Kun Dai

Kun Dai
Zhengzhou University | zzu · College of Materials Science and Engineering, The Key Laboratory of Advanced Materials Processing & Mold of Ministry of Education

Ph.D

About

206
Publications
24,835
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
10,476
Citations
Citations since 2017
128 Research Items
9749 Citations
201720182019202020212022202305001,0001,5002,0002,500
201720182019202020212022202305001,0001,5002,0002,500
201720182019202020212022202305001,0001,5002,0002,500
201720182019202020212022202305001,0001,5002,0002,500
Introduction
My main research fields include conductive polymer composite materials and relationship between polymer processing-structure-properties.
Additional affiliations
December 2014 - June 2016
Zhengzhou University
Position
  • Professor (Associate)

Publications

Publications (206)
Article
Thermoplastic polyurethane (TPU) based conductive polymer composites (CPCs) with a reduced percolation threshold and tunable resistance-strain sensing behavior were obtained through the addition of synergistic carbon nanotubes (CNT) and graphene bifillers. The percolation threshold of graphene was about 0.006 vol% when the CNT content was fixed at...
Article
Full-text available
Conductive thermoplastic polyurethane (TPU) nanocomposites filled with graphene were fabricated and tested for organic vapor sensing. The observed finely dispersed graphene in the TPU matrix benefited the formation of efficient conductive paths and the generation of stable electrical signal. Organic vapor sensing behaviors of the conductive polymer...
Article
Conductive polymer composites (CPCs) have found applications as eco-friendly vapor sensor. In this study, ramie fiber (RF) was incorporated into poly (lactic acid) (PLA), an eco-friendly polymer, through a premixing process of conductive fillers (carbon black (CB) and carbon nanotubes (CNTs)) and RF. The introduction of RF increases the crystallini...
Article
Ultrahigh compressibility has been observed in the lightweight porous carbon nanotube (CNT)-thermoplastic polyurethane (TPU) nanocomposites prepared by the thermally induced phase separation (TIPS) technique. The porous structure has significantly reduced the density to approximately 0.1 g·cm−3. The nanocomposites prepared with a sonication time of...
Article
Full-text available
An electrically conductive ultralow percolation threshold of 0.1 wt% graphene was observed in the thermoplastic polyurethane (TPU) nanocomposites. The homogeneously dispersed graphene effectively enhanced the mechanical properties of TPU significantly at a low graphene loading of 0.2 wt%. These nanocomposites were subjected to cyclic loading to inv...
Article
Highly sensitive and flexible capacitive sensors are in great demand for wearable electronics, which can be achieved by preparing micropatterns on their dielectric layer surface. However, most micropatterns are often molded with the silicon template acquired by complex processes which are very time-consuming and costly. Here, a dielectric layer wit...
Article
Triboelectric nanogenerator (TENG) which can work as novel power provider and self-powered sensor has been in rapidly developed recently. However, fabricating large-area TENG through a one-step, continuous, and environmentally friendly method still remains a challenge but highly desired. Herein, large-area sandwiched film based triboelectric nanoge...
Article
Stretchable strain sensors with integrated attributes of flexibility and robustness are urgently required owing to their promising applications in healthcare monitoring and environment detection. Herein, we achieved a highly stretchable thermoplastic polyurethane (TPU) mat (PUM) through electrospinning, then decorated with polyaniline (PANI) nanopa...
Article
Smart tactile sensing materials have excellent development prospects, including wearable health‐monitoring equipment and energy collection. Hydrogels have received extensive attention in tactile sensing owing to their transparency and high elasticity. In this study, highly crosslinked hydrogels are fabricated by chemically crosslinking polyacrylami...
Article
Aqueous proton batteries (APBs) have aroused attention because of the proton as charge carrier with smaller ionic size and faster kinetics when compared to the metallic ions in aqueous solutions. Although phenazine-based organic compounds with available redox-active sites are considered as promising organic electrode materials, the comprehensive st...
Article
Full-text available
Daytime radiative cooling materials have recently attracted tremendous interest by reflecting sunlight and radiating heat to the ultracold outer space without any energy consumption. While some progress has been made, it remains a big challenge in fabricating highly efficient, low-cost, biodegradable, and sustainable all-day radiative coolers. Here...
Article
Aqueous alkali-ion batteries are a kind of risk-free and low-cost energy storage devices for portable equipment and wearable products. Even though phenazine-based organic compounds have π-conjugated aromatic structures and contain N heteroatoms with redox-active centers, the limited capacity performance still hinders their application as the electr...
Article
Recently, soft actuators have attracted considerable interest owing to their biomimetic performance. Unfortunately, it remains a great challenge to fabricate multi-stimuli-responsive soft actuators by a facile but low-cost method. Herein, a thermoplastic film with bilayered architecture was designed and fabricated by a one-step method. This bilayer...
Article
Aqueous ammonium ion batteries (AAIBs) are considered potential energy storage solutions due to their faster kinetics, eco-friendliness, and high safety. Yet, appropriate electrode material for AAIBs is in continual investigation. Here, Prussian blue analogues (PBAs), Na0.73Ni[Fe(CN)6]0.88, are applied by a covalent bond assisted engineering with i...
Article
Surface-enhanced Raman spectroscopy (SERS) technology has been regarded as a most efficient and sensitive strategy for the detection of pollutants at ultra-low concentrations. Fabrication of SERS substrates is of key importance in obtaining the homogeneous and sensitive SERS signals. Cellulose filter papers loaded with plasmonic metal NPs are well...
Article
Polymer functional films (PFFs) with switchable transparency have drawn increasing interests recently for their promising applications. Unfortunately, it still remains a challenge to fabricate large-area temperature-driven PFFs by a facile, continuous and environmentally friendly method. Herein, via coextrusion blow film molding, sandwiched polymer...
Article
Flexible transparent conductive films (FTCFs) are critically important for the emerging flexible electronic devices. To this end, FTCFs with conductive gratings have drawn more interests in the past decades. However, there are great challenges to fabricate such FTCFs containing conductive gratings in a facile way. Borrowing the idea from traditiona...
Article
Dielectric elastomers are indispensable for soft actuators due to their fast actuation response and diverse configuration. However, the existing dielectric elastomers have poor electromechanical performance and are vulnerable to damage or failure, highlighting an urgent need for materials with remarkable dielectric, mechanical and self-healing prop...
Article
Triboelectric nanogenerators (TENGs) have emerged as portable and self-powered sensors owing to its effective energy harvesting capability and rapid electrical responsive signals. Enlarging the contact area is an efficient way for improving output performance of TENGs. Nevertheless, few effective ways to fabricate high roughness nanofibrous mat hav...
Article
Although polypyrrole (PPy) has been recognized as a promising organic electrode for rechargeable aqueous batteries (RABs), the practical application is still restricted by its rapid capacity fading after repeated cycles. Herein, a multilayer structural MXene-stabilized PPy ([email protected]) composite has been purposefully designed via a facile di...
Article
In this paper, the dispersion of multi walled carbon nanotubes (MWCNTs) in Polyvinyl alcohol(PVA) was achieved by using dimethyl sulfoxide/N,N-dimethylformamide mixed solvent combined with ultrasonic and centrifugation then PVA/MWCNTs hydrogels composite were prepared. The effects of PVA mass fraction, species and mass fraction of MWCNTs on the str...
Article
Full-text available
Highlights The cationic waterborne polyurethanes microspheres with Diels-Alder bonds were synthesized for the first time. The electrostatic attraction not only endows the composite with segregated structure to gain high electromagnetic-interference shielding effectiveness, but also greatly enhances mechanical properties. Efficient healing property...
Article
Frequent oil spills on water have always generated serious ecological disasters and environmental crises in recent years. Unfortunately, the traditional oil/water separation and collection process is in an intermittent mode and therefore suffers from expensive, time-consuming and complicated procedures. Undoubtedly, it is necessary to develop a fac...
Article
The structural evolution of propylene-ethylene copolymer (coPP) and propylene-ethylene copolymer/polypropylene (coPP/iPP) films has been studied by in-situ WAXD/SAXS in a tensile process. Both coPP and coPP/iPP films show obvious melt-recrystallization during the deformation process. In the initial stage of stretching, the crystallinities of films...
Article
Full-text available
Smart skin is highly desired to be ultrasensitive and self-powered as the medium of artificial intelligence. Here, an ultrasensitive self-powered mechanoluminescence smart skin (SPMSS) inspired by the luminescence mechanism of cephalopod skin and the ultrasensitive response of spider-slit-organ is developed. Benefitting from the unique strain-depen...
Article
The tribological properties of monomer casting nylon-6 (MC PA6) play an important role in ensuring energy consumption, component integrity and reliability in construction machinery. In this work, MC PA6 coatings containing different amount of lube base oil-loaded poly(urea-formaldehyde) microcapsules are prepared, and the tribological properties of...
Article
Endowing strain sensors with superhydrophobicity is of great importance to guarantee their long-term service under harsh environments (such as wet, acid, alkali and salt atmospheres), whereas, the development of superhydrophobic strain sensors remains a great challenge. Herein, we realized a superhydrophobic and highly sensitive sensor for subtle h...
Article
Polyvinyl alcohol (PVA) and polyacrylamide (PAM) hydrogels as well as silver particles (Ag) composites are prepared by compound gelation. The structure and properties of the composites, which are controlled by the reaction of acrylamide in the hydrogel, are analyzed and the feasibility of their application in strain sensors are explored. The effect...
Article
A highly sensitive and stretchable strain sensor is urgently required in wearable applications. Nevertheless, high sensitivity requiring a significant structural variation even at a subtle deformation and large stretchability related to morphological integrity under a large strain are considered as two contradictory performance indicators of strain...
Article
Polymer actuators that can produce programmed deformations upon environmental stimulation (e.g., heat, light, electricity and chemical vapor) have attracted more attention due to their great potential in some emerging fields of soft robots, sensors, biomimetic devices, artificial muscles, etc. Unfortunately, interfacial failure is frequently happen...
Article
Dielectric elastomers widely used for actuation applications (e.g., soft robots, tunable optics) are vulnerable to mechanical damage, so healability is crucial and is associated with the reliability and service lifetime of dielectric elastomer actuators (DEAs). For DEAs, other than healability, simultaneously possessing a superior actuation perform...
Article
Wearable strain sensors promote various emerging intelligent fields. Compared with the planar strain sensors, fibrous strain sensors are highly desirable for practical applications because they are favour of conformably attaching onto uneven surfaces and integrating into regular fabrics. Herein, inspired by the growth ring of tree, a highly stretch...
Article
Barium ferrite (BaFe12O19) is considered as potential microwave absorption (MA) material thanks to the large saturation magnetization, high Curie temperature, and excellent chemical stability. The integration of carbon nanotube (CNT) can improve the dielectric loss of BaFe12O19 for further enhanced MA performance, nevertheless, the MA performance i...
Article
In order to eliminate the secondary electromagnetic pollution, it is imperative to develop high-performance electromagnetic shielding materials with high-efficiency absorption coefficient. However, it remains a formidable challenge to simultaneously achieve high EMI shielding effectiveness (SE) and high absorption coefficient. Herein, a facile and...
Article
Full-text available
Conductive hydrogels (CHs) have been highlighted in the design of flexible strain sensors and stretchable triboelectric nanogenerators (TENGs) on the basis of their excellent physicochemical properties such as large stretchability and high conductivity. Nevertheless, the incident freezing and drying behaviors of CHs by using water solvent as the di...
Article
Electronic skins (e‐skins) have attracted great attention for their applications in disease diagnostics, soft robots, and human–machine interaction. The integration of high sensitivity, low detection limit, large stretchability, and multiple stimulus response capacity into a single e‐skin remains an enormous challenge. Herein, inspired by the struc...
Article
Carbon aerogels derived from biomass have been considered as potential microwave absorption (MA) materials because of the intrinsic hierarchical porous structure, low density, and excellent heat resistance. However, high carbonation temperature or long carbonation time is always required to achieve optimized MA performance. Herein, the low-temperat...
Article
Poor linearity and high hysteresis as two crucial issues of stretchable and flexible strain sensors are urgently needed to be addressed to improve the sensors’ practical applicability. In this work, sacrificial template method coupled with ultrasonication technique are employed to fabricate a carbon black (CB)/polydimethylsiloxane (PDMS) foam (CPF)...
Article
Electronic skin (e-skin) based on elastic piezoresistive sensor is considered to be one of the most important components for future wearable electronic devices, whose performances can be substantially improved by shaping patterned surface. However, most patterned surfaces are generally fabricated via some tedious methods. Obviously, it is still a h...
Article
Multifunctional and flexible intelligent devices are urgently desired to solve increasingly serious environmental concerns on human bodies. However, rendering the devices’ multifunctionalities without sacrificing their innate flexibility and properties remains a huge challenge. Herein, a facile and efficient strategy with Ag precursor reduction fol...
Article
Recently, the increasing demands of energy saving and various human thermoregulation equipment give rise to the resurgence of functional fabrics. Therefore, the fibers/microfibrilar bundles with thermal management ability, which can be woven into various functional fabrics, have aroused much attention. Unfortunately, reported techniques to fabricat...
Article
Designing lightweight polyimide (PI) foam with low density, high heat resistance, excellent electromagnetic interference (EMI) shielding ability and good compressibility is urgent in practical application of aeronautics and aerospace. However, to guarantee high EMI shielding effectiveness (EMI SE), high conductive filler content was always required...
Article
Flexible and wearable strain sensors with multi-functionalities have aroused tremendous attention for various applications in disease diagnostics, environment detection and healthcare monitoring, etc. However, limited electromechanical performance and complicated fabrication process of strain sensors restrict their extensive applications in full-ra...
Article
Full-text available
Construction of segregated structures within conductive polymer composites (CPCs) is a prospective strategy to enhance electromagnetic interference (EMI) shielding effectiveness (SE). However, the CPCs of segregated structures frequently experience worsened mechanical performances due to weak interface reactions between adjacent polymer domains, wh...
Article
Full-text available
Wearable smart devices should be flexible and functional to imitate the warmth and sensing functions of human skin or animal fur. Despite the recent great progress in wearable smart devices, it is still challenging to achieve the required multi-functionalities. Here, stretchable hollow-porous fibers with self-warming ability are designed, and the p...
Article
Currently used humidity sensors have a large size which seriously hinders their applications in many special fields. Therefore, a facile way for fabricating miniaturized humidity sensors is desired. In this work a high-performance, nanofiber bundle sensor (NfBS) was fabricated through immersing nylon66 (PA66)/multiwall carbon nanotubes (MWCNTs) nan...
Article
Anisotropic conductive films (ACFs) are of great significance in miniaturized sensing devices, however it still is a huge challenge to fabricate ACFs via a facile and cost-effective method. Herein, ACFs containing aligned conductive stripes have been developed based on polypropylene (PP)/multi-walled carbon nanotubes (MWCNTs) composite. Compared wi...
Article
Full-text available
Solar distillation is a sustainable and promising technique to generate fresh water. However, the solar vapor generation is a high energy consumption process, resulting in a low water yield under natural sunlight. Hence, developing of advanced evaporators that can simultaneously reduce the energy requirement of water vaporization and accelerate sol...
Article
Full-text available
Wearable strain sensors based on flexible conductive polymer composites (FCPCs) have attracted great attention due to their applications in the fields of human–machine interaction, disease diagnostics, human motion detection, and soft robotic skin. In recent decades, FCPC‐based strain sensors with high stretchability and sensitivity, short response...
Article
Smart and wearable strain sensors have sparked enormous research interests in various applications of flexible electronic devices. For this topic, it remains a huge challenge to acquire wide sensing range, high sensitivity, superior durability and fast response synergistically. Herein, we present an ultra-sensitive and durable strain sensor with sa...
Article
Flexible strain sensor has promising features in successful application of health monitoring, electronic skins and smart robotics, etc. Here, we report an ultrasensitive strain sensor with a novel crack-wrinkle structure (CWS) based on graphite nanoplates (GNPs)/thermoplastic urethane (TPU)/polydimethylsiloxane (PDMS) nanocomposite. The CWS is cons...
Article
Excellent thermal management capacity is urgently required to tackle booming heat flux density of electronic devices. As an attractive building block in constructing functional materials, graphene oxide (GO) is plagued with low thermal conductivity (TC). In this contribution, we constructed aligned hybrid network in the GO film to ameliorate multif...
Article
Conductive polymer composites (CPCs) with segregated structure can achieve excellent electrical conductivity with low conductive filler, whereas, the weak interfacial adhesion always impairs their mechanical performance which limits the practical applications. Herein, we developed a carbon nanotube (CNT)/thermoplastic polyurethane (TPU) composite c...
Article
Carbon nanotubes (CNTs) are potential electromagnetic (EM) wave absorption (MA) material due to the strong dielectric loss, nevertheless, sole CNTs suffer from limited MA ability because of the interface impedance mismatch of CNTs and the skin effect, which leads to high reflection of EM wave. The impedance mismatch characteristics of CNTs can be e...
Article
Integrated flexible devices simultaneously with strain sensing and energy storage functions are urgently desirable to detect human motion for potential wearable applications. Herein, this paper reports the fabrication of cotton/carbon nanotube (CNTs) sheath-core yarn deposited with poly-pyrrole (PPy) for highly multifunctional stretchable wearable...
Article
In this study, self-assembled three-dimensional (3D) reduced graphene oxide/nickel (rGO/Ni) nanofibers with hierarchical core-shell structure and vertically aligned graphene edge planes are synthesized as an efficient microwave absorption material. Electromagnetic multifunctional Ni chains form the skeleton of 3D nanofibers, and 2D rGO nanosheets a...
Article
2D carbon nanosheets are promising electrode materials for high-efficiency lithium ion batteries (LIBs). However, the bottleneck in this field is how to obtain high quality carbon nanosheets via a scalable and facile procedure while well-maintaining superior Li⁺ storage performance. Herein, an efficient airflow annealing method to prepare porous ca...
Article
Full-text available
Absorption-dominated electromagnetic interference (EMI) shielding polymer composites with low reflection are greatly desired for next-generation electronic devices due to their minimization of secondary electromagnetic radiation pollution. However, realizing highly efficient EMI shielding with microwave absorption-dominated features remains a great...
Article
Electromagnetic interference (EMI) shielding composites are inevitably damaged in the long-term usage which would affect the regular operation of the devices. Hence, the demand for materials with healable and reliable EMI shielding performance has increased. Here, a flexible conductive composite owning both self–healing and EMI shielding functions...
Article
Effective heat dissipation capacity and electromagnetic interference (EMI) shielding performance are urgently required for modern electronic equipment. Herein, pristine carbon nanotubes (CNTs) were first nondestructively functionalized by eco-friendly dopamine chemistry, which maintains the integrity of inherent graphitic lattice structure of CNTs....
Article
Superhydrophobic materials integrating electrical conductivity with stretchability are strongly desirable for the emerging flexible electronic devices, such as wearable electrical heaters, strain sensors, and flexible power storage apparatus, due to their long-term safe service even under wet or corrosive environment. However, it still remains a gr...
Article
The preparation of a satisfactory strain sensor integrated with ultrahigh sensitivity, large application range and superior stability is still a huge challenge. Herein, a highly stretchable carbon black/thermoplastic polyurethane fibrous strain sensor with porous and core-sheath structure is successfully prepared via an efficient coaxial wet-spun a...
Article
Rapid development of wearable electronic devices stimulates various requirements for power supply devices, such as sustainability, maintenance-free and stretchability. Herein, we fabricate a flexible and self-powered electronic skin (e-skin) based on an ultra-stretchable triboelectric nanogenerator (STENG) by multilayered thermoplastic polyurethane...
Article
Various sensors have been developed to monitor the changes in physical quantities to meet the growing demand for wearable electronics. While it is still a huge challenge to design a multifunctional flexible sensor with both high strain responsivity and good breathability. In this work, through electrospinning, ultrasonication and in-situ polymeriza...
Article
Excellent electromagnetic interference (EMI) shielding ability, lightweight, and good heat resistance are highly required for practical applications of EMI shielding materials, such as in areas of aerospace, aircraft and automobiles. Herein, a lightweight and robust carbon nanotube (CNT)/polyimide (PI) foam was developed for efficient and heat-resi...
Article
Flexible transparent conductive film (TCF) is an important component in many modern smart devices. Recent TCF is always fabricated based on indium tin oxide (ITO). However, the drawbacks of ITO (e.g., brittle nature, high cost and resource scarcity) and the complex preparation process of TCF limit the massive production and further application of T...
Article
Electronic textiles featuring controllable strain sensing capability and comfortable wearability have attracted huge interests with the rapid development of wearable strain sensor systems. It is still a great challenge to simultaneously achieve strain sensor with low cost, biocompatibility, large-area compatibility and excellent sensing performance...
Article
With the booming development of flexible electronics, the need for a multifunctional and high-performance strain sensor has become increasingly important. Although significant progress has been made in designing new microstructures with sensing capabilities, the trade-off between sensitivity and workable strain range has prevented the development o...
Article
Polymer composites with high thermal conductivity and good electrical insulation property exhibit great potential applications in electronic packing field. Herein, we report a composite film through functional Al2O3 (f-Al2O3) deposited graphene as fillers to regulate both the thermal conductivity and the electrical insulation property of nanofibril...