Facile passivation of black phosphorus nanosheets via silica coating for stable and efficient solar desalination

2020 ◽  
Vol 7 (2) ◽  
pp. 414-423 ◽  
Author(s):  
Miao Li ◽  
Qing Zhao ◽  
Siyu Zhang ◽  
Dengyu Li ◽  
Haibo Li ◽  
...  
Keyword(s):  
Double Layer ◽  
Silica Coating ◽  
Silica Shell ◽  
Black Phosphorus ◽  
Solar Desalination

BP nanosheets were passivated by forming a double-layer silica shell that was subsequently used for solar desalination.

scholarly journals Plasmon modes in monolayer and double-layer black phosphorus under applied uniaxial strain

2018 ◽  
Vol 123 (17) ◽  
pp. 174301 ◽  
Author(s):  
S. Saberi-Pouya ◽  
T. Vazifehshenas ◽  
M. Saleh ◽  
M. Farmanbar ◽  
T. Salavati-fard
Keyword(s):  
Double Layer ◽  
Black Phosphorus ◽  
Uniaxial Strain ◽  
Plasmon Modes

Improvement of monodispersity and shape symmetry of silica shell for PbS quantum dots by introducing surface silanization and adjusting reverse micelle size

2021 ◽  
Author(s):  
Kohki MUKAI ◽  
Kosuke Ikeda ◽  
Reo Hatta
Keyword(s):  
Reverse Micelle ◽  
Reverse Micelles ◽  
Silica Coating ◽  
Silica Shell ◽  
Raw Material ◽  
Shell Formation ◽  
Shell Size ◽  
Surface Control ◽  
Micelle Size ◽  
Pbs Quantum Dots

Abstract Increasing the thickness of the quantum dot silica coating layer reduces monodispersity and shape symmetry. This paper reports three effective ways to solve this problem and achieve a large silica-coated QDs, i.e., proper silanization on the QD surface, control of reverse micelle size by adjusting the amount of QD solvent, and two-step formation of silica shell. Proper substitution of ligands on the QD surface in the early stages of silica shell formation was important for uniform coating reaction. An amount of toluene as QD solvent determined the size of reverse micelles during the silica shell formation. There was an optimum combination of inverse micelle size and silica shell size to obtain silica-coated QDs with good monodispersity and high shape symmetry. We succeeded in growing the thick silica shell with expanding reverse micelle size by additionally supplying toluene with the raw material using the optimum silica-coated QDs as growth nucleus

scholarly journals Tuning Localized Surface Plasmon Resonance of Nanoporous Gold with a Silica Shell for Surface Enhanced Raman Scattering

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 251 ◽  
Author(s):  
Wei Li ◽  
Chao Ma ◽  
Ling Zhang ◽  
Bin Chen ◽  
Luyang Chen ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Localized Surface Plasmon Resonance ◽  
Silica Coating ◽  
Silica Shell ◽  
Nanoporous Gold ◽  
Localized Surface Plasmon ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We report the tuning of localized surface plasmon resonance (LSPR) of nanoporous gold (NPG) by silica coating, which also affects the surface enhanced Raman scattering (SERS) of NPG. In this study, controllable silica shell is assembled on the NPG surface, and a fully silica thin layer causes more than 50 nm red-shift of LSPR band due to dielectric medium dependence. Additionally, ~1 nm silica coated NPG film shows excellent SERS enhancement, which is due to electromagnetic coupling between ligaments and local surface plasmon field enhancement within pores, and theoretical analysis indicates that silica coating further improves the coupling effect, which demonstrates the electromagnetic origin of the tuning of SERS effect.

Broadband antireflective double-layer mesoporous silica coating with strong abrasion-resistance for solar cell glass

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25191-25197 ◽  
Author(s):  
Jing Wang ◽  
Chunming Yang ◽  
Yi Liu ◽  
Ce Zhang ◽  
Cong Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Mesoporous Silica ◽  
Power Conversion Efficiency ◽  
Double Layer ◽  
Abrasion Resistance ◽  
Polycrystalline Silicon ◽  
Power Conversion ◽  
Silica Coating ◽  
Silicon Solar Cells

Power conversion efficiency of polycrystalline silicon solar cells increased about 1.3% with this broadband antireflective double-layer mesoporous silica coating.

scholarly journals A Method for the Growth of Uniform Silica Shells on Different Size and Morphology Upconversion Nanoparticles

2021 ◽  
Author(s):  
Elena Ureña-Horno ◽  
Maria Eleni Kyriazi ◽  
Antonios Kanaras
Keyword(s):  
Biomedical Applications ◽  
Silica Coating ◽  
Silica Shell ◽  
High Yield ◽  
Upconversion Nanoparticles ◽  
Nanoparticle Aggregation ◽  
Experimental Conditions ◽  
Nanoparticle Surface ◽  
Size And Morphology ◽  
Shape And Size

Lanthanide-doped upconversion nanoparticles have emerged as attractive candidates for biomedical applications. This is due to their excitation and emission wavelengths, which lay the foundation for deeper penetration depth into biological tissue, higher resolution due to reduced scattering and improved imaging contrast as a result of a decrease in autofluorescence background. Usually, their encapsulation within a biocompatible silica shell is a requirement for their dispersion within complex media or for further functionalization of the upconversion nanoparticle surface. However, the creation of a silica shell around upconversion nanoparticles can be often challenging, many times resulting in partial silica coating or nanoparticle aggregation, as well as the production of a large number of silica particles as a side product. In this work we demonstrate a method to accurately predict the experimental conditions required to form a high yield of silica-coated upconversion nanoparticles, regardless of their shape and size.

Control of Shell Thickness in Silica-Coating of AgI Nanoparticles

2007 ◽  
Vol 29-30 ◽  
pp. 191-194 ◽  
Author(s):  
Y. Kobayashi ◽  
K. Misawa ◽  
M. Takeda ◽  
N. Ohuchi ◽  
A. Kasuya ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Silane Coupling Agent ◽  
Silica Coating ◽  
Silica Shell ◽  
Reaction Conditions ◽  
Stöber Method ◽  
Silane Coupling ◽  
Silica Core ◽  
Teos Concentration ◽  
Shell Particles

Silica-coating of AgI nanoparticles with a Stöber method was carried out to find out reaction conditions for control of the shell thickness. The AgI nanoparticles were prepared from AgClO4 and KI with the use of 3-mercaptopropyltrimethoxysilane (MPS) as a silane coupling agent and dimethylamine (DMA) catalyst for alkoxide hydrolysis. The silica-coating was performed at 4.5×10-6-4.5×10-5 M MPS, 11-20 M water, 0.002-0.1 M DMA and 0.005-0.04 M tetraethylorthosilicate at AgI concentrations of 0.1-1 mM. Consequently, AgI-silica core-shell particles could be prepared with the use of 4.5×10-5 M MPS, 20 M water, 0.01 M DMA and 1 mM AgI. Silica shell thickness could be varied from 15 to 28 nm with an increase in the TEOS concentration from 0.005 to 0.04 M.

Preparation and Characterization of Silica-Coated Indium Oxide Nanoparticles

2008 ◽  
Vol 8 (11) ◽  
pp. 5720-5724 ◽  
Author(s):  
Ming Zhang ◽  
Lifang Shi ◽  
Charles J. O'Connor
Keyword(s):  
Indium Oxide ◽  
Photoluminescence Property ◽  
Silica Coating ◽  
Physical Structure ◽  
Silica Shell ◽  
Oxide Nanoparticles ◽  
Reverse Microemulsion Method ◽  
Oxide Particles ◽  
Average Size

Silica-coated Indium oxide nanoparticles have been successfully synthesized by a modified reverse microemulsion method and characterized by TEM, XRD, EDS and luminescence spectrometer; the single crystal particles are encapsulated by a smooth and uniform silica shell (average size approximately 35 nm in diameter) and show photoluminescence property. The size of the particles and the thickness of the shells can be controlled by adjust the ratio of the reaction agents. The physical structure and optical property of Indium oxide particles remain same during the silica coating process.

Synthesis and Characterization of SiO2/(PMMA/Fe3O4) Magnetic Nanocomposites

2008 ◽  
Vol 8 (4) ◽  
pp. 1797-1802
Author(s):  
Zhifei Wang ◽  
Yafei Guo ◽  
Song Li ◽  
Yueming Sun ◽  
Nongyue He
Keyword(s):  
Magnetic Nanoparticles ◽  
Critical Concentration ◽  
Silica Coating ◽  
Silica Shell ◽  
Silica Nanocomposites ◽  
Stöber Process ◽  
Magnetic Silica ◽  
Biomedical Field ◽  
Pmma Polymer

Magnetic silica nanocomposites (magnetic nanoparticles core coated by silica shell) have the wide promising applications in the biomedical field and usually been prepared based on the famous Stöber process. However, the flocculation of Fe3O4 nanoparticles easily occurs during the silica coating, which limits the amount of magnetic silica particles produced in the Stöber process. In this paper, PMMA/Fe3O4 nanoparticles were used in the Stöber process instead of the “nude” Fe3O4 nanoparticles. And coating Fe3O4 with PMMA polymer beforehand can prevent magnetic nanoparticles from the aggregation that usually comes from the increasing of ionic strength during the hydrolyzation of tetraethoxysilane (TEOS) by the steric hindrance. The results show that the critical concentration of magnetic nanoparticles can increase from 12 mg/L for “nude” Fe3O4 nanoparticles to 3 g/L for PMMA/Fe3O4 nanoparticles during the Stöber process. And before the deposition of silica shell, the surface of PMMA/Fe3O4 nanoparticles had to be further modified by hydrolyzing them in CH3OH/NH3˙H2O mixture solution, which provides the carboxyl groups on their surface to react further with the silanol groups of silicic acid.

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