The synthesis of core–shell nanowires with intense dielectric and magnetic resonance properties at microwave frequency

2019 ◽  
Vol 7 (12) ◽  
pp. 3590-3597 ◽  
Author(s):  
Kun Zhang ◽  
Fan Wu ◽  
Yingzhi Jiao ◽  
Mengxiao Sun ◽  
Yilu Xia ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Microwave Frequency ◽  
Core Shell ◽  
Resonance Properties ◽  
Shell Nanowires

Highly intense narrowband dielectric and magnetic resonance at microwave frequency.

Magnetic resonance on core-shell nanowires with notches

2011 ◽  
Vol 99 (10) ◽  
pp. 101907 ◽  
Author(s):  
Lina Xu ◽  
Zhi-Jian Zhang ◽  
Bong Jae Lee
Keyword(s):  
Magnetic Resonance ◽  
Core Shell ◽  
Shell Nanowires

Monodisperse NaYbF4 : Tm3+/NaGdF4 core/shell nanocrystals with near-infrared to near-infrared upconversion photoluminescence and magnetic resonance properties

Nanoscale ◽  
2011 ◽  
Vol 3 (5) ◽  
pp. 2003 ◽  
Author(s):  
Guanying Chen ◽  
Tymish Y. Ohulchanskyy ◽  
Wing Cheung Law ◽  
Hans Ågren ◽  
Paras N. Prasad
Keyword(s):  
Magnetic Resonance ◽  
Near Infrared ◽  
Core Shell ◽  
Resonance Properties ◽  
Upconversion Photoluminescence

One-Dimensional TiO2@GaON Core-Shell Nanowires with Controlled Shell Thickness from Atomic Layer Deposition for Stable and Efficient Photoelectrochemical Water Splitting

2019 ◽  
Author(s):  
Jiajia Tao ◽  
Hong-Ping Ma ◽  
Kaiping Yuan ◽  
Yang Gu ◽  
Jianwei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Band Gap ◽  
Water Splitting ◽  
Atomic Layer ◽  
Photoelectrochemical Water Splitting ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Shell Nanowires

<div>As a promising oxygen evolution reaction semiconductor, TiO2 has been extensively investigated for solar photoelectrochemical water splitting. Here, a highly efficient and stable strategy for rationally preparing GaON cocatalysts on TiO2 by atomic layer deposition is demonstrated, which we show significantly enhances the</div><div>photoelectrochemical performance compared to TiO2-based photoanodes. For TiO2@20 nm-GaON core-shell nanowires a photocurrent density up to 1.10 mA cm-2 (1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of TiO2 NWs. Furthermore, the oxygen vacancy formation on GaON as well as the band gap matching with TiO2 not only provides more active sites for water oxidation but also enhances light absorption to promote interfacial charge separation and migration. Density functional theory studies of model systems of GaON-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaON core-shell nanowires provide a deeper understanding and universal strategy for enhancing photoelectrochemical performance of photoanodes now available. </div>

scholarly journals Silica-Coated Fe3O4 Nanoparticles as a Bifunctional Agent for Magnetic Resonance Imaging and ZnII Fluorescent Sensing

2021 ◽  
Vol 20 ◽  
pp. 153303382110365
Author(s):  
Lin Qiu ◽  
Shuwen Zhou ◽  
Ying Li ◽  
Wen Rui ◽  
Pengfei Cui ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agent ◽  
Quantum Interference ◽  
Inductively Coupled Plasma ◽  
Fluorescence Emission ◽  
Mri Contrast Agent ◽  
Core Shell ◽  
Resonance Imaging

Bifunctional magnetic/fluorescent core-shell silica nanospheres (MNPs) encapsulated with the magnetic Fe3O4 core and a derivate of 8-amimoquinoline (N-(quinolin-8-yl)-2-(3-(triethoxysilyl) propylamino) acetamide) (QTEPA) into the shell were synthesized. These functional MNPs were prepared with a modified stöber method and the formed Fe3O4@SiO2-QTEPA core-shell nanocomposites are biocompatible, water-dispersible, and stable. These prepared nanoparticles were characterized by X-ray power diffraction (XRD), transmission electron microscopy (TEM), thermoelectric plasma Quad II inductively coupled plasma mass spectrometry (ICP-MS), superconducting quantum interference device (SQUID), TG/DTA thermal analyzer (TGA) and Fourier transform infrared spectroscopy (FTIR). Further application of the nanoparticles in detecting Zn2+ was confirmed by the fluorescence experiment: the nanosensor shows high selectivity and sensitivity to Zn2+ with a 22-fold fluorescence emission enhancement in the presence of 10 μM Zn2+. Moreover, the transverse relaxivity measurements show that the core-shell MNPs have T2 relaxivity (r2) of 155.05 mM−1 S−1 based on Fe concentration on the 3.0 T scanner, suggesting that the compound can be used as a negative contrast agent for MRI. Further in vivo experiments showed that these MNPs could be used as MRI contrast agent. Therefore, the new nanosensor provides the dual modality of magnetic resonance imaging and optical imaging.

scholarly journals Broadband Meta‐Absorber with Au/Ni Core–Shell Nanowires for Solar Vapor Generator

2021 ◽  
Vol 5 (7) ◽  
pp. 2100185
Author(s):  
Soomin Son ◽  
Jaemin Park ◽  
Sucheol Ju ◽  
Daihong Huh ◽  
Junho Jun ◽  
...  
Keyword(s):  
Core Shell ◽  
Vapor Generator ◽  
Shell Nanowires

scholarly journals Microresonators and Microantennas—Tools to Explore Magnetization Dynamics in Single Nanostructures

2021 ◽  
Vol 7 (2) ◽  
pp. 28
Author(s):  
Hamza Cansever ◽  
Jürgen Lindner
Keyword(s):  
Magnetic Resonance ◽  
Spin Wave ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Relaxation Times ◽  
Magnetic Nanostructures ◽  
Microwave Frequency ◽  
Direct Access ◽  
Magnetization Dynamics ◽  
G Factor

The phenomenon of magnetic resonance and its detection via microwave spectroscopy provide insight into the magnetization dynamics of bulk or thin film materials. This allows for direct access to fundamental properties, such as the effective magnetization, g-factor, magnetic anisotropy, and the various damping (relaxation) channels that govern the decay of magnetic excitations. Cavity-based and broadband ferromagnetic resonance techniques that detect the microwave absorption of spin systems require a minimum magnetic volume to obtain a sufficient signal-to-noise ratio (S/N). Therefore, conventional techniques typically do not offer the sensitivity to detect individual micro- or nanostructures. A solution to this sensitivity problem is the so-called planar microresonator, which is able to detect even the small absorption signals of magnetic nanostructures, including spin-wave or edge resonance modes. As an example, we describe the microresonator-based detection of spin-wave modes within microscopic strips of ferromagnetic A2 Fe60Al40 that are imprinted into a paramagnetic B2 Fe60Al40-matrix via focused ion-beam irradiation. While microresonators operate at a fixed microwave frequency, a reliable quantification of the key magnetic parameters like the g-factor or spin relaxation times requires investigations within a broad range of frequencies. Furthermore, we introduce and describe the step from microresonators towards a broadband microantenna approach. Broadband magnetic resonance experiments on single nanostructured magnetic objects in a frequency range of 2–18 GHz are demonstrated. The broadband approach has been employed to explore the influence of lateral structuring on the magnetization dynamics of a Permalloy (Ni80Fe20) microstrip.

scholarly journals Correlated optical and structural analyses of individual GaAsP/GaP core–shell nanowires

2019 ◽  
Vol 30 (30) ◽  
pp. 304001 ◽  
Author(s):  
C Himwas ◽  
S Collin ◽  
H-L Chen ◽  
G Patriarche ◽  
F Oehler ◽  
...  
Keyword(s):  
Core Shell ◽  
Shell Nanowires
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