Browsing by Author "BLAU, WERNER"
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A2B2-type push-pull porphyrins as reverse saturable and saturable absorbers
SENGE, MATHIAS; BLAU, WERNER (2007)A2B2-type push?pull porphyrins with a strong intramolecular dipole moment have been prepared via Heck and Suzuki coupling reactions as novel materials for use in nonlinear optics (NLO); they display saturable (SA) and ... -
Activation behaviour and dielectric relaxation in polyvinyl alcohol and multiwall carbon nanotube composite films
BLAU, WERNER; PADAMATI, RAMESH (2011)The dc and ac electrical transport property of Polyvinyl Alcohol-Multiwall Carbon Nanotubes (PVA-MWNT) composites has been investigated within a temperature range 77?T?300K and in the frequency range 20Hz to 1MHz. The ... -
Alkynyl substituted phthalocyanine derivatives as targets for optical limiting
BLAU, WERNER (2003)One of the key issues in the development of efficient optical limiters is the search for appropriate materials with improved nonlinear absorption. Phthalocyanine materials are among the most promising nonlinear absorbers ... -
Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films
BLAU, WERNER; COLEMAN, JONATHAN NESBIT; DRURY, ANNA (Journal of Applied Physics, 2004)Control of interchain separation enables the optical properties of polymer thin films to be altered. We present a thin film preparation technique that increases the free volume fraction in spin coated polymer thin films ... -
Alternating and direct current characterization and photoinduced absorption studies of modified conjugated polymer thin films
BLAU, WERNER; COLEMAN, JONATHAN; DRURY, ANNA (2004)Control of interchain separation enables the optical properties of polymer thin films to be altered. We present a thin film preparation technique that increases the free volume fraction in spin coated polymer thin films ... -
Amplified spontaneous emission and optical gain spectra from stilbenoid and phenylene vinylene derivative model compounds
BLAU, WERNER (1999)We report single-pass optical gain measurement in polystyrene! waveguides doped with stilbenoid and phenylene vinylene derivative model compounds under picosecond excitation. Using a wavelength dependent model of amplified ... -
Anomalous electrical transport properties of polyvinyl alcohol-multiwall carbon nanotubes composites below room temperature
BLAU, WERNER; PADAMATI, RAMESH (2011)Anomalous electrical transport properties of polyvinyl alcohol-multiwall carbon nanotubes composites below room temperature G. Chakraborty, 1 K. Gupta, 1 A. K. Meikap, 1, a R. Babu, 2 and W. J. Blau 2 1 Department ... -
Base-specific photocleavage of DNA induced by nanosecond U.V. pulsed laser radiation or methylene blue sensitisation
MC CONNELL, DAVID JOHN; BLAU, WERNER; KELLY, JOHN MOFFAT (1987)Excitation of DNA in neutral solution either with short-duration, intense pulses of excimer laser (248 nm) radiation or with low intensity red-ligh (633 nm) sensitisation by methylene blue causes cleavage of the DNA backbone ... -
Blue amplified spontaneous emission from a stilbenoid-compound-doped polymer optical fiber
BLAU, WERNER (2001)We report on the fabrication and characteristics of a step-index glass-clad polymer optical fiber that uses a novel fluorescent stilbenoid compound for lasing and amplification applications. The compound, 1,4-bis(4-diph ... -
Blue-green small-signal gain and saturation in a luminescent polymer gain medium
BLAU, WERNER (2006)The authors study the optical gain and saturation behavior in a blue-green-emitting luminescent polymer gain medium. Based on the results of amplified spontaneous emission measurements, the gain coefficients, the gain-length ... -
Broadband ultrafast nonlinear absorption and nonlinear refraction of layered molybdenum dichalcogenide semiconductors
BLAU, WERNER; COLEMAN, JONATHAN; BLAU, WERNER; COLEMAN, JONATHAN NESBIT (2014)A series of layered molybdenum dichalcogenides, i.e. ,MoX 2 (X ¼ S, Se and Te), were prepared in cyclohexyl pyrrolidinone by a liquid-phase exfoliation technique. The high quality of the two-dimensional nanostructures ... -
Carbazole-linked porphyrin dimers for organic light emitting diodes: Synthesis and initial photophysical studies
SENGE, MATHIAS; RYAN, AOIFE; TUFFY, BRIAN; BLAU, WERNER (2011)Carbazole linked porphyrin dimers were synthesized in good yields via stepwise Suzuki coupling reactions using bromoporphyrins and borylated carbazoles as the precursors, the latter of which were synthesized via known ... -
Carbon nanotubes and nanotube composites for nonlinear optical devices
BLAU, WERNER; WANG, JUN (2009)Carbon nanotubes possess not only outstanding mechanical, electrical and thermal properties but also unique nonlinear optical properties. In this Feature Article, we review the recent developments of the carbon nanotube ... -
Charge transport effects in field emission from carbon nanotube-polymer composites
BLAU, WERNER; COLEMAN, JONATHAN NESBIT (Elsevier, 2005)Electron field emission measurements have been made on multiwall arc discharge carbon nanotubes embedded in a conjugated polymer host. Electron emission at low nanotube content is observed and attributed to an enhancement ... -
Controllable broadband nonlinear optical response of graphene dispersions by tuning vacuum pressure.
BLAU, WERNER (2013)Nonlinear scattering, originating from laser induced solvent micro-bubbles and/or micro-plasmas, is regarded as the principal mechanism for nonlinear optical (NLO) response of graphene dispersions at ns timescale. In this ... -
Correlation studies on structurally diverse porphyrin monomers, dimers and trimers and their nonlinear optical responses
SENGE, MATHIAS; WANG, JUN; BLAU, WERNER (2009)An investigation of the nonlinear absorption of a wide range of structurally diverse porphyrin monomers, bisporphyrins and trisporphyrins, using open Z-scan technique with 6 ns pulsed laser operating at 532 nm was carried ... -
Dispersion and purification of Mo6S3I6 nanowires in organic solvents
COLEMAN, JONATHAN NESBIT; BLAU, WERNER (American Institute of Physics, 2007)Sedimentation measurements have been performed on dispersions of Mo6S3I6 nanowires in a range of common solvents. By far the best solvents were N,N-dimethylformamide DMF and acetone. Stable dispersions of purified ... -
Distributed feedback laser action from polymeric waveguides doped with oligo phenylene vinylene model compounds
BLAU, WERNER (2000)We report lasing studies of poly~styrene ! waveguides doped with amino- and cyano-substituted oligo phenylene vinylene ~ distyryl benzene ! model compounds under picosecond excitation. Optical feedback is provided ... -
Effect of solvent and dispersant on the bundle dissociation of single-walled carbon nanotube
COLEMAN, JONATHAN; BLAU, WERNER; GIORDANI, SILVIA; DRURY, ANNA (2005)Single-wall carbon nanotubes (SWCNT) are severely restricted in their applications, as they exist in rope-like bundles. Recently, J. Coleman et al. demonstrated a spectroscopic method to monitor bundle dissociation in low ... -
The effect of solvent choice on the mechanical properties of carbon nanotube-polymer composites
COLEMAN, JONATHAN; BLAU, WERNER (2007)Dispersions of single walled nanotubes in N-methyl-2-pyrrolidone have been exposed to water and variations in storage temperature. The subsequent degradation of dispersion quality has been monitored using sedimentation, ...