Synthesis and characterization of the CAT's eye-shaped CoO@SiO2 nanoshell aqueous colloids

Kwon, Min Jae; Jung, Hyunseung; Park, Jeong Hoon

doi:10.1016/j.jpcs.2011.11.018

Cited by 16 publications

(2 citation statements)

References 16 publications

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“…Concerning wurtzite‐CoO, more systematic studies have only recently been carried out. In particular, wurtzite‐CoO has been found to be rather stable in nanoparticle form and has been reported to have appealing catalytic, optical, semiconducting, electrochemical, and biomedical properties, with possible applications in lithium batteries, solar energy conversion, photoacoustic imaging, and water splitting . In addition, this structure has been shown to appear as a strain relief or polarity compensation phase in rock salt‐CoO thin films, as phase separation in Co‐doped ZnO ultrathin films and in passivation CoO shells of Co nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles

Roca

Golosovsky

Winkler

et al. 2018

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Although cubic rock salt-CoO has been extensively studied, the magnetic properties of the main nanoscale CoO polymorphs (hexagonal wurtzite and cubic zinc blende structures) are rather poorly understood. Here, a detailed magnetic and neutron diffraction study on zinc blende and wurtzite CoO nanoparticles is presented. The zinc blende-CoO phase is antiferromagnetic with a 3rd type structure in a face-centered cubic lattice and a Néel temperature of T (zinc-blende) ≈225 K. Wurtzite-CoO also presents an antiferromagnetic order, T (wurtzite) ≈109 K, although much more complex, with a 2nd type order along the c-axis but an incommensurate order along the y-axis. Importantly, the overall magnetic properties are overwhelmed by the uncompensated spins, which confer the system a ferromagnetic-like behavior even at room temperature.

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Section: Introductionmentioning

confidence: 99%

Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles

Roca

Golosovsky

Winkler

et al. 2018

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“…Only recently, silica-coating with the reverse microemulsion method was successfully applied to anisotropic NCs like NRs − and tetrapods. , However, the incorporation in silica causes a drastic decrease in the particles’ aspect ratio as the shape changes into dumbbells and ellipsoids. − Moreover, uniform shells thinner than 10 nm cannot be obtained by the currently available methods. Hence, a method to coat highly anisotropic NCs with a uniform and tunable silica shell that preserves the original shape is highly desirable, since the shape anisotropy is indispensable for certain applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Method To Incorporate Anisotropic Semiconductor Nanocrystals of All Shapes in an Ultrathin and Uniform Silica Shell

et al. 2014

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In this work, we present a method for the incorporation of anisotropic colloidal nanocrystals of many different shapes in silica in a highly controlled way. This method yields a uniform silica shell, with thickness tunable from 3 to 17 nm. The silica shell perfectly adapts to the shape of the nanocrystals, preserving their anisotropy, a crucial requisite for shape-dependent applications. Our method is based on an adaptation of the reverse microemulsion method. High control over the nucleation and growth of the shell is obtained by slowing down the hydrolysis and condensation rates of the silica precursor by lowering the ammonia concentration. This is shown to be essential for the formation of a uniform silica shell in the case of CdSe/CdS core/shell nanorods. Additionally, the general applicability of this method is demonstrated by coating different anisotropic semiconductor nanocrystals such as nanostars and 2D nanoplatelets. These results thus represent a crucial step toward the fabrication of highly processable and functionalized anisotropic nanoparticles.

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Mesoporous Silica Layer: Preparation and Opportunity

Ogawa

2016

The Chemical Record

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Periodic mesoporous silicas, which were prepared from silica-surfactant mesostructured materials, have been investigated for a wide range of application due to their very large surface area, high porosity, pore size uniformity and variation, periodic pore arrangement and possible pore surface modification, after the pioneering papers on the formation of mesoporous silicas (MCM-41 and FSM-16). Morphosyntheses from such macroscopic morphologies as bulk monolith and film to nanoscopic ones, nanoparticles and their stable suspension, make mesoporous materials more attractive for applications and detailed characterization. Mesoporous silicas have been studied initially for such applications as adsorbent and catalyst, and more recently, optical, electronic, and bio-related applications have been investigated. This review summarizes the studies on mesoporous silica film to highlight the present status and future of the preparation, characterization and application of the mesoporous silica film.

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Synthesis and characterization of the CAT's eye-shaped CoO@SiO2 nanoshell aqueous colloids

Cited by 16 publications

References 16 publications

Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles

Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles

Method To Incorporate Anisotropic Semiconductor Nanocrystals of All Shapes in an Ultrathin and Uniform Silica Shell

Mesoporous Silica Layer: Preparation and Opportunity

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