Significant enhancement in photocatalytic activity of high quality SiC/graphene core–shell heterojunction with optimal structural parameters

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46771-46779 ◽  
Author(s):  
Wei Lu ◽  
Liwei Guo ◽  
Yuping Jia ◽  
Yu Guo ◽  
Zhilin Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Structural Parameters ◽  
Significant Enhancement ◽  
Core Shell ◽  
High Quality

Generation of reactive oxygen species and charge carriers in plasmonic photocatalytic Au@TiO2 nanostructures with enhanced activity

2018 ◽  
Vol 20 (23) ◽  
pp. 16117-16125 ◽  
Author(s):  
Weiwei He ◽  
Junhui Cai ◽  
Xiumei Jiang ◽  
Jun-Jie Yin ◽  
Qingbo Meng
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Reactive Oxygen ◽  
Charge Carriers ◽  
Significant Enhancement ◽  
Core Shell ◽  
Oxygen Species ◽  
Shell Nanostructures ◽  
Enhanced Activity ◽  
Tio2 Nanostructures

Plasmonic Au@TiO2 core/shell nanostructures exhibit significant enhancement in the generation of ROS, charge carriers and photocatalytic activity.

High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters

2019 ◽  
Author(s):  
Aurelio A. Rossinelli ◽  
Henar Rojo ◽  
Aniket S. Mule ◽  
Marianne Aellen ◽  
Ario Cocina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Equilibrium Shape ◽  
Size Variation ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Quantum Yields ◽  
Core Shell ◽  
Compositional Gradient ◽  
High Quality

<div>Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. <br></div><div>Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.</div>

scholarly journals Epitaxial Growth of Ordered In-Plane Si and Ge Nanowires on Si (001)

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 788
Author(s):  
Jian-Huan Wang ◽  
Ting Wang ◽  
Jian-Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Epitaxial Growth ◽  
Molecular Beam ◽  
Core Shell ◽  
High Quality ◽  
Quantum Devices ◽  
Wafer Scale ◽  
Transmission Electron ◽  
Controllable Growth

Controllable growth of wafer-scale in-plane nanowires (NWs) is a prerequisite for achieving addressable and scalable NW-based quantum devices. Here, by introducing molecular beam epitaxy on patterned Si structures, we demonstrate the wafer-scale epitaxial growth of site-controlled in-plane Si, SiGe, and Ge/Si core/shell NW arrays on Si (001) substrate. The epitaxially grown Si, SiGe, and Ge/Si core/shell NW are highly homogeneous with well-defined facets. Suspended Si NWs with four {111} facets and a side width of about 25 nm are observed. Characterizations including high resolution transmission electron microscopy (HRTEM) confirm the high quality of these epitaxial NWs.

scholarly journals Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO3 core–shell nanostructures

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2733-2743
Author(s):  
Parisa Talebi ◽  
Harishchandra Singh ◽  
Ekta Rani ◽  
Marko Huttula ◽  
Wei Cao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Surface Plasmon ◽  
Core Shell ◽  
Plasmonic Resonance ◽  
Surface Plasmonic Resonance ◽  
Shell Nanostructures

Surface plasmonic resonance enabled Ni@NiO/NiCO3 core–shell nanostructures as promising photocatalysts for hydrogen evolution under visible light.

A core–shell structured magnetic Ag/AgBr@Fe2O3 composite with enhanced photocatalytic activity for organic pollutant degradation and antibacterium

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 71035-71045 ◽  
Author(s):  
Shuquan Huang ◽  
Yuanguo Xu ◽  
Zhigang Chen ◽  
Meng Xie ◽  
Hui Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Organic Pollutant ◽  
Core Shell ◽  
Pollutant Degradation ◽  
Antibacterial Ability ◽  
Highly Efficient ◽  
Organic Pollutant Degradation

A core–shell structured Ag/AgBr@Fe2O3 composite was prepared successfully. It has magnetic properties, highly efficient photocatalytic activity and antibacterial ability.

Effect of Metal Gradient In Nano Wall of Stratified Type Photocatalyst

2009 ◽  
Vol 631-632 ◽  
pp. 339-344
Author(s):  
Tsugumi Hayashi ◽  
Yohei Baba ◽  
Toshiharu Taga ◽  
Shun Yokoyama ◽  
Hiroaki Suzuki ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Detailed Analysis ◽  
Crystalline Structure ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Shell Type ◽  
Metal Element ◽  
Egg Shell

Objective of study was the development of core-shell type ZnS-CdS photocatalyst with the stratified morphology. To form the stratified morphology, condition of the precursor is extremely important. For this purpose, three types of precursors, thus core-shell type, egg-shell type and uniform type, was tried to synthesize by utilizing the results of the calculation. The size of the synthesized precursor particles was about 40-100 nm. Main phase of the particle was gradually changed from ZnO (pH8.0) to Cd(OH)2 (pH9.5). Detailed analysis of the synthesized precursor was clearly demonstrated that these have the crystalline structure and each metal element was co-existed in one particle. Therefore, it could be concluded that core-shell type or uniform type precursor was successfully synthesized. Core-shell type ZnS-CdS stratified photocatalyst could be successfully synthesized by sulfurization for 1h, and it shows the high photocatalytic activity under visible light irradiation.

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