Nearly hollow Ru–Cu–MoO2 octahedrons consisting of clusters and nanocrystals for high efficiency hydrogen evolution reaction
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With the space and synergic effects, nearly hollow Ru–Cu–MoO 2 octahedrons exhibit fast hydrogen evolution reaction (HER) kinetics, which provides a new approach for designing outstanding performance catalysts for the HER and beyond.Elongated tetrahexahedral Au nanocrystals have been grown in high yields using a seed-mediated growth method. Morphological and structural characterizations show that these Au nanocrystals are single-crystalline and enclosed by 24 high-index {037} facets. They are more electrochemically active than octahedral Au nanocrystals that are enclosed by 8 low-index {111} facets. To date, there have been only a few reports of metal nanocrystals that are enclosed exclusively by high-index facets, including trisoctahedral Au nanocrystals enclosed by 24 {122} facets and tetrahexahedral Pt nanocrystals enclosed by 24 {037} facets. Our tetrahexahedral Au nanocrystals will be an important addition to the family of metal nanocrystals that are enclosed exclusively by high-index facets and will also be useful for fundamental catalytic studies on metal nanocrystals.
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The computer program is prepared for applying Montecarlo simulation and modeling for single-electron nanocrystal memories. The nanocrystal memory device of (5×5) quantum dots is used for studying the relationship between, geometrical dimensions, electrical characteristics and charging effects for single electron static programming characteristics. The nanocrystal inter-dot effects are included. All parameters got in the memory simulation programming are studied and discussed. Keywords: Nanocrystal Memories.
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The electronic properties of metal nanocrystal quantum dot solids in the insulating state have been measured as a function of nanocrystal diameter under conditions of controlled inter-nanocrystal separation. Such properties of these weakly coupled nanocrystal arrays (see image), in particular the array charging energy, can be manipulated through experimental control of the nanocrystal diameter and mean inter-nanocrystal separation.
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CsPbI3 perovskite nanocrystals are a promising optoelectronic material when stabilized in their cubic phase. While ongoing efforts have addressed this structural challenge through a variety of meta-stabilization approaches, the postsynthesis purification of these nanocrystal dispersions has remained a challenge. In this article, we undertake a detailed investigation into the chemical, optical, and structural changes that arise during purification of CsPbI3 nanocrystals. It is found that nanocrystal degradation can only be avoided through the judicious control of additives within each purification cycle. Under optimized additive-to-nanocrystal ratios, multiple purification cycles can be readily achieved, while retaining the quality and phase stability of the CsPbI3. This facile purification protocol ensures the preparation of high purity and high quality CsPbI3 nanocrystal inks that are suitable for better characterization or integration in optoelectronic devices. The approach has been generalized for CsPbX3 (X = Cl-, Br-, and I-).
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这里，我们在水晶的结构(nanocrystallinity ) 或公司 nanocrystals 的涂层代理人的长度导致的 500-nm-thick Co-nanocrystal 3D 超点阵(supracrystals ) 的层次机械行为上报导。通过他们的 nanocrystallinities 的控制增加公司 nanocrystals 的 nanocrystal 形状 anisotropy 导致订与的高水平翻译并且在 supracrystals 以内的 nanocrystals 的 orientational 排列。在在各种各样的规模订的层次，即从在到在 supracrystals 以内的 nanocrystal 超点阵的 nanocrystals 以内的原子格子，在 supracrystals 的幼仔模量与显著变化被相关：从 0.7？？
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Coalescence (physics)
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Catalyst poisoning
Selective catalytic reduction
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Particle (ecology)
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This paper presents a realistic model that explicitly takes into account the electrostatic coupling between the nanocrystals of a disordered layer constituting the floating gate of a non-volatile memory. A statistical study of the neighborhood of a given nanocrystal is carried out, leading to the mean number of neighboring nanocrystals as a function of the radius of the central nanocrystal. We show that the empty neighborhood of every nanocrystal can be represented by an equivalent torus ring in the previous model of a single nanocrystal. Then the effects of charged nanocrystals are taken into account by an appropriate rigid shift of the energy levels of the central nanocrystal. The proposed model is validated by statistical comparisons with exact 3D computations, and the influence of the electrostatic coupling is analyzed and discussed.
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A facile approach to synthesize ZnxCuyInS1.5+x+0.5y nanocrystal emitters was presented. The compositions of these nanocrystals were precisely controlled, and the relative PL quantum yields were up to 40%, with tunable emissions in 450–640 nm.
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