Polymer Composite Films Research Articles

Crystallization engineering in PVDF enables ultrastable and highly efficient CsPbBr3 quantum dots film for wide color gamut Mini-LED backlight

The polymeric composite films incorporating inorganic lead halide perovskite quantum dots (CsPbX3 QDs, X = Cl, Br or I) are promising color conversion layers for wide gamut display devices such as Mini-LED backlight-based televisions. However, the relatively low emission efficiency and poor stability of these composite films present significant challenges for practical applications. In this study, we present a novel low-temperature in-situ crystallization strategy to prepare CsPbBr3/PVDF composite film through a rational designed of precursor, solvent and polymer structure. The strong interaction between PVDF and perovskite QDs via Lewis acid-base interaction allows for precise control over the crystallization and passivation of perovskite QDs. The optimized CsPbBr3/PVDF film exhibits bright emission with a photoluminescence quantum yield (PLQY) of up to 70 %, surpassing those of other CsPbBr3/polymers counterparts. Furthermore, the films demonstrate remarkable stability, retaining over 90 % of their original PLQY even after 50 days of aging under various environmental conditions such as exposure to air, immersion in water and blue light irradiation. By integrating the green and red emissive CsPbX3/PVDF films with blue Mini-LEDs, we successfully fabricate a prototype liquid crystal display (LCD) with an outstanding wide color gamut (128 % of NTSC 1931). These performances outperform that of commercial white-LED-based LCDs, highlighting the immense potential of CsPbX3/PVDF for high-definition display applications in the future.

Hydration–lubrication performance improvement via synergistic effects of free polymers and polymer brushes

In this study, we demonstrated hydration lubricity improvement via the synergistic effects of free polymers and brush films formed on a surface. We analyzed the hydration interfacial structure using neutron reflectometry and measured the shear viscoelasticity of the film using the fiber wobbling method. The results revealed that the volume fraction of the free polymer adsorbed on the brush film increased, leading to an improvement in the load-carrying capacity. Additionally, a water-rich layer formed on the surface owing to the brush film’s exclusion-volume effect, and this layer reduced the shear resistance and increased the lubricity. These insights into the composite films of polymer brushes and adsorbed free polymers offer new perspectives and design principles for the development of hydration lubrication.

Scalable Photochromic Film for Solar Heat and Daylight Management.

The adaptive control of sunlight through photochromic smart windows could have a huge impact on the energy efficiency and daylight comfort in buildings. However, the fabrication of inorganic nanoparticle and polymer composite photochromic films with a high contrast ratio and high transparency/low haze remains a challenge. Here, a solution method is presented for the in situ growth of copper-doped tungsten trioxide nanoparticles in polymethyl methacrylate, which allows a low-cost preparation of photochromic films with a high luminoustransparency (luminous transmittance Tlum = 91%) and scalability (30 × 350 cm2 ). High modulation of visible light (ΔTlum = 73%) and solar heat (modulation of solar transmittance ΔTsol = 73%, modulation of solar heat gain coefficient ΔSHGC = 0.5) of the film improves the indoor daylight comfort and energy efficiency. Simulation results show that low-e windows with the photochromic film applied can greatly enhance the energy efficiency and daylight comfort. This photochromic film presents an attractive strategy for achieving more energy-efficient buildings and carbon neutrality to combat global climate change.

Investigation of a polarizer-free liquid crystal phase modulation via nanometer size encapsulation of nematic liquid crystals

We have proposed an encapsulated liquid-crystal-polymer (LC-polymer) composite structure that is manufactured via the method of LC-in-polymer encapsulation. Through this approach, the optical phase of the nanometer size encapsulation LCs is effectively increased because the layer thickness of the capsuled LCs is easily increased by various coating methods with high filling ratio (> 55%) of LCs in the polymeric matrix with embedded LCs. In such a polymer composite film of nanometer size encapsulation LC, the phase modulation can be effectively enhanced by increasing the layer thickness without negatively affecting the operating voltage or response time. In experiments, the samples reliably switch from the isotropic phase to the anisotropic phase under an external electrical field, exhibiting high optical efficiency, low operational voltage (< 25Vrms), and fast response time (< 10msec). Additionally, the LC phase modulation is not only polarization-independent but also allows for flexible devices. The enhanced electro-optic performance of the proposed nanometer size encapsulated LC devices holds potential for various applications in flexible and tunable electro-optical systems.

Magnetic Resonance-Based Analytical Tools to Study Polyvinylpyrrolidone-Hydroxyapatite Composites.

The synthesis of biocompatible and bioresorbable composite materials, such as a "polymer matrix-mineral constituent," stimulating the natural growth of living tissues and the restoration of damaged parts of the body, is one of the challenging problems in regenerative medicine and materials science. Composite films of bioresorbable polymer of polyvinylpyrrolidone (PVP) and hydroxyapatite (HA) were obtained. HA was synthesized in situ in the polymer solution. We applied electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) approaches to study the composite films' properties. The application of EPR in two frequency ranges allowed us to derive spectroscopic parameters of the nitrogen-based light and radiation-induced paramagnetic centers in HA, PVP and PVP-HA with high accuracy. It was shown that PVP did not significantly affect the EPR spectral and relaxation parameters of the radiation-induced paramagnetic centers in HA, while light-induced centers were detected only in PVP. Magic angle spinning (MAS) 1H NMR showed the presence of two signals at 4.7 ppm and -2.15 ppm, attributed to "free" water and hydroxyl groups, while the single line was attributed to 31P. NMR relaxation measurements for 1H and 31P showed that the relaxation decays were multicomponent processes that can be described by three components of the transverse relaxation times. The obtained results demonstrated that the applied magnetic resonance methods can be used for the quality control of PVP-HA composites and, potentially, for the development of analytical tools to follow the processes of sample treatment, resorption, and degradation.

Impact of Two Lavender Extracts on Silver Nanoparticle Synthesis, and the Study of Nanoparticles’ Antibiofilm Properties and Their Ability to Transfer them into a Nontoxic Polymer

In this work, we aimed to analyze the impact of extracts prepared from dried Lavandula angustifolia (lavender) flowers and leaves on the synthesis of silver nanoparticles (AgNPs) (wherein the shape and size of AgNPs and the efficiency of the process were analyzed) and to prove the possibility of transferring the AgNPs’ properties into a polymer matrix. An ex situ method was used to incorporate AgNPs and prepare polymer matrix composite (PVP-AgNPs) films (via casting) and fibers (via electrospinning). We used UV-vis absorption spectrophotometry, Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM) to analyze and characterize the AgNPs and prepared composites. The results of FTIR analysis confirmed the presence of phytochemicals that can reduce silver ions from Ag+ to Ag0 in both extracts. The presence of spherical nanoparticles was confirmed via TEM regardless of the type of extract used. However, leaf extract caused the formation of AgNPs with a narrower size interval (an average size of 20 nm), and with higher efficiency, compared to the nanoparticles prepared using the flower extract. The nanoparticles prepared using the leaf extract were then incorporated into the polymer matrix, and thin polymer composite films and fibers were successfully prepared. The anti-biofilm activity of AgNPs colloids and prepared polymer nanocomposites against green algae Chlorella kessleri was studied. The anti-biofilm properties of the AgNPs were proved, along with the efficient transfer of their toxic properties into nontoxic polymer.

Preparation of PLGA-PEG/Hydroxyapatite Composites via Simple Methodology of Film Formation and Assessment of Their Structural, Thermal, and Biological Features

This study aimed to develop polymeric composite films suitable for applications in the field of bone tissue engineering. The preparation of PLGA-PEG/HAP composite films was achieved using a simple methodology, including mixing, sonication, and casting-drying stages. Characterization analyses, including FTIR, SEM, TGA-DSC, and XRD, were conducted to assess the properties of the composite films. The results showed that the PEG polymer decreased the glass transition temperature of the composite, while the HAP did not change. Further, weight remaining (%) values of HAP, PLGA-PEG, and PLGA-PEG/HAP were found as 94.04, 88.28, and 90.57, respectively. Thus, it can be concluded that HAP improves the thermal stability of PLGA-PEG. The outcomes of the analysis, encompassing the evaluation of physical, morphological, and thermal properties, demonstrate that the composite structure comprising PLGA and PEG polymers along with HAP ceramic material may attain the intended quality. Moreover, fluorescence microscopy was employed to visualize the interaction between cells and the composite films following DAPI staining to evaluate cell adhesion and proliferation on the PLGA-PEG/HAP composite films. PLGA-PEG/HAP composite films have no adverse effects on cells, such as toxicity, and they have also exhibited a favorable influence on cell proliferation, supporting an augmentation in cellular growth and adhesion. Overall, the results indicate that the synthesized PLGA-PEG/HAP composite films may hold the potential to serve as a promising candidate for applications in the field of bone tissue engineering.

Zeolite‐based polymer composite films for vegetables and fruits packaging: A review

AbstractThe deterioration of fruits during production, transportation, and storage has become one of the main challenges in supplying fruits based on consumer requirements. Therefore, the application of suitable packaging containing effective additives to improve the properties of the used film, is very important. In this article, the studies were conducted on the use of Zeolite as an effective additive to improve the properties of polymer packaging films owing to its high porosity and low toxicity. The results showed that the presence of zeolite in a packaging film can lead to the improvement of visual observation and firmness, reduction of weight loss and total soluble solids (TSS), and increase in the pH of the packed fruits. The results obtained from reviewing the literature show that the use of zeolite has different effects on the gas permeation or adsorption through the packaging films which can control the degradative parameters of fruits and vegetables. Surface modifiers can increase the efficiency of zeolites in packaging films which are also evaluated in this article.Highlights Packaging of fruits with the use of polymer films and zeolite as an additive increases their shelf life. Ethylene is a flammable gas with the formula C2H4 that accelerates the fruit ripening. Zeolites are hydrated aluminosilicates of alkali or alkaline earth cations that are crystalline and microporous. Zeolites are widely used in the packaging of polymeric composites, due to their chemical structure and unique characteristics. The visual features, firmness, pH, TSS, TA, and weight loss are factors to be investigated for each fruit.

Three-dimensional nitrogen and oxygen co-doped hierarchical porous carbons prepared from polyacrylonitrile/polyamic acid composite films for supercapacitors

Porous carbon materials are widely used in energy storage, adsorption, catalysis, and wastewater treatment. Polymer composite films of polyacrylonitrile (PAN) and polyamic acid (PAA) were firstly prepared by phase separation with modulation of coagulation bath composition. Using these composite films as precursors, nitrogen and oxygen co-doped porous carbon materials were successfully fabricated by preoxidation, carbonization, and subsequent NaOH activation. The porous carbons had a three-dimensional interconnected structure with a specific surface area of 450–737 m2 g−1. The pore volume was 0.245–0.508 m3 g−1 and the pore size mainly located between 1 and 5 nm. The activated porous carbon obtained from PAN/PAA coagulated at a DMSO to water ratio of 3 showed a high oxygen content of 28.0 wt% and nitrogen content of 3.3 wt%. The resultant porous carbon exhibited a good mass-specific capacitance of 407.7 F g−1 at a current density of 0.5 A g−1, an excellent rate capability (237.7 F g−1 at 20 A g−1) and cyclic stability. Using the material as the electrode, a coin-cell symmetric supercapacitor (CR2032) was assembled, which provided a specific capacitance of 156 F g−1 at 0.1 A g−1 and a maximum energy density of 10.9 Wh kg−1 at a power density of 50 W kg−1. The high number of heteroatoms as well as the textural properties could be beneficial for the improvement of electrochemical performance of the carbon-based supercapacitors.

High-temperature polymer dielectric films with excellent energy storage performance utilizing inorganic outerlayers

The optimization of high-temperature polymer capacitors is critical to the development of power electronics in harsh environments. The conduction loss of polymers increases dramatically at high temperatures, leading to a decrease in energy density and charge/discharge efficiency, which is a major impediment for capacitor applications. In this work, polyetherimide (PEI) composite films with trilayer structures are designed, in which the boron nitride nanosheet (BNNS) outer layers are optimized for charge blocking effect at multiple interfaces. The modulation of the inorganic layers not only increases the barrier height for charge injection from the electrodes, but also creates a PEI layer/BNNS layer interface that facilitates the formation of traps, thus effectively suppressing further carrier transport. Experiment and simulation verify that the construction of the trilayer structure promotes electric field redistribution, which significantly enhances high-temperature energy storage performance. At 200 °C, the energy density of the trilayer composite film is 3.81 J cm−3 with a charge/discharge efficiency >90 %, which is 766 % higher than PEI film (0.44 J cm−3 with a charge/discharge efficiency >90 %). Notably, the energy storage performance of trilayer composite film at high temperature is far superior to the reported high-temperature polymer dielectric films. This work demonstrates the promising potential of multilayer structures applied to dielectric polymer composite films at high temperatures.

The Preparation of Electrolyte Hydrogels with the Water Solubilization of Polybenzoxazine.

Polybenzoxazine (PBZ) exhibits excellent heat resistance, and PBZ derivatives have been designed and synthesized to achieve high performance. However, the application range of PBZ is limited by the strong interactions between molecular chains and its low solubility in organic solvents, thereby limiting its processability. This study focused on the benzoxazine structure as the molecular backbone of new hydrogel materials that can be applied as electrolyte materials and prepared functional gel materials. Here, we prepared hydrogels by water-solubilizing PBZ derivatives, which typically exhibit low solubility in organic solvents. Although studies on the hydrophilization of PBZ and its complexation with hydrophilic polymers have been conducted, no studies have been performed on the hydrogelation of PBZ. First, the phenol in the organic solvent-insoluble PBZ thin film obtained after the thermal ring-opening polymerization of the monomer was transformed into sodium phenoxide by immersion in a NaOH aqueous solution to water-solubilize it and obtain a hydrogel thin film. Although the hydrogel thin film exhibited low mechanical strength, a free-standing hydrogel film with improved strength was obtained through the double network gelation method with an acrylamide monomer system. The physical properties of the polymer composite hydrogel thin film were evaluated. The ionic conductivity of the hydrogel thin films was in the order of 10-4 S cm-1, indicating the potential of PBZ as an electrolyte hydrogel material. However, improving its ionic conductivity will be undertaken in future studies.

Corona: An effective polarization strategy of polymer composites with high-k filler for piezoelectric nanogenerators

Piezoelectric nanogenerators (PENGs) are mushrooming owing to demand of swift transformation of power supply from fossil fuel to green energy. Piezoelectric ceramics are enthusiastically chased because glorious PENGs demand for high piezoelectricity. Generally, brittleness of ceramics can be compensated by polymer, while the dielectric mismatch between low permittivity of polymer and high permittivity of ceramics plaguing researchers so long. Traditional contact poling is always interrupted by abrupt dielectric breakdown due to electric field concentration at interface between polymer and fillers. Here, we propose a strategy of using corona polarization instead of traditional contact polarization to insistently polarize large-area polymer composite films with high-k filler. The corona polarization technique can ignore the negative effect of local short circuit on polarization failure owing to prominent lateral insulation between deposited charges on surface of composites film, consequently obtaining well-performed piezoelectricity. Henceforth, polarization failure did not occur using corona even under poling voltage of 26 kV. The corona-poled PVDF/Y-ZnO PENG with only 15 wt% content of fillers generated output power density of ∼1064 μW/cm3. Our work will pilot the development of polymer composites with high-k filler and piezoelectric nanogenerators.

Comparative study of Structural, Optical and Dielectric properties of [(PVP:PVA)-Cr3+] and [(PVP:PVA)-La3+] Composite films

Polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA) polymer blend composite films doped with lanthanum (La) and chromium (Cr) ion were prepared via solution casting method. The x-ray diffraction (XRD) technique was used to examine the structural characteristics. UV-Visible photospectroscope was employed to measure optical properties and dielectric properties was measured using LCR meter. XRD results showed the semicrystalline behaviour of prepared films. Cr ion doped polymer blend composite film had an optical band gap of 4.17 eV, whereas La ion doped films had a band gap of 4.769 eV. From the comparative study of the (PVP:PVA)-Cr3+ and (PVP:PVA)-La3+ composite polymer films it was observed that La3+ doped film had lower dielectric constant. The ac conductivity of the (PVP:PVA)-Cr3+ film is found to be higher than the (PVP:PVA)-La3+ film.

Hydrogel with dual networks making reduced GO connection and orientation for a bi-directional thermal conductive film

With the rapid development of modern electronic devices, materials having high thermal conductivities (TCs) both in in-plane and through-plane directions are specially needed for thermal management. Whereas, the construction of efficient thermal-conductive pathways in bi-directions is still a challenge. Herein, a facile gel-drying approach is developed, achieving the formation of bi-directional pathways with the assistance of a dual-network structure. During the process, cellulose nanocrystal (CNC) with a high intrinsic TC was mixed with gellable cellulose (CNF) to form CNF/2CNC dispersion which was then used as a matrix. Reduced graphene oxide (RGO) foam with a network structure was used as a filler. The RGO network was tightly wrapped by the formed CNF/2CNC cross-linking network, resulting in a hydrogel with a dual-network structure. After drying, the resultant RGO-foam-CNF/2CNC film not only has a long-range orientation path in the horizontal direction, but also maintained a connected path in the vertical direction. The resultant film with 18.5 wt% RGO exhibited high TCs of 14.06 W·m−1·K−1 and 2.47 W·m−1·K−1 simultaneous for in-plane and through-plane directions, which is 21.6 times and 9.88 times higher than those of a typical CNF film, respectively. This strategy offers a new avenue for the designs of soft, cuttable, environmentally friendly polymer composite films with high TCs in bi-directions.

An Overview of Polymer Composite Films for Antibacterial Display Coatings and Sensor Applications.

The escalating presence of pathogenic microbes has spurred a heightened interest in antimicrobial polymer composites tailored for hygiene applications. These innovative composites ingeniously incorporate potent antimicrobial agents such as metals, metal oxides, and carbon derivatives. This integration equips them with the unique ability to offer robust and persistent protection against a diverse array of pathogens. By effectively countering the challenges posed by microbial contamination, these pioneering composites hold the potential to create safer environments and contribute to the advancement of public health on a substantial scale. This review discusses the recent progress of antibacterial polymer composite films with the inclusion of metals, metal oxides, and carbon derivatives, highlighting their antimicrobial activity against various pathogenic microorganisms. Furthermore, the review summarizes the recent developments in antibacterial polymer composites for display coatings, sensors, and multifunctional applications. Through a comprehensive examination of various research studies, this review aims to provide valuable insights into the design, performance, and real-time applications of these smart antimicrobial coatings for interactive devices, thus enhancing their overall user experience and safety. It concludes with an outlook on the future perspectives and challenges of antimicrobial polymer composites and their potential applications across diverse fields.

Free standing organometallic dimethylammonium zinc formate perovskite for photonic and antimicrobial applications

In this study, we have focused on the synthesis and analysis of a photoactive perovskite polymer composite film consisting of dimethylammonium zinc formate perovskite (DMAZF) as a crucial member of the metal-organic frameworks family, templated by polycarbonate. The characterization of DMAZF involved a comprehensive analysis using various techniques, including UV-VIS absorption spectra, Raman spectra, Fourier-transform infrared spectra, Z Scan, thermal analysis, frequency-dependent dielectric measurements, and nuclear magnetic resonance. The results of the characterizations revealed that the DMAZF composite film exhibits excellent crystallinity, promising thermodynamic capability for water splitting, desirable dielectric properties, nonlinear effects, and a remarkable surface response to adhering microorganisms, particularly against E. coli and S. aureus. The antibacterial activity was evaluated using the well diffusion method, confirming the material's potential as an antimicrobial agent. Moreover, Z scan studies have unveiled exciting technological applications of DMAZF, further enhancing its appeal as an emerging class of nanomaterial in nanotechnology.

Heteroatom-Doped Carbon Quantum Dots and Polymer Composite as Dual-Mode Nanoprobe for Fluorometric and Colorimetric Determination of Picric Acid.

Oxygen- and nitrogen-heteroatom-doped, water-dispersible, and bright blue-fluorescent carbon dots (ON-CDs) were prepared for the selective and sensitive determination of 2,4,6-trinitrophenol (picric acid, PA). ON-CDs with 49.7% quantum yield were one-pot manufactured by the reflux method using citric acid, d-glucose, and ethylenediamine precursors. The surface morphology of ON-CDs was determined by scanning transmission electron microscopy, high-resolution transmission electron microscopy, dynamic light scattering, Raman, infrared, and X-ray photoelectron spectroscopy techniques, and their photophysical properties were estimated by fluorescence spectroscopy, UV-vis spectroscopy, fluorescence lifetime measurement, and 3D-fluorescence excitation-emission matrix analysis. ON-CDs at an average particle size of 3.0 nm had excitation/emission wavelengths of 355 and 455 nm, respectively. With the dominant inner-filter effect- and hydrogen-bonding interaction-based static fluorescence quenching phenomena supported by ground-state charge-transfer complexation (CTC), the fluorescence of ON-CDs was selectively quenched with PA in the presence of various types of explosives (i.e., 2,4,6-trinitrotoluene, tetryl, 1,3,5-trinitroperhydro-1,3,5-triazine, 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane, pentaerythritol tetranitrate, 3-nitro-1,2,4-triazole-5-one, and TATP-hydrolyzed H2O2). The analytical results showed that the emission intensity varied linearly with a correlation coefficient of 0.9987 over a PA concentration range from 1.0 × 10-9 to 11.0 × 10-9 M. As a result of ground-state interaction (H-bonding and CTC) of ON-CDs with PA, an orange-colored complex was formed different from the characteristic yellow color of PA in an aqueous medium, allowing naked-eye detection of PA. The detection limits for PA with ON-CDs were 12.5 × 10-12 M (12.5 pM) by emission measurement and 9.0 × 10-10 M (0.9 nM) by absorption measurement. In the presence of synthetic explosive mixtures, common soil cations/anions, and camouflage materials, PA was recovered in the range of 95.2 and 102.5%. The developed method was statistically validated against a reference liquid chromatography coupled to tandem mass spectrometry method applied to PA-contaminated soil. In addition, a poly(vinyl alcohol)-based polymer composite film {PF(ON-CDs)} was prepared by incorporating ON-CDs, enabling the smartphone-assisted fluorometric detection of PA.

SPR studies in PVA composite films of SiO2@NaYF4:Er3+/Yb3+ UCNPs via AuNPs concentration variation and their temperature sensing applications

The composite film of mesoporous silica coated NaYF4:Er3+/Yb3+ upconversion nanoparticles and gold nanoparticles (AuNPs) in Poly vinyl alcohol (PVA) medium were prepared. The effect of the concentrations of AuNPs with 0 µl, 50 µl, 100 µl and 150 µl on the structure and upconversion luminescence intensity were studied. The phenomenon of enhancement in upconversion luminescence intensity due to AuNPs were explained via surface plasmon resonance (SPR) phenomenon. Apart from this the XRD, FE-SEM and AFM studies were done for estimation of structure and surface morphology etc. The impurities were estimated through FTIR analysis. The optical properties of these polymer composite films were studied via UV–vis absorption spectra and upconversion luminescence spectra analysis. A low temperature sensing ability of these films have been demonstrated for the suitability of these films in bio-medical applications.

Multi-layer film surface functionalized PMF sensor for real-time humidity measurement

Real-time monitoring of environmental relative humidity (RH) plays a crucial role in ensuring both the quality of industrial production and the quality of life. In this work, polarization maintaining fiber (PMF) was used as carriers to creatively constructed multi-layer film surface functionalization on its cladding surface. The indium tin oxide (ITO) film and polyvinyl alcohol (PVA) doped graphite oxide (GO) composite polymer constitute multi-layer humidity sensitive film, which has the effect of dual absorption of water and improves the humidity sensitivity. Microporous composite polymer films created by laser processing increase the area for water evaporation and absorption, which improve response speed, and reduce recovery time. The surface functionalized PMF sensor exhibits high sensitivity and rapid response to humidity, achieving bidirectional repeated measurement of 0.28 nm/% within 10 s in the measurement range of 30%-90%, rendering it a reliable means for real-time monitoring of humidity.

Aligned silver Nanowires/Polymer composite films for ultrasensitive and highly stretchable strain sensors

Strain sensor films are widely applied in electronic skins, soft robotics and human health monitoring etc. However, fabrication of ultrasensitive and highly stretchable strain sensor films remains a great challenge because of the trade-off between sensitivity and stretchability. Here, we report an aligned silver nanowires (Ag NWs)/polymer composite film prepared by a float assembly method. After perpendicularly stacking two layers of Ag NWs/polymer composite films into one sensor film, it exhibits an ultrahigh sensitivity with gauge factor (GF) up to 2.98 × 106 and a very large working range of 200% due to different resistance response mechanism of the cross film structure. The low limit of detection is as low as 0.001%. Accordingly, the strain sensor films can detect both large deformation and subtle vibration for human motion and monitoring, even early warning of earthquakes. This work provides a new idea to fabricate stain sensor films with both ultrahigh sensitivity and large stretchability.