Space Charge at Nanoscale: Probing Injection and Dynamic Phenomena Under Dark/Light Configurations by Using KPFM and C-AFM

Villeneuve-Faure, Christina; Boudou, Laurent; Teyssèdre, G.

doi:10.1007/978-3-030-15612-1_9

Cited by 3 publications

(9 citation statements)

References 114 publications

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“…The purpose of the KPFM-AM feedback loop is to adjust the applied compensation dc voltage (V dc ) so that it is equal to the contact surface potential difference (ΔV SP1 ) between the tip and the sample. 22 Therefore the force at frequency ω is zero and the amplitude of the cantilever is zero. This means that the surface potential distribution of the sample can be obtained by detecting the compensation potential V dc when the cantilever amplitude is zero.…”

Section: Methodsmentioning

confidence: 99%

“…The probe and the sample were connected through a common ground, and a contact potential difference was generated between the two. The purpose of the KPFM-AM feedback loop is to adjust the applied compensation dc voltage ( V dc ) so that it is equal to the contact surface potential difference (Δ V SP1 ) between the tip and the sample . Therefore the force at frequency ω is zero and the amplitude of the cantilever is zero.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites

Chen

Zhou

et al. 2022

ACS Appl. Nano Mater.

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Polymer-based dielectric composites with inorganic oxide fillers could exhibit synergistic physical and chemical characteristics from both advantages, which have flexible applications in electrical and electronic technology. As composites with various substances, the interfacial structure plays a key role in the electric and dielectric properties. In this work, BaTiO3 particles were embedded in polyvinylidene fluoride (PVDF) by a solution crystallization process. The conductivity and dielectric constant of the composites increased with the increase of the BaTiO3 filler contents. The charge injection and dissipation behavior at the nanointerface of the composite is investigated by Kelvin probe force microscopy. It is found that the charges are more easily injected into the nanointerface between the particle and the polymer. The accumulation and dissipation of surface charges obey the exponential law. The space-charge polarization is also suggested to be a key factor of injection, while the charge dissipation is determined by charge tunneling. The result also demonstrates that the strong interfacial polarization between the BaTiO3 particles and the PVDF matrix plays a crucial role in the dielectric properties. This work provides significant insights into understanding the interfacial charge transport in dielectric composites.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites

Chen

Zhou

et al. 2022

ACS Appl. Nano Mater.

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“…While these can be difficult to evaluate quantitatively due to the complicated surface contributions, KPFM is used for evaluating electrostatic-related surface charge distribution and potential electrical conductivity of interacting fibers . Generally, surface potential corresponds to the work function of a material or the energy required to extract an electron from the material’s fundamental state or for insulative materials the charge distribution . Here, we focus on the general correlations between electrostatic potential and spatial distribution differences between the LT, LT-NH, and LT-CF fibers with measurements for the fibers’ electrostatic surface potentials directly derived from KPFM included in Table , column 4.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Surprisingly, the electrostatic surface potential of LT-NH fiber does not change significantly. These differences can be attributed to the different nature and different concentrations of charged surface groups of different polarities, trapped charges, and charge cancellations, but more KPFM measurements should be carefully analyzed for finding properties correlations …”

Section: Results and Discussionmentioning

confidence: 99%

“…24 Generally, surface potential corresponds to the work function of a material or the energy required to extract an electron from the material's fundamental state or for insulative materials the charge distribution. 48 Here, we focus on the general correlations between electrostatic potential and spatial distribution differences between the LT, LT-NH, and LT-CF fibers with measurements for the fibers' electrostatic surface potentials directly derived from KPFM included in Table 2, column 4. As an example, we show KPFM images of the pristine LT fiber surface and the same fiber after NH and CF treatments (Figure 8).…”

Section: Surface Adhesion and Energy Dissipationmentioning

confidence: 99%

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Carbon Fiber Surface Functional Landscapes: Nanoscale Topography and Property Distribution

Adstedt

Stojcevski

Newman

et al. 2022

ACS Appl. Mater. Interfaces

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The ultimate properties of carbon fibers and their composites are largely dictated by the surface topography of the fibers and the interface characteristics, which are primarily influenced by the surface distribution of chemical functionalities and their interactions with the matrix resin. Nevertheless, nanoscale insights on the carbon fiber surface in relationship with its chemical modification are still rarely addressed. Here, we demonstrate a critical insight on the nanoscale surface topography characterization of modified novel carbon fibers using high-resolution atomic force microscopy at multiple length scales. We compare the nanoscale surface characteristics relevant to their role in controlling interfacial interactions for carbon fibers manufactured at two different tensions and two distinct chemically functionalized coatings. We used surface dimple (also known as nanopores) profiling, microroughness analysis, power spectral density analysis, and adhesion and electrostatic potential mapping to reveal the fine details of surface characteristics at different length scales. This analysis demonstrates that the carbon fibers processed at lower tension possess a higher fractal dimension with a more corrugated surface and higher surface roughness, which leads to increased surface adhesion and energy dissipation across nano- and microscales. Furthermore, electrochemical surface modification with amine- and fluoro-functional groups significantly masks the microroughness inherent to these fibers. This results in increased fractal dimension and decreased energy dissipation and adhesion due to the high chemical reactivity in the areas of asperities and surface defects combined with a significant increase in the surface potential, as revealed by Kelvin probe mapping. These local surface properties of carbon fibers are crucial for designing next-generation fiber composites with predictable interfacial strength and the overall mechanical performance by considering the fiber surface topography for proper control of interphase formation.

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Achieving high microscale photoconductivity in Gd-modified bismuth ferrite via modulating ferroelectric polarization

Mana-ay,

Chen,

Chien

et al. 2024

J. Mater. Chem. C

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Space Charge at Nanoscale: Probing Injection and Dynamic Phenomena Under Dark/Light Configurations by Using KPFM and C-AFM

Cited by 3 publications

References 114 publications

Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites

Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites

Carbon Fiber Surface Functional Landscapes: Nanoscale Topography and Property Distribution

Achieving high microscale photoconductivity in Gd-modified bismuth ferrite via modulating ferroelectric polarization

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Space Charge at Nanoscale: Probing Injection and Dynamic Phenomena Under Dark/Light Configurations by Using KPFM and C-AFM

Cited by 3 publications

References 114 publications

Nanoscale Detection of Interfacial Charge Mobility in BaTiO3/Polyvinylidene Fluoride Nanocomposites

Nanoscale Detection of Interfacial Charge Mobility in BaTiO3/Polyvinylidene Fluoride Nanocomposites

Carbon Fiber Surface Functional Landscapes: Nanoscale Topography and Property Distribution

Achieving high microscale photoconductivity in Gd-modified bismuth ferrite via modulating ferroelectric polarization

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Product

Resources

About

Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites

Nanoscale Detection of Interfacial Charge Mobility in BaTiO₃/Polyvinylidene Fluoride Nanocomposites