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Journal articles on the topic 'Core-shell Heterostructure'

Author: Grafiati

Published: 7 September 2023

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1

Gopalan, Srikanth, and Benjamin Levitas. "Heterostructured Functional Materials through Molten Salt Synthesis for Solid Oxide Fuel Cells and Electrolysis Cells." ECS Meeting Abstracts MA2022-01, no. 38 (July 7, 2022): 1679. http://dx.doi.org/10.1149/ma2022-01381679mtgabs.

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La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)−La0.8Sr0.2MnO3 (LSM) heterostructure crystalline materials have been synthesized in a simple, one-step via reaction-deposition process using a molten salt. Two-phase perovskite composites can be synthesized in times as short as 10 minutes in a molten salt solvent. X-ray diffraction and S/TEM energy dispersive X-ray spectroscopy have been utilized to confirm the formation of an LSM shell on LSCF cores in all samples when adjusting dwell time, core size, weight ratio between core and shell precursors, and weight ratio of powder to salt. Specifically, decreasing the LSCF core size increases core−shell yield. Smaller cores result in a greater density of facets on the crystal surface and provide more favorable sites for LSM heterogeneous nucleation. By decreasing the weight ratio of shell precursor to core decreases shell thickness, and reduces the number of homogeneously nucleated LSM nanoparticles, and thereby increases core−shell yield. Increasing the amount of molten salt solvent relative to precursors decreases supersaturation in the melt and results in less uniform, and isolated shell deposition on the cores. The synthesized heterostructred nanoparticles have been functionalized into electrodes for solid oxide fuel cells and electrolysis cells. Symmetrical cells fabricated from baseline LSCF electrodes are compared with symmetrical cells fabricated from the molten salt-synthesized heterostructred electrodes. The heterostructured electrodes are shown to have significantly lower polarization resistance compared to baseline LSCF electrodes, showing the promise of the molten salt process to achieve heterostructured electrodes with substantially reduced polarization resistance.

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2

Bu, Wenbo, and Jianlin Shi. "Characterization of Highly Luminescent LaPO4:Eu3+/LaPO4 One-Dimensional Core/Shell Heterostructures." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1266–71. http://dx.doi.org/10.1166/jnn.2008.18181.

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Highly luminescent LaPO4:Eu3+/LaPO4 one-dimensional (1D) core/shell heterostructures were successfully synthesized by a mild and simple self-aggregation process under refluxing or hydrothermal conditions. The resulting 1D core/shell heterostructures were characterized using a variety of techniques including X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS) to demonstrate successful coating by the crystalline LaPO4. In addition, a possible formation mechanism for this core/shell heterostructure was proposed. Finally, the photoluminescence property of the LaPO4:Eu3+/LaPO4 1D core/shell heterostructures was investigated in detail, which illustrates that the core/shell heterostructures remarkably increase the luminescence efficiency because the LaPO4 shells effectively eliminate surface trap-states and suppress the energy quenching in the energy-transfer processes.

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3

Ünlü, Hilmi. "A thermoelastic model for strain effects on bandgaps and band offsets in heterostructure core/shell quantum dots." European Physical Journal Applied Physics 86, no. 3 (June 2019): 30401. http://dx.doi.org/10.1051/epjap/2019180350.

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A thermoelastic model is proposed to determine elastic strain effects on electronic properties of spherical Type I and Type II heterostructure core/shell quantum dots (QDs) as a function of dimensions of constituent semiconductors at any temperature. Proposed model takes into account the difference between lattice constants, linear expansion coefficients and anisotropy of elastic moduli (Young's modulus and Poisson's ratio) of constituent semiconductors, respectively. In analogous to lattice mismatch, we introduce so called the elastic anisotropy mismatch in heterostructures. Compressive strain acting on core (shell) side of heterointerfaces in CdSe/CdS, CdSe/ZnS, and ZnSe/ZnS QDs increases (decreases) as shell diameter is increased, which causes increase (decrease) in core bandgap as sell (core) diameter is increased in these nanostructures. Furthermore, there is a parabolic increase in conduction band offsets and core bandgaps in CdSe/CdS, CdSe/ZnS, and ZnSe/ZnS QDs and decrease in conduction band offset and core bandgap of ZnSe/CdS QD as core (shell) diameter increases for fixed shell (core) diameter. Comparison shows that using isotropic elastic moduli in determining band offsets and core band gaps gives better agreement with experiment than anisotropic elastic moduli for core bandgaps of CdSe/CdS, CdSe/ZnS, ZnSe/ZnS, and ZnSe/CdS core/shell QDs. Furthermore, we also show that the strain-modified two band effective mass approximation can be used to determine band offsets by using measured core band gaps in core/shell heterostructure QDs with Type II interface band alignment. Excellent agreement between predicted and measured core bandgaps in CdSe and ZnSe based core/shell QDs suggests that proposed model can be a good design tool for process simulation of core/shell heterostructure QDs.

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4

Chopra, Nitin, Yuan Li, and Kuldeep Kumar. "Cobalt oxide-tungsten oxide nanowire heterostructures: Fabrication and characterization." MRS Proceedings 1675 (2014): 191–96. http://dx.doi.org/10.1557/opl.2014.863.

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ABSTRACTNanowire heterostructures comprised of cobalt oxide and tungsten oxide were fabricated in a core/shell configuration. This was achieved by sputter coating tungsten oxide shells on standing cobalt oxide nanowires on a substrate. To ensure the polycrystallinity of tungsten oxide shell, the nanowire heterostructures were subjected to post-sputtering annealing process. The cobalt oxide nanowires for this study were grown employing a thermal method via vapor-solid growth mechanism. The crystal structures, morphologies, dimensions, and phases at various growth stages of nanowire heterostructures were studied using high resolution electron microscopy, energy dispersive spectroscopy, and X-ray diffraction methods. The interfaces of these nanowire heterostructures were also studied and showed variation in the lattice spacing across the heterostructure diameter. Results indicated that the cobalt oxide nanowires survived multiple processing steps and resulted in stable heterostructure configurations. The investigation shows, for the first time, a dry processing route for the formation of such novel nanowire heterostructures.

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5

Wang, Xuejing, Yung-Chen Lin, Chia-Tse Tai, Seok Woo Lee, Tzu-Ming Lu, Sun Hae Ra Shin, Sadhvikas J. Addamane, et al. "Formation of tubular conduction channel in a SiGe(P)/Si core/shell nanowire heterostructure." APL Materials 10, no. 11 (November 1, 2022): 111108. http://dx.doi.org/10.1063/5.0119654.

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Realizing a tubular conduction channel within a one-dimensional core–shell nanowire (NW) enables better understanding of quantum phenomena and exploration of electronic device applications. Herein, we report the growth of a SiGe(P)/Si core/shell NW heterostructure using a chemical vapor deposition coupled with vapor–liquid–solid growth mechanism. The entire NW heterostructure behaves as a p-type semiconductor, which demonstrates that the high-density carriers are confined within the 4 nm-thick Si shell and form a tubular conduction channel. These findings are confirmed by both calculations and the gate-dependent current–voltage ( I d– V g) characteristics. Atomic resolution microscopic analyses suggest a coherent epitaxial core/shell interface where strain is released by forming dislocations along the axial direction of the NW heterostructure. Additional surface passivation achieved via growing a SiGe(P)/Si/SiGe core/multishell NW heterostructure suggests potential strategies to enhance the tubular carrier density, which could be further modified by improving multishell crystallinity and structural design.

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6

Han, Delong, Wenlei Tang, Naizhang Sun, Han Ye, Hongyu Chai, and Mingchao Wang. "Shape and Composition Evolution in an Alloy Core–Shell Nanowire Heterostructure Induced by Adatom Diffusion." Nanomaterials 13, no. 11 (May 25, 2023): 1732. http://dx.doi.org/10.3390/nano13111732.

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A core–shell nanowire heterostructure is an important building block for nanowire-based optoelectronic devices. In this paper, the shape and composition evolution induced by adatom diffusion is investigated by constructing a growth model for alloy core–shell nanowire heterostructures, taking diffusion, adsorption, desorption and incorporation of adatoms into consideration. With moving boundaries accounting for sidewall growth, the transient diffusion equations are numerically solved by the finite element method. The adatom diffusions introduce the position-dependent and time-dependent adatom concentrations of components A and B. The newly grown alloy nanowire shell depends on the incorporation rates, resulting in both shape and composition evolution during growth. The results show that the morphology of nanowire shell strongly depends on the flux impingement angle. With the increase in this impingement angle, the position of the largest shell thickness on sidewall moves down to the bottom of nanowire and meanwhile, the contact angle between shell and substrate increases to an obtuse angle. Coupled with the shell shapes, the composition profiles are shown as non-uniform along both the nanowire and the shell growth directions, which can be attributed to the adatom diffusion of components A and B. The impacts of parameters on the shape and composition evolution are systematically investigated, including diffusion length, adatom lifetime and corresponding ratios between components. This kinetic model is expected to interpret the contribution of adatom diffusion in growing alloy group-IV and group III-V core–shell nanowire heterostructures.

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7

Meier, Johanna, and Gerd Bacher. "Progress and Challenges of InGaN/GaN-Based Core–Shell Microrod LEDs." Materials 15, no. 5 (February 22, 2022): 1626. http://dx.doi.org/10.3390/ma15051626.

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LEDs based on planar InGaN/GaN heterostructures define an important standard for solid-state lighting. However, one drawback is the polarization field of the wurtzite heterostructure impacting both electron–hole overlap and emission energy. Three-dimensional core–shell microrods offer field-free sidewalls, thus improving radiative recombination rates while simultaneously increasing the light-emitting area per substrate size. Despite those promises, microrods have still not replaced planar devices. In this review, we discuss the progress in device processing and analysis of microrod LEDs and emphasize the perspectives related to the 3D device architecture from an applications point of view.

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8

Babu, Bathula, Shaik Gouse Peera, and Kisoo Yoo. "Fabrication of ZnWO4-SnO2 Core–Shell Nanorods for Enhanced Solar Light-Driven Photoelectrochemical Performance." Inorganics 11, no. 5 (May 15, 2023): 213. http://dx.doi.org/10.3390/inorganics11050213.

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This article describes the effective synthesis of colloidal SnO2 quantum dots and ZnWO4 nanorods using wet chemical synthesis and hydrothermal synthesis, respectively. The resulting ZnWO4-SnO2 core–shell nanorod heterostructure is then made, and its structural, optical, and morphological properties are assessed using XRD, SEM, TEM, and DRS. The heterojunction’s structural confinement increases the exposure of its reactive sites, and its electronic confinement promotes its redox activity. The heterostructure subsequently exhibits a smaller bandgap and better light-harvesting capabilities, resulting in increased photoelectrochemical performance. The heterostructure of core–shell nanorods shows promise for usage in a range of optoelectronic devices and effective solar energy conversion.

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9

Lv, Yuepeng, Sibin Duan, Yuchen Zhu, Peng Yin, and Rongming Wang. "Enhanced OER Performances of Au@NiCo2S4 Core-Shell Heterostructure." Nanomaterials 10, no. 4 (March 27, 2020): 611. http://dx.doi.org/10.3390/nano10040611.

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Transition metal sulfides have attracted a lot of attention as potential oxygen evolution reaction (OER) catalysts. Bimetallic sulfide possesses superior physicochemical properties due to the synergistic effect between bimetallic cations. By introducing a metal-semiconductor interface, the physicochemical properties of transition metal sulfide can be further improved. Using the solvothermal method, Au@NiCo2S4 core-shell heterostructure nanoparticles (NPs) and bare NiCo2S4 NPs were prepared. The measurement of the OER catalytic performance showed that the catalytic activity of Au@NiCo2S4 core-shell heterostructure was enhanced compared to bare NiCo2S4 NPs. At the current density of 10 mA cm−2, the overpotential of Au@NiCo2S4 (299 mV) is lower than that of bare NiCo2S4 (312 mV). The Tafel slope of Au@NiCo2S4 (44.5 mV dec−1) was reduced compared to that of bare NiCo2S4 (49.1 mV dec−1), indicating its faster reaction kinetics. Detailed analysis of its electronic structure, chemical state, and electrochemical impedance indicates that the enhanced OER catalytic performances of bare Au@NiCo2S4 core-shell NPs were a result of its increased proportion of high-valance Ni/Co cations, and its increased electronic conductivity. This work provides a feasible method to improve OER catalytic performance by constructing a metal-semiconductor core-shell heterostructure.

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10

Chen, Shaohua, Xiaoli Zhao, Fazhi Xie, Zhi Tang, and Xiufang Wang. "Efficient charge separation between ZnIn2S4 nanoparticles and polyaniline nanorods for nitrogen photofixation." New Journal of Chemistry 44, no. 18 (2020): 7350–56. http://dx.doi.org/10.1039/d0nj01102a.

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Novel core–shell polyaniline@ZnIn₂S₄ core–shell heterostructure photocatalysts have been prepared using a simple synthesis process, and they exhibit superior performances of photocatalytic N₂ reduction to NH₃ in an atmospheric environment.

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11

Cornet, D. M., and R. R. LaPierre. "InGaAs/InP core–shell and axial heterostructure nanowires." Nanotechnology 18, no. 38 (August 31, 2007): 385305. http://dx.doi.org/10.1088/0957-4484/18/38/385305.

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12

Wang, Yameng, Yan Zhang, Cheng Du, Jian Chen, Zhengfang Tian, Mingjiang Xie, and Liu Wan. "Rational synthesis of CoFeP@nickel–manganese sulfide core–shell nanoarrays for hybrid supercapacitors." Dalton Transactions 50, no. 46 (2021): 17181–93. http://dx.doi.org/10.1039/d1dt03196a.

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13

Xie, Zhiqiang, Sarah Ellis, Wangwang Xu, Dara Dye, Jianqing Zhao, and Ying Wang. "A novel preparation of core–shell electrode materials via evaporation-induced self-assembly of nanoparticles for advanced Li-ion batteries." Chemical Communications 51, no. 81 (2015): 15000–15003. http://dx.doi.org/10.1039/c5cc05577f.

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14

Anandan, Deepak, Che-Wei Hsu, and Edward Yi Chang. "Growth of III-V Antimonide Heterostructure Nanowires on Silicon Substrate for Esaki Tunnel Diode." Materials Science Forum 1055 (March 4, 2022): 1–6. http://dx.doi.org/10.4028/p-y19917.

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Integration of low bandgap antimonide based nanowires on Si substrate has been attracting huge attention for opto-electronic applications. In this work we demonstrated InAs/InSb and InAs/GaSb heterostructure nanowires on Si substrate by metal organic chemical vapor deposition. We grew high quality axial InSb heterostructure segment on InAs stem by self-catalyzed growth technique, which paves a way to tune the crystal structure of InSb. In case of InAs-GaSb core-shell architecture, GaSb crystal quality highly depends on InAs core. We successfully demonstrated basic electrical characteristics of InAs-GaSb core-shell nanowire which exhibits negative differential resistance at 0.8 V and peak-to-valley current ratio of 3.84.

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15

Zhao, Jun, Gencai Pan, Wen Xu, Suyue Jin, Huafang Zhang, Huiping Gao, Miao Kang, and Yanli Mao. "Strong upconverting and downshifting emission of Mn2+ ions in a Yb,Tm:NaYF4@NaLuF4/Mn:CsPbCl3 core/shell heterostructure towards dual-model anti-counterfeiting." Chemical Communications 56, no. 93 (2020): 14609–12. http://dx.doi.org/10.1039/d0cc05663d.

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A Yb,Tm:NaYF₄@NaLuF₄/Mn:CsPbCl₃ quasi-core/shell heterostructure is synthesized with the assistance of silica. The strong upconverting and downshifting emission of Mn²⁺ ions was observed in the nanocomposite with a quasi-core/shell structure.

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16

Le, Anh Thi, Minh Tan Man, and Minh Hoa Nguyen. "Effect of shell thickness on heterostructure of CdSe/CdS core/shell nanocrystals." Hue University Journal of Science: Natural Science 131, no. 1B (June 30, 2022): 5–10. http://dx.doi.org/10.26459/hueunijns.v131i1b.6491.

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Core/shell hetero-nanostructures are promising materials for fabricating optoelectronic devices, photodetectors, bioimaging, and biosensing. The CdSe/CdS core/shell nanocrystals (NCs) were synthesized in a wet chemical reaction. The shell thickness was modified by varying reaction times. The structure and optical properties as a function of the CdS shell thickness were investigated. A systematic redshift of the first exciton absorption peaks and photoluminescent (PL) spectra occurred after coating with CdS confirmed the shell growth over the CdSe core. The PL's intensity increased compared with that of bare NCs. The formation of high-quality NCs with uniform size distribution was shown in the transmission electron microscopy (TEM) image and confirmed by the narrow PL band and small FWHM.

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17

Xie, Yangcun, Xiuwen Wang, and Xu Wen. "Controllable Preparation of Silver Orthophosphate@Carbon Layer Core/Shell Heterostructure with Enhanced Visible Photocatalytic Properties and Stability." Nano 10, no. 02 (February 2015): 1550022. http://dx.doi.org/10.1142/s1793292015500228.

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In this study, silver orthophosphate@carbon layer ( Ag 3 PO 4@ C ) core/shell heterostructure photocatalyst was prepared for the first time. The results showed that a uniform carbon layer was formed around the Ag 3 PO 4. By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer could be easily controlled. Furthermore, the Ag 3 PO 4@ C had remarkable light absorption in the visible region. Photocatalytic tests displayed that the Ag 3 PO 4@ C heterostructures possessed a much higher degradation rate of phenol than pure Ag 3 PO 4 under visible light. The enhanced photocatalytic activity could be attributed to high separation efficiency of photogenerated electrons and holes based on the synergistic effect between carbon as a sensitizer and Ag 3 PO 4. Recycle tests showed that the Ag 3 PO 4@ C core/shell heterostructures maintained high stability over several cycles. The good stability could be attributed to the protection of insoluble carbon layer on the surfaces of Ag 3 PO 4 crystals in aqueous solution.

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18

Hong, Xiao Jie, Xian Fan, Zhao Yang Wu, Guo Qiang Wang, Cheng Yi Zhu, Guang Qiang Li, and Yan Hui Hou. "Preparation and Microstructure Control of One-Dimension Core-Shell Heterostructure of Te/Bi, Te/Bi₂Te₃ by Microwave Assisted Chemical Synthesis." Materials Science Forum 743-744 (January 2013): 153–60. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.153.

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Microstructure engineering of thermoelectric materials can resolve the conflicts of electrical and thermal transports. Especially, one-dimensional structure can obviously improve the thermoelectric figure of merit because of its crystal anisotropy and strong quantum confinement effect. In this paper, the Te nanowires, one-dimensional core-shell heterostructure of Te/Bi and Te/Bi2Te3 were controlled synthesized by microwave assisted chemical synthesis. The effect of PVP concentration and reductant dropping rate on the microstructure of the Te nanowires were investigated. The experimental results showed that with increasing the amount of PVP, the Te nanowires got less crystallinity and its surface become more rough due to its steric hindrance effect. With decreasing reductant dropping rate, the longer and thiner Te nanowires were obtained. Epitaxial growth can describe the relation of core Te and shell Bi (or Bi2Te3). It has been found that Bi shell uniformly surrounded around Te nanowires core, but Bi2Te3 sheets were perpendicular to the c-axis of Te nanowires. The different core-shell heterostructure structure can be obtained by adjusting reaction conditions and controlling diffusion kinetics of Te and Bi.

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19

Wang, Hui, Wei Zhao, Cong-Hui Xu, Hong-Yuan Chen, and Jing-Juan Xu. "Electrochemical synthesis of Au@semiconductor core–shell nanocrystals guided by single particle plasmonic imaging." Chemical Science 10, no. 40 (2019): 9308–14. http://dx.doi.org/10.1039/c9sc02804h.

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20

Majumder, Sutripto, and Babasaheb R. Sankapal. "Facile fabrication of CdS/CdSe core–shell nanowire heterostructure for solar cell applications." New Journal of Chemistry 41, no. 13 (2017): 5808–17. http://dx.doi.org/10.1039/c7nj00954b.

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21

Zhang, Shuaihua, Qian Yang, Xingtao Xu, Xiaohong Liu, Qian Li, Jingru Guo, Nagy L. Torad, et al. "Assembling well-arranged covalent organic frameworks on MOF-derived graphitic carbon for remarkable formaldehyde sensing." Nanoscale 12, no. 29 (2020): 15611–19. http://dx.doi.org/10.1039/d0nr03041d.

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22

Sibirev N V, Berdnikov Y, Shtrom I. V., Ubyivovk E. V., Reznik R. R., and Cirlin G. E. "Kinetics of spontaneous formation of core shell structure in (In,Ga)As nanowires." Technical Physics Letters 48, no. 2 (2022): 28. http://dx.doi.org/10.21883/tpl.2022.02.52841.18869.

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A model of spontaneous formation of the core-shell structure in (In,Ga)As nanowire grown via molecular beam epitaxy without independent radial growth is proposed. Within the framework of the proposed model, the distribution of In across the axis of the nanowire was fitted. Keywords: core-shell nanowire, ternary nanowire, InGaAs nanowire, radial nanowire heterostructure.

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23

Kim, Gi-Yeop, Kil-Dong Sung, Youngmok Rhyim, Seog-Young Yoon, Min-Soo Kim, Soon-Jong Jeong, Kwang-Ho Kim, Jungho Ryu, Sung-Dae Kim, and Si-Young Choi. "Enhanced polarization by the coherent heterophase interface between polar and non-polar phases." Nanoscale 8, no. 14 (2016): 7443–48. http://dx.doi.org/10.1039/c5nr05391a.

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24

Zhou, Zehao, Jian Zhao, Zhenghan Di, Bei Liu, Zhaohui Li, Xuemin Wu, and Lele Li. "Core–shell gold nanorod@mesoporous-MOF heterostructures for combinational phototherapy." Nanoscale 13, no. 1 (2021): 131–37. http://dx.doi.org/10.1039/d0nr07681c.

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A core–shell heterostructure consisting of plasmonic gold nanorods and porphyrinic metal–organic frameworks is synthesized as a promising platform to combine photodynamic therapy and photothermal therapy for enhanced tumor treatment.

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Zhou, Min, Qunhong Weng, Xiuyun Zhang, Xi Wang, Yanming Xue, Xianghua Zeng, Yoshio Bando, and Dmitri Golberg. "In situ electrochemical formation of core–shell nickel–iron disulfide and oxyhydroxide heterostructured catalysts for a stable oxygen evolution reaction and the associated mechanisms." Journal of Materials Chemistry A 5, no. 9 (2017): 4335–42. http://dx.doi.org/10.1039/c6ta09366c.

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26

Hwang, Yunjeong, and Naechul Shin. "Colloidal Synthesis of MoSe2/WSe2 Heterostructure Nanoflowers via Two-Step Growth." Materials 14, no. 23 (November 29, 2021): 7294. http://dx.doi.org/10.3390/ma14237294.

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The ability to control the active edge sites of transition metal dichalcogenides (TMDs) is crucial for modulating their chemical activity for various electrochemical applications, including hydrogen evolution reactions. In this study, we demonstrate a colloidal synthetic method to prepare core-shell-like heterostructures composed of MoSe2 and WSe2 via a two-step sequential growth. By overgrowing WSe2 on the surface of preexisting MoSe2 nanosheet edges, MoSe2-core/WSe2-shell heterostructures were successfully obtained. Systematic comparisons of the secondary growth time and sequential order of growth suggest that the low synthetic temperature conditions allow the stable overgrowth of shells rich in WSe2 on top of the core of MoSe2 with low Gibbs formation energy. The electrochemical analysis confirms that the catalytic activity correlates to the core-shell composition variation. Our results propose a new strategy to control the edge site activity of TMD materials prepared by colloidal synthesis, which is applicable to diverse electrochemical applications.

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Kim, Dongheun, Nan Li, Chris J. Sheehan, and Jinkyoung Yoo. "Degradation of Si/Ge core/shell nanowire heterostructures during lithiation and delithiation at 0.8 and 20 A g−1." Nanoscale 10, no. 16 (2018): 7343–51. http://dx.doi.org/10.1039/c8nr00865e.

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The charging rate-dependent degradation of lithium ion battery anodes based on Si/Ge core/shell nanowire heterostructure was observed. Si/Ge core/shell structure was preserved at the charging rate of 0.8 A g⁻¹. On the other hand, compositional intermixing and loss of Si occurs at the charging rate of 20 A g⁻¹.

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Liu, Jingjing, Wenyao Li, Zhe Cui, Jiaojiao Li, Fang Yang, Liping Huang, Caiyu Ma, and Min Zeng. "CoMn phosphide encapsulated in nitrogen-doped graphene for electrocatalytic hydrogen evolution over a broad pH range." Chemical Communications 57, no. 19 (2021): 2400–2403. http://dx.doi.org/10.1039/d0cc07523j.

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29

Qian, Jing, Xingwang Yang, Zhenting Yang, Gangbing Zhu, Hanping Mao, and Kun Wang. "Multiwalled carbon nanotube@reduced graphene oxide nanoribbon heterostructure: synthesis, intrinsic peroxidase-like catalytic activity, and its application in colorimetric biosensing." Journal of Materials Chemistry B 3, no. 8 (2015): 1624–32. http://dx.doi.org/10.1039/c4tb01702a.

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30

Grenier, Vincent, Sylvain Finot, Lucie Valera, Joël Eymery, Gwénolé Jacopin, and Christophe Durand. "UV-A to UV-B electroluminescence of core-shell GaN/AlGaN wire heterostructures." Applied Physics Letters 121, no. 13 (September 26, 2022): 131102. http://dx.doi.org/10.1063/5.0101591.

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Core-shell GaN/AlGaN multiple quantum wells (MQWs) embedded in a p–n junction are integrated on the upper part of GaN microwires grown by silane-assisted metal organic vapor phase epitaxy. Dispersed wires are then contacted by electron beam induced deposition for fabrication of single wire UV-LED devices. Rectifying diode-like behavior is first demonstrated for both GaN and GaN/AlGaN p-n junctions without a MQW active region. A weak leakage current in the GaN/AlGaN core-shell heterostructure is attributed to an additional conduction path along wire sidewalls. Electroluminescence at 340 nm in UV-A is demonstrated using a GaN (2.6 nm)/Al0.3Ga0.7N (3 nm) heterostructure embedded in a GaN/Al0.3Ga0.7N p–n junction. This value is even decreased to 310 nm by reducing the well thickness to 0.9 nm and increasing the Al-content of barriers (up to 60%) integrated in the GaN/Al0.3Ga0.7N p–n junction. This work demonstrates UV-B emission based on single wire core-shell UV-LEDs.

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Han, Chuang, Shao-Hai Li, Zi-Rong Tang, and Yi-Jun Xu. "Tunable plasmonic core–shell heterostructure design for broadband light driven catalysis." Chemical Science 9, no. 48 (2018): 8914–22. http://dx.doi.org/10.1039/c8sc04479a.

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A tunable core–shell heterostructure design coupling two conceptually different optical absorption models for improved broadband light absorption and hot charge carrier separation toward plasmon-mediated photocatalysis.

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Sadowski, T., and R. Ramprasad. "Core/Shell CdSe/CdTe Heterostructure Nanowires Under Axial Strain." Journal of Physical Chemistry C 114, no. 4 (January 7, 2010): 1773–81. http://dx.doi.org/10.1021/jp907150d.

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Zhang, Genqiang, Wei Wang, and Xiaoguang Li. "Enhanced Thermoelectric Properties of Core/Shell Heterostructure Nanowire Composites." Advanced Materials 20, no. 19 (October 2, 2008): 3654–56. http://dx.doi.org/10.1002/adma.200800162.

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Rad, Maryam, and Saeed Dehghanpour. "ZnO as an efficient nucleating agent and morphology template for rapid, facile and scalable synthesis of MOF-46 and ZnO@MOF-46 with selective sensing properties and enhanced photocatalytic ability." RSC Advances 6, no. 66 (2016): 61784–93. http://dx.doi.org/10.1039/c6ra12410k.

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Wu, Chun, Junjie Cai, Ying Zhu, and Kaili Zhang. "Nanoforest of hierarchical core/shell CuO@NiCo2O4 nanowire heterostructure arrays on nickel foam for high-performance supercapacitors." RSC Advances 6, no. 68 (2016): 63905–14. http://dx.doi.org/10.1039/c6ra10033c.

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Wu, Guoguang, Weitao Zheng, Fubin Gao, Hang Yang, Yang Zhao, Jingzhi Yin, Wei Zheng, Wancheng Li, Baolin Zhang, and Guotong Du. "Near infrared electroluminescence of ZnMgO/InN core–shell nanorod heterostructures grown on Si substrate." Physical Chemistry Chemical Physics 18, no. 30 (2016): 20812–18. http://dx.doi.org/10.1039/c6cp03199d.

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Basu, Kaustubh, Hui Zhang, Haiguang Zhao, Sayantan Bhattacharya, Fabiola Navarro-Pardo, Prasanta Kumar Datta, Lei Jin, Shuhui Sun, Fiorenzo Vetrone, and Federico Rosei. "Highly stable photoelectrochemical cells for hydrogen production using a SnO2–TiO2/quantum dot heterostructured photoanode." Nanoscale 10, no. 32 (2018): 15273–84. http://dx.doi.org/10.1039/c8nr02286k.

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Gang, Chuan, Jiayi Chen, Xu Li, Bo Ma, Xudong Zhao, and Yantao Chen. "Cu₃P@CoO core–shell heterostructure with synergistic effect for highly efficient hydrogen evolution." Nanoscale 13, no. 46 (2021): 19430–37. http://dx.doi.org/10.1039/d1nr06125a.

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Dai, Guozhang, Yang Xiang, Xindi Mo, Zhixing Xiao, Hua Yuan, Jiaxing Wan, Biao Liu, and Junliang Yang. "High-performance CdS@CsPbBr₃ core–shell microwire heterostructure photodetector." Journal of Physics D: Applied Physics 55, no. 19 (February 16, 2022): 194002. http://dx.doi.org/10.1088/1361-6463/ac520b.

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Abstract A core–shell heterojunction has been developed to fabricate efficient optoelectronic devices by optimizing the light absorption and promoting the generation and extraction of charge carriers. Herein, the CdS@CsPbBr3 core–shell microwire (MW) heterojunction was structured via a two-step chemical vapor deposition and was further used to fabricate a UV–Vis photodetector. The photodetector performance is greatly dependent on the thickness of the CsPbBr3 shell. Growth time of 60 min could produce about 80 nm thick CsPbBr3 shell with excellent coverage and adhesion, resulting in optimized performance parameters. As compared with bare cadmium sulfide (CdS) MW photodetector, the CdS@CsPbBr3 core–shell MW heterojunction photodetector exhibits relatively high ratio of photocurrent and dark current (104), much higher light responsivity (319.79 A W−1) and faster response time (6.6 ms). The responsivity is 3.3 times to the value of bare CdS photodetector and the photocurrent increases nearly 10 times. The significant performance parameters mainly result from the formation of a type-II energy band structure and the reduction of the defects states on CdS surface, leading to the obviously improved carriers transport process. The results indicate that the CdS@CsPbBr3 core–shell MW heterojunction is a promising potential candidate to construct high-performance electronic and optoelectronic devices.

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Kao, Yuan-Tse, Shu-Meng Yang, and Kuo-Chang Lu. "Synthesis and Photocatalytic Properties of CuO-CuS Core-Shell Nanowires." Materials 12, no. 7 (April 3, 2019): 1106. http://dx.doi.org/10.3390/ma12071106.

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In this study, an efficient method to synthesize CuO-CuS core-shell nanowires by two-step annealing process was reported. CuO nanowires were prepared on copper foil via thermal oxidation in a three-zone horizontal tube furnace. To obtain larger surface area for photocatalytic applications, we varied four processing parameters, finding that growth at 550 °C for 3 h with 16 °C/min of the ramping rate under air condition led to CuO nanowires of appropriate aspect ratio and number density. The second step, sulfurization process, was conducted to synthesize CuO-CuS core-shell nanowires by annealing with sulfur powder at 250 °C for 30 min under lower pressure. High-resolution transmission electron microscopy studies show that a 10 nm thick CuS shell formed and the growth mechanism of the nanowire heterostructure has been proposed. With BET, the surface area was measured to be 135.24 m2·g−1. The photocatalytic properties were evaluated by the degradation of methylene blue (MB) under visible light irradiation. As we compared CuO-CuS core-shell nanowires with CuO nanowires, the 4-hour degradation rate was enhanced from 67% to 89%. This could be attributed to more effective separation of photoinduced electron and hole pairs in the CuO-CuS heterostructure. The results demonstrated CuO-CuS core-shell nanowires as a promising photocatalyst for dye degradation in polluted water.

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Wang, Lu, Junhua You, Yao Zhao, and Wanting Bao. "Core–shell CuO@NiCoMn-LDH supported by copper foam for high-performance supercapacitors." Dalton Transactions 51, no. 8 (2022): 3314–22. http://dx.doi.org/10.1039/d1dt04002b.

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Greenberg, Ya’akov, Alexander Kelrich, Shimon Cohen, Sohini Kar-Narayan, Dan Ritter, and Yonatan Calahorra. "Strain-Mediated Bending of InP Nanowires through the Growth of an Asymmetric InAs Shell." Nanomaterials 9, no. 9 (September 16, 2019): 1327. http://dx.doi.org/10.3390/nano9091327.

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Controlling nanomaterial shape beyond its basic dimensionality is a concurrent challenge tackled by several growth and processing avenues. One of these is strain engineering of nanowires, implemented through the growth of asymmetrical heterostructures. Here, we report metal–organic molecular beam epitaxy of bent InP/InAs core/shell nanowires brought by precursor flow directionality in the growth chamber. We observe the increase of bending with decreased core diameter. We further analyze the composition of a single nanowire and show through supporting finite element simulations that strain accommodation following the lattice mismatch between InP and InAs dominates nanowire bending. The simulations show the interplay between material composition, shell thickness, and tapering in determining the bending. The simulation results are in good agreement with the experimental bending curvature, reproducing the radius of 4.3 µm (±10%), for the 2.3 µm long nanowire. The InP core of the bent heterostructure was found to be compressed at about 2%. This report provides evidence of shape control and strain engineering in nanostructures, specifically through the exchange of group-V materials in III–V nanowire growth.

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Zhang, Hong-Yu, Yan Yang, Chang-Cheng Li, Hong-Liang Tang, Feng-Ming Zhang, Gui-Ling Zhang, and Hong Yan. "A new strategy for constructing covalently connected MOF@COF core–shell heterostructures for enhanced photocatalytic hydrogen evolution." Journal of Materials Chemistry A 9, no. 31 (2021): 16743–50. http://dx.doi.org/10.1039/d1ta04493a.

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Pelicano, Christian Mark, Itaru Raifuku, Yasuaki Ishikawa, Yukiharu Uraoka, and Hisao Yanagi. "Hierarchical core–shell heterostructure of H2O-oxidized ZnO nanorod@Mg-doped ZnO nanoparticle for solar cell applications." Materials Advances 1, no. 5 (2020): 1253–61. http://dx.doi.org/10.1039/d0ma00313a.

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Liang, Miaomiao, Mingshu Zhao, Haiyang Wang, Qingyang Zheng, and Xiaoping Song. "Superior cycling stability of a crystalline/amorphous Co3S4 core–shell heterostructure for aqueous hybrid supercapacitors." Journal of Materials Chemistry A 6, no. 43 (2018): 21350–59. http://dx.doi.org/10.1039/c8ta08135b.

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Chen, Fei, Ting Wang, Lei Wang, Xiaohong Ji, and Qinyuan Zhang. "Improved light emission of MoS2 monolayers by constructing AlN/MoS2 core–shell nanowires." J. Mater. Chem. C 5, no. 39 (2017): 10225–30. http://dx.doi.org/10.1039/c7tc03231e.

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Wu, Di, Jun Guo, Zhen-Hua Ge, and Jing Feng. "Facile Synthesis Bi2Te3 Based Nanocomposites: Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity." Nanomaterials 11, no. 12 (December 14, 2021): 3390. http://dx.doi.org/10.3390/nano11123390.

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Varying structure Bi2Te3-based nanocomposite powders including pure Bi2Te3, Bi2Te3/Bi core−shell, and Bi2Te3/AgBiTe2 heterostructure were synthesized by hydrothermal synthesis using Bi2S3 as the template and hydrazine as the reductant. Successful realization of Bi2Te3-based nanostructures were concluded from XRD, FESEM, and TEM. In this work, the improvement in the performance of the rhodamine B (RhB) decomposition efficiency under visible light was discussed. The Bi2Te3/AgBiTe2 heterostructures revealed propitious photocatalytic performance ca. 90% after 60 min. The performance was over Bi2Te3/Bi core-shell nanostructures (ca. 40%) and more, exceeding pure Bi2Te3 (ca. 5%). The reason could be scrutinized in terms of the heterojunction structure, improving the interfacial contact between Bi2Te3 and AgBiTe2 and enabling retardation in the recombination rate of the photogenerated charge carriers. A credible mechanism of the charge transfer process in the Bi2Te3/AgBiTe2 heterostructures for the decomposition of an aqueous solution of RhB was also explicated. In addition, this work also investigated the stability and recyclability of a Bi2Te3/AgBiTe2 heterojunction nanostructure photocatalyst. In addition, this paper anticipates that the results possess broad potential in the photocatalysis field for the design of a visible light functional and reusable heterojunction nanostructure photocatalyst.

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Ishiwata, Takumi, Ayano Michibata, Kenta Kokado, Sylvie Ferlay, Mir Wais Hosseini, and Kazuki Sada. "Box-like gel capsules from heterostructures based on a core–shell MOF as a template of crystal crosslinking." Chemical Communications 54, no. 12 (2018): 1437–40. http://dx.doi.org/10.1039/c7cc07158b.

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Yang, Chunming, Guimei Gao, Junjun Zhang, Ruiping Liu, Ruicheng Fan, Ming Zhao, Yongwang Wang, and Shucai Gan. "Surface oxygen vacancy induced solar light activity enhancement of a CdWO4/Bi2O2CO3 core–shell heterostructure photocatalyst." Physical Chemistry Chemical Physics 19, no. 22 (2017): 14431–41. http://dx.doi.org/10.1039/c7cp02136d.

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Krystofiak, Evan S., Eric C. Mattson, Paul M. Voyles, Carol J. Hirschmugl, Ralph M. Albrecht, Marija Gajdardziska-Josifovska, and Julie A. Oliver. "Multiple Morphologies of Gold–Magnetite Heterostructure Nanoparticles are Effectively Functionalized with Protein for Cell Targeting." Microscopy and Microanalysis 19, no. 4 (June 7, 2013): 821–34. http://dx.doi.org/10.1017/s1431927613001700.

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AbstractNanoparticles composed of a magnetic iron oxide core surrounded by a metal shell have utility in a broad range of biomedical applications. However, the presence of surface energy differences between the two components makes wetting of oxide with metal unfavorable, precluding a “core–shell” structure of an oxide core completely surrounded by a thin metal shell. Three-dimensional island growth followed by island coalescence into thick shells is favored over the two-dimensional layer-by-layer growth of a thin, continuous metal coating of a true core–shell. Aqueous synthesis of gold-coated magnetite nanoparticles with analysis by infrared, energy-dispersive X-ray, and electron energy loss spectroscopies; high-resolution transmission electron microscopy; selected area electron diffraction; and high-angle annular dark-field scanning transmission electron microscopy showed two distinct morphologies that are inconsistent with an idealized core–shell. The majority were isolated ~16–22-nm-diameter nanoparticles consisting of ~7-nm-diameter magnetite and a thick deposition of gold, most often discontinuous, with some potentially “sandwiched” morphologies. A minority were aggregates of agglomerated magnetite decorated with gold but displaying significant bare magnetite. Both populations were successfully conjugated to fibrinogen and targeted to surface-activated platelets, demonstrating that iron oxide–gold nanoparticles produced by aqueous synthesis do not require an ideal core–shell structure for biological activity in cell labeling and targeting applications.

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