Composite Nanofiber Membranes Research Articles

Preparation of graphene oxide/carboxymethyl chitosan/polyvinyl alcohol composite nanofiber membranes by electrospinning for heavy metal adsorption

AbstractIn this paper, a graphene‐oxide/carboxymethyl‐chitosan/polyvinyl‐alcohol (GO/CMC/PVA) composite nanofiber membrane was prepared by electrospinning and cross‐linking with glutaraldehyde (GA) to improve the water resistance. The composite nanofiber membrane can be used in the field of heavy metal adsorption. The membrane was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction. The effects of GO concentration, adsorption time, and initial concentration of heavy‐metal ion (Ni2+, Cu2+, Ag+, and Pb2+) solution on the adsorption performance of the fiber membranes were investigated. The results showed that the addition of GO can reduce the diameter of nanofibers. GO, CMC, and PVA exhibited good compatibility, and the intermolecular hydrogen bonding improved. The addition of GO also improved the crystalline properties of the composite fiber membrane. In the optimal cross‐linking condition, GA was saturated by steam cross‐linking for 6 h. The introduction of GO improved the adsorption capacity of the membrane for heavy metals in water. The utmost adsorption capacities for Ni2+, Cu2+, Ag+, and Pb2+ were 262.1, 237.9, 319.3, and 413.6 mg/g when using the cross‐linked composite fiber membranes, respectively. The results of adsorption kinetics and thermodynamics showed that the adsorption process accorded with the pseudo‐second‐order kinetic model and Langmuir–Freundlich isotherm model.

Nanofiber composite ultrafiltration membrane functionalized with cross-linked β-cyclodextrin for steroid hormone micropollutant removal

Steroid hormone (SH) micropollutants are not efficiently removed with conventional membrane processes. Cyclodextrins are macrocyclic molecules widely applied in water treatment for the removal of these micropollutants. In this study, a composite nanofiber membrane (CNM) containing cross-linked β-cyclodextrin-epichlorohydrin (βCDP) was prepared by electrospinning the functionalized nanofibers onto an ultrafiltration membrane support.The CNM membrane was evaluated for SH removal in both static adsorption and during filtration. A removal of 80 % was reached in static condition with a βCDP loading of 2.5 ng/cm2. During filtration, the hydraulic residence time, SH concentration and nanofiber matrix thickness limited SH removal and uptake. The highest removal of 76 % and uptake of 9.5 ng/cm2 were achieved with a nanofiber matrix thickness of 442 μm. Molecular dynamic simulation revealed that SH type affected the βCDP interaction and inclusion complex formation, the strongest interaction occurred with progesterone and the lowest with testosterone. This was consistent with experimental data.Overall, the results are promising for the application of this functionalized membrane for SH removal due to the high adsorption capacity and the ability to form a specific inclusion complex interaction with the SH molecules.

PVA /PDA@g-C3N4 Composite Nanofiber Membranes for Enhanced Photocatalytic Bacteriostasis and Degradation

PVA /PDA@g-C3N4 Composite Nanofiber Membranes for Enhanced Photocatalytic Bacteriostasis and Degradation

Facile fabrication of electrospinning cellulose acetate/graphene composite nanofiber membrane with high solar-to-thermal conversion and oil resistance performance for efficient solar-driven water evaporation

Solar-driven water evaporation is a promising approach to solve the issue of water resource shortage. Herein, a cellulose acetate (CA)/graphene(G) nanofiber membrane evaporator with superior oil resistance was prepared by electrospinning and subsequently with the deacetylation process. The as-fabricated d-CA/G composite nanofiber membranes possess high solar absorption, high porosity, and low thermal conductivity. The evaporation rate of d-CA/G composite nanofiber membrane with a graphene concentration of 3 % for pure water can reach 1.38 kg m−2 h−1 with the corresponding efficiency of 88.4 % under one sun illumination. Moreover, the d-CA/G composite nanofiber membrane possesses super hydrophilic and underwater superoleophobicity. Thus, the d-CA/G composite nanofiber membrane can resist fouling by oils and dissolve the concentrated salt back into bulk water, resulting in efficient purification capacity for oil-in-water emulsion and stable desalination performance for seawater in the long term. The evaporation rate of the d-CA/G evaporator can approach 1.37 kg m−2 h−1 when used for the purification of oil-in-water emulsion. This study provides a facile way for the development of multifunctional nanofiber membrane evaporators with highly efficient and sustainable for seawater desalination and wastewater treatment.

Effective preparation of environmentally friendly polyglycolic acid (PGA) nanofibrous membrane with antibacterial property for high-efficiency and low-resistance air filtration

In recent years, the antibacterial air filters have been crucial for protecting human health. However, most commercial filters are made of non-biodegradable petroleum polymers, which poses a great challenge for environment protection of recycling after large-scale use. Hence, the air filtration membrane, biodegradable polyglycolic acid loaded with antibacterial ε-polylysine-dialdehyde microcrystalline celluloses (PGA@EPL-DAMCs), was prepared by electrospinning. The incorporation of EPL-DAMCs varied the morphology of the resultant PGA@EPL-DAMCs and endowed them with good antibacterial activity. In addition, it was found that the PGA/EPL-DAMC-24% exhibited the best filtration efficiency (99.83%) and bacterial rate (up to 99.97% and 99.99% for E.coli and S.aureus, respectively). Finally, the degradation performance of the PGA electrospun membrane was also investigated, indicating that PGA@EPL-DAMCs composite nanofiber membranes had broad prospects in biodegradable filtration material, can be applied to develop biodegradable and environmentally friendly medical protective materials with highly efficient air filtration and significant antimicrobial effects.

Enhanced sensitivity and detection range of a flexible pressure sensor utilizing a nano-cracked PVP hierarchical nanofiber membrane formed by BiI3 sublimation

The development of a highly sensitive and wide-range flexible pressure sensor is great significant to realize the practical applications in human–computer interaction, health monitoring, and motion detection. Here, a dielectric layer of nano-cracked polyvinyl pyrrolidone (PVP) hierarchical nanofiber membrane (HNM) was fabricated by sublimating BiI3 from an electrospun BiI3/PVP composite nanofiber membrane (NM) via one-step annealing process. The upper and lower electrodes of porous laser-induced graphene (LIG) were produced through the engraving process on polyimide (PI) substrates. Subsequently, a flexible capacitive pressure sensor was constructed by assembling the middle PVP HNM dielectric layer with upper and lower LIG electrodes, which demonstrates enhanced sensitivity and detection range for motion posture recognition. Experimental results indicate that compared with traditional PVP NM-based pressure sensor, the assembled sensor in this work exhibits 22 times higher sensitivity (at 2–100 kPa) and 4 times wider detection range (0–200 kPa). Additionally, the sensor boasts a fast response/recovery time of 29/41 ms, an exceptionally low detection limit of 2.7 Pa, and an outstanding stability of 3000 cycles. With the aid of a convolutional neural network (CNN) algorithm, a shooting posture recognition system was developed by multiple sensors to accurately identify (accuracy: 93.89 %) and guide the shooting postures of basketball players.

Preparation and Antibacterial Properties of PLA-Based Composite Nanofiber Membrane Material Loaded with Cationic Antibacterial Agent by Electrospinning

With the continuous application of antibacterial materials, various problems have emerged, such as expensive prices and the potential development of resistance. Cationic antibacterial agents, due to their high solubility, reactivity, and antibacterial properties, are considered as environmentally friendly and cost-effective antibacterial agents. In addition, the electrospinning technique is recognized as a versatile and high-efficiency method to produce nanofibers with multifunctional properties and adjustable structures. In this work, we prepared a series of nanofiber membranes by electrospinning technology using hexadecyl trimethyl ammonium Bromide (CTAB) and 5-Chloro-8-hydroxyquinoline (5-Cl8Q) as antibacterial agents and polylactic acid (PLA) as substrate. The antimicrobial performance of PLA/CTAB/5-Cl8Q was the highest among the prepared materials, which inhabited S. aureus and E. coli up to 99.9% and 95.9%, respectively, and the antibacterial properties were stable. In general, PLA/CTAB/5-Cl8Q has great development potential, and it can be applied to real life as a cost-effective, biodegradable and highly antibacterial material.

Engineering of Multifunctional Nanocomposite Membranes for Wastewater Treatment: Oil/Water Separation and Dye Degradation.

Multifunctional membrane technology has gained tremendous attention in wastewater treatment, including oil/water separation and photocatalytic activity. In the present study, a multifunctional composite nanofiber membrane is capable of removing dyes and separating oil from wastewater, as well as having antibacterial activity. The composite nanofiber membrane is composed of cellulose acetate (CA) filled with zinc oxide nanoparticles (ZnO NPs) in a polymer matrix and dipped into a solution of titanium dioxide nanoparticles (TiO2 NPs). Membrane characterization was performed using transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and Fourier transform infrared (FTIR), and water contact angle (WCA) studies were utilized to evaluate the introduced membranes. Results showed that membranes have adequate wettability for the separation process and antibacterial activity, which is beneficial for water disinfection from living organisms. A remarkable result of the membranes' analysis was that methylene blue (MB) dye removal occurred through the photocatalysis process with an efficiency of ~20%. Additionally, it exhibits a high separation efficiency of 45% for removing oil from a mixture of oil-water and water flux of 20.7 L.m-2 h-1 after 1 h. The developed membranes have multifunctional properties and are expected to provide numerous merits for treating complex wastewater.

Preparation and characterization of deacetylated cellulose acetate/thermoplastic polyurethane nanofiber membranes modified with graphene oxide for methylene blue and Cr (VI) adsorption

AbstractDeacetylated cellulose acetate/thermoplastic polyurethane@graphene oxide (DA/TPU@GO) nanofibrous membranes were prepared through the combination of electrospinning, deacetylation, and ultrasound‐assisted surface treatment techniques. The morphology, wettability, and mechanical properties of composite nanofiber membranes were studied via SEM, TEM, water contact angle measurements, and mechanical tests. Moreover, the adsorption capacity and mechanism of DA/TPU@GO nanofiber membranes for methylene blue and chromium (Cr (VI)) were analyzed. The introduction of active sites from GO led to a significant increase in the adsorption capacity of the DA/TPU@GO composite membranes compared with the DA/TPU composite nanofiber. The composite membrane featured adsorption capacities of 152.7 mg/g (25°C, pH 3) and 122.1 mg/g (25°C, pH 7) for Cr (VI) and methylene blue, respectively, which are higher than most other composite GO‐based adsorbents. The adsorption mechanism of the DA/TPU@GO composite membrane was consistent with the Langmuir isotherm and second‐order kinetic models. Therefore, the DA/TPU@GO composite nanofiber membrane served as an effective adsorbent with broad application prospects in the sewage treatment field owing to its excellent adsorption capacity.Highlights Nanofibers were prepared for the absorption of methylene blue (MB) and Cr (VI). Nanofibers exhibited adsorption capacities of 152.7 and 122.1 mg/g for Cr (VI) and MB. Adsorption mechanism follows Langmuir isotherm and second‐order kinetic models. Nanofibers have wide potential applications in sewage treatment.

Flexible and MOF-808 uniformly assembled polyimide nanofiber membranes with excellent mechanical properties for rapid degradation of chemical warfare agents

Breathable and soft protective clothing with self-disinfection function is crucial for the practical application of protecting the human body from being killed by corrosive agents. Recent wars and terrorist attacks have motivated researchers to focus on efficient digestion materials as chemical warfare agents (CWAs). Zirconium-based metal–organic frameworks (Zr-MOFs) have been proven to efficiently digest CWAs. However, their powder form limits their application in personal protection. Uniformly and firmly anchoring Zr-MOFs onto fiber materials to form flexible protection fabrics remains a challenge. In this study, a polyimide nanofiber composite membrane loaded with MOF-808 with a cross-linked structure is prepared by combining electrospinning, thermal crosslinking, and the in-situ growth of pre-soaked Zr4+ seeds. The composite film shows excellent softness and mechanical properties with mechanical strength exceeds 20 MPa. Meanwhile, the uniform anchoring of the Zr-MOF on the fibers yields a high specific surface area (453 m2/g) of the composite membrane. In addition, the composite membrane can digest the mustard gas simulant, 2-chloroethyl ethyl sulfide, at a digestion efficiency of 90.9%. This simple and efficient solution provides a new method for the development of breathable, flexible, self-sterilizing materials, which are expected to be applied as protective materials against chemical warfare agents, for human body protection, and in other fields.

Hierarchical metal-organic framework-functionalized PVDF tree-like nanofiber membrane for high-efficient photothermal membrane distillation

The development of membrane with strong sunlight absorption and high energy efficiency is the key to improve the water production efficiency in photothermal membrane distillation (PMD). In this paper, a hierarchical Cu-based metal–organic framework-functionalized polyvinylidene fluoride (PVDF) tree-like nanofiber membrane (Cu-CAT@TLNM-TLNMs) was developed for high-efficient PMD. The Cu-CAT@TLNM-TLNM was prepared by in-situ growth of Cu-CAT on the surface of PVDF tree-like nanofiber membrane (TLNM) as photothermal layer and PVDF TLNM as support layer, which exhibited excellent photothermal conversion performance, high energy utilization and high permeate flux. The PVDF TLNM with high specific surface area provided more active sites for the growth of Cu-CAT, thus forming a uniform Cu-CAT nanoarray. The spinous structure of the Cu-CAT photothermal layer can increase the length of the light-matter interaction and improve light absorption. In addition, the tree-like structure of the support layer with high porosity and small pore size can improve the permeate flux and long-term stability. Under the illumination of 1 kW·m−2, the surface temperature of the Cu-CAT@TLNM-TLNMs reached about 80 °C within 50 s, with a permeate flux of 1.37 kg·m−2·h−1, a salt rejection of >99.99 %, and a photothermal conversion efficiency of 76 %. More importantly, the permeate flux of the Cu-CAT@TLNM-TLNMs was still stable at 0.79 kg·m−2·h−1 with a salt rejection of >99.99 % after 84 h of continuous operation. This photothermal nanofiber composite membrane can be applied to solve the problem of freshwater shortage in areas where freshwater and fuel resources are scarce and solar energy is abundant.

Nanofibrous membranes with hydrophobic and thermoregulatory functions fabricated by coaxial electrospinning

AbstractIn the face of changing outdoor environments, it is necessary for us to develop advanced textiles with thermal regulation and hydrophobic properties. In order to create a fabric with both temperature control and waterproof properties, the study adjusted the ratio of polystyrene (PS) and polyvinylidene fluoride (PVDF) to produce nanofiber membranes with excellent morphology and dirt resistant properties. Furthermore, the hydrophobicity of the nanofibers was further improved by adding SiO2 to the spinning solution. Based on this, a core solution of octadecane (Oct) was used to give it thermal regulation functionality through coaxial electrospinning technique. The resulting composite nanofiber membrane exhibited excellent hydrophobicity and thermal regulation performance. The measurement results obtained from Differential Scanning Calorimetry (DSC) indicate that the maximum Oct encapsulation rate of the PS/PVDF/SiO2@Oct nanofiber membrane is 58.36%. The latent heat of the composite nanofiber membrane is 148.84 J/g, and the water contact angle (WCA) is 135°. The multifunctional composite nanofiber has great potential for applications in outdoor protective clothing and outdoor electronic device protection.

Preparation and filtration performance of antibacterial PVDF/SiO2/Ag composite nanofiber membrane

Electrospinning nanofiber membrane has many advantages, such as high specific surface area, small pore size, high porosity, and good fibre uniformity, which makes it show excellent application potential in air filtration and personal protection. This study used an electrospinning method to create a PVDF/SiO2/Ag composite nanofiber membrane with superhydrophobic and antibacterial properties. It was deposited on the surface of PET fibre to create an air filter material with a sandwich structure, and its surface morphology, antibacterial properties, surface wettability, and filtration efficiency were studied. The results demonstrated that the adding of nanosilver significantly improved the antibacterial performance of the composite nanofiber membrane. In addition, the hydrophobic performance of the nanofiber membrane was significantly improved as the concentration of hydrophobic nano-SiO2 was increased. As a result, the PVDF/SiO2/Ag composite nanofiber membrane had a filtration efficiency of 99.94% for 0.3 μm particulate matter and a drag pressure drop of 112.3 Pa. Furthermore, the filtration efficiency of air microorganisms was greater than 99.99%, indicating a promising application in air filtration.

Preparation and application of polyacrylonitrile electrospun nanofiber-based all-solid-state composite electrolyte for lithium metal battery

The demand for lithium-ion batteries that are both safe and high-energy is growing. Liquid electrolytes are used in traditional lithium rechargeable batteries, which pose security hazards such as volatilization, flammability, and explosion. Most of the safety problems associated with liquid electrolytes could be addressed by solid-state electrolytes. This research firstly incorporated Li6.4La3Zr1.4Ta0.6O12 (LLZTO) ceramic nanoparticle filler into electrospun polyacrylonitrile (PAN) to obtain a composite nanofiber membrane, and then added it to polyethylene oxide (PEO) polymer as a nano-polymer filler to create an all-solid-state electrolyte. By incorporating the PAN/LLZTO composite nanofiber membrane, the resulting electrolyte gains a sturdy framework that enhances its overall mechanical strength (7.8 MPa) to prevent the growth of lithium dendrites during cycling. In addition, the addition of LLZTO particles can help promote chain segment motion in a PEO matrix by increasing the ratios of amorphous to crystalline phase, which is beneficial for the rapid migration of lithium ions in the electrolyte membrane. At the same time, the interaction between LLZTO and DMF solvent can also generate an alkaline atmosphere and then promotes the cyclization of PAN, thus enhancing the ionic conductivity of the electrolyte (6.5 × 10−5cm−1 at 30 °C). The Li/Li symmetric battery assembled with the PEO-PAN/LLZTO composite electrolyte can stable cycling for 800 h at different current densities, and the Li/LiFePO4 battery can still maintain a high Coulomb efficiency of 99.7% after even 400 cycles under 1C. The research will lead to a promising electrolyte candidate for all-solid-state lithium metal batteries.

Construction of proton transport channels in cross-linked composite membrane with highly sulfonated SPEEK nanofibers

A series of novel nanofiber composite proton exchange membranes were fabricated by embedding highly sulfonated poly (ether ketone) (SPEEK) nanofibers in a cross-linked SPEEK matrix, showing both high proton conductivity and excellent stability. Composite membranes were prepared with salt-form SPEEK nanofiber mats filled with acid-form SPEEK solution. After thermal treatment at 180 °C in the presence of dimethyl sulfoxide, the cross-linking reaction occurred in the acid-form SPEEK matrix but not in nanofibers. The dimensional stability, mechanical strength, and oxidative stability of the composite membrane were significantly improved due to thermal cross-linking treatment. The swelling ratio of all the cross-linked membranes was below 30% in hot water, and the maximum tensile strength reached 68 MPa. The nanofibers formed non-cross-linked regions and retained rich sulfonic acid groups to construct fast, long-range proton transport channels. The proton conductivity of the nanofiber composite cross-linked membrane reached 200 mS/cm exceeding the pristine cross-linked membrane (135 mS/cm). The fuel cell performance showed a peak power density of 485 mW/cm2 at 80 °C under 100% relative humidity.

Nanofibrous polycaprolactone/amniotic membrane facilitates peripheral nerve regeneration by promoting macrophage polarization and regulating inflammatory microenvironment.

Appropriate levels of inflammation are an important part of functional repair of nerve damage. However, excessive inflammation can cause the continuous activation of immune inflammatory cells and degeneration of nerve cells. Regulating the temporal and spatial changes in M1/M2 macrophages can regulate the local inflammatory immune environment of the tissue to promote its transformation to a direction conducive to tissue repair.In the present study, a multi-layer multifunctional nanofiber composite membrane of polycaprolactone(PCL) and amniotic membrane (AM) was constructed using electrospinning. In vitro studies have shown that the PCL/AM composite promoted the axon growth of SH-SY5Y cells and induced their differentiation into neurons. The PCL/AM composite wrapped the nerve stump to form a microenvironment that was conducive to nerve regeneration, blocked the invasion of scar tissue, promoted the recruitment of macrophages and moderate polarization to M2, enhanced the expression of anti-inflammatory factors IL-10 and IL-13, inhibited the expression of pro-inflammatory factors IL-6 and TNF-α, and induced myelin sheath and axon regeneration. By releasing various bioactive substances to regulate the polarization of M2 macrophages and formation of anti-inflammatory factors, the PCL/AM composite can enhance axonal regeneration and improve nerve repair.

Integrated flexible photocatalytic composite nanofiber membranes combined in-situ grown CQDs/g-C3N4 with thermally etched porous silica

In recent years, various semiconductor photocatalysts have been developed for wastewater treatment. However, traditional bulk photocatalysts suffer from powder agglomeration, difficult recovery, and secondary pollution, which hinders their large-scale application. Herein, the in-situ growth of carbon quantum dots/graphitic carbon nitride (CQDs/g-C3N4) was successfully achieved on flexible silica nanofiber membranes (SiO2 NFMs), which were synthesized by combining electrospinning with thermal polycondensation. It was found that the conversion of smooth membranes into porous surfaces due to the thermal etching effect of alkaline atmosphere during the creation of CQDs/g-C3N4, which not only facilitated the adsorption of tetracycline (TC), but also provided more active sites for photodegradation. Under visible light irradiation, the obtained CQDs/g-C3N4@SiO2 NFMs showed exceptional photocatalytic activity toward TC, with first order kinetic constants of 3.88 and 48.86 times greater than g-C3N4@SiO2 NFMs and SiO2 NFMs, respectively. The radical trapping experiments revealed that •O2−, 1O2, h+, and •OH were the active species in photocatalytic degradation. The photocatalytic degradation was evaluated under initial pH, inorganic anions, and natural aqueous substrate, which shows good applicability. In addition, CQDs/g-C3N4@SiO2 NFMs exhibited high stability and reusability. And the integrated composite membranes can be directly recovered from water after the immobilization of photocatalysts. To sum up, with the advantages of high photocatalytic activity, flexibility, easy separation, and recovery, CQDs/g-C3N4@SiO2 NFMs are prospective catalysts for practical applications in water remediation.

Electrospun Carboxymethyl Cellulose/Polyvinyl Alcohol Nanofiber Membranes for Enhanced Metal Ion Removal

Carboxymethyl cellulose (CMC)/polyvinyl alcohol (PVA) composite nanofiber membranes were prepared by electrostatic spinning, using CMC and PVA as raw materials and glutaraldehyde as a cross-linking agent. The structure, morphology, thermal stability, and filtration performance of CMC/PVA nanofiber membranes were characterized by advanced instrumental analysis methods such as scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, ultraviolet analysis, and energy spectrum analysis. The results show that the average fiber diameter decreases from 381 nm to 183 nm when the spinning voltage is 23 KV and the jet speed is 2 µL/min. The obtained fiber has the smallest particle size and the most uniform distribution. Infrared spectroscopy analysis confirms that the adsorption behavior of nanofiber membranes on Cu2+ and Cr6+ is chemical adsorption. The retention rates of CMC/PVA nanofiber membranes for Cu2+ and Cr6+ reached 97.2% and 98.8%, respectively. The adsorption capacities of Cu2+ and Cr6+ were 26.34 and 28.93 mg·g−1, respectively. The adsorption of heavy metal ions by nanofiber membranes can be explained by the pseudo-second-order kinetic mechanism of the chemisorption process and the Langmuir isotherm model.

Research on the synthesis of MgO nanorods (MgONRs) with surface nano textures and its load on nanofiber membranes

The purpose of this research was to obtain the composite nanofiber membranes with efficient antibacterial property using synthetic magnesium-based antibacterial agents. Based on the antibacterial mechanism of MgO nanoparticles (MgONPs), the MgO nanorods (MgONRs) with surface nano textures (M-SNT) were designed to increase the effective contact area of MgONRs and bacteria, which achieved an excellent antibacterial property. The effect of the calcination temperature on the surface nano textures morphological and the antibacterial property of the M-SNT were systematically researched. When the calcination temperature reached 600 °C (M-SNT6), the surface nano textures of M-SNT6 was uniform and the antibacterial property was the most excellent, and the antibacterial rate was better than that of the commercial MgONPs (C-M). The highly-effective antibacterial nanofiber membranes were fabricated by loading 2.5 wt% M-SNT6 on polycaprolactone/polyvinyl pyrrolidone (PCL/PVP) substrates through electrospinning technology, which presented excellent antibacterial rate of 100% against E. coli.

Flexible layered reduced graphene oxide/aramid nanofiber composite membrane with high thermal conductivity and mechanical properties

Aramid nanofiber films have shown great potential for high-performance batteries and flexible electronics due to their lightweight and excellent formability. However, aramid nanofibers’ inherent low thermal conductivity severely limits their further applications in high-power electronic devices. Therefore, we attempted to prepare ANF-based composites with excellent thermal conductivity by using reduced graphene oxide (rGO) as a thermally conductive filler for ANF. In this work, we prepared rGO/ANF composite films with horizontal laminar structures by chemical reduction, vacuum-assisted filtration, and hot-press drying. Compared with the pure ANF film (λ, 0.52 W mK−1), the thermal conductivity of the rGO/ANF composite film was greatly improved, and the thermal conductivity increased with increasing rGO content. 50 wt% rGO/ANF composite film achieved an in-plane thermal conductivity of 7.45 W mK−1, 1182.7% higher than the ANF film, and the tensile strength reached 81.7 MPa. Overall, our prepared rGO/ANF composite film exhibits excellent thermal conductivity and good mechanical strength, which helps to explore the potential and development of aramid nanofibres applications in electronic devices.