Optical Properties of Double-Shell Hollow ZnS–Ag2S Nanoparticles
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The light emission properties of semiconductor nanoparticles are important for their applications in optical imaging, sensors, or lasers. ZnS nanoparticles are particularly useful for these applications, but the main hindrance for their widespread use are the low emission properties of pure ZnS nanoparticles. Formation of a core/shell structure is one way that has been used to improve the emission properties of pure ZnS in recent years. This study reports a unique synthesis route and the optical properties of double-shell ZnS–Ag2S hollow nanoparticles. Light emission properties of hollow Ag2S/ZnS are maximum (39%) compared to those of hollow ZnS/Ag2S (21%) or pure ZnS (14%) nanoparticles, and these properties highly depend on the external ZnS layer thickness.Keywords:
Light emission
The surface energy of a nanoparticle accounts for a significant fraction of the whole nanoparticle energy and its contribution becomes more important as the nanoparticle size gets smaller. In short, a nanoparticle becomes more unstable and more reactive as it becomes smaller. There are considerable examples of nanoparticle conversion into new nanoparticle systems by utilizing this surface-induced nanoparticle instability and reactivity. In this Highlight, we report the underlying principle of nanoparticle instability as well as various examples of chemical conversions of precursor nanoparticles to novel nanoparticle systems, which are unapproachable by a direct synthetic route.
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Design of any product is primarily based on the characteristics of various parameters that will be having direct influence on their functionality. The aim of this study is to understand the influence of physical parameters of coconuts, viz. shell diameter and shell thickness on the shell halving force, so that proper designing and development of an efficient energy efficient shell-splitting tool can be done. In line with this objective, experimental investigations have been carried out on 50 green and 50 dry fully matured coconuts to measure force needed in compression for rupturing the shell equatorially. The experimentations have been carried out using a Universal Testing Machine. Results suggest a negative correlation between shell diameter and shell halving force. However, influence of shell thickness on shell halving force has been found to be less significant. Combined analysis of the results suggests that coconuts having large shell diameter and small thickness require lower shell halving force.
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The paper introduces a new technology of chestnut shell-peeling based on flexible rub theory, developed corresponding shell-peeling equipment, gave the optimum technological condition of chestnut shell-peeling, and also points out the matters needing attention during the shell-peeling process.
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MIS structures on GaN consisting of Au-NaI-GaN or Au-Al2O3-GaN with insulator thickness <100 Å have been fabricated with the aim of producing light-emitting diodes with emission in the uv and blue spectral region at low bias. I-V characteristics are consistent with a tunneling carrier transport mechanism, and light emission typically occurs for voltages 2–3 V. The spectral behavior of electroluminescence (EL) is in good agreement with photoluminescence (PL) data in the uv and blue spectral region. Suggestions for further work to improve radiant power output from such devices are presented.
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A size and condensation controlled Pd nanoparticle is reported. The Pd nanoparticles are prepared by a gas condensation method with He gas, so called dry process. A fabrication of the nanoparticle by means of the dry process is an excellent way, because there are little contaminations on the most lateral surface of the nanoparticle than the nanoparticle by the wet process. Characterizations by TEM and AFM show that the fabricated Pd nanoparticle has a spherical shape, a few nm size in diameter and highly dispersed on the substrate. It is found that there are two chemical states in the Pd nanoparticle. One is an oxidized part at the surface and the other is a bulk part. [DOI: 10.1380/ejssnt.2006.258]
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Composited nanoparticles，由 Mn3O4，做 S 的 Mn3O4 和 S 组成，被一起沉淀反应综合， Mn3O4 nanoparticles 然后在把纯 S 从 composited nanoparticles 移开以后被获得。有更大的格子常数的 Mn3O4 类型阶段一被做硫形成。在在居里温度(TC ) 下面的固定温度，做 S 的 Mn3O4/S composited nanoparticles 的磁化比 Mn3O4 nanoparticles 的小。堵住的温度分别地是为合成的做 S 的 Mn3O4/S 和 Mn3O4 nanoparticles 的 36.3 和 34.8 K。做 S 的 Mn3O4/S 的 anisotropy 地合成被决定是大约 55.3 kOe。
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