Morphology-dependent photo-catalysis of bare zinc oxide nanocrystals
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Three kinds of ZnO nanocrystals (NCs) with different morphologies including multilayer disks, truncated hexagonal cones and short rods have been successfully synthesized by a solvothermal method without participation of surface capping agents. The water content in used N,N-dimethylformamide (DMF) solvent has been found to play an important role in controlling the formation of crystal planes, concentration of defects, and morphology of the ZnO NCs. The photocatalytic degradation of methyl orange in aqueous solution has been investigated in detail by employing the three kinds of ZnO NCs as photocatalysts under UV irradiation separately. Apparent reaction rates for different morphological ZnO NCs follow the order of short rods > truncated hexagonal cones > multilayer disks, implying strong photostability-dependent photocatalysis behavior of the ZnO NCs. Combined with photocorrosion, possible reasons for the difference of photocatalytic activity among them are discussed.Keywords:
Methyl orange
Dimethyl formamide
Morphology
Rod
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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Despite extensive studies on controlling the morphological and compositional structures of nanocrystals to adjust their physical and chemical properties, it is still challenging to verify the exact formation mechanism of nanocrystals. Here, we report an efficient cysteine-based quenching strategy that allows an unequivocal exploration of the growth process of nanocrystals. Intermediate nanostructures formed during the synthesis of various metal nanocrystals having different compositions and morphologies could readily be analyzed after the synthesis was quenched by adding cysteine to the reaction solution, enabling the revealing of nanocrystal growth mechanisms. This method exhibited distinctly high quenching ability compared to conventional quenching methods, which could be ascribed to the capability of cysteine for forming stable complexes with metal precursors and preventing intermediates from deformation and further growth. The present strategy will improve the understanding of the nanocrystal growth mechanism and, hence, provide an opportunity to devise unprecedented nanocrystal systems.
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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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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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