scholarly journals Melanin-based structural coloration of birds and its biomimetic applications

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Deok-Jin Jeon ◽  
Suejeong Paik ◽  
Seungmuk Ji ◽  
Jong-Souk Yeo
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Recent Progress ◽  
Current Understanding ◽  
Structural And Optical Properties ◽  
Structural Coloration ◽  
Nanoscale Structures ◽  
Structural Colors ◽  
Self Assembling

AbstractMelanin has been a widely researched pigment by scientists for decades as it is undoubtedly the most ubiquitous and ancient pigment found in nature. Melanin plays very significant roles in structural plumage colors in birds: it has visible light-absorbing capabilities, and nanoscale structures can be formed by self-assembling melanin granules. Herein, we review recent progress on melanin-based structural coloration research. We hope that this review will provide current understanding of melanin’s structural and optical properties, natural coloration mechanisms, and biomimetic methods to implement artificial melanin-based structural colors.

Correlation between structural and optical properties of Si nanocrystals embedded in SiO2: The mechanism of visible light emission

2000 ◽  
Vol 77 (20) ◽  
pp. 3143-3145 ◽  
Author(s):  
B. Garrido ◽  
M. López ◽  
O. González ◽  
A. Pérez-Rodrı́guez ◽  
J. R. Morante ◽  
...  
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Light Emission ◽  
Structural And Optical Properties ◽  
Si Nanocrystals ◽  
Visible Light Emission

scholarly journals Structural and optical properties of TiO2 nanoparticles and their photocatalytic behavior under visible light

2021 ◽  
Vol 23 (2) ◽  
pp. e21310965
Author(s):  
Edgar Eduardo Mosquera ◽  
Daniela Herrera-Molina ◽  
Jesús Diosa
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Average Particle Size ◽  
Bandgap Energy ◽  
Average Particle ◽  
Thermal Treatments ◽  
Structural And Optical Properties

TiO2 nanoparticles were successfully synthesized using a facile and scalable sol-gel method and their structural and optical properties studied. XRD ad FTIR was used to identify the phase, crystallite size, and functional groups present in the nanoparticles. The prepared samples crystallize in the anatase structure with highly crystalline order. TEM/EDX shows that the nanoparticles are pure, spherical, and with an average particle size of 15 ± 2 nm. The bandgap energy was 3.59, 3.79, and 3.64 eV, respectively. PL emission is attributed to oxygen vacancies (Vo). The calcination temperature at 450 °C suggests a better photocatalytic performance under visible light compared with other sample's thermal treatments.

scholarly journals Orientation Control of Helical Nanofilament Phase and Its Chiroptical Applications

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 675 ◽  
Author(s):  
Wongi Park ◽  
Dong Ki Yoon
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Photonic Crystal ◽  
Recent Progress ◽  
Research Interest ◽  
Structural And Optical Properties ◽  
Orientation Control ◽  
Chiral Liquid Crystal ◽  
Crystal Phases ◽  
Liquid Crystal Phases

Chiral liquid crystal phases show fascinating structural and optical properties due to their inherent helical characteristics. Among the various chiral liquid crystal phases, the helical nanofilament phase, made of achiral bent-shaped molecules, has been of keen research interest due to its unusual polar and chiral properties. This review is intended to introduce the recent progress in orientation control and its application to the helical nanofilament phase, which includes topographic confinement, photoalignment, and chiroptical applications such as photonic crystal and chirality sensor.

Progress in the Growth and Characterization of Ge Quantum Dots and Islands

2004 ◽  
Vol 832 ◽  
Author(s):  
J.-M. Baribeau ◽  
N.L. Rowell ◽  
D.J. Lockwood
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Spatial Distribution ◽  
Strain Distribution ◽  
Recent Progress ◽  
Growth Parameters ◽  
Nucleation And Growth ◽  
Structural And Optical Properties

ABSTRACTWe review progress in the growth of Si1-xGex islands and Ge dots on (001) Si. We discuss the evolution of the island morphology with Si1-xGex coverage, and the effect of growth parameters or post-growth annealing on the shape of the islands and dots. We outline some of the structural, and optical properties of Si1-xGex islands and review recent progress in the determination of their composition and strain distribution. We discuss various approaches currently being investigated to engineer Si1-xGex quantum dots and in particular control their size, density and spatial distribution. For example, we show how C pre-deposition on Si (001) can influence nucleation and growth of Ge islands.

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