-n junction, without chemical dopants, was created in the nanotube by appropriately biasing the nanotube device. Electrical measurements show that the observed optical emission…
We demonstrate the use of individual semiconducting single-wall carbon nanotubes as versatile biosensors. Controlled attachment of the redox enzyme glucose oxidase (GOx) to the nanotube sidewall is achieved through a linking molecule and is found to induce a clear change of the conductance. The enzyme-coated tube is f…
Optical properties of porous graphite samples prepared by electrochemical etching were investigated. It is found that electrochemical etching modifies their Raman spectra and gives rise to photoluminescence. The evolution of Raman spectra at the initial etching stages is studied in detail. A model is proposed explaini…
The electrochemical behaviour of p-type silicon in dilute fluoride electrolyte has been investigated in a potential range extending up to +100 V vs SCE. Beyond the known range where the system is prone to exhibiting an oscillatory behaviour (3–8 V), two marked current rises are observed, at around 10 V and 20 V. Evide…
Hydrosilylation of 1-dodecene on porous silicon surface has been studied by calorimetric methods. Using unpurified and purified 1-dodecene, it was possible to distinguish the reactions arising from oxidation from those due to hydrosilylation reactions. A surprising change from an exothermic reaction to an endothermic…
The interaction between NO2 molecules and the array of Si nanowires composing the porous silicon skeleton is discussed. In a wide pressure regime ranging from 10–2 to 100 Torr, reactivation of the pristine acceptor atoms takes place provoking the generation of a considerable amount of free carriers inside the Si wires…
Copper can be deposited on TaN by displacement electroless plating when a surface oxide layer is removed by wet chemical etching. For application to ultralarge-scale integrated (ULSI) interconnection technology in which very thin TaN barrier films are used, it is essential to form a stable TaN film with minimal native…
This paper describes the mechanism of discharge development in non-uniform field gap in SF 6 under positive impulses with different rising steepness. Based on theoretical consideration, an expression of the transition delay time from streamer to leader is presented, which can help to better understand the process of s…
For the formation of an ordered porous structure, the distance between two nearest neighbor pores cannot be more than a certain size, otherwise random nucleated pores arise spontaneously between ordered pores. The “proximity effect” does not allow the production of macropores with variable interpore distances on the s…
With ab initio simulations based on a real-space nonequilibrium Green's function formalism, we have investigated the charging of carbon nanotube systems. The charging effects are described by capacitance coefficients, for which we provide a first-principles estimate. Specifically, the capacitance matrix of nested armc…
Abstract A diimine ligand tethered to anthracene in the 9‐position, 4′‐(9‐anthrylethyl)‐4‐methyl‐2,2′‐bipyridine (bpy‐An), was dimerized through cycloaddition photochemistry. The resultant head‐to‐tail photodimer (bpy‐PD) was used as a bridging ligand in the preparation of a new dinuclear Ru II complex, [Ru(dmb) 2 (bp…
Charge transport (CT) in a Nafion film incorporating [Ru(bpz) 3 ] 2+ (bpz = 2,2‘-bipyrazine) was investigated using a potential-step chronocouloabsorptometry technique. The reductive CT by [Ru(bpz) 3 ] 2+/+ was found to take place by a combination mechanism of physical displacement of the complex and charge hopping be…
We report on room-temperature 1.54 µm electroluminescence, for the first time, of Er,O-codoped GaAs/GaInP double-heterostructure light emitting diodes grown by organometallic vapor phase epitaxy. The luminescence is due to intra-4 f shell transition from the first excited state to the ground state of Er 3+ ions. The e…
The aim of this work is to elucidate, through density functional calculations, the role of the Si–O interface bonds on the structural, electronic and optical properties of Si nanodots in order to explain the peculiar properties of aged porous Si samples and heavily oxidized Si nanoparticles. For isolated dots we show…
A novel approach using unoxidized porous Si (UPS) as an isolation material for mixed-signal integrated circuit applications is presented. Very thick PS can be locally fabricated without severe stress problems. Relative dielectric constants of PS are adjustable from 3 to 9 by changing porosity from 78% to 24%. PS with…
The Mulliken charges of the 12-metallacrown-3 complex [(C(6)H(6))Ru(C(5)H(3)NO(2))](3) were determined by a single point analysis at the HF level. For comparison, a Mulliken population analysis was carried out for the organic analogue 12-crown-3. The partial negative charges on the O-donor atoms of the metallamacrocyc…