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Papers by Manthila Rajapakse
Bulletin of the American Physical Society, 2019
The Journal of Physical Chemistry C
Physical Review Materials
A comprehensive first-principles calculation has been carried out revealing that at sufficiently ... more A comprehensive first-principles calculation has been carried out revealing that at sufficiently high Li concentration and certain well-defined configurations a phase transition from black to blue phosphorene can take place. Blue phosphorene, a newly predicted allotrope of phosphorus, possesses unique crystalline and electronic structure and is a promising candidate, not only for fundamental research but also for electronic and optoelectronic applications. Methods of growing high-quality blue phosphorene layers are highly desirable but challenging. Here, a kinetic pathway to grow blue phosphorene layers from black phosphorene layers via Li intercalation is proposed based on first-principles study. This study pointed out that Li atoms intercalated in black phosphorene could act as a "catalyst" in the "reactive region" of the lone pair of P atoms, leading to a P-P bond breaking and, subsequently, a local structural transformation from an orthorhombic lattice to an assembly of parallel narrow nanoribbons with rhombohedra-like symmetry. During Li deintercalation, these nanoribbons are self-mended and form blue phosphorene layers. The interlayer distance was found to be 4.60 Å for a double layer with AA stacking and 4.13 Å for a multilayer with ABC stacking, indicating monolayer blue phosphorene can be mechanically exfoliated. This study also points out the possibility of new phases in other systems, where intercalation can lead to an unexpected structural phase transition and even a discovery of novel materials.
npj 2D Materials and Applications
Recent advances in two-dimensional (2D) materials have led to the renewed interest in intercalati... more Recent advances in two-dimensional (2D) materials have led to the renewed interest in intercalation as a powerful fabrication and processing tool. Intercalation is an effective method of modifying the interlayer interactions, doping 2D materials, modifying their electronic structure or even converting them into starkly different new structures or phases. Herein, we discuss different methods of intercalation and provide a comprehensive review of various roles and applications of intercalation in next‐generation energy storage, optoelectronics, thermoelectrics, catalysis, etc. The recent progress in intercalation effects on crystal structure and structural phase transitions, including the emergence of quantum phases are also reviewed.
Physical Chemistry Chemical Physics
Phosphorene-based field effect transistors are fabricated and are shown to be highly sensitive ga... more Phosphorene-based field effect transistors are fabricated and are shown to be highly sensitive gas and photodetectors. The sensing mechanism is explained using a Schottky barrier model at the phosphorene/metal contact interface.
Physical Chemistry Chemical Physics
In this study, bilayer phosphorene samples were subjected to high pressure using a Diamond Anvil ... more In this study, bilayer phosphorene samples were subjected to high pressure using a Diamond Anvil Cell (DAC) and their vibrational properties were studied via in situ Raman spectroscopy. Systematic shifting...
Applied Physics Letters, 2009
Layered cobalt oxides have attracted great attention as a promising candidate for thermoelectric ... more Layered cobalt oxides have attracted great attention as a promising candidate for thermoelectric applications since the discovery of large Seebeck coefficient and relatively low resistivity in . Among various layered cobalt oxides, shows a high thermoelectric figure of merit of at ...
Bulletin of the American Physical Society, 2019
The Journal of Physical Chemistry C
Physical Review Materials
A comprehensive first-principles calculation has been carried out revealing that at sufficiently ... more A comprehensive first-principles calculation has been carried out revealing that at sufficiently high Li concentration and certain well-defined configurations a phase transition from black to blue phosphorene can take place. Blue phosphorene, a newly predicted allotrope of phosphorus, possesses unique crystalline and electronic structure and is a promising candidate, not only for fundamental research but also for electronic and optoelectronic applications. Methods of growing high-quality blue phosphorene layers are highly desirable but challenging. Here, a kinetic pathway to grow blue phosphorene layers from black phosphorene layers via Li intercalation is proposed based on first-principles study. This study pointed out that Li atoms intercalated in black phosphorene could act as a "catalyst" in the "reactive region" of the lone pair of P atoms, leading to a P-P bond breaking and, subsequently, a local structural transformation from an orthorhombic lattice to an assembly of parallel narrow nanoribbons with rhombohedra-like symmetry. During Li deintercalation, these nanoribbons are self-mended and form blue phosphorene layers. The interlayer distance was found to be 4.60 Å for a double layer with AA stacking and 4.13 Å for a multilayer with ABC stacking, indicating monolayer blue phosphorene can be mechanically exfoliated. This study also points out the possibility of new phases in other systems, where intercalation can lead to an unexpected structural phase transition and even a discovery of novel materials.
npj 2D Materials and Applications
Recent advances in two-dimensional (2D) materials have led to the renewed interest in intercalati... more Recent advances in two-dimensional (2D) materials have led to the renewed interest in intercalation as a powerful fabrication and processing tool. Intercalation is an effective method of modifying the interlayer interactions, doping 2D materials, modifying their electronic structure or even converting them into starkly different new structures or phases. Herein, we discuss different methods of intercalation and provide a comprehensive review of various roles and applications of intercalation in next‐generation energy storage, optoelectronics, thermoelectrics, catalysis, etc. The recent progress in intercalation effects on crystal structure and structural phase transitions, including the emergence of quantum phases are also reviewed.
Physical Chemistry Chemical Physics
Phosphorene-based field effect transistors are fabricated and are shown to be highly sensitive ga... more Phosphorene-based field effect transistors are fabricated and are shown to be highly sensitive gas and photodetectors. The sensing mechanism is explained using a Schottky barrier model at the phosphorene/metal contact interface.
Physical Chemistry Chemical Physics
In this study, bilayer phosphorene samples were subjected to high pressure using a Diamond Anvil ... more In this study, bilayer phosphorene samples were subjected to high pressure using a Diamond Anvil Cell (DAC) and their vibrational properties were studied via in situ Raman spectroscopy. Systematic shifting...
Applied Physics Letters, 2009
Layered cobalt oxides have attracted great attention as a promising candidate for thermoelectric ... more Layered cobalt oxides have attracted great attention as a promising candidate for thermoelectric applications since the discovery of large Seebeck coefficient and relatively low resistivity in . Among various layered cobalt oxides, shows a high thermoelectric figure of merit of at ...