scholarly journals Effective Mn-Doping in AgInS2/ZnS Core/Shell Nanocrystals for Dual Photoluminescent Peaks

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 263 ◽  
Author(s):  
Ryo Sakai ◽  
Hikaru Onishi ◽  
Satomi Ido ◽  
Seiichi Furumi
Keyword(s):  
Quantum Yield ◽  
Surface Passivation ◽  
Shell Structures ◽  
Core Shell ◽  
Mn Doping ◽  
Yield Value ◽  
The Absolute

We developed the effective Mn-doping procedure for AgInS2(AIS)/ZnS core/shell nanocrystals (NCs) to exhibit dual photoluminescence (PL) peaks. Although the AIS/ZnS core/shell NCs showed solely a single PL peak at ~530 nm, incorporation of a small amount of Mn as a dopant within the AIS/ZnS NCs resulted in the simultaneous emergence of dual PL peaks at ~500 nm (green PL) arising from AIS/ZnS NCs and ~600 nm (orange PL) from the Mn dopants. Furthermore, we succeeded in significantly increasing the absolute PL quantum yield value of dual emissive AIS/ZnS NCs incorporated with Mn dopants from 10% to 34% after surface passivation with another ZnS shell for the formation of core/shell/shell structures.

Enhancement Mechanism of the Photoluminescence Quantum Yield in Highly Efficient ZnS–AgIn5S8 Quantum Dots with Core/Shell Structures

2018 ◽  
Vol 122 (18) ◽  
pp. 10125-10132 ◽  
Author(s):  
Seonghyun Jeong ◽  
Soyeon Yoon ◽  
So Yeon Chun ◽  
Hee Chang Yoon ◽  
Noh Soo Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Shell Structures ◽  
Core Shell ◽  
Enhancement Mechanism ◽  
Highly Efficient ◽  
Photoluminescence Quantum Yield

scholarly journals Surfactant-assisted ZnO processing as a versatile route to ZIF composites and hollow architectures with enhanced dye adsorption

2016 ◽  
Vol 4 (35) ◽  
pp. 13509-13518 ◽  
Author(s):  
Samir El-Hankari ◽  
Jordi Aguilera-Sigalat ◽  
Darren Bradshaw
Keyword(s):  
Rhodamine B ◽  
High Selectivity ◽  
Surface Passivation ◽  
Dye Adsorption ◽  
Shell Structures ◽  
Core Shell ◽  
Surfactant Assisted

Surfactant-assisted surface passivation of ZnO allows the preparation of ZnO@ZIF-8 core–shell composites with high selectivity for rhodamine B separation and full retention of template morphology. The oxide cores can be etched to access a range of hollow or yolk–shell structures.

scholarly journals Combining HR-TEM and XPS to elucidate the core–shell structure of ultrabright CdSe/CdS semiconductor quantum dots

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Florian Weigert ◽  
Anja Müller ◽  
Ines Häusler ◽  
Daniel Geißler ◽  
Dieter Skroblin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Photoelectron Spectroscopy ◽  
Surface Passivation ◽  
Semiconductor Quantum Dots ◽  
Optical Measurements ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
X Ray ◽  
The Core

AbstractControlling thickness and tightness of surface passivation shells is crucial for many applications of core–shell nanoparticles (NP). Usually, to determine shell thickness, core and core/shell particle are measured individually requiring the availability of both nanoobjects. This is often not fulfilled for functional nanomaterials such as many photoluminescent semiconductor quantum dots (QD) used for bioimaging, solid state lighting, and display technologies as the core does not show the application-relevant functionality like a high photoluminescence (PL) quantum yield, calling for a whole nanoobject approach. By combining high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS), a novel whole nanoobject approach is developed representatively for an ultrabright oleic acid-stabilized, thick shell CdSe/CdS QD with a PL quantum yield close to unity. The size of this spectroscopically assessed QD, is in the range of the information depth of usual laboratory XPS. Information on particle size and monodispersity were validated with dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) and compared to data derived from optical measurements. In addition to demonstrating the potential of this novel whole nanoobject approach for determining architectures of small nanoparticles, the presented results also highlight challenges faced by different sizing and structural analysis methods and method-inherent uncertainties.

Designing active mats based on cellulose acetate/polycaprolactone core/shell structures with different release kinetics

2021 ◽  
Vol 261 ◽  
pp. 117849 ◽  
Author(s):  
Adrián Rojas ◽  
Eliezer Velásquez ◽  
Constanza Piña ◽  
María José Galotto ◽  
Carol López de Dicastillo
Keyword(s):  
Cellulose Acetate ◽  
Release Kinetics ◽  
Shell Structures ◽  
Core Shell

scholarly journals A SERS Study of Charge Transfer Process in Au Nanorod–MBA@Cu2O Assemblies: Effect of Length to Diameter Ratio of Au Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 867
Author(s):  
Lin Guo ◽  
Zhu Mao ◽  
Sila Jin ◽  
Lin Zhu ◽  
Junqi Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Absorption Bands ◽  
Au Nanorods ◽  
The Core ◽  
Band Position ◽  
Surface Enhanced Raman ◽  
Core Shell Structure

Surface-enhanced Raman scattering (SERS) is a powerful tool in charge transfer (CT) process research. By analyzing the relative intensity of the characteristic bands in the bridging molecules, one can obtain detailed information about the CT between two materials. Herein, we synthesized a series of Au nanorods (NRs) with different length-to-diameter ratios (L/Ds) and used these Au NRs to prepare a series of core–shell structures with the same Cu2O thicknesses to form Au NR–4-mercaptobenzoic acid (MBA)@Cu2O core–shell structures. Surface plasmon resonance (SPR) absorption bands were adjusted by tuning the L/Ds of Au NR cores in these assemblies. SERS spectra of the core-shell structure were obtained under 633 and 785 nm laser excitations, and on the basis of the differences in the relative band strengths of these SERS spectra detected with the as-synthesized assemblies, we calculated the CT degree of the core–shell structure. We explored whether the Cu2O conduction band and valence band position and the SPR absorption band position together affect the CT process in the core–shell structure. In this work, we found that the specific surface area of the Au NRs could influence the CT process in Au NR–MBA@Cu2O core–shell structures, which has rarely been discussed before.

Template-free synthesis of ordered ZnO@ZnS core–shell arrays for high performance supercapacitors

2016 ◽  
Vol 45 (44) ◽  
pp. 17980-17986 ◽  
Author(s):  
Hailong Yan ◽  
Tong Li ◽  
Yang Lu ◽  
Jinbing Cheng ◽  
Tao Peng ◽  
...  
Keyword(s):  
High Performance ◽  
Shell Structures ◽  
Core Shell ◽  
Template Free

In this article, ordered ZnO@ZnS core–shell structures have been produced on a stainless mesh by a two-step approach without using a template.

Synthesis and characterisation of core–shell structures for orthopaedic surgery

2007 ◽  
Vol 40 (15) ◽  
pp. 3349-3353 ◽  
Author(s):  
Edina Rusen ◽  
Cătălin Zaharia ◽  
Teodora Zecheru ◽  
Bogdan Mărculescu ◽  
Robert Filmon ◽  
...  
Keyword(s):  
Orthopaedic Surgery ◽  
Shell Structures ◽  
Core Shell

In situ electropolymerised silica–polyaniline core–shell structures: Electrode modification and enzyme biosensor enhancement

2007 ◽  
Vol 52 (5) ◽  
pp. 1865-1870 ◽  
Author(s):  
Xiliang Luo ◽  
Anthony J. Killard ◽  
Aoife Morrin ◽  
Malcolm R. Smyth
Keyword(s):  
Shell Structures ◽  
Core Shell ◽  
Electrode Modification ◽  
Enzyme Biosensor
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