All Outputs (19)

Electronic Structure and Optical Properties of Strained Type-II InAsxSb1-x/InAs Quantum Dots for Mid-Infrared Applications (2023)
Journal Article
Yeap, G. H., Rybchenko, S., Itskevich, I., Haywood, S., Carrington, P., & Krier, A. (2023). Electronic Structure and Optical Properties of Strained Type-II InAsxSb1-x/InAs Quantum Dots for Mid-Infrared Applications. Defect and Diffusion Forum, 425, 3-8. https://doi.org/10.4028/p-72o15p

InSb-based self-assembled quantum dots (SAQDs) are very promising for the mid-infrared (3-5 μm) optical range. We have analysed the electronic structure and optical properties of InAsxSb1- x/InAs dots. In this paper, we present the results of the mod... Read More about Electronic Structure and Optical Properties of Strained Type-II InAsxSb1-x/InAs Quantum Dots for Mid-Infrared Applications.

Esterification of residual palm oil using solid acid catalyst derived from rice husk (2020)
Journal Article
Semilin, V., Balan, W. S., Janaun, J., Chung, C. H., Zhu, Z., Haywood, S. K., Touhami, D., Chong, K. P., Yaser, A. Z., Lee, P. C., & Zein, S. H. (2021). Esterification of residual palm oil using solid acid catalyst derived from rice husk. Journal of hazardous materials, 404(Part B), Article 124092. https://doi.org/10.1016/j.jhazmat.2020.124092

In this study, carbon-silica based acid catalysts derived from rice husks (RH) were successfully synthesised using microwave (MW) technology. The results showed that MW sulphonation produced Sulphur (S) content of 17.2–18.5 times higher than in raw R... Read More about Esterification of residual palm oil using solid acid catalyst derived from rice husk.

Recovery of oil from palm oil mill effluent using polypropylene micro/nanofiber (2020)
Journal Article
Semilin, V., Janaun, J., Chung, C. H., Touhami, D., Haywood, S. K., Chong, K. P., Yaser, A. Z., & Zein, S. H. (2021). Recovery of oil from palm oil mill effluent using polypropylene micro/nanofiber. Journal of hazardous materials, 404, Article 124144. https://doi.org/10.1016/j.jhazmat.2020.124144

Residual palm oil that goes into the river untreated can become detrimental to the environment. Residual oil discharge during milling process into palm oil mill effluent (POME) is unavoidable. About 1 wt% of residual oil in POME causes major problems... Read More about Recovery of oil from palm oil mill effluent using polypropylene micro/nanofiber.

Wheat Straw Bio-refining. Part I: Optimization of the Microwave Radiation Process with Sulphuric Acid Pre-treatment (2017)
Journal Article
Demirhan, H., Fauzi, A., Skoulou, V., Haywood, S., & Zein, S. H. (2017). Wheat Straw Bio-refining. Part I: Optimization of the Microwave Radiation Process with Sulphuric Acid Pre-treatment. Current Microwave Chemistry, 4(3), 205-218. https://doi.org/10.2174/2213335604666170719113659

Background: This study investigates the microwave-assisted acid extraction of lignin from wheat straw.

Methods: Two experimental design methods, the Central Composite Design (CCD) and the Response Surface Method (RSM) methods were used to select c... Read More about Wheat Straw Bio-refining. Part I: Optimization of the Microwave Radiation Process with Sulphuric Acid Pre-treatment.

Characterization of rice husk-based catalyst prepared via conventional and microwave carbonisation (2017)
Journal Article
Touhami, D., Zhu, Z., Balan, W. S., Janaun, J., Haywood, S., & Zein, S. (2017). Characterization of rice husk-based catalyst prepared via conventional and microwave carbonisation. Journal of Environmental Chemical Engineering, 5(3), 2388-2394. https://doi.org/10.1016/j.jece.2017.04.020

© 2017 Elsevier Ltd. Carbon-based sulphonated catalysts (CBSCs) were made from rice husk for biodiesel production. The CBSCs were prepared by microwave (MW) and conventional heating processes from the same feedstock. In both heating systems, the prep... Read More about Characterization of rice husk-based catalyst prepared via conventional and microwave carbonisation.

Composting paper and grass clippings with anaerobically treated palm oil mill effluent (2016)
Journal Article
Zahrim, A. Y., Leong, P. S., Ayisah, S. R., Janaun, J., Chong, K. P., Cooke, F. M., & Haywood, S. (2016). Composting paper and grass clippings with anaerobically treated palm oil mill effluent. International Journal Of Recycling of Organic Waste in Agriculture, 5(3), 221-230. https://doi.org/10.1007/s40093-016-0131-9

Purpose The purpose of this study is to investigate the composting performance of anaerobically treated palm oil mill effluent (AnPOME) mixed with paper and grass clippings. Methods Composting was conducted using a laboratory scale system for 40 days... Read More about Composting paper and grass clippings with anaerobically treated palm oil mill effluent.

Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure (2016)
Journal Article
Haywood, S. K., Rybchenko, S. I., Touhami, D., & Wadhawan, J. D. (2016). Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure. ChemSusChem, 9(13), 1660-1669. https://doi.org/10.1002/cssc.201600267

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The recently proposed highly efficient route of pyridine-catalyzed CO 2 reduction to methanol was explored on platinum electrodes at high CO 2 pressure. At 55 bar (5.5 MPa) of CO 2 , the bulk elec... Read More about Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure.

Empowering the smart grid: Can redox batteries be matched to renewable energy systems for energy storage? (2013)
Journal Article
Halls, J. E., Hawthornthwaite, A., Hepworth, R. J., Roberts, N. A., Wright, K. J., Zhou, Y., Haswell, S. J., Haywood, S. K., Kelly, S. M., Lawrence, N. S., & Wadhawan, J. D. (2013). Empowering the smart grid: Can redox batteries be matched to renewable energy systems for energy storage?. Energy & environmental science, 6(3), 1026-1041. https://doi.org/10.1039/c3ee23708g

The charging of an undivided cerium-zinc redox battery by various current waveforms some of which mimic the output of renewable energy (solar, wind, tidal, biofuel burning) to electricity transducers is considered in this work, where the battery oper... Read More about Empowering the smart grid: Can redox batteries be matched to renewable energy systems for energy storage?.

Modeling and analysis of intraband absorption in quantum-dot-in-well mid-infrared photodetectors (2012)
Journal Article
Hong, B. H., Rybchenko, S. I., Itskevich, I. E., Haywood, S. K., Tan, C. H., Vines, P., & Hugues, M. (2012). Modeling and analysis of intraband absorption in quantum-dot-in-well mid-infrared photodetectors. Journal of applied physics, 111(3), 033713. https://doi.org/10.1063/1.3684603

Intraband absorption in quantum-dot-in-a-well (DWELL) mid-infrared photodetectors is investigated using photocurrent spectroscopy and computationally cost-effective modeling linked to experimental data. The DWELL systems are challenging for modeling... Read More about Modeling and analysis of intraband absorption in quantum-dot-in-well mid-infrared photodetectors.

Modeling of intraband absorption for quantum dot-in-well structures with low computational cost (2010)
Journal Article
Hong, B. H., Rybchenko, S. I., Itskevich, I. E., Haywood, S. K., Tan, C. H., Vines, P., & Hugues, M. (2010). Modeling of intraband absorption for quantum dot-in-well structures with low computational cost. Journal of Physics: Conference Series, 242(1), Article 012013. https://doi.org/10.1088/1742-6596/242/1/012013

Much effort has been committed to development of quantum-dot-based infrared photodetectors owing to their potential for normal-incidence absorption and low dark current.Quantum-dot-in-well structures offer additional advantages, such as better wavele... Read More about Modeling of intraband absorption for quantum dot-in-well structures with low computational cost.

Strained arrays of colloidal nanoparticles: Conductance and magnetoresistance enhancement (2009)
Journal Article
Rybchenko, S. I., Dyab, A. K. F., Haywood, S. K., Itskevich, I. E., & Paunov, V. N. (2009). Strained arrays of colloidal nanoparticles: Conductance and magnetoresistance enhancement. Nanotechnology, 20(42), Article ARTN 425607. https://doi.org/10.1088/0957-4484/20/42/425607

Colloidal nanoparticles are very popular as building blocks of functional arrays for electronic and optical applications. However, there is a problem in achieving electrical conductivity in such nanoarrays due to their molecular shells. These shells,... Read More about Strained arrays of colloidal nanoparticles: Conductance and magnetoresistance enhancement.

Applicability of the kp method to modeling of InAs/GaSb short-period superlattices (2009)
Journal Article
Hong, B. H., Rybchenko, S. I., Itskevich, I. E., Haywood, S. K., Intartaglia, R., Tasco, V., Rainò, G., & De Giorgi, M. (2009). Applicability of the kp method to modeling of InAs/GaSb short-period superlattices. Physical review B: Condensed matter and materials physics, 79(16), 165323-1-165323-4. https://doi.org/10.1103/PhysRevB.79.165323

We investigate the long-standing controversy surrounding modeling of the electronic spectra of InAs/GaSb short-period superlattices (SPSLs). Most commonly, such modeling for semiconductor heterostructures is based on the kp method. However, this meth... Read More about Applicability of the kp method to modeling of InAs/GaSb short-period superlattices.

Type-II InAsxSb1-x/InAs quantum dots for midinfrared applications: Effect of morphology and composition on electronic and optical properties (2009)
Journal Article
Yeap, G. H., Rybchenko, S. I., Itskevich, I. E., & Haywood, S. K. (2009). Type-II InAsxSb1-x/InAs quantum dots for midinfrared applications: Effect of morphology and composition on electronic and optical properties. Physical review B: Condensed matter and materials physics, 79(7), 075305-1-075305-6. https://doi.org/10.1103/physrevb.79.075305

InSb-based self-assembled quantum dots are very promising for the midinfrared (3-5μm) optical range. We have analyzed the effect of geometry and composition on the electronic structure and optical spectra of InAsx Sb1-x /InAs dots. The calculated tra... Read More about Type-II InAsxSb1-x/InAs quantum dots for midinfrared applications: Effect of morphology and composition on electronic and optical properties.

L-band-related interband transition in InSb/GaSb self-assembled quantum dots (2008)
Book Chapter
Rybchenko, S. I., Gupta, R., Itskevich, I. E., & Haywood, S. K. (2008). L-band-related interband transition in InSb/GaSb self-assembled quantum dots. In Springer Proceedings in Physics; Narrow Gap Semiconductors 2007 (81-83). Springer Verlag. https://doi.org/10.1007/978-1-4020-8425-6_20

Effect of lattice-mismatch-induced strain on Γ-, X- and L-conduction-band edges in III-V self-assembled quantum dots has been calculated. The misfit strain is shown to strongly affect the band edges, leading to a possibility of Γ-L and Γ-X crossover.... Read More about L-band-related interband transition in InSb/GaSb self-assembled quantum dots.

Room temperature photoluminescence at 4.5 μm from InAsN (2008)
Journal Article
Zhuang, Q., Godenir, A. M. R., Krier, A., Lai, K. T., & Haywood, S. K. (2008). Room temperature photoluminescence at 4.5 μm from InAsN. Journal of applied physics, 103(6), 063520. https://doi.org/10.1063/1.2896638

Nitrogen incorporation in InAsN epilayers grown by radio-frequency plasma-assisted molecular beam epitaxy was investigated as a function of growth conditions. Reduced growth rate, growth temperature, and arsenic flux significantly enhance the nitroge... Read More about Room temperature photoluminescence at 4.5 μm from InAsN.

Conduction-band crossover induced by misfit strain in InSb/GaSb self-assembled quantum dots (2007)
Journal Article
Rybchenko, S. I., Gupta, R., Lai, K. T., Itskevich, I. E., Haywood, S. K., Tasco, V., Deguffroy, N., Baranov, A. N., & Tournié, E. (2007). Conduction-band crossover induced by misfit strain in InSb/GaSb self-assembled quantum dots. Physical review B: Condensed matter and materials physics, 76(19), 0 - 0. https://doi.org/10.1103/physrevb.76.193309

We address the occurrence of conduction-band crossover in III-V self-assembled quantum dots solely due to misfit strain. Band structure analysis in terms of standard deformation-potential theory shows that Γ-X crossover can occur in the dot, while bo... Read More about Conduction-band crossover induced by misfit strain in InSb/GaSb self-assembled quantum dots.

Midinfrared photoluminescence and compositional modulation in pentanary GaInAsPSb alloys grown by liquid phase epitaxy (2007)
Journal Article
Krier, A., Smirnov, V. M., Batty, P. J., Yin, M., Lai, K. T., Rybchenko, S., Haywood, S. K., Vasil'ev, V. I., Gagis, G. S., & Kuchinskii, V. I. (2007). Midinfrared photoluminescence and compositional modulation in pentanary GaInAsPSb alloys grown by liquid phase epitaxy. Applied physics letters, 91(8), 082102. https://doi.org/10.1063/1.2768892

Room temperature photoluminescence is reported from GaInAsSbP pentanary alloys grown by liquid phase epitaxy on GaSb. The epitaxial layers exhibited emission in the midinfrared between 3 and 4 μm. Investigation of the structural and photoluminescence... Read More about Midinfrared photoluminescence and compositional modulation in pentanary GaInAsPSb alloys grown by liquid phase epitaxy.

Importance of aspect ratio over shape in determining the quantization potential of self-assembled zinc-blende III-V quantum dots (2007)
Journal Article
Rybchenko, S. I., Yeap, G., Gupta, R., Itskevich, I. E., & Haywood, S. K. (2007). Importance of aspect ratio over shape in determining the quantization potential of self-assembled zinc-blende III-V quantum dots. Journal of applied physics, 102(1), 013706. https://doi.org/10.1063/1.2752127

We have studied the effect of shape on the strain-modified electron/hole confinement potential in zinc-blende quantum dots (QDs), using standard deformation potential theory and an anisotropic continuum-elasticity approximation. Calculations were per... Read More about Importance of aspect ratio over shape in determining the quantization potential of self-assembled zinc-blende III-V quantum dots.

Electric field induced blueshift of the e1-hh1 exciton transition in a GaAs1-xNx/GaAs (x<1%) stepped quantum well (2006)
Journal Article
Hill, G., Hopkinson, M., Steer, M. J., Gupta, R., Lim, A. C., & Haywood, S. K. (2006). Electric field induced blueshift of the e1-hh1 exciton transition in a GaAs1-xNx/GaAs (x

The authors present room temperature photoluminescence and photocurrent measurements on a three layer GaAsNGaAs Al0.35 Ga0.65 As (N≤1%) stepped quantum well. A blueshift in the ground state transition energy is observed with the application of an ele... Read More about Electric field induced blueshift of the e1-hh1 exciton transition in a GaAs1-xNx/GaAs (x<1%) stepped quantum well.