Charge Dynamics at the Nanoscale

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Theory and Simulation of Nanostructures".

Deadline for manuscript submissions: closed (20 January 2025) | Viewed by 1375

Special Issue Editors


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Guest Editor
School of Electrical and Electronic Engineering, Xi’an Jiaotong University, Xi’an, China
Interests: charge transport in insulation; electrical ageing; partial discharge; polymer insulation
School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: dielectric materials from polymer nanocomposites; Kelvin probe force microscopy and its application

Special Issue Information

Dear Colleagues,

Charge transport, accumulation, and discharge are important phenomena in power, electrical, and related materials. Over the last several decades, the understanding of the charge dynamics of materials has extended from the macroscale to micro-meter scale. Furthermore, this knowledge has greatly improved power, electrical, and electronic applications. However, most of the theories on charge dynamics are discussed in the nanometer scale, such as Schottkey injection, Tunnelling theory, and hopping theory. The discovery of charge dynamics at the microscale is not yet deep enough to improve theories and build a link with the charge dynamics of materials in the nanostructure. On the one hand, we lack experimental tools or methods to exactly detect charge dynamics at the nanoscale. Additionally, we lack valid models and effectively accurate simulation methods to calculate charge dynamics at the nanoscale.

So, this Special Issue aims to call for existing works to reveal charge dynamics in the nanoscale and to improve our understanding of the relationship between charge dynamics at the nanoscale and the nanostructure of the materials. The papers should include, but are not limited to, the following topics:

  1. Nanoscale experimental methods of detecting the charge dynamics in various materials.
  2. Nanoscale charge behavior at the surface or in the bulk of the materials.
  3. Nanomaterials with designed structure or function that can efficiently influence nanoscale charge behavior.
  4. Nanoscale models and simulations of charge dynamics influenced by the nanostructure of materials.

We look forward to receiving your contributions.

Prof. Dr. Zepeng Lv
Dr. Jun Zhou
Guest Editors

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Keywords

  • bulk charge
  • charge transport
  • charge accumulation
  • surface charge
  • discharging
  • nanoscale charge dynamic
  • metal/insulation surface
  • heterojunction

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Published Papers (1 paper)

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Research

11 pages, 4997 KiB  
Article
Electrical Response of Different Crystalline Microregions in Poly(vinylidene fluoride)
by Mengyue Su, Jun Zhou, Yuqing Chen, Yilong Wang, Gan Jin, Haiyang Wang, Jiacheng Zhou, Xiaoyue Pang, Zepeng Lv and Kai Wu
Nanomaterials 2024, 14(19), 1555; https://doi.org/10.3390/nano14191555 - 26 Sep 2024
Viewed by 1090
Abstract
The crystal structure has a great influence on the dielectric and piezoelectric performance of poly(vinylidene fluoride) (PVDF). In this work, we prepared PVDF films with two typical crystalline phases (α and β). In situ Kelvin probe force microscopy (KPFM) and Piezoelectric force microscopy [...] Read more.
The crystal structure has a great influence on the dielectric and piezoelectric performance of poly(vinylidene fluoride) (PVDF). In this work, we prepared PVDF films with two typical crystalline phases (α and β). In situ Kelvin probe force microscopy (KPFM) and Piezoelectric force microscopy (PFM) were employed to investigate the responses of different PVDF crystalline phases to charge mobility, polarization, and piezoelectric properties. We used a homemade Kelvin probe force microscope (KPFM) to inject charges into the two crystalline phases to investigate the differences in the response of different crystalline phases of PVDF to electrical excitation on a microscopic scale. It was found that the α-phase has a lower charge injection barrier and is more susceptible to charge injection and that the α-phase is accompanied by a faster charge dissipation rate, which makes it easier to accumulate charge at the interface between the α-phase and β-phase PVDF. Moreover, the PFM polarization manipulation showed no change in the amplitude and phase diagram of the α-phase under ±10 V bias. In contrast, the β-phase showed a clear polarization reversal phenomenon and a significant increase in piezoelectric amplitude, which is consistent with its polar intrinsic properties. This study provides valuable insights into the multiphase contributions and a reference for designing advanced PVDF dielectrics. Full article
(This article belongs to the Special Issue Charge Dynamics at the Nanoscale)
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