The biodegradable hybrid polymer nanocomposite (PNC) films comprising silica (SiO₂) and alumina (Al₂O₃) nanoparticles as inorganic nanofillers and the poly(vinyl pyrrolidone) (PVP) as organic host matrix (i.e., PVP–x wt% SiO₂ and PVP–x wt% Al₂O₃ for x = 0, 1, 3 and 5) have been prepared by aqueous solution-casting method. X-ray diffraction (XRD) study reveals that these nanocomposite materials are highly amorphous. The dielectric spectroscopy of these different nanofiller concentrations PNC films has been carried out in the frequency range from 20 Hz to 1 MHz at a fixed temperature and also for 3 wt% nanofillers containing PNC films with the temperature variation. The results confirm that the complex dielectric permittivity of these hybrid films is influenced by the interfacial polarization in the low frequency range of 20 Hz to 1 kHz, whereas in the high frequency range up to 1 MHz permittivity is mainly governed by the molecular polarization and remains almost independent of the frequency. These SiO₂ and Al₂O₃ nanofillers containing PNC films at fixed temperature display anomalous behaviour of dielectric permittivity and ac electrical conductivity with the increase of nanofiller concentration, but these parameters significantly enhance at low frequencies with the increase of temperature of the films. The electric modulus spectra of Al₂O₃ containing PNC film exhibit relaxation peaks below 100 Hz at higher temperatures which attribute to the interfacial polarization relaxation process. The frequency independent dielectric permittivity and significantly low loss of these PNC materials at radio frequencies confirm their suitability as polymeric nanodielectric (PND) substrate and insulator in the design and fabrication of biodegradable electronic devices and electrical components.

中文翻译：

---

非晶态PVP-SiO2和PVP-Al2O3聚合物纳米介电膜的介电弥散度和电导率

可生物降解的杂化聚合物纳米复合材料（PNC）膜，其中包含二氧化硅（SiO ₂）和氧化铝（Al ₂ O ₃）纳米颗粒作为无机纳米填料，而聚乙烯吡咯烷酮（PVP）作为有机基质（即PVP– x wt％SiO ₂和PVP- X重量％的Al ₂ ø ₃为X＝ 0、1、3和5）已经通过水溶液浇铸法制备。X射线衍射（XRD）研究表明，这些纳米复合材料是高度非晶态的。这些不同的纳米填料浓度的PNC膜的介电谱已在固定温度下于20 Hz至1 MHz的频率范围内进行，并且还针对3 wt％的含有PNC膜的纳米填料随温度变化进行了测定。结果证实，在20 Hz至1 kHz的低频范围内，这些杂化膜的复介电常数受界面极化的影响，而在高达1 MHz的高频范围内，介电常数主要受分子极化的控制，并保持几乎与频率无关。这些SiO ₂和Al ₂ O ₃包含PNC薄膜的纳米填料在固定温度下随纳米填料浓度的增加而表现出介电常数和交流电导率的异常行为，但是这些参数在低频下随薄膜温度的增加而显着提高。含有Al ₂ O ₃的PNC膜的电模量谱在较高温度下显示出低于100 Hz的弛豫峰，这归因于界面极化弛豫过程。这些PNC材料的频率独立介电常数和在射频下的极低损耗，证实了它们在设计和制造可生物降解电子设备和电气组件时，适合作为聚合物纳米介电（PND）衬底和绝缘体。