Microwave absorbing behavior of metal dispersed TiO2 nanocomposites

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2014-03, Vol.25 (2), p.483-489
• Main Authors: Kumar, Abhishek, Agarwala, Vijaya, Singh, Dharmendra
• Format: Article
• Language: English
• Subjects: Ball milling; Metal dispersion; Microwave absorption; TiO2
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2013.07.006

[Display omitted] •Metal particles are dispersed in prepared TiO2 nanoparticles via milling process.•Detailed study for the phase formation and morphology are performed.•Microwave dielectric and absorption studies of nanocomposite are carried out.•Enhancement in absorption is observed by the dispersion of metal particles. Metal dispersed TiO2 nanocomposites were prepared by milling process. The microwave absorbing characteristics of the prepared nanocomposites with epoxy were studied in the 8.2–12.4GHz frequency range for the microwave absorption application. The measured relative complex permittivity of metal dispersed nanocomposite-epoxy indicates higher values in comparison to the pure TiO2-epoxy nanocomposite. The Reflection loss (RL) values were calculated for thickness from 0.1 to 2.2mm with an interval of 0.1mm and the maximum value of RL found for TiO2-epoxy nanocomposite was −4.96dB at 10.21GHz frequency for 2.0mm thickness. Whereas, RL value is improved to a maximum value of −13.67dB at 10.13GHz with Al dispersion (1.8mm thickness) and −7.24dB at 10.38GHz with Ni dispersion (1.3mm thickness). This study suggests the effectiveness metal particles dispersion for the development of thin microwave absorbers as well as increasing the level of RL.