The Experts below are selected from a list of 239448 Experts worldwide ranked by ideXlab platform
Xiao Cheng Zeng - One of the best experts on this subject based on the ideXlab platform.
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cap3 a new two dimensional Functional Material with desirable band gap and ultrahigh carrier mobility
Journal of Physical Chemistry Letters, 2018Co-Authors: Zhiwen Zhuo, Hongyan Guo, Xiao Cheng ZengAbstract:Two-dimensional (2D) semiconductors with direct and modest band gap and ultrahigh carrier mobility are highly desired Functional Materials for nanoelectronic applications. Herein, we predict that monolayer CaP3 is a new 2D Functional Material that possesses not only a direct band gap of 1.15 eV (based on HSE06 computation) but also a very high electron mobility up to 19 930 cm2 V–1 s–1, comparable to that of monolayer phosphorene. More remarkably, contrary to bilayer phosphorene which possesses dramatically reduced carrier mobility compared to its monolayer counterpart, CaP3 bilayer possesses even higher electron mobility (22 380 cm2 V–1 s–1) than its monolayer counterpart. The band gap of 2D CaP3 can be tuned over a wide range from 1.15 to 0.37 eV (HSE06 values) through controlling the number of stacked CaP3 layers. Besides novel electronic properties, 2D CaP3 also exhibits optical absorption over the entire visible-light range. The combined novel electronic, charge mobility, and optical properties rende...
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a new two dimensional Functional Material with desirable bandgap and ultrahigh carrier mobility
arXiv: Materials Science, 2018Co-Authors: Zhiwen Zhuo, Hongyan Guo, Xiao Cheng ZengAbstract:Two-dimensional (2D) semiconductors with direct and modest bandgap and ultrahigh carrier mobility are highly desired Functional Materials for nanoelectronic applications. Herein, we predict that monolayer CaP3 is a new 2D Functional Material that possesses not only a direct bandgap of 1.15 eV (based on HSE06 computation), and also a very high electron mobility up to 19930 cm2 V-1 s-1, comparable to that of monolayer phosphorene. More remarkably, contrary to the bilayer phosphorene which possesses dramatically reduced carrier mobility compared to its monolayer counterpart, CaP3 bilayer possesses even higher electron mobility (22380 cm2 V-1 s-1) than its monolayer counterpart. The bandgap of 2D CaP3 can be tuned over a wide range from 1.15 to 0.37 eV (HSE06 values) through controlling the number of stacked CaP3 layers. Besides novel electronic properties, 2D CaP3 also exhibits optical absorption over the entire visible-light range. The combined novel electronic, charge mobility, and optical properties render 2D CaP3 an exciting Functional Material for future nanoelectronic and optoelectronic applications.
William H C Martin - One of the best experts on this subject based on the ideXlab platform.
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highly branched poly n isopropyl acrylamide Functionalized with an inducer molecule suppresses quorum sensing in chromobacterium violaceum
Chemical Communications, 2019Co-Authors: Joanna Shepherd, Thomas Swift, Chienyi Chang, James R Boyne, Stephen Rimmer, William H C MartinAbstract:Bacterial quorum sensing has been implicated in a number of pathogenic bacterial processes, such as biofilm formation, making it a crucial target for developing Materials with a novel antibiotic mode of action. This paper describes poly(N-isopropyl acrylamide) that has been covalently linked, at multiple chain ends, to homoserine lactone to give a highly branched polymer Functionalized with a key messenger molecule implicated in QS. This novel Functional Material has shown promising anti-QS activity in a Chromobacterium violaceum assay.
Joanna Shepherd - One of the best experts on this subject based on the ideXlab platform.
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highly branched poly n isopropyl acrylamide Functionalized with an inducer molecule suppresses quorum sensing in chromobacterium violaceum
Chemical Communications, 2019Co-Authors: Joanna Shepherd, Thomas Swift, Chienyi Chang, James R Boyne, Stephen Rimmer, William H C MartinAbstract:Bacterial quorum sensing has been implicated in a number of pathogenic bacterial processes, such as biofilm formation, making it a crucial target for developing Materials with a novel antibiotic mode of action. This paper describes poly(N-isopropyl acrylamide) that has been covalently linked, at multiple chain ends, to homoserine lactone to give a highly branched polymer Functionalized with a key messenger molecule implicated in QS. This novel Functional Material has shown promising anti-QS activity in a Chromobacterium violaceum assay.
Ralph P Tatam - One of the best experts on this subject based on the ideXlab platform.
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optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water
Materials Chemistry and Physics, 2012Co-Authors: Sergiy Korposh, Roman Selyanchyn, Wataru Yasukochi, Stephen W. James, Ralph P TatamAbstract:Abstract A fibre optic long period grating (LPG) with an nano-assembled mesoporous coating of alternate layers of poly(diallyldimethylammonium chloride) (PDDA) and SiO 2 nanospheres was used for the development of a highly sensitive fibre-optic chemical sensor. Sensor fabrication involves a 2-stage process: firstly, the deposition of the base mesoporous thin film (PDDA/SiO 2 ) over an LPG written in the optical fibre using a layer-by layer technique, followed by the infusion of a Functional Material into the porous film. The refractive index of the base mesoporous coating, determined at a wavelength of 633 nm using ellipsometry, was found to be 1.2. The infusion of the Functional Material into the coating resulted in a significant change in the RI of the coating, producing a dramatic change in the transmission spectrum of the LPG. The sensing mechanism exploited is based upon chemically induced desorption of the Functional Material from the mesoporous coating. The sensing of ammonia in aqueous solution was chosen as an example to demonstrate the sensing principle of the LPG sensor. The operation of the sensor was characterized using two Functional Materials, tetrakis-(4-sulfophenyl)porphine (TSPP) and polyacrylic acid (PAA). The device showed high sensitivity to ammonia with a response time less than 100 s and a limit of detection of 140 ppb when the TSPP infused (PDDA/SiO 2 ) film was employed as a sensitive element.
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ammonia sensing using a fibre optic long period grating with a porous nanostructured coating formed from silica nanospheres
Proceedings of SPIE the International Society for Optical Engineering, 2010Co-Authors: Sergiy Korposh, Stephen W. James, Stephen M. Topliss, William J Batty, S Kodaira, Seungwoo Lee, Ralph P TatamAbstract:The transmission spectrum of a fibre optic long period grating (LPG) coated with a porous multilayer coating of thickness of order 400 nm formed from silica nanospheres is shown to exhibit a strong sensitivity to the infusion of a Functional, chemically sensitive Material into the coating. Subsequently, the transmission spectrum of the LPG shows sensitivity to changes in the properties of the Functional Material when exposed to a particular chemical species in an aqueous solution. The operation of such a device as an ammonia sensor is demonstrated, exhibiting 1 ppm sensitivity. The sensing mechanisms are discussed.
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optical fibre long period grating based selective vapour sensing of volatile organic compounds
Sensors and Actuators B-chemical, 2010Co-Authors: Stephen M. Topliss, Stephen W. James, Frank Davis, Seamus P J Higson, Ralph P TatamAbstract:Abstract The chemical sensing capabilities of an optical fibre long period grating (LPG) coated with a Functional Material are explored. The LPG period and coating thickness are chosen such that the mode transition region, characteristic of LPGs coated with nanostructured coatings, corresponds with the phase matching turning point, ensuring optimum sensitivity. The Functional Material is a calixarene, which is shown to exhibit sensitivity to the aromatic compounds toluene and benzene, while being relatively insensitive to the aliphatic hydrocarbon hexane. A nanoscale cavity in the calixarene molecule entraps the VOC molecule, thereby altering the refractive index of the coating and influencing the transmission spectrum of the LPG. A sensitivity to toluene of 231 ppmv has been achieved, based on a spectrometer resolution of 0.3 nm. This is a weak molecular interaction thereby ensuring the sensor gives a reversible response when the VOC is removed. The recovery time is of the order of 15 s.
Yong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Functional properties and promising applications of high entropy alloys
Scripta Materialia, 2020Co-Authors: Xuehui Yan, Yong ZhangAbstract:Abstract High-entropy alloys are a novel class of complex Materials discovered near the center of phase diagram, and show exceptional performances over the traditional alloys. The ability of high-entropy alloys to be designed unique combinations of mechanical and Functional properties in unlimited space of alloy compositions is encouraging. The unconventional chemical structures hold promise for achieving unprecedented Functional performances, making it a potential Functional Material in the field of soft-magnetic, anti-radiation, catalyst, photothermal conversion Materials, etc. Here, the recent progress in understanding the salient features of high-entropy alloys is reviewed. The Functional performances and underlying mechanisms are carefully discussed.
