Local dielectric spectroscopy of nanocomposite materials interfaces

Labardi, M.; Prevosto, D.; Nguyen, Hung K.; Capaccioli, S.; Lucchesi, M.; Rolla, Pierangelo

doi:10.1116/1.3368597

Cited by 41 publications

(63 citation statements)

References 29 publications

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“…An external voltage V = V DC + V AC sin( ωt ) was applied to the probe to excite an electrostatic interaction, which will influence the vibration state of the probe, such as amplitude, frequency and phase. In this study, the 2 ω phase shift signal Δ ϕ (2 ω ) is detected to avoid the impact of the work function difference between the probe and sample (Supplementary Note 2) and obtain the electrostatic force gradients1314, which is related to the capacitance between the probe and the sample. Figure 1c shows the TEM image of LDPE/TiO 2 nanocomposite and we find the diameter of the TiO 2 nanoparticle is about 100 nm.…”

Section: Resultsmentioning

confidence: 99%

“…EFM is a technique based on the accurate detection of electrostatic interaction between a scanning probe and a sample surface at the level of nanoscale891011. With the ultra-high precision and nanometer detection resolution of EFM12, even very small local electrostatic interaction can be detected, which may reflect the local dielectric property of the material1314.…”

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confidence: 99%

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Local Dielectric Property Detection of the Interface between Nanoparticle and Polymer in Nanocomposite Dielectrics

Peng

Zeng

Yang

et al. 2016

Sci Rep

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The interface between nanoparticles and polymer matrix is considered to have an important effect on the properties of nanocomposites. In this experimental study, electrostatic force microscopy (EFM) is used to study the local dielectric property of the interface of low density polyethylene (LDPE)/TiO2 nanocomposites at nanometer scale. The results show that the addition of TiO2 nanoparticles leads to a decrease in local permittivity. We then carry out the finite element simulation and confirm that the decrease of local permittivity is related to the effect of interface. According to the results, we propose several models and validate the dielectric effect and range effect of interface. Through the analysis of DSC and solid-state NMR results, we find TiO2 nanoparticles can suppress the mobility of local chain segments in the interface, which influences the dipolar polarization of chain segments in the interface and eventually results in a decrease in local permittivity. It is believed the results would provide important hint to the research of the interface in future research.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Local Dielectric Property Detection of the Interface between Nanoparticle and Polymer in Nanocomposite Dielectrics

Peng

Zeng

Yang

et al. 2016

Sci Rep

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“…This was carried out in recent investigations of confinement and interfacial effects on polymer dynamics. 4,14,15,22,23 In the following, we present an extended analytical model for EFM tip/sample/substrate interaction with a wider range of applicability than previously adopted models.…”

Section: General Groundsmentioning

confidence: 99%

Extended model for the interaction of dielectric thin films with an electrostatic force microscope probe

Labardi¹,

Barsotti

Prevosto³

et al. 2015

Journal of Applied Physics

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To improve measurements of the dielectric permittivity of nanometric portions by means of Local Dielectric Spectroscopy (LDS), we introduce an extension to current analytical models for the interpretation of the interaction between the probe tip of an electrostatic force microscope (EFM) and a thin dielectric film covering a conducting substrate. Using the proposed models, we show how more accurate values for the dielectric constant can be obtained from single-frequency measurements at various probe/substrate distances, not limited to a few tip radii

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“…By using various scanning modes of SPM, including EFM mode, some researchers studied various characteristics and rules of dielectric parameters of nanoparticles in nano-dielectric, including local dielectric spectroscopy, charging response and polarization properties. Labardi used EFM to detect the local dielectric constant around nanoparticles in nano dielectric [13]. Borgani applied charge and discharge processing in LDPE/Al 2 O 3 and characterized the trap energy level on Al 2 O 3 nanoparticles by EFM [14].…”

Section: Introductionmentioning

confidence: 99%

Study on Micro Interfacial Charge Motion of Polyethylene Nanocomposite Based on Electrostatic Force Microscope

et al. 2019

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The interface area of nano-dielectric is generally considered to play an important role in improving dielectric properties, especially in suppressing space charge. In order to study the role of interface area on a microscopic scale, the natural charge and injected charge movement and diffusion on the surface of pure LDPE and SiO2/LDPE nanocomposite were observed and studied by gradual discharge under electrostatic force microscope (EFM). It was detected that the charge in SiO2/LDPE nanocomposite moved towards the interface area and was captured, which indicates that the charge was trapped in the interface area and formed a barrier to the further injection of charge and improving the dielectric performance as a result. Moreover, pulsed electro-acoustic (PEA) short-circuited test after charge injection was carried out, and the change of total charge was calculated. The trend of charge decay in the EFM test is also generally consistent with that in PEA short-circuit test and can be used to verify one another. The results revealed the law of charge movement and verified the interface area can inhibit space charge injection in nano-dielectric at the microscale, which provides an experimental reference for relevant theoretical research.

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Local dielectric spectroscopy of nanocomposite materials interfaces

Cited by 41 publications

References 29 publications

Local Dielectric Property Detection of the Interface between Nanoparticle and Polymer in Nanocomposite Dielectrics

Local Dielectric Property Detection of the Interface between Nanoparticle and Polymer in Nanocomposite Dielectrics

Extended model for the interaction of dielectric thin films with an electrostatic force microscope probe

Study on Micro Interfacial Charge Motion of Polyethylene Nanocomposite Based on Electrostatic Force Microscope

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