7 research outputs found
Media 1: Two-step fabrication of R-PbI<sub>4(1-y)</sub>Br<sub>4y</sub> type light emitting inorganic-organic hybrid photonic structures
Originally published in Optical Materials Express on 01 January 2014 (ome-4-1-101
PCBM Functionalized WS<sub>2</sub> Hybrid Nanostructures for High Performance Li-Ion Battery Anodes: Toward Binder-Free Electrodes
To mitigate technical challenges associated with tungsten
disulfide
(WS2) anodes for lithium-ion batteries (LIBs) application,
we demonstrate a novel approach of using phenyl-C61-butyric
acid methyl ester (PCBM) to effectively functionalize WS2 nanoflakes and multiwalled carbon nanotubes (MWCNTs), which results
in formation of WS2 hybrid nanostructures. Functionalization
is confirmed by various optical and structural studies. PCBM worked
as a conducting bridge between WS2 hexagonal nanoflakes
and MWCNTs and thus reduced the junction resistance significantly,
as well as reduced the agglomeration and pulverization of WS2 nanoflakes, which in turn improved the performance of WS2 anodes. The demonstrated WS2–PCBM/MWCNT hybrid
nanostructure-based anode delivered an excellent average discharge
specific capacity of ∼687.14 mAh g–1 at current
density of 0.5 A g–1 for 50 cycles with initial
Coulombic efficiency of ∼81% and significant rate performance.
The WS2 hybrid anodes were cycled for 500 cycles at a current
density of 1.0 A g–1 with a stable average discharge
specific capacity of ∼485.73 mAh g–1. In
addition, the PVDF binder-free WS2–PCBM/MWCNT hybrid
anode has displayed an average discharge specific capacity of ∼1224
mAh g–1 for up to 20 cycles at a current density
of 0.1 A g–1. Our work provides a novel approach
by exploiting the utility of PCBM in LIBs
Blue-Green Color Tunable Solution Processable Organolead Chloride–Bromide Mixed Halide Perovskites for Optoelectronic Applications
Solution-processed organo-lead halide
perovskites are produced with sharp, color-pure electroluminescence
that can be tuned from blue to green region of visible spectrum (425–570
nm). This was accomplished by controlling the halide composition of
CH<sub>3</sub>NH<sub>3</sub>PbÂ(Br<sub><i>x</i></sub>Cl<sub>1–<i>x</i></sub>)<sub>3</sub> [0 ≤ <i>x</i> ≤ 1] perovskites. The bandgap and lattice parameters
change monotonically with composition. The films possess remarkably
sharp band edges and a clean bandgap, with a single optically active
phase. These chloride–bromide perovskites can potentially be
used in optoelectronic devices like solar cells and light emitting
diodes (LEDs). Here we demonstrate high color-purity, tunable LEDs
with narrow emission full width at half maxima (FWHM) and low turn
on voltages using thin-films of these perovskite materials, including
a blue CH<sub>3</sub>NH<sub>3</sub>PbCl<sub>3</sub> perovskite LED
with a narrow emission FWHM of 5 nm
Opal-like Multicolor Appearance of Self-Assembled Photonic Array
Molecular self-assembly
of short peptide building blocks leads to the formation of various
material architectures that may possess unique physical properties.
Recent studies had confirmed the key role of biaromaticity in peptide
self-assembly, with the diphenylalanine (FF) structural family as
an archetypal model. Another significant direction in the molecular
engineering of peptide building blocks is the use of fluorenylmethoxycarbonyl
(Fmoc) modification, which promotes the assembly process and may result
in nanostructures with distinctive features and macroscopic hydrogel
with supramolecular features and nanoscale order. Here, we explored
the self-assembly of the protected, noncoded fluorenylmethoxycarbonyl-β,β-diphenyl-Ala-OH
(Fmoc-Dip) amino acid. This process results in the formation of elongated
needle-like crystals with notable aromatic continuity. By altering
the assembly conditions, arrays of spherical particles were formed
that exhibit strong light scattering. These arrays display vivid coloration,
strongly resembling the appearance of opal gemstones. However, unlike
the Rayleigh scattering effect produced by the arrangement of opal,
the described optical phenomenon is attributed to Mie scattering.
Moreover, by controlling the solution evaporation rate, i.e., the
assembly kinetics, we were able to manipulate the resulting coloration.
This work demonstrates a bottom-up approach, utilizing self-assembly
of a protected amino acid minimal building block, to create arrays
of organic, light-scattering colorful surfaces
Opal-like Multicolor Appearance of Self-Assembled Photonic Array
Molecular self-assembly
of short peptide building blocks leads to the formation of various
material architectures that may possess unique physical properties.
Recent studies had confirmed the key role of biaromaticity in peptide
self-assembly, with the diphenylalanine (FF) structural family as
an archetypal model. Another significant direction in the molecular
engineering of peptide building blocks is the use of fluorenylmethoxycarbonyl
(Fmoc) modification, which promotes the assembly process and may result
in nanostructures with distinctive features and macroscopic hydrogel
with supramolecular features and nanoscale order. Here, we explored
the self-assembly of the protected, noncoded fluorenylmethoxycarbonyl-β,β-diphenyl-Ala-OH
(Fmoc-Dip) amino acid. This process results in the formation of elongated
needle-like crystals with notable aromatic continuity. By altering
the assembly conditions, arrays of spherical particles were formed
that exhibit strong light scattering. These arrays display vivid coloration,
strongly resembling the appearance of opal gemstones. However, unlike
the Rayleigh scattering effect produced by the arrangement of opal,
the described optical phenomenon is attributed to Mie scattering.
Moreover, by controlling the solution evaporation rate, i.e., the
assembly kinetics, we were able to manipulate the resulting coloration.
This work demonstrates a bottom-up approach, utilizing self-assembly
of a protected amino acid minimal building block, to create arrays
of organic, light-scattering colorful surfaces
Opal-like Multicolor Appearance of Self-Assembled Photonic Array
Molecular self-assembly
of short peptide building blocks leads to the formation of various
material architectures that may possess unique physical properties.
Recent studies had confirmed the key role of biaromaticity in peptide
self-assembly, with the diphenylalanine (FF) structural family as
an archetypal model. Another significant direction in the molecular
engineering of peptide building blocks is the use of fluorenylmethoxycarbonyl
(Fmoc) modification, which promotes the assembly process and may result
in nanostructures with distinctive features and macroscopic hydrogel
with supramolecular features and nanoscale order. Here, we explored
the self-assembly of the protected, noncoded fluorenylmethoxycarbonyl-β,β-diphenyl-Ala-OH
(Fmoc-Dip) amino acid. This process results in the formation of elongated
needle-like crystals with notable aromatic continuity. By altering
the assembly conditions, arrays of spherical particles were formed
that exhibit strong light scattering. These arrays display vivid coloration,
strongly resembling the appearance of opal gemstones. However, unlike
the Rayleigh scattering effect produced by the arrangement of opal,
the described optical phenomenon is attributed to Mie scattering.
Moreover, by controlling the solution evaporation rate, i.e., the
assembly kinetics, we were able to manipulate the resulting coloration.
This work demonstrates a bottom-up approach, utilizing self-assembly
of a protected amino acid minimal building block, to create arrays
of organic, light-scattering colorful surfaces
Opal-like Multicolor Appearance of Self-Assembled Photonic Array
Molecular self-assembly
of short peptide building blocks leads to the formation of various
material architectures that may possess unique physical properties.
Recent studies had confirmed the key role of biaromaticity in peptide
self-assembly, with the diphenylalanine (FF) structural family as
an archetypal model. Another significant direction in the molecular
engineering of peptide building blocks is the use of fluorenylmethoxycarbonyl
(Fmoc) modification, which promotes the assembly process and may result
in nanostructures with distinctive features and macroscopic hydrogel
with supramolecular features and nanoscale order. Here, we explored
the self-assembly of the protected, noncoded fluorenylmethoxycarbonyl-β,β-diphenyl-Ala-OH
(Fmoc-Dip) amino acid. This process results in the formation of elongated
needle-like crystals with notable aromatic continuity. By altering
the assembly conditions, arrays of spherical particles were formed
that exhibit strong light scattering. These arrays display vivid coloration,
strongly resembling the appearance of opal gemstones. However, unlike
the Rayleigh scattering effect produced by the arrangement of opal,
the described optical phenomenon is attributed to Mie scattering.
Moreover, by controlling the solution evaporation rate, i.e., the
assembly kinetics, we were able to manipulate the resulting coloration.
This work demonstrates a bottom-up approach, utilizing self-assembly
of a protected amino acid minimal building block, to create arrays
of organic, light-scattering colorful surfaces