Posted in | News | Nanomaterials

In-Depth Understanding of Dielectric Breakdown in Nanocomposites

In a study published recently in the journal ACS Nano, researchers detail the dielectric breakdown behavior in nano-dielectric materials when influenced by organic-inorganic interfaces, showing the impact of nanoparticle concentration and distribution on dielectric characteristics.  

In-Depth Understanding of Dielectric Breakdown in Nanocomposites

Study: Multiscale Characterization of the Influence of the Organic–Inorganic Interface on the Dielectric Breakdown of Nanocomposites. Image Credit: Kateryna Kon/Shutterstock.com

Benefits of Dielectrics

Growing energy needs and the requirement for better energy storage systems require the design of high-performance insulators with high power and energy concentrations, large dielectric energies, and ease of processing.

 Dielectric capacitors are suited for high-voltage electrical power systems and modern electronic equipment. Because of their quick charging or discharging, they have a higher energy density when compared to alternative storage approaches.

 The total energy concentration in the battery is therefore determined by the material's relative dielectric permittivity and is finally restricted by the dielectric breakdown strength of the film.

Ceramic dielectrics are widely utilized dielectric substances; however, they have a low dielectric failure toughness and poor degradability. Polymers, on the other hand, have a relatively low dielectric property but are versatile and readily processed materials with a high dielectric failure toughness. 

The goal of nanostructured materials is to blend both these features to generate materials with improved functionality.

Importance of Organic-Inorganic Interface

The interfacial design of these materials frequently emphasizes such enhancements since the characteristics of the substance in nanoparticles cannot simply be seen as the summation of the properties of its elements. The improved operating resilience against dielectric breakdown in nanomaterials demonstrates the interface's critical role in shaping the final characteristics of the nanocomposite.

Determining the precise relationship between nanoscale surfaces and the material's overall macroscopic characteristics remains a challenging issue. The production of high-performance dielectrics is aided by accurately regulating the surface characteristics.

When nanoparticles (NPs) are mixed with a polymer matrix, they form a wide contact area that is extremely polar in nature and may condense a vast number of charge carriers per volume.

 Ceramic nanomaterials placed in a polymer matrix may significantly improve the composite's relative dielectric permittivity. Nevertheless, due to a mismatch in the comparative dielectric properties of the nanoparticles and the polymer matrices, the electric field spreads non-homogeneously over the surface and focuses centrally in the polymer matrix, resulting in a significant reduction in corrosion rate.

Attempts to solve this challenge have mostly centered on interfacial technology via surface alterations and the usage of core-shell composites.

Various Methods to Improve Dielectric Efficiency

Using metallic nanoparticles distributed in a polymer matrix may help improve the dielectric efficiency of nanomaterials. Under an applied electric field, such nanoparticles are predicted to be polarised, filtering the electric field and exhibiting potentially infinite relative dielectric permittivity. Indeed, enormous relative dielectric permittivity rates for nanoparticles, including conductive polymers, have been recorded.

The conductive nanomaterials act as embedding conductors enclosed by a polymer dielectric, culminating in an arrangement of linked "nano capacitors" within the nanocomposite. This results in a significant increase in relative dielectric permittivity. Similar to grain-boundary barrier layer ceramic capacitors, polarisation of the dielectric between the nanoparticles enhances the visible relative dielectric permittivity.

Raising the filler loading to the saturation point, on the other hand, leads to the establishment of a conductive route along with the nanoparticles link. Consequently, a drastic loss of dielectric properties occurs. 

Concluding Remarks

In this study, a complete breakdown of the processes of charge storage and dielectric properties in nanocomposites was presented by integrating studies on samples covering three orders of magnitude in size scale. Using gold nanoparticles on SAMs, it was shown how the chemical composition of the interaction affects its capacity to hold charges. DFT simulations indicated a geometrical modification that allowed considerable charge storage at the -NH2/Au interface, highlighted by the predicted charge density movement at that particular conjunction link.

The influence of these organic/inorganic interactions on the entire material characteristics was demonstrated by utilizing metallic nanoparticles as fillers in polymer matrices tens to hundreds of nanometres thick. While having no effect on dielectric characteristics at this microscopic scale, the inclusion of these inorganic fillers caused a considerable increase in corrosion rate in macroscopic level samples.

The findings of this study shed light on the influence and significance of the contact between an inorganic nanoparticle and an organic molecule on dielectric breakdown behavior. The results give insight into the unusual charge storage process that occurs at the organic/inorganic border, emphasizing its molecular specificity. The ultimate effect on the object's breakdown behavior turns out to be heavily influenced by system morphologies and nanoparticle loading, preferring distinct electron transport domains. 

Reference

Pieters, P. F., Lainé, A. et al. (2022). Multiscale Characterization of the Influence of the Organic−Inorganic Interface on the Dielectric Breakdown of Nanocomposites. ACS Nano. Available at: https://pubs.acs.org/doi/full/10.1021/acsnano.2c01558

Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

Shaheer Rehan

Written by

Shaheer Rehan

Shaheer is a graduate of Aerospace Engineering from the Institute of Space Technology, Islamabad. He has carried out research on a wide range of subjects including Aerospace Instruments and Sensors, Computational Dynamics, Aerospace Structures and Materials, Optimization Techniques, Robotics, and Clean Energy. He has been working as a freelance consultant in Aerospace Engineering for the past year. Technical Writing has always been a strong suit of Shaheer's. He has excelled at whatever he has attempted, from winning accolades on the international stage in match competitions to winning local writing competitions. Shaheer loves cars. From following Formula 1 and reading up on automotive journalism to racing in go-karts himself, his life revolves around cars. He is passionate about his sports and makes sure to always spare time for them. Squash, football, cricket, tennis, and racing are the hobbies he loves to spend his time in.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Rehan, Shaheer. (2022, April 12). In-Depth Understanding of Dielectric Breakdown in Nanocomposites. AZoNano. Retrieved on July 02, 2022 from https://www.azonano.com/news.aspx?newsID=38972.

  • MLA

    Rehan, Shaheer. "In-Depth Understanding of Dielectric Breakdown in Nanocomposites". AZoNano. 02 July 2022. <https://www.azonano.com/news.aspx?newsID=38972>.

  • Chicago

    Rehan, Shaheer. "In-Depth Understanding of Dielectric Breakdown in Nanocomposites". AZoNano. https://www.azonano.com/news.aspx?newsID=38972. (accessed July 02, 2022).

  • Harvard

    Rehan, Shaheer. 2022. In-Depth Understanding of Dielectric Breakdown in Nanocomposites. AZoNano, viewed 02 July 2022, https://www.azonano.com/news.aspx?newsID=38972.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit