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Journal of Electronic Materials

, Volume 46, Issue 7, pp 4392–4397 | Cite as

Studies on Optical and Electrical Properties of Hafnium Oxide Nanoparticles

  • Venkatachalam Jayaraman
  • Suresh Sagadevan
  • Rajesh Sudhakar
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In this paper, the synthesis and physico-chemical properties of hafnium oxide nanoparticles (HfO2 NPs) are analyzed and reported. The synthesis was carried out by the precipitation route by using hafnium tetrachloride (HfCl4) as precursor material with potassium hydroxide (KOH) dissolved in Millipore water. In the precipitation technique, the chemical reaction is comparatively simple, low-cost and non-toxic compared to other synthetic methods. The synthesized HfO2 NPs were characterized by using powder x-ray diffraction (PXRD), ultraviolet–visible (UV–Vis) spectroscopy, Raman analysis, and high-resolution transmission electron microscopy (HRTEM). The monoclinic structure of the HfO2 NPs was resolved utilizing x-ray diffraction (XRD). The optical properties were studied from the UV–Vis absorption spectrum. The optical band gap of the HfO2NPs was observed to be 5.1 eV. The Raman spectrum shows the presence of HfO2 NPs. The HRTEM image showed that the HfO2 NPs were of spherical shape with an average particle size of around 28 nm. The energy-dispersive x-ray spectroscopy (EDS) spectrum obviously demonstrated the presence of HfO2 NPs. Analysis and studies on the dielectric properties of the HfO2 NPs such as the dielectric constant, the dielectric loss, and alternating current (AC) conductivity were carried out at varying frequencies and temperatures.

Keywords

Hafnium oxide NPs precipitation UV–visible spectroscopy XRD Raman analysis and HRTEM 
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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • Venkatachalam Jayaraman
    • 1
  • Suresh Sagadevan
    • 2
  • Rajesh Sudhakar
    • 3
  1. 1.Department of PhysicsMeenakshi College of EngineeringChennaiIndia
  2. 2.Department of PhysicsAMET UniversityKanathur, ChennaiIndia
  3. 3.Department of Mechanical EngineeringTagore Engineering CollegeChennaiIndia

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