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>vwinchina德赢> TU Graz researchers synthesize nanoparticles tailored for special applications

该图示出银氧化锌核 - 壳团簇的分步合成。CREDIT � IEP - TU Graz
该图示出银氧化锌核 - 壳团簇的分步合成。CREDIT � IEP - TU Graz

Abstract:
Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles - smallest portions of bulk material - form the basis for a whole range of new technological developments. Due to the laws of quantum mechanics, such particles measuring only a few millionths of a millimetre can behave completely differently in terms of conductivity, optics or robustness than the same material on a macroscopic scale. In addition, nanoparticles or nanoclusters have a very large catalytically effective surface area compared to their volume. For many applications this allows material savings while maintaining the same performance.

格拉茨研究人员合成的特殊应用量身定制的纳米粒子

奥地利格拉茨|发表于2020年7月31日

Further development of top-level research in Graz in the field of nanomaterials

Researchers at the Institute of Experimental Physics (IEP) at Graz University of Technology have developed a method for assembling nanomaterials as desired. They let superfluid helium droplets of an internal temperature of 0.4 Kelvin (i.e. minus 273 degrees Celsius) fly through a vacuum chamber and selectively introduce individual atoms or molecules into these droplets. "There, they coalesce into a new aggregate and can be deposited on different substrates," explains experimental physicist Wolfgang Ernst from TU Graz. He has been working on this so-called helium-droplet synthesis for twenty-five years now, has successively developed it further during this time, and has produced continuous research at the highest international level, mostly performed in "Cluster Lab 3", which has been set up specifically for this purpose at the IEP.

Reinforcement of catalytic properties

在纳米研究,恩斯特和他的团队现在使用氦滴合成所谓的核 - 壳集群的形成有针对性的报告。簇具有银的3纳米芯和氧化锌的1.5纳米厚的壳。氧化锌是用于,例如,在辐射探测器,用于测量电磁辐射或光催化剂中用于分解有机污染物的半导体。关于材料组合特别之处在于银核提供了一种等离子共振,即,它吸收光,从而导致高的光场的放大。在周围的氧化锌的激发态这使电子,从而形成电子 - 空穴对 - 可以在别处用于化学反应中使用的能量的一小部分,例如直接催化过程在群集表面上。“两个材料特性的组合提高光催化剂极大的效率。另外,可以设想到使用水分解这样的材料用于制氢,”恩斯特说,命名应用的领域。

Nanoparticles for laser and magnetic sensors

除了银 - 锌氧化物组合,研究人员产生与元素铁,钴或镍制成的磁芯和金壳其他有趣的核 - 壳团簇。黄金也有电浆效应,也可防止不必要的氧化磁芯。这些纳米团簇可以影响和由激光器和由外部磁场既控制并且适合于传感器技术,例如。对于这些材料的组合,随温度变化的稳定性测试以及理论计算与由Andreas Hauser公司和玛丽亚皮拉尔去拉拉卡斯特的团队(基础物理研究所在西班牙国家研究委员会中国船舶重工集团公司领导的IEP理论组的合作进行了,马德里),并且可以解释在相变行为如合金的形成,从宏观材料样品偏离。研究结果发表在物理化学杂志。

Ernst now hopes that the findings from the experiments will be rapidly transferred into new catalysts "as soon as possible".

###

这个研究领域是挂靠在专业“高级材料科学”领域,格拉茨的五个战略重点之一。群集3实验室已设置使用从欧洲区域发展基金(ERDF)基金与欧洲联盟的支持和施蒂里亚州。对于颗粒的光电子能谱测量可以用一个光发射电子显微镜在奥地利联邦政府的高等教育区的结构基金框架的帮助下进行。这项工作也由奥地利研究基金FWF的三个项目的支持。

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For more information, please click这里

联系方式:
沃尔夫冈·恩斯特
Em.Univ.-Prof. Dipl.-Phys. Dr.rer.nat.
电话:+43 316 873 8140;电子邮件:

弗洛里安LACKNER
Univ.Ass. Dipl.-Ing. Dr.techn.
电话:+43 316 873 8647;电子邮件:

Andreas HAUSER
Assoc.Prof。MAG。菲尔。硕士工程师。菲尔博士博士TECHN。
Tel.: +43 316 873 8157; E-Mail:

At Institute of Fundamental Physics at the Spanish National Research Council CSIC, Madrid:
Maria Pilar de Lara Castells
电子邮件:

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