Dielectric Impedance Spectroscopy Research Articles

Towards Easy-to-Use Bacteria Sensing: Modeling and Simulation of a New Environmental Impedimetric Biosensor in Fluids.

Conventional pathogenic bacteria-detection methods are lab-bound, time-consuming and need trained personnel. Microelectrodes can be used to recognize harmful microorganisms by dielectric impedance spectroscopy. However, crucial for this spectroscopy method are the spatial dimensions and layout of the electrodes, as the corresponding distribution of the electric field defines the sensor system parameters such as sensitivity, SNR, and dynamic range. Therefore, a variety of sensor models are created and evaluated. FEM simulations in 2D and 3D are conducted for this impedimetric sensor. The authors tested differently shaped structures, verified the linear influence of the excitation amplitude and developed a mathematical concept for a quality factor that practically allows us to distinguish arbitrary sensor designs and layouts. The effect of guard electrodes blocking outer influences on the electric field are investigated, and essential configurations are explored. The results lead to optimized electronic sensors in terms of geometrical dimensions. Possible material choices for real sensors as well as design and layout recommendations are presented.

Ionic liquid crystals: Synthesis and characterization via NMR, DSC, POM, X-ray diffraction and ionic conductivity of asymmetric viologen bistriflimide salts

A series of asymmetric viologen bistriflimide salts of both short and long alkyl chains were synthesized by the metathesis reaction of lithium triflimide salt with the respective asymmetric viologen dibromide salts in methanol. Their thermotropic liquid crystalline properties were determined by differential scanning calorimetry, polarizing optical microscopy and variable temperature X-ray diffraction techniques. These salts melt into highly-ordered smectic T phases that is, crystal-to SmT transitions (Tms) at relatively low temperatures (lowest Tm at −12 °C) and maintain liquid crystallinity in a wide range of temperatures (8–132 °C), with excellent thermal stabilities up to 320 °C as determined by thermogravimetric analysis. These results differ with respect to the symmetric viologen bistriflimide salts. Ionic conductivity of these salts was also measured by dielectric impedance spectroscopy and found to be in the 10−2.5 S cm−1 range, highlighting their potential as electrolytes at room temperature.

The parasitic effects in high-frequency dielectric spectroscopy of liquid crystals – the review

ABSTRACT Dielectric (impedance) spectroscopy of liquid crystals is a powerful experimental technique. It is especially essential because liquid crystals in many applications are still controlled by the electric field. In this paper, the problems with the high frequency (>1 MHz) measurements in classical (in the shape of the flat capacitor) measuring cells are discussed. The procedure for overcoming measurement difficulties was presented and applied to the dielectric response of antiferroelectric, binary mixture. Additionally, the paper presents the first example of extending the measuring range of dielectric spectroscopy from 1 MHz to ~50 MHz by overcoming the parasitic effect related to resonance in measuring setup.

Non-destructive quality monitoring of 3D printed tissue scaffolds via dielectric impedance spectroscopy and supervised machine learning

Majority of methods currently used for quality assessment of tissue engineered medical products (TEMPs) are offline and destructive in nature, which is one of the factors impeding the scale up and translation of these technologies. In this study, we investigate quality assessment of TEMP via dielectric impedance spectroscopy (DIS) and supervised machine learning (ML) as a non-destructive alternative that requires minimal human intervention. 3D printed, NaOH-treated polycaprolactone (PCL) scaffolds seeded with human adipose-derived stem cells (hASC), NIH 3T3, MG63, and human chondrocyte cells were assessed via DIS over 4 days of in vitro culture. The results showed that the cell type and duration in culture had a significant effect on the delta permittivity (Δε, an important DIS metric. Five supervised ML algorithms – K Nearest Neighbors (KNN), Logistic Regression, Random Forest Classifiers, Support Vector Machines, and artificial neural network – were then used to analyze the comprehensive structured permittivity datasets to determine their ability to discern between different cell types and culture durations. The KNN algorithm demonstrated the best accuracy (99%). The outcomes of this study demonstrate the approach of using DIS and supervised ML in conjunction for assessment of TEMPs in an automated manufacturing system.

Study of anneal-tuned dielectric properties, AC conductivity, complex impedance, and modulus of cobalt ferrite nanoparticles

The frequency-dependent electrical behavior of CoFe2O4 nanoparticles prepared using the chemical co-precipitation technique is investigated. The crystallite size of as-prepared particles was found to be 14.11 nm which increased to 20.32 nm, 23.78 nm, and 34.69 nm on annealing at 573 K, 773 K, and 973 K respectively. The influence of annealing temperature on electrical properties is analyzed using dielectric response, impedance spectroscopy and modulus spectroscopy in the range 1 kHz to 1 MHz. A strong dependence of electrical properties on structural parameters is observed. The real part of the dielectric constant lied in the range of 1.54–3.12, the imaginary part of the dielectric constant varied from 0.06 to 0.41, and the value of dielectric loss varied from 0.04 to 0.13 at 1 MHz for different annealing temperature. All the samples possess excellent insulating properties. Annealing CoFe2O4 nanoparticles yield ferrites with an ultra-low dielectric constant, reduced dielectric loss with high resistivity at high frequencies making them suitable in high-frequency applications.

Structural, morphological, dielectric and optical properties of double perovskites RBaFeTiO6 (R = La, Eu).

Double perovskites RBaFeTiO6 (R = La, Eu) were successfully synthesized using a solid state reaction route. Structural refinement analysis has been performed to investigate the details of the crystalline structure which was found to be a cubic double perovskite structure at room temperature (space group Pm3̄m, No. 221). Crystallite size, lattice strain, density, and porosity parameters were also calculated. The morphology and the elemental composition were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and elemental mapping. FTIR and Raman scattering spectroscopy have been performed in order to study the vibrational modes and the various bond formations of the synthesized samples. The optical properties investigated by means of the optical absorbance measurements highlight that both materials present large band gap energies, and are thus potential candidates for various technological applications. The electrical behavior of these double perovskites was also studied by frequency-dependent dielectric measurements and impedance spectroscopy. The electrical conduction follows Jonscher's power law and the conduction mechanisms are identified.

Impact of Cr Substitution on Structural, Magnetic, Electric and Impedance Study of Mn-Ni-Zn Ferrites

A series of Cr3+-substituted Mn-Ni–Zn ferrites; Mn0.5Ni0.1Zn0.4Fe2-xCrxO4 (x = 0.0 - 0.4 in a step of 0.1) were prepared by traditional solid-state reaction route. The structural, magnetic, dielectric properties and impedance spectroscopy of these compositions were studied. Phase identification and lattice constant (a0) determination were carried out by X-ray diffraction (XRD). The XRD patterns established the fabrication of a single-phase spinel structure. The FESEM micrographs exposed that the average grain size () increased slightly with chromium (Cr) substitution and then decreased for a higher concentration of chromium in the composition. The real part of initial permeability () diminished owing to the enhanced porosity of the compositions with the increase of Cr3+ content in the composition. The highest relative quality factor (RQF) was attained for the samples with x = 0.1. The magnetic hysteresis was investigated to know the effect of Cr3+ substitution in the composition of the magnetic properties. The decrease of saturation magnetization (Ms) with an enhancement in Cr3+ might be triggered by switching of Fe3+ ions from octahedral to tetrahedral site. The samples with x = 0.1 exhibited the highest anisotropy constant (K). Curie temperatures of the investigated samples were significantly modified to lower temperatures with the Cr3+ content. The frequency characteristics of dielectric properties and impedance spectroscopy had been investigated. The highest dielectric constant (ε') and resistivity were observed for x = 0.1 and x = 0.2 samples. The complex impedance spectra analysis reveals in-depth information about the conduction mechanism, microstructure, and orientation of the grains in the samples.

Electro-mechanical properties of thermoplastic polyurethane films and tubes modified by hybrid carbon nanostructures for pressure sensing

Electrical and piezoresistive properties of hybrid nanocomposite films and tubes made of a segmented aliphatic polyurethane modified with multilayer graphene sheets (MLGSs), multiwall carbon nanotubes (MWCNTs), and hybrid mixtures of both, were investigated. Hybrid nanocomposites were fabricated at a total weight concentration () of 5 wt.%, with relative weight concentration of MLGSs with respect to MWCNTs ( of 25%, 50% and 75%. The electrical conductivity of these films is dominated by the MWCNT network, observing electrical MLGS-MWCNT collaborative effects only for = 25%. Dielectric impedance spectroscopy indicates that the nanocomposites display capacitive effects at frequencies higher than tens of Hz, which is explained by interfacial polarization. The burst pressure and circumferential stiffness of internally pressurized tubes fabricated from these films is slightly higher for tubes containing only MWCNTs. The strain fields in the pressurized tubes, determined by digital image correlation, showed localized strain gradients, and the piezoresistive response of the electro-conductive tubes was nonlinear. The highest pressure sensitivity factor (4.59 kPa−1) was obtained for hybrid nanocomposite tubes with = 25%.

Dielectric properties of nucleated erythrocytes as simulated by the double spherical-shell model* *Project supported by the National Natural Science Foundation of China (Grant Nos. 51277099 and 52007087), the Natural Science Foundation of Zhejiang Province, China (Grant Nos. LY20C110001 and LSY19A010002), the Natural Science Foundation of Ningbo City, China (Grant Nos. 2019A610349 and 202003N4116), the Fund from the Educational Commission of

The dielectric properties of nucleated erythrocytes from bullfrogs were measured in a frequency range of 10 kHz–110 MHz. The complex permittivity (ε *), complex conductivity (κ *), and complex resistivity (ρ *) were analyzed and compared in the 10.63% to 37.58% haematocrit (Hct) range. The relaxation behavior, the passive electrical properties, and the cellular structure parameters, including the cell membrane, the cytoplasm, the nuclear membrane, and the nucleoplasm of the nucleated erythrocyte suspensions were investigated. The method used is based on the binomial Cole–Cole equation and the double spherical-shell physical models. Upon the elimination of the electrode polarization effect, two definite relaxations related to the interfacial polarization are observed on low- and high-frequency dispersions. The permittivity values and the characteristic frequency values differ by one order of magnitude: the low-frequency relaxation increments [Δ ε 1 = (5.63 ± 1.43)× 103] and the characteristic frequency [f c1 = (297.06 ± 14.48) kHz] derived from the cell membrane, the high-frequency relaxation increments [Δ ε 2 = (5.21 ± 1.20) × 102] and the characteristic frequency [f c2 = (3.73 ± 0.06) MHz] derived from the dielectric response to the external electric field of the nuclear membrane, respectively. Moreover, the other core dielectric parameters, such as the relative permittivity of the cell membrane [ε m = (7.57 ± 0.38)] and the nuclear envelope [ε ne = (23.59 ± 4.39)], the conductivity of the cytoplasm (hemoglobin, κ Hb = (0.50 ± 0.13) S/m] and the nuclear endoplasm [κ np = (2.56 ± 0.75) S/m], and the capacitance of the bilayer membranes [C m: (0.84 ± 0.04) μF/cm2], and C ne: (0.52 ± 0.10) μF/cm2] were also accurately and reliably measured. This work presents a feasible method to evaluate the dielectric parameters and the cellular structure of the erythrocytes of bullfrogs. Moreover, it paves the way for new studies on the haematology of frogs and the detection of nucleated cells via dielectric impedance spectroscopy.

Structural, Microstructural, Electrical, and Magnetic Properties of CuFe2-(x+y)EuxScyO4 (where x and y vary from 0 to 0.03) Nanoparticles

In the present work, the CuFe2-(x+y)EuxScyO4 nanoparticles were prepared by solution combustion method for reporting the structural, microstructural, dielectric, and magnetic properties of prepared samples. The XRD (X-ray diffractometer) patterns confirm the spinel cubic structure with space group Fd3m. The average crystallite size was found in the range from 25 to 10 nm for x = y = 0.00, 0.01, 0.02, and 0.03 concentrations. The SEM (scanning electron microscopy) investigations indicate the porous nature and particle agglomeration. The elemental composition of the samples was studied by using energy-dispersive X-ray spectroscopy (EDS). The FTIR (Fourier transform-infrared spectroscopy) investigation shows the two absorption bands around 554.07 cm−1 and 468.98 cm−1 due to stretching vibrations of the Cu⟺O metal-oxygen bond at the A-site and stretching vibrations of Fe⟺O metal-oxygen bond at the B-site, respectively. The real and imaginary parts of dielectric constant, dielectric loss tangent, AC conductivity, and impedance spectroscopy have been recorded by the methods of impedance analyzer from the range 0.1 KHz to 1 MHz. The dielectric constant and dielectric loss show maximum value at smaller frequency region and are decreases with increase in frequency. AC conductivity increases with the increase of frequency. The real and imaginary part of impedance spectra as function of frequency was studied. The Cole-Cole plots drawn from the impedance spectra show one semicircle for each of the samples. The magnetic hysteresis loop reveals the soft ferromagnetic nature. The magnetic parameters such as saturation magnetization, coercivity, and remanence magnetization decrease with the increase of Eu3+ and Sc3+ concentration.

Pyroelectric energy harvesting for dye decolorization using Ba0.9Ca0.1TiO3 ceramics

Ba0.9Ca0.1TiO3 (BCT) ceramic was prepared via a mixed-oxide route. Its microstructural characterization was done using x-ray diffraction, Raman spectrum, and scanning electron microscopy. Furthermore, its electrical properties were studied using dielectric measurement and impedance spectroscopy. BCT was also examined for the pyroelectric effect with the pyroelectric coefficient of ∼2.4 × 10−4 C/m2 K. An open circuit voltage was obtained during a temporal temperature change on BCT. Methylene blue dye degradation was recorded due to pyrocatalytic reactions in 120 heating/cooling cycles. The results show that pyrocatalysis could be an effective solution for the utilization of pyroelectric energy for water cleaning applications.

Dielectric properties, complex impedance analysis and electrical properties of novel particulate composites of NBT-SrFe12O19

The proposed article describes the use of dielectric and complex impedance spectroscopy to evaluate various parameters such as electrical conductivity, activation energy, grain-grain boundary parameters, etc., of the (1−x)Na0.5Bi0.5TiO3–(x)SrFe12O19; (x = 0.5, 0.8 and 1) novel composite system formed with the help of solid-state reaction method. The composite samples have been achieved with modified and enhanced dielectric and electrical properties as compared to the pure ferroelectric and hexaferrite phase before making their composites. Both the regions of low dielectric constant and higher dielectric constant reveal the presence of Maxwell–Wagner polarization. The distribution relaxation time, Cole–Cole plot, and comparison of Modulus and impedance plot disclose the presence of space charge polarization and constant phase element justifying the semiconductor behavior of the samples. The overlapped normalized impedance curve on a single master curve confirmed the presence of relaxation phenomena in the samples and revealed that the samples follow a single relaxation phenomenon at all the temperatures. Jonscher’s power law has been used to find different models of conduction.

Effect of Mn-substitution on impedance spectroscopy and magnetic properties of Al-doped ZnO nanoparticles

In this study, the role of Mn-substitution on the structural, morphological, dielectric, and magnetic properties of Al-doped ZnO nanoparticles has been examined, using XRD, FE-SEM, μAutolab/FRA2 impedance spectroscopy, and vibrating sample magnetometer (VSM) techniques. Structural investigations revealed diffraction peaks consistent with JCPDS card No. 036–1451. Morphological evaluations of the synthesized nanoparticles indicated that the shape of the nanoparticles is a slightly hexagonal and generally spherical structure with a size range of approximately 10–70 nm. Dielectric measurements were performed in frequency ranges between 10−3 Hz and 1 MHz. The results show that the sample's dielectric behavior is affected both by crystallite size and doping material type. In addition, it can be observed that the dielectric parameters exhibit extreme frequency dependence. Mn-substituted Al-doped ZnO is a suitable candidate for high-frequency applications due to its low dielectric loss at high frequencies. The AC conductivity of the Mn-substituted Al-doped ZnO sample increases with each frequency increment, and its value is higher than for the Al-doped ZnO sample, makings it a desirable material for use in device applications. Magnetic calculations, extracted from dielectric impedance spectroscopy measurements, are also investigated. Complex magnetic permeability, together with magnetic loss curves, are also plotted. Finallly, a study of the magnetic properties of the sample, using VSM, showed room-temperature ferromagnetic behavior.

Crystal structure refinement, optical properties, dielectric response, and impedance spectroscopy of Ni2+-Co2+ substituted bismuth copper titanate (BCTO)

We have synthesized single phase Ni+2-Co+2 substituted bismuth copper titanate (Bi2/3Cu3Ti4O12) electroceramic using the sol-gel autocombustion method. The XRD patterns reveal that the prepared BCTO electroceramic are of single phase without the presence of any other phases such as CuO or TiO2. FESEM micrographs show particles with well-defined cubic shape of bismuth copper titanate ceramics. EDX spectra shows all the chemical elements of the prepared composition, this confirm the stoichiometry and the purity of the synthesized electroceramic. The optical band gap study was carried out using UV–Vis–NIR spectroscopy in the region 225–1000 nm and the highest value of 3.63 eV was observed in the sample having x = 0.1. The dielectric response and impedance spectroscopy of the electroceramic were discussed based on Debye-type relaxation process and Maxwell-Wagner model. The sample having x = 0.0 shows the highest dielectric constant (3800) at room-temperature and a frequency of 42 Hz as compared to x = 0.1 and x = 0.2. The Cole-Cole plots of complex impedance and complex electric modulus indicate that grain-boundary resistance is the major contributor to the dielectric response of the prepared BCTO electroceramic.

Structural, electrical and magnetic properties of Ni0.5Cu0.2Cd0.3LaxFe2-xO4 nano-ferrites due to lanthanum doping in the place of trivalent iron

By means of the sol-gel auto combustion technique, the mixed spinel Ni0.5Cu0.2Cd0.3LaxFe2-xO4 nano-ferrites have been synthesized. Crystallite sizes of the ferrite samples have been calculated from the XRD data, and particle sizes from TEM, and FESEM images. SAED pattern confirms the rings due to Miller indices of ferrites. EDS spectrum confirms the presence of all the stoichiometric elements. FT-IR spectra have detected two major absorption bands. Using the measured intrinsic magnetization by VSM, the M-H curve has been recorded. Dielectric parameters, electric modulus, impedance spectroscopy, and ac conductivity have been recorded by means of impedance analyzer from the range 20 Hz-15MHz. The complex modulus spectrum has been analyzed to understand the dynamics of the conduction process. From the Cole-Cole plot drawn from impedance spectra, the value of (Rgb) and (Rg) has been calculated. With the rise of frequency, an increase of ac conductivity for grain and grain boundary distinction has been observed.

Dielectric dispersion and impedance spectroscopy of NiO doped Li2SO4–MgO–P2O5 glass system

Li2SO4–MgO–P2O5 glasses mixed with a varied quantity of NiO were prepared. Detailed spectroscopic investigations (viz., OA, IR and Raman) spectra were carried out. Optical absorption spectral results indicated that Ni2+ ions in the glass network reside in octahedral (Oh) as well as tetrahedral (Td) sites; these results have also pointed out the growing concentration of Ni2+ ions in Oh sites as NiO concentration is increased up to 0.8 mol%. Results of infrared and Raman spectral studies indicated increased internal chaos in the sulpho-phosphate glass network with an increase of NiO concentration up to 0.8 mol%. Values of dielectric permittivity (both real and imaginary components), a.c. conductivity, σac, are observed to be gradually increasing with NiO content in the concentration range 0–0.8 mol%. Electric moduli spectra have exhibited dipolar relaxation effects and the dipolar relaxation time τ estimated from these spectra exhibited a decreasing trend with the raise of NiO quantity up to 0.8 mol%. The complexes of octahedral Ni2+ ions with oxygen ions are predicted to be the possible dipoles responsible for the dipolar effects. Variation of σac with NiO content exhibited an increasing trend up to 0.8 mol%. Quantitative analysis of this observation indicated ionic contribution to σac is dominant in the glasses containing small quantities of NiO (< 0.8 mol%), whereas in the glasses containing higher quantities of NiO (> 0.8 mol%) polaronic contribution to the conductivity seems to be present. Overall, the results of dielectric properties of studied glass system indicted that the glass with low quantities of NiO (< 0.8 mol%) can be considered as useful material as electrolytes in the solid-state batteries.

Ferroelectric, dielectric, and impedance properties of Sm-modified Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics

To investigate the effect of Sm doping on the electrical properties of Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (BZT-xBCT) (x = 40, 50, 60) ceramics, three Sm-modified ceramics were prepared using the conventional solid-state reaction method. Related electrical measurements, including ferroelectric and dielectric investigations and impedance spectroscopy, were recorded for these ceramics. It was found that a tilted morphotropic phase boundary resulted from the addition of Sm, which induced the best piezoelectric properties and insulating behaviour in the Sm-BZT-60BCT sample. An abnormal P-E loop shrinkage appeared in the Sm-BZT-50BCT sample but not in the other two samples. This could be attributable to the different electronegativities between Ca2+ and Ba2+ and between Zr4+ and Ti4+, whose contents are different in varied samples and have an effect on defect-dipole alignment as well as spontaneous polarization. The activation energies for the bulk conductivity in the three composites were calculated to be 0.28 ± 0.01, 0.08 ± 0.01, and 0.36 ± 0.01 eV, confirming the existence of oxygen vacancies in our samples. The Sm dopant is responsible for the oxygen vacancies. This also leads to an increased Curie temperature in the three composites.

Enhanced Charge Transport and Corrosion Protection Properties of Polyaniline–Carbon Nanotube Composite Coatings on Mild Steel

We report on the synthesis and characterization of carbon nanotube (CNT)-doped polyaniline (PANI) composites for enhanced corrosion protection of steel with improved electrical properties. PANI–CNT nanocomposites were prepared through in situ polymerization of aniline in the presence of CNTs. Synthesized nanocomposites were characterized by several analytical methods such as Fourier transform infrared spectroscopy, x-ray diffraction, micro-Raman spectroscopy, and scanning electron microscopy in order to understand the structural, morphological, and molecular aspects of the composites. The doping of CNTs in PANI matrix drastically enhanced the alternating current/direct current (AC/DC) conductivities as well as the dielectric attributes and impedance spectroscopy of the composites. The anticorrosion studies of the prepared composites were performed by using open-circuit potential analysis and potentiodynamic measurements. Compared to stainless steel, PANI–CNT nanocomposites demonstrated excellent anticorrosion behavior. The obtained results showed that 25 wt.% of CNT-doped PANI composite exhibits excellent anticorrosion properties due to electron transmission and passive catalysis.

Study of structural and electrical properties along with magnetic properties of Ni0.5−xMgxCu0.2Cd0.3Fe2O4 nanoferrites synthesized by employing sol–gel auto-combustion method

The mixed ferrite sample Ni0.5−xMgxCu0.2Cd0.3Fe2O4 (0.0 ≤ x ≤ 0.5, in the steps 0.1) has been synthesized employing sol–gel auto-combustion process. From XRD diffractograms, it has been observed the simple cubic spinel structure of the ferrite samples. With the substitution of Mg ion, both the experimental and theoretical lattice constant increased. For x = 0.0, the value of experimental lattice constant has been found 8.459 A, which increases to a value 8.490 A for x = 0.5. The surface morphology has been studied by FESEM images. Besides, the chemical composition and the elemental distribution of the sample have been revealed by EDS study. From the vibration band, the formation of spinel ferrite has been confirmed from the FT-IR spectra. It is seen that the samples exhibit ferrimagnetic behavior at room temperature, which has been shown by the magnetic measurement done by VSM. Dielectric constant, dielectric loss tangent, ac conductivity, and impedance Spectroscopy have been analyzed within the range 20 Hz–15 MHz. In the lower frequency region, a typical dielectric dispersion based on Maxwell–Wagner type interfacial polarization has been observed. Dielectric loss tangent exhibits an analogous sort of behavior as that of dielectric constant. The grain and grain boundary effect on electric properties have been studied from the complex impedance analysis. It has been seen that both the grain resistance and grain boundary resistance increase with the substitution of Mg2+ content. A rise in ac conductivity has been observed with the increase in frequency.

The fabrication and electrical properties of polyimide/boron nitride nanosheets composite films

Boron nitride nanosheets (BNNSs) and related polyimide (PI)/BNNSs composite films are synthesized by a molten salt intercalation-mechanical assisted stripping method and an in situ method respectively. The structures and morphologies of BNNSs and PI/BNNSs composite film were characterized by transmission electron microscopy (TEM), Atomic force microscopy (AFM), X-ray powder diffraction (XRD) and Fourier transform infrared spectrometer (FT-IR). The thermsal stability and electrical properties of the PI/BNNSs composite film were further investigated by thermogravimetric analysis (TG), dynamic mechniacal anlysis (DMA), insulation resistance tester, withstand voltage tester, broadband dielectric–impedance spectroscopy and corona resistance system (CRS) separately. For example, the corona resistance lifetime of PI/2.5BNNSs composite film is 36 min, which is 24 times than that of pure PI film. The result indicates that BNNSs, as a two-dimension material with high aspect ratio and the anisotropic characteristic, can be applied as one corona-resistant material.