Facile One-Pot Synthesis of Bifunctional Heterodimers of Nanoparticles:  A Conjugate of Quantum Dot and Magnetic Nanoparticles

Gu, Hongwei; Zheng, Rongkun; Zhang, Xixiang; Xu, Bing

doi:10.1021/ja0496423

Cited by 710 publications

(590 citation statements)

References 19 publications

(14 reference statements)

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“…For example, SPIO has been coated with a luminescent CdSe [60], or Yb or Er [61], or silica dye infused layer [62]. Exotic heterostructures have been reported containing combinations such as a quantum dot with an FePt particle [63] or an FePt and Au particle fusion [64]. In some of our work, we have reported Fe-Au nanoparticles.…”

Section: Multimodality Contrast Agentsmentioning

confidence: 86%

The Integration of Positron Emission Tomography With Magnetic Resonance Imaging

Cherry¹,

Louie

Jacobs

2008

Proc. IEEE

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| A number of laboratories and companies are currently exploring the development of integrated imaging systems for magnetic resonance imaging (MRI) and positron emission tomography (PET). Scanners for both preclinical and human research applications are being pursued. In contrast to the widely distributed and now quite mature PET/computed tomography technology, most PET/MRI designs allow for simultaneous rather than sequential acquisition of PET and MRI data. While this offers the possibility of novel imaging strategies, it also creates considerable challenges for acquiring artifact-free images from both modalities. This paper discusses the motivation for developing combined PET/MRI technology, outlines the obstacles in realizing such an integrated instrument, and presents recent progress in the development of both the instrumentation and of novel imaging agents for combined PET/MRI studies. The performance of the first-generation PET/MRI systems is described. Finally, a range of possible biomedical applications for PET/MRI are outlined.

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Section: Multimodality Contrast Agentsmentioning

confidence: 86%

The Integration of Positron Emission Tomography With Magnetic Resonance Imaging

Cherry¹,

Louie

Jacobs

2008

Proc. IEEE

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“…Detailed investigations on the formation of heterostructures based on either FePt or γ-Fe 2 O 3 and metal chalcogenides of the type MeX (Me = Cd, Zn, Hg; X = S, Se) (Gu et al, 2004;Kwon and Shim, 2005;Kwon et al, 2006;Selvan et al, 2007;Zanella et al, 2008;He et al, 2009;McDaniel and Shim, 2009) have revealed that interfacial strain emerging upon crystallization and induced coalescence in the early post-deposition stages impacted on their topological evolution ( Figure 3A). Examples of hetero-dimer and hetero-oligomer HNCs derived from these pathways are displayed in Figures 3B-E.…”

Section: Post-deposition Crystallization Coalescence and Dewetting Omentioning

confidence: 99%

“…Upon prolonged heating at 280°C, the amorphous MeX shell gradually crystallized, consequently exerting strain across the formed lattice-mismatched seed/MeX heterojunctions. Over time, the shell coalesced, reshaping into a discrete MeX grain aside of the γ-Fe 2 O 3 seed (Gu et al, 2004;Kwon and Shim, 2005;Kwon et al, 2006;Selvan et al, 2007;Zanella et al, 2008;He et al, 2009). Such evolution was explained by considering that the large junction tension in the initially attained core@shell nanostructures could be greatly relieved during the annealing at high temperature, as supply of extra thermal energy promoted coalescence and dewetting of the crystallizing shell into a separate domain aside, which resulted in an obvious reduction of the interfacial area shared between the two materials.…”

Section: Post-deposition Crystallization Coalescence and Dewetting Omentioning

confidence: 99%

“…Indeed, the mean number of MeX domains that could be accommodated on each γ-Fe 2 O 3 seed (Figures 3B,C) (Figures 3D,E). These magnetic-oxide/semiconductor MHNCs could still exhibit appreciable photoluminescence from the semiconductor MeX domains, while retaining the typical superparamagnetic behavior of nanoscale spinel-cubic iron oxide (Gu et al, 2004;Kwon and Shim, 2005;Kwon et al, 2006;Selvan et al, 2007;Zanella et al, 2008;He et al, 2009), which suggests their usefulness as bifunctional probes for dual-mode bioimaging (Selvan et al, 2007;Gao et al, 2009).…”

Section: Post-deposition Crystallization Coalescence and Dewetting Omentioning

confidence: 99%

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Colloidal Magnetic Heterostructured Nanocrystals with Asymmetric Topologies: Seeded-Growth Synthetic Routes and Formation Mechanisms

2016

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Colloidal inorganic nanocrystals (NCs), free-standing crystalline nanostructures generated and processed in solution phase, represent an important class of advanced nanoscale materials owing to the flexibility with which their physical-chemical properties can be controlled through synthetic tailoring of their compositional, structural, and geometric features and the versatility with which they can be integrated in technological fields as diverse as optoelectronics, energy storage/conversion/production, catalysis, and biomedicine. In recent years, building upon mechanistic knowledge acquired on the thermodynamic and kinetic processes that underlie NC evolution in liquid media, synthetic nanochemistry research has made impressive advances, opening new possibilities for the design, creation, and mastering of increasingly complex "colloidal molecules," in which NC modules of different materials are clustered together via solid-state bonding interfaces into free-standing, easily processable multifunctional nanocomposite systems. This review will provide a glimpse into this fast-growing research field by illustrating progress achieved in the wet-chemical development of last-generation breeds of allinorganic heterostructured nanocrystals (HNCs) in asymmetric non-onionlike geometries, inorganic analogues of polyfunctional organic molecules, in which distinct nanoscale crystalline modules are interconnected in heterodimer, hetero-oligomer, and anisotropic multidomain architectures via epitaxial heterointerfaces of limited extension. The focus will be on modular HNCs entailing at least one magnetic material component combined with semiconductors and/or metals, which hold potential for generating enhanced or unconventional magnetic behavior, while offering diversified or even new chemical-physical properties and functional capabilities. The available toolkit of synthetic strategies, all based on the manipulation of seeded-growth techniques, will be described, revisited, and critically interpreted within the framework of the currently understood mechanisms of colloidal heteroepitaxy.

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“…Therefore, polar ZnO is an expected material for many novel applications such as piezoelectric transducers, transparent thin film transistors, chemical gas sensors or biosensors, 1-3 solar cells, ultraviolet (UV) detectors [4][5][6] and spin light-emitting diode (LED). 7 Another attraction of ZnO is in its physical property that can be modulated by ferromagnetic materials. [8][9][10] As it has been known in the development of multiferroic materials, they have been attracted much attention continuously due to the coexistence of ferromagnetic and ferroelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-control-electric and reversal behavior of ZnO/NiFe/ZnO multilayer films

Chi

Wei

et al. 2017

AIP Advances

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The magnetic-control-electric and corresponding dielectric behavior of the ZnO/NiFe/ZnO multilayer films have been demonstrated by applying an ultrathin bimetallic NiFe inserting layer into ZnO films, and fabricated by radio-frequency magnetron sputtering at room temperature without introducing any oxygen gas during deposition process. At first, a high quality crystalline ZnO(002) textured film was deposited and exhibited a dielectric constant value of around 10 confirmed at room temperature with the Agilent 42941B probe and 4294A impedance meters ranged from 40 Hz to 20 MHz. Once ZnO inserted with a 5 nm-thick NiFe inserting layer, the value of dielectric constant was dramatically increased from 10 to 12.5. This phenomenon can be attributed to redistribute the strongly interface charges between ZnO and NiFe layers and accompany with the relaxation of internal stress of ZnO. On the other hand, the external magnetic field induced dielectric variation can also be clearly observed, and the ZnO film with NiFe inserting layer demonstrates a 0.05%-0.10% dielectric tunability. The magnetic-control-electric and corresponding dielectric behavior of ZnO/NiFe/ZnO multilayers with a single inserting NiFe layer compared with that of pure ZnO film also conclude the magnetoelectric effect in present multilayered structures. Moreover, the grain size of the ZnO films was gradually increased from 32.5 nm to 40.5 nm while inserting with an ultrathin NiFe bimetallic layer. This grain structure transition can be attributed to the lattice misfit between ZnO and NiFe. This research work demonstrates that a single NiFe insering layer can effectively control the dielectric and magnetic characters in the ZnO/NiFe/ZnO multilayered structures and provide valuable multifunctional behaviors for potential novel applications design such as ferroic sensor.

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Facile One-Pot Synthesis of Bifunctional Heterodimers of Nanoparticles: A Conjugate of Quantum Dot and Magnetic Nanoparticles

Cited by 710 publications

References 19 publications

The Integration of Positron Emission Tomography With Magnetic Resonance Imaging

The Integration of Positron Emission Tomography With Magnetic Resonance Imaging

Colloidal Magnetic Heterostructured Nanocrystals with Asymmetric Topologies: Seeded-Growth Synthetic Routes and Formation Mechanisms

Magnetic-control-electric and reversal behavior of ZnO/NiFe/ZnO multilayer films

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