Scholarlink

<p>The optical and dielectric characteristics of PVA- 0–0.75 wt&#xa0;% MWCNTs were investigated. The dielectric was obtained at a frequency (<i>f</i>) range of 2 × 10<sup>2</sup>–1.3 × 10<sup>7</sup> Hz and a temperature (T) range of 100–160&#xa0;°C. The refractive index and optical conductivity of the PVA were increased, whereas transmittance and energy gap were decreased with the MWCNTs. The ac conductivity and dielectric constant/loss of PVA were increased with CNTs, <i>f,</i> and T. The q-factor was increased with <i>f</i> and reached its maximum at <i>f</i> = 4.47 MHz; meanwhile, it was decreased with the T or MWCNTs. The F-factor was improved with <i>f</i> up to 13 MHz, or by increasing T and MWCNTs. The hole/electronic conductive mechanism was observed at low/high <i>f</i>, respectively. The Nyquist plots ascribed to the grain and grain boundary impedances and the impedances of grains were decreased with MWCNTs and T. The PVA/MWCNT films qualify to be used in supercapacitors and telecommunications applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of multi-walled carbon nanotubes (MWCNTs) that treated by tannic acid on the optical properties, band gap, Nyquist plots, and dielectric properties of polyvinyl alcohol (PVA) nanocomposite thin films

  • 期刊论文

  • 发表日期：

    2025年2月8日

查看全文
  • Ahmad Hakamy

摘要

The optical and dielectric characteristics of PVA- 0–0.75 wt % MWCNTs were investigated. The dielectric was obtained at a frequency (f) range of 2 × 102–1.3 × 107 Hz and a temperature (T) range of 100–160 °C. The refractive index and optical conductivity of the PVA were increased, whereas transmittance and energy gap were decreased with the MWCNTs. The ac conductivity and dielectric constant/loss of PVA were increased with CNTs, f, and T. The q-factor was increased with f and reached its maximum at f = 4.47 MHz; meanwhile, it was decreased with the T or MWCNTs. The F-factor was improved with f up to 13 MHz, or by increasing T and MWCNTs. The hole/electronic conductive mechanism was observed at low/high f, respectively. The Nyquist plots ascribed to the grain and grain boundary impedances and the impedances of grains were decreased with MWCNTs and T. The PVA/MWCNT films qualify to be used in supercapacitors and telecommunications applications.