Department of Chemistry and Biochemistry, The University of Texas at Austin, University Station A5300, Austin, Texas 78712-0165, USA.
Inorg Chem. 2012 Jan 2;51(1):518-22. doi: 10.1021/ic201977d. Epub 2011 Dec 16.
Developing cheap composite nanoparticle systems that combines a high dielectric constant with good conductivity is important for the future of the electronic industry. In this study, two different sizes, 7.3 ± 2.2 and 5.6 ± 1.9 nm, of HfO(2)@Au core-shell nanoparticles are prepared by using a high-temperature reduction method. The core-shell nanoparticles are characterized by powder X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray analysis (EDX), and UV-visible absorption spectroscopy. HfO(2) exhibits no absorption in the visible region, but the HfO(2)@Au core-shell nanoparticles show a plasmon absorption band at 555 nm that is 25 nm red-shifted as compared to pure gold nanoparticles. According to transmission electron microscopy and energy dispersive X-ray analysis, the HfO(2) particles are coated with approximately three atomic layers of gold.
开发具有高介电常数和良好导电性的廉价复合纳米粒子系统对于电子工业的未来非常重要。在这项研究中，通过高温还原法制备了两种不同尺寸的 HfO(2)@Au 核壳纳米粒子，尺寸分别为 7.3 ± 2.2nm 和 5.6 ± 1.9nm。通过粉末 X 射线衍射、高分辨率透射电子显微镜（HRTEM）、能量色散 X 射线分析（EDX）和紫外可见吸收光谱对核壳纳米粒子进行了表征。HfO(2)在可见光区没有吸收，但 HfO(2)@Au 核壳纳米粒子在 555nm 处显示出等离子体吸收带，与纯金纳米粒子相比红移了 25nm。根据透射电子显微镜和能量色散 X 射线分析，HfO(2)颗粒表面包覆了约三层金原子。
