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  • Articles  (23)
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  • 1995-1999  (23)
  • Electrical Engineering, Measurement and Control Technology  (23)
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  • Articles  (23)
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  • 1
    Electronic Resource
    Electronic Resource
    Determination of the electroaffinity and potential barrier heights at polymer/ metal interfaces of poly(4,7-benzothiophene vinylene) (PBTV) (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 181-186 
    Details
    ISSN: 1057-9257
    Keywords: poly(4,7-benzothiophene vinylene) ; polymer interfaces ; conjugated polymers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: In this paper we determine the LUMO level position of poly(4,7-benzothiophene vinylene) (PBTV), a heterocyclic poly(phenylene vinylene) (PPV) analogue, using tunnelling current measurements. We compare the energy level positions with those measured for PPV and determine their shifts. The experimental results are compared with theoretical predictions and good agreement is observed. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    The X-ray crystal and molecular structure of [Ba(TDFND)2.tetraglyme],[Ba(TDFND)2.tetraglyme] is 2,5,8,11,14-pentaoxapentadecane-bis (1′,1′,1′,2′,2′,3′, 3′,7′,7′,8′,8′,9′,9′,9′-tetradecafluorononane-4′,6′-dionato)barium(II). Full bond lengths and angles, atomic co-ordinates, isotropic temperature factors are available form the Cambridge Crystallographic Data Centre. For ordering instructions see Notes for Contributors. the first molten barium precursor for MOCVD applications (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 5 (1995), S. 1-10 
    Details
    ISSN: 1057-9257
    Keywords: barium ; volatile ; β-diketone ; X-ray structure ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: At 150 K [Ba(TDFND)2, tetraglyme] crystallises in the P1/c space group with a = 17.15(2) Å b = 10.735(5) Å, c = 22.830(7) A, β = 97.56 (7)°, V = 4165 (5) Å3, Z=4. R1 = 0.0435, wR2 = 0.1079. The barium atom is nine-co-ordinate, with binding to all the O atoms. The two BaTDFND rings are planar but tilted by 26° from being co-planar. The five O atoms of the tetraglyme ligand are also essentially co-planar, but this plane subtends angles of 88.8(1)° and 67.4(1)° to the two BaTDFND planes. The Ba—O (TDFND) bond lengths are longer than for other related compounds, but the Ba—O (tetraglyme) bond lengths are similar to those in [Ba(HFA)2.tetraglyme] (HFA ≡ CF3C(O)CHC(O)CF3). The low melting point and the fact that [Ba(TDFND)2.tetraglyme], alone of barium complexes of this kind, can be evaporated without decomposition at 1 atm are attributed to lower intermolecular forces for this compound and to its greater thermal stability.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860050103
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  • 3
    Electronic Resource
    Electronic Resource
    Filament-activated chemical vapour deposition of nitride thin films (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 135-146 
    Details
    ISSN: 1057-9257
    Keywords: hot filament chemical vapour deposition ; CVD ; high-rate deposition ; ammonia ; silicon nitride ; aluminium nitride ; titanium nitride ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: We have applied the novel method of hot filament-activated chemical vapour deposition (HFCVD) for low-temperature deposition of a variety of nitride thin films. In this paper the results from our recent work on aluminium, silicon and titanium nitride have been reviewed. In the HFCVD method a hot tungsten filament (1500-1850°C) was utilised to decompose ammonia in order to deposit nitride films at low substrate temperatures and high rates. The substrate temperatures ranged from 245 to 600°C. The film properties were characterised by a number of analytical and optical methods. The effect of various deposition conditions on film properties was studied. All the films obtained were of high chemical purity and had very low or no detectable tungsten contamination from the filament metal.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared spectra of β-Phase BEDT-TTF salts with hexacyanometalate anions (M(CN)3-6; M ≡ CoIII, FeIII, CrIII) (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 7 (1997), S. 67-69 
    Details
    ISSN: 1057-9257
    Keywords: magnetic BEDT-TTF salts ; IR spectra ; Drude-Lorentz model ; charge transfer bands ; C = C stretching vibrations ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Polarised reflectance spectra of three charge transfer salts of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF), β(BEDT-TTF)5M(CN)6 · 10H2O (M ≡ Co, Fe, Cr), are measured in the infrared region 650-6500 cm-1 at room temperature. The reflectance is analysed in terms of the Drude-Lorentz model. Vibrational bands related to C = C stretching are discussed. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of nitrogen addition on optical properties of fluorozirconate glasses (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 5 (1995), S. 265-268 
    Details
    ISSN: 1057-9257
    Keywords: fluorozirconate glass ; linear and non-linear properties ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The linear and non-linear optical properties of fluorozirconate glasses with and without nitrogen, namely ZrF4—BaF2—LaF3—AIF3 and ZrF4—BaF2—LaF3—AIF3—AIN, have been studied. The glass containing nitrogen exhibits a 5 nm shift of the transmittance edge in the UV region towards longer wavelength, whereas there is no change in the IR transmittance. Measurements show a small increase in the linear index of refraction in the visible region and a small decrease in the non-linear (intensity-dependent) refractive index coefficient n2. Longitudinal and transverse sound velocities estimated from Brillouin-scattering experiments for both glasses amount to 6311 and 4514 ms-1, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860050504
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  • 6
    Electronic Resource
    Electronic Resource
    Thin films of novel polysiloxane copolymers substituted with stilbene and biphenylene side-chains: response to nitrogen dioxide (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 317-324 
    Details
    ISSN: 1057-9257
    Keywords: gas sensing ; nitrogen dioxide ; stilbene ; biphenyl ; UV-visible spectroscopy ; thin films ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Thin films of a selection of stilbene and biphenyl side-chain substituted liquid crystal polymers based on polysiloxanes were deposited using an automated dip-coating technique and exposed to either 100 ppm NO2 gas and/or concentrated nitric acid vapour, the consequent effect being monitored by changes in the UV-visible spectra of the material. No effective response to NO2 was observed from the biphenylene analogue, but the stilbene derivatives showed spectral changes to suggest that an interaction occurs between the vapour and the bridge position of the stilbene side-chain. The stilbenes also show a marked pre-conditioning phenomenon upon exposure to nitric acid vapour prior to exposure to nitrogen dioxide. This procedure gives a material that has a more reversible response on exposure to NO2 gas than an anagolous film that has not been pre-treated. Copyright © 1998 John Wiley & Sons, Ltd.
    Additional Material: 6 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopy of excitons in the polar molecular crystal DMABI (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 387-390 
    Details
    ISSN: 1057-9257
    Keywords: molecular crystals ; N,N-dimenthylaminobenzylidene 1,3-indandione ; spectroscopy ; luminescence ; self-trapped excitons ; charge transfer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: This paper considers the origin of the excited states and spectroscopic features of polar molecular compounds of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI). Evidence of a strong exciton-phonon interaction and its effects on the exciton absorption and luminescence spectra was discovered. The spectral features were related to the crystal structure and were ascribed to self-trapped charge transfer excitons. A weak, narrow luminescence line was also observed in resonance with the lowest absorption band and was attributed to free exciton radiative recombination.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Stoichiometric deviations along an ingot of CuGaSe2 (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 147-155 
    Details
    ISSN: 1057-9257
    Keywords: synthesization ; chalcopyrite ; CuGaSE2 single phase ; X-ray diffraction ; stoichiometric deviations ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The dependence of the structural parameters on compositional deviations of CuGaSe2 has been studied. These deviations have been induced along an ingot by a single fusion of the components at 1150 °C and subsequent slow cooling in a stationary ampoule in a vertical furnace. All along the sample a single chalcopyrite phase is present and a compositional gradient along the ingot was found by energy-dispersive analysis of X-rays (EDAX) measurements, the upper part being rich in Ga (series B) and the lower part in Cu (series A), with Cu/Ga ratios of 0·95 and 1·1 respectively. A hypothesis of the existence of two phases in the melt is proposed to explain these facts. The unit cell parameters, anion displacement and Cu and Ga occupation numbers in their sublattices were analysed by X-ray powder diffraction and Rietveld refinement methods. In series A the occupation numbers are near stoichiometry, while in series B a Cu defect appears. In both series, changes in unit cell parameter are related to changes in Cu content, suggesting the presence of a fraction of Cu ions either as interstitials or at Ga sites when Cu is in excess, or of Cu vacancies in its sublattice when there is a Cu deficiency. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen dioxide gas-sensing studies on dip-coated films of novel chromophoric siloxane copolymers employing azo derivatives as side-chains (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 309-316 
    Details
    ISSN: 1057-9257
    Keywords: optical gas sensing ; polysiloxane ; azobenzene ; NO2 ; molecular modelling ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Siloxane copolymers having as side-chains azobenzene derivatives bearing different electron-withdrawing and donating substituents were deposited as thin films by dip coating, and their behaviour upon exposure to 100 pm NO2 was studied by UV/visible spectroscopy. Electron-donating substituents at the ortho positions on the aromatic rings in the azo unit have significant influence on the absorbance changes produced by exposure to NO2, and this is explained by modelling, which suggests that interaction between the electrophilic nitrogen atom in NO2 and the electron clouds of the azobenzene skeleton is responsible for the sensing process, rather than the formation of a Wheland intermediate or other product of chemical reaction. Especially effective substituents are methoxy groups in either aromatic ring ortho or the azo linkage, which also produce a significant increase in intensity of the long-wavelength n-π* transition. This moves the optical interrogation signal to a wavelength range of particular benefit for potential applications. Copyright © 1998 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared studies of the phase transition in TEA(TCNQ)2 (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 353-357 
    Details
    ISSN: 1057-9257
    Keywords: IR ; TEA(TCNQ)2 ; phase transition ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Polarised infrared and optical spectra were measured at temperatures between 5 and 300 K to study the 210 K structural phase transition in the organic charge transfer salt TEA(TCNQ)2. At high temperatures, characteristic spectral features of semiconducting 1:2 TCNQ salts are observed. At low temperatures, several changes are found. First, the electronic charge transfer sharpens and has enhanced oscillator strength in the low-temperature phase. Second, the vibrational lines split into clear doublets, whose appearance is associated with a sharp decrease in the phonon damping at low temperatures.
    Additional Material: 4 Ill.
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