• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Synthesis and properties of ZnTe and ZnTe/ZnS\ud core/shell semiconductor nanocrystals
【2h】

Synthesis and properties of ZnTe and ZnTe/ZnS\ud core/shell semiconductor nanocrystals

机译：ZnTe和ZnTe / ZnS \ ud的合成及性能 核/壳半导体纳米晶体

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report the synthesis of spherical ZnTe nanocrystals and the successive coating with a ZnS shell to afford\udcore/shell quantum dots. These nanocrystals can represent alternatives to cadmium-based quantum dots\udbut their preparation and properties are challenging and relatively unexplored. The effect of various\udsynthetic parameters on the reaction outcome was investigated, and the resulting nanocrystals were\udcharacterized by TEM, EDX, XPS, and spectroscopic measurements. The optical data indicate that these\udcore/shell quantum dots belong to type I, i.e., both the electron and the hole are confined within the\udZnTe core. Both the ZnTe core and ZnTe/ZnS core/shell quantum dot samples absorb in the visible\udregion and are not luminescent. The ZnS shell preserves the optical properties of the core and improves\udthe chemical and photochemical stability of the nanoparticles in air equilibrated solution, whereas they\udappear to be quite fragile in the solid state. XPS results have evidenced the distinct nature of core and\udcore/shell QDs, confirming the formation of QDs with shells of different thicknesses and their evolution\uddue to oxidation upon air exposure. Anodic photocurrent generation was observed when an ITO\udelectrode functionalized with ZnTe/ZnS nanocrystals was irradiated in the visible region in a\udphotoelectrochemical cell, indicating that the quantum dots perform spectral sensitization of the\udelectron injection into the ITO electrode. Conversely, cathodic photocurrent generation was not\udobserved; hence, the QD-modified electrode performs electrical rectification under a photon energy input.
机译：我们报告了球形ZnTe纳米晶体的合成以及ZnS壳层的连续涂层，以提供\ udcore /壳层量子点。这些纳米晶体可以代表基于镉的量子点的替代物，但是它们的制备和性质是具有挑战性的，并且尚未得到开发。研究了各种\合成参数对反应结果的影响，并通过TEM，EDX，XPS和光谱测量对所得纳米晶体进行了表征。光学数据表明这些\核/壳量子点属于I型，即，电子和空穴都被限制在\ uZnZnTe核内。 ZnTe核和ZnTe / ZnS核/壳量子点样品都在可见光\ ud区域吸收并且不发光。 ZnS壳保留了核的光学特性，并改善了纳米粒子在空气平衡溶液中的化学和光化学稳定性，而在固态时它们似乎相当脆弱。 XPS结果证明了核和核/壳QD的独特性质，证实了具有不同厚度的壳的QD的形成及其由于暴露于空气中而氧化的演变。当在光电化学电池中的可见区域中照射用ZnTe / ZnS纳米晶体功能化的ITO电极时，会观察到阳极光电流的产生，这表明量子点对注入ITO电极的电子辐射进行了光谱增感。相反，没有观察到阴极光电流的产生。因此，QD修饰电极在光子能量输入下执行电整流。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号