Photophysical properties of luminescent silicon nanoparticles surface-modified with organic molecules via hydrosilylation

2016 ◽  
Vol 15 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Mari Miyano ◽  
Yuichi Kitagawa ◽  
Satoshi Wada ◽  
Akira Kawashima ◽  
Ayako Nakajima ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Organic Molecules ◽  
Photophysical Properties ◽  
Electron System ◽  
Surface Modified

Luminescent silicon nanoparticles with a π-electron system are expected to be an important factor for creating strongly luminous silicon nanoparticles.

scholarly journals Strong light-matter coupling in dielectric metasurfaces

2020 ◽  
Vol 238 ◽  
pp. 05004
Author(s):  
Gabriel W. Castellanos ◽  
Shunsuke Murai ◽  
T.V. Raziman ◽  
Shaojun Wang ◽  
Mohammad Ramezani ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Silicon Nanoparticles ◽  
Organic Molecules ◽  
Quality Factors ◽  
Low Loss ◽  
Strong Light ◽  
Large Coupling ◽  
Exciton Polaritons ◽  
Coupling Strengths ◽  
Individual Nanoparticles

We demonstrate the strong coupling between excitons in organic molecules and all-dielectric metasurfaces formed by arrays of silicon nanoparticles supporting Mie surface lattice resonances (MSLRs). Compared to Mie resonances in individual nanoparticles, MSLRs have extended mode volumes and much larger quality factors, which enables to achieve collective strong coupling with very large coupling strengths and Rabi energies. Moreover, due to the electric and magnetic character of the MSLR given by the Mie resonance, we show that the hybridization of the exciton with the MSLR results in exciton-polaritons that inherit this character as well. Our results demonstrate the potential of all-dielectric metasurfaces as novel platform to investigate and manipulate exciton-polaritons in low-loss polaritonic devices.

scholarly journals Aldehydes as powerful initiators for photochemical transformations

2020 ◽  
Vol 16 ◽  
pp. 833-857 ◽  
Author(s):  
Maria A Theodoropoulou ◽  
Nikolaos F Nikitas ◽  
Christoforos G Kokotos
Keyword(s):  
Transition Metal ◽  
Organic Synthesis ◽  
Organic Molecules ◽  
Photophysical Properties ◽  
Organic Transformations ◽  
Aliphatic Aldehydes ◽  
Small Organic Molecules ◽  
Photochemical Transformations ◽  
The Way

Photochemistry, the use of light to promote organic transformations, has been known for more than a century but only recently has revolutionized the way modern chemists are thinking. Except from transition metal-based complexes, small organic molecules have been introduced as catalysts or initiators. In this review, we summarize the potential that (aromatic or aliphatic) aldehydes have as photoinitiators. The photophysical properties and photoreactivity of benzaldehyde are initially provided, followed by applications of aldehydes as initiators for polymerization reactions. Finally, the applications to date regarding aldehydes as photoinitiators in organic synthesis are presented.

Visualizing Covalency and Multiple Bonds in Terms of the Electronic Single-Particle Density Matrix

2001 ◽  
Vol 215 (10) ◽  
Author(s):  
T. Asthalter ◽  
M. Walter
Keyword(s):  
Single Particle ◽  
Organic Molecules ◽  
Graphical Representation ◽  
Particle Density ◽  
Electron System ◽  
Covalent Bonding ◽  
Density Matrices ◽  
Multiple Bonds ◽  
Single Particle Density ◽  
Isoelectronic Series

Two-dimensional cuts through spin-integrated single-particle density matrices (SPDMs) have proven to be a valuable tool to discuss the nature of chemical bonding independent of the degree of rotation of the underlying orbitals in Hilbert space. Starting from a straightforward concept for the interpretation of σ bonds, we briefly present how the transition from purely ionic to mainly covalent bonding is mirrored in the off-diagonal features of the SPDM in the isoelectronic series LiF, BeO and BN. Furthermore, we outline one of several possible ways to extend the graphical representation and interpretation of SPDMs to the case of π bonds in organic molecules and apply it to the conjugated π-electron system 1,6-hexadiynediol.

Understanding the electron transfer process in ZnO–naphthol azobenzoic acid composites from photophysical characterisation

2016 ◽  
Vol 18 (32) ◽  
pp. 22179-22187 ◽  
Author(s):  
Leena George ◽  
Athira K. Kunhikannan ◽  
Rajith Illathvalappil ◽  
Divya Ottoor ◽  
Sreekumar Kurungot ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Transfer Process ◽  
Light Absorption ◽  
Organic Molecules ◽  
Semiconductor Nanoparticles ◽  
Electron Transfer Process ◽  
Visible Light Absorption ◽  
Catalytic Sites ◽  
Surface Modified

Semiconductor nanoparticles surface modified with organic molecules capable of visible light absorption and effectively transferring the electrons to the catalytic sites have the potential to be good photocatalysts.

scholarly journals Surface functionalization of aluminosilicate nanotubes with organic molecules

2012 ◽  
Vol 3 ◽  
pp. 82-100 ◽  
Author(s):  
Wei Ma ◽  
Weng On Yah ◽  
Hideyuki Otsuka ◽  
Atsushi Takahara
Keyword(s):  
Surface Functionalization ◽  
Organic Molecules ◽  
Photophysical Properties ◽  
Acid Group ◽  
Water Soluble ◽  
Dimensional Structure ◽  
Inorganic Nanotubes ◽  
Surface Initiated Polymerization ◽  
Recent Developments ◽  
Potential Applications

The surface functionalization of inorganic nanostructures is an effective approach for enriching the potential applications of existing nanomaterials. Inorganic nanotubes attract great research interest due to their one-dimensional structure and reactive surfaces. In this review paper, recent developments in surface functionalization of an aluminosilicate nanotube, “imogolite”, are introduced. The functionalization processes are based on the robust affinity between phosphate groups of organic molecules and the aluminol (AlOH) surface of imogolite nanotubes. An aqueous modification process employing a water soluble ammonium salt of alkyl phosphate led to chemisorption of molecules on imogolite at the nanotube level. Polymer-chain-grafted imogolite nanotubes were prepared through surface-initiated polymerization. In addition, the assembly of conjugated molecules, 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid (HT3P) and 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid 1,1-dioxide (HT3OP), on the imogolite nanotube surface was achieved by introducing a phosphonic acid group to the corresponding molecules. The optical and photophysical properties of these conjugated-molecule-decorated imogolite nanotubes were characterized. Moreover, poly(3-hexylthiophene) (P3HT) chains were further hybridized with HT3P modified imogolite to form a nanofiber hybrid.

Investigation of Laterally-Enhanced Growth Mechanism of Au Electrodeposition onto SiO2 Surface Modified with Organic Molecules

2019 ◽  
Vol 33 (37) ◽  
pp. 1-11
Author(s):  
Chiaki Kobayashi ◽  
Shuhei Yoshida ◽  
Mikiko Saito ◽  
Takayuki Homma
Keyword(s):  
Growth Mechanism ◽  
Organic Molecules ◽  
Sio2 Surface ◽  
Surface Modified

scholarly journals Fabrication of Agglomerate-Free Nanopowders by Hydrothermal Chemical Processing

1998 ◽  
Vol 520 ◽  
Author(s):  
H.K. Schmidt ◽  
R. Nass ◽  
D. Burgard ◽  
R. Nonninger
Keyword(s):  
Continuous Flow ◽  
Organic Molecules ◽  
Hydrothermal Process ◽  
Particle Surface ◽  
Processing Technique ◽  
Chemical Processing ◽  
Small Organic Molecules ◽  
Surface Modifiers ◽  
Direct Precipitation ◽  
Surface Modified

ABSTRACTA chemical processing technique for the fabrication of nanopowders has been developed. The route is based on precipitation processes in solutions, either within aqueous droplets in micro-emulsions in the presence of surface modifiers like surfactants or by direct precipitation in solutions in the presence of these surface modifiers or small organic molecules directly bonded to the particle surface. In order to obtain well crystallized or densified particles, a continuous flow hydrothermal process has been developed which allows the fabrication of agglomerate-free surface modified nanopowders. The surface modification provides a full redispersibility after drying and permits a water-based processing. Nanoparticles preparation for ZrO2, ITO and ATO by this route are described.

scholarly journals Photophysical Properties of Blue-Emitting Silicon Nanoparticles

2009 ◽  
Vol 113 (31) ◽  
pp. 13694-13702 ◽  
Author(s):  
Manuel J. Llansola Portolés ◽  
Felipe Rodriguez Nieto ◽  
Delia B. Soria ◽  
Javier I. Amalvy ◽  
Pablo J. Peruzzo ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Photophysical Properties
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