Si3N4 Nanowires Research Articles

In-Plane heterogeneous Structure-Boosted interfacial polarization in graphene for wide-band and wide-temperature microwave absorption

Theoretically, the strong permittivity dispersion characteristic of materials is essential for achieving broadband electromagnetic wave (EMW) absorption, which can be realized via amplified interfacial polarization effects between a dielectric phase and a lossy phase, such as by increasing the accumulated charge density in their interface area. Herein, we propose a novel strategy to boost interfacial polarization based on heterogeneous structure design in in-plane graphene (Gr) since the in-plane conductivity of Gr is significantly higher than its out-of-plane conductivity. To this end, Gr is grown on Si3N4 nanowires skeleton using chemical vapor deposition (CVD). Subsequently, Gr is controllably etched by Ni nanoparticles, and then, open graphite nanosteps are formed, which help construct in-plane heterogeneous interfaces between Gr and a dielectric phase. Such interfaces also help improve the impedance matching performance by disrupting the long-range conductive network of CVD-grown Gr. Notably, an effective absorption bandwidth of 8.48 GHz is achieved with a thickness of 2.85 mm, which is significantly wider than the EAB (5 GHz) of the out-of-plane heterogeneous structure. In addition, the in-plane heterogeneous structure also endows the EMW absorption material with excellent high-temperature insensitivity, realizing full-frequency absorption in the X-band in the 298–873 K range. This strategy to boost interfacial polarization via novel in-plane heterogeneous structure construction in Gr provides an alternative approach to explore the potential of Gr-based hybrids with planified structures to achieve wide-band and wide-temperature EMW absorption.

Tailoring Mechanical Properties of a Ceramic Nanowire Aerogel with Pyrolytic Carbon for In Situ Resilience at 1400 °C.

Resilient ceramic aerogels with a unique combination of lightweight, good high-temperature stability, high specific area, and thermal insulation properties are known for their promising applications in various fields. However, the mechanical properties of traditional ceramic aerogels are often constrained by insufficient interlocking of the building blocks. Here, we report a strategy to largely increase the interlocking degree of the building blocks by depositing a pyrolytic carbon (PyC) coating onto Si3N4 nanowires. The results show that the mechanical performances of the Si3N4 nanowire aerogels are intricately linked to the microstructure of the PyC nodes. The compression resilience of the Si3N4@PyC nanowire aerogels increases with an increase of the interlayer cross-linking in PyC. Additionally, benefiting from the excellent high-temperature stability of PyC, the Si3N4@PyC nanowire aerogels demonstrate significantly superior in situ resilience up to 1400 °C. The integrated mechanical and high-temperature properties of the Si3N4@PyC nanowire aerogels make them highly appealing for applications in harsh conditions. The facile method of manipulating the microstructure of the nodes may offer a perspective for tailoring the mechanical properties of ceramic aerogels.

Simultaneous optimization of mechanical and biotribological properties of carbon fibers reinforced hydroxyapatite-polymer composites by constructing networked Si3N4 nanowires

Carbon fibers reinforced hydroxyapatite-polymer composites (CHP) has greatly promising applications in the field of artificial joint replacement, where the integration of splendid biotribological properties and mechanical strength are demanded. Herein, silicon nitride nanowires (SN) with networked structure are introduced to CHP and used as reinforcement materials to form SN reinforced CHP (SN–CHP). The results show that SN with networked structure can provide more deposition sites for hydroxyapatite (HA), increase the cohesion of polymer matrix and strengthen the fiber/polymer interface bonding. With the introduction of SN, mechanical and biotribological properties of SN-CHP exhibit obvious promotion. The shear and compressive strengths of SN-CHP are increased by 28.1 % ± 8.7 % and 28.4 ± 3.8 % compared with CHP, respectively. Furthermore, the friction coefficient and wear rate are reduced by 23.9 % ± 4.3 % and 28.9 % ± 3.8 %, respectively. This work offers a perspective for the fabrication of composite materials with superior cohesion and interface bonding, showing promising applications in artificial joint.

Microstructure and mechanical properties of electroless Ni–P–Si3N4–TiN composite coatings

A high performance electroless Ni–P–Si3N4–TiN multi-nanocomposite coating was prepared on the surface of AZ31 Mg alloy. The results showed that the surface morphology of this multi-nanocomposite coating exhibits a uniform nodular structure, and the nodular size decreases clearly while increasing TiN nanoparticle concentrations to 2 g/L in the bath, resulting in the finest size of approximately 3 μm. Furthermore, the incorporation of TiN nanoparticles and Si3N4 nanowires into the Ni–P matrix can significantly enhance the microhardness and reduce the friction coefficient of the multi-nanocomposite coatings. The maximum hardness value of 921.4 HV200 and lowest friction coefficient of 0.54 as well as minimum wear weight loss of 0.7 mg can be also reached at a TiN nanoparticle concentration of 2 g/L.

One-step synthesis of single-crystal Si3N4 nanowires-amorphous SiO2 beads nanochains by chemical vapor deposition

One-dimensional (1D) nanochain heterojunctions have attracted wide attention due to their unique optical and electrical properties, while efficient and controllable synthesis of nanochains is still difficult. Herein, Si3N4/SiO2 nanochain heterojunctions (Si3N4 single-crystal nanowires and amorphous SiO2 beads) were successfully synthesized by a one-step chemical vapor deposition (CVD) process without using any templates and catalysts. A two-stage growth mode was proposed to explain the formation mechanism of the special nanochain. We found that carbon vapor induced the formation of Si3N4 nanowires and suppressed the formation of Si2N2O. The Si3N4/SiO2 nanochains can only be synthesized within a suitable concentration range of carbon vapor. The as-synthesized fascinating nanochain exhibits an extra strong emission at about 3.02 eV, showing great promise for optoelectronic nanodevices.

Effect of Si3N4 nanowires doping on microstructure and properties of Sn58Bi solder for Cu bonding

PurposeThe purpose of this study is to delve into the mechanism of Si3N4 nanowires (NWs) in Sn-based solder, thereby furnishing a theoretical foundation for the expeditious design and practical implementation of innovative lead-free solder materials in the electronic packaging industry.Design/methodology/approachThis study investigates the effect of adding Si3N4 NWs to Sn58Bi solder in various mass fractions (0, 0.1, 0.2, 0.4, 0.6 and 0.8 Wt.%) for modifying the solder and joining the Cu substrate. Meanwhile, the melting characteristics and wettability of solder, as well as the microstructure, interfacial intermetallic compound (IMC) and mechanical properties of joint were evaluated.FindingsThe crystal plane spacing and lattice constant of Sn and Bi phase increase slightly. A minor variation in the Sn58Bi solder melting point was caused, while it does not impact its functionality. An appropriate Si3N4 NWs content (0.2∼0.4 Wt.%) significantly improves its wettability, and modifies the microstructure and interfacial IMC layer. The shear strength increases by up to 10.74% when adding 0.4 Wt.% Si3N4 NWs, and the failure mode observed is brittle fracture mainly. However, excessive Si3N4 will cause aggregation at the junction between the solder matrix and IMC layer, this will be detrimental to the joint.Originality/valueThe Si3N4 NWs were first used for the modification of lead-free solder materials. The relative properties of composite solder and joints were evaluated from different aspects, and the optimal ratio was obtained.

Microstructure and orientation evolution of β-Sn and interfacial Cu6Sn5 IMC grains in SAC105 solder joints modified by Si3N4 nanowires

In this study, Si3N4 nanowires (NWs) with ceramic properties were incorporated into Sn1.0Ag0.5Cu (SAC105) solder to enhance its overall performance. The thermal properties, spreading behavior, microstructure, interface, and mechanical properties of SAC105-xSi3N4 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0 wt%) solders were systematically investigated. The research revealed that doping Si3N4 NWs into SAC105 solder could expand its melting range and decrease undercooling. Notably, the solder alloy containing 0.6 wt% Si3N4 NWs had the lowest thermal expansion coefficient (CTE), which improved the CTE matching of SAC105 solder with Cu substrate. Although the solder with 0.4 wt% Si3N4 NWs exhibited superior wetting properties, it was less effective in refining the microstructure and interfacial intermetallic compounds (IMC) than those containing 0.6 wt% Si3N4 NWs. Meanwhile, when the β-Sn phase in the matrix and the Cu6Sn5 IMC phase at the interface were analyzed by electron back scatter diffraction (EBSD), their grain orientation was found to be optimized by the doping of 0.6 wt% Si3N4 NWs. The <001> direction of the β-Sn grains of SAC105-0.6Si3N4 was perpendicular to the Cu substrate, showing a texture structure. The grain orientation of the interfacial Cu6Sn5 IMC made it well-adapted for three-dimensional (3D) packaging. Finally, the mechanical properties enhancement of the solder joints were analyzed in detail by combining the fracture morphology and the EBSD results of the Sn matrix.

Enhanced In-Plane Thermal Conductivity and Mechanical Strength of Flexible Films by Aligning and Interconnecting Si3N4 Nanowires.

As the rapid development of advanced foldable electronic devices, flexible and insulating composite films with ultra-high in-plane thermal conductivity have received increasing attention as thermal management materials. Silicon nitride nanowires (Si3N4NWs) have been considered as promising fillers for preparing anisotropic thermally conductive composite films due to their extremely high thermal conductivity, low dielectric properties, and excellent mechanical properties. However, an efficient approach to synthesize Si3N4NWs in a large scale still need to be explored. In this work, large quantities of Si3N4NWs were successfully prepared using a modified CRN method, presenting the advantages of high aspect ratio, high purity, and easy collection. On the basis, the super-flexible PVA/Si3N4NWs composite films were further prepared with the assistance of vacuum filtration method. Due to the highly oriented Si3N4NWs interconnected to form a complete phonon transport network in the horizontal direction, the composite films exhibited a high in-plane thermal conductivity of 15.4 W·m-1·K-1. The enhancement effect of Si3N4NWs on the composite thermal conductivity was further demonstrated by the actual heat transfer process and finite element simulations. More significantly, the Si3N4NWs enabled the composite film presenting good thermal stability, high electrical insulation, and excellent mechanical strength, which was beneficial for thermal management applications in modern electronic devices.

Study on the interfacial evolution and mechanical properties of Cu/SAC105/Cu solder joint modified by Si3N4 nanowires

In the present study, Si3N4 nanowires (NWs) with a mass fraction of 0.6 wt% were incorporated into Sn1.0Ag0.5Cu (SAC105) solder. Cu/SAC105/Cu and Cu/SAC105-Si3N4/Cu 3D structure joints were constructed by transient liquid-phase (TLP) bonding. To investigate the influence mechanism of Si3N4 NWs, the interfacial IMC evolution and mechanical properties of two solder joints were analyzed. It was found that the interfacial Cu3Sn IMC layer thickness of the joints containing Si3N4 NWs was thinner than that of the undoped ones at any given time. The growth of interfacial Cu6Sn5 IMC was inhibited, resulting in the retarded formation of interfacial IMC bridging and full-IMC joints. In addition, combined with the fracture morphology analysis, the brittle fracture behavior of the solder joints was suppressed, and the shear strength of the joints showed a significant improvement following the introduction of Si3N4 NWs. Moreover, Si3N4 NWs were found exposed on the fracture surface of Cu3Sn IMC layer, demonstrating that the doping of Si3N4 NWs shaped a joint similar to that of reinforced concrete structure, which facilitates the limitation of dislocations and crack expansion.

Fire-resistant and hydrophobic paper based on Si3N4@PDMS core-shell nanowires with 3D interlocking structure

Paper with simultaneous fire-resistance and hydrophobicity have greatly potential applications in the fields of packing, storage and delivering information, which attracts increasing attention recently. Different from the traditional cellulose-based paper which is extremely easily damaged by water and fire, a new type of highly flexible, fire-resistant and hydrophobic paper based on Si3N4 nanowires and polydimethylsiloxane (PDMS) is reported. Specially, the Si3N4@PDMS core-shell nanowires with 3D interlocking structure are designed, in which the Si3N4 nanowires act as the inorganic fire-resistant frameworks and the PDMS shell with low surface energy provides the hydrophobic surface. The Si3N4@PDMS core-shell nanowires are intertwined and interlaced to form a highly flexible Si3N4@PDMS paper. The tensile strength of Si3N4@PDMS paper is 6.19 MPa, indicating the good mechanical property. The obtained Si3N4@PDMS paper has the characteristics of writability, fire-resistance and hydrophobicity. The high thermal stability of Si3N4 nanowires makes Si3N4@PDMS paper exhibit excellent fire resistance. No obvious change is observed for the commercial paper with Si3N4@PDMS paper as the fire-shielding layer after heating for 30 min. In addition, the contact angles of water droplets are all greater than 110° over the surfaces of Si3N4@PDMS paper after mechanical damages, chemical corrosions and thermal treatments. Si3N4@PDMS paper can be used in oil/water separation and oil collection. More importantly, Si3N4@PDMS paper can be used for writing without being damaged by fire or water. The present work may inspire the development and application of functional paper and is expected to become a breakthrough in the traditional paper industry.

Synchronously constructing networked Si3N4 nanowires and interconnected graphene inside carbon fiber composites for enhancing mechanical, friction and anti-ablation properties

1 Binary reinforcements of networked Si 3 N 4 nws and interconnected GE in carbon fiber composites were constructed. 2 Networked Si 3 N 4 nws are uniformly distributed among the carbon fibers, while interconnected GE is firmly rooted on the surface of both networked Si 3 N 4 nws and carbon fiber. 3 Robust mechanical strength, excellent friction performances and outstanding anti-ablation properties of composites are realized. Carbon fiber (C f ) reinforced pyrolytic carbon (PyC) composites simultaneously possessing robust mechanical strength, excellent friction performances and outstanding anti-ablation properties are demanded for advanced aerospace applications. Efficient architecture design and optimization of composites are prominent yet remain high challenging for realizing the above requirements. Herein, binary reinforcements of networked silicon nitride nanowires (Si 3 N 4 nws) and interconnected graphene (GE) have been successfully constructed into C f /PyC by precursor impregnation-pyrolysis and chemical vapor deposition. Notably, networked Si 3 N 4 nws are uniformly distributed among the carbon fibers, while interconnected GE is firmly rooted on the surface of both networked Si 3 N 4 nws and carbon fibers. In the networked Si 3 N 4 nws and interconnected GE reinforced C f /PyC, networked Si 3 N 4 nws significantly boost the cohesion strength of PyC, while GE markedly improves the interface bonding of both Si 3 N 4 nws/PyC and fiber/PyC. Benefiting from the synergistic reinforcement effect of networked Si 3 N 4 nws and interconnected GE, the C f /PyC have a prominent enhancement in mechanical (shear and compressive strengths increased by 119.9% and 52.84%, respectively) and friction (friction coefficient and wear rate reduced by 25.40% and 60.10%, respectively) as well as anti-ablation (mass ablation rate and linear ablation rate decreased by 71.25% and 63.01%, respectively). This present strategy for networked Si 3 N 4 nws and interconnected GE reinforced C f /PyC provides a dominant route to produce mechanically robust, frictionally resisting and ablatively resistant materials for use in advanced aerospace applications.

Thermal insulating and fire-retardant Si3N4 nanowire membranes resistant to high temperatures up to 1300 °C

Superior thermal insulating and fire-retardant ceramic membranes are urgently demanded in the aerospace, construction, and chemical engineering industries. However, the generic characteristics of ceramic membranes, such as brittleness, structural collapse, and crystallization-induced pulverization behavior, present a great plague to their practical applications. Herein, we report a highly flexible, mechanically stable, fire-retardant, and high-temperature-resistant ceramic membrane based on the interlocked Si3N4 nanowires formed by the precursor pyrolysis method. The Si3N4 nanowire membrane (SNM) has excellent high-temperature resistance under alcohol lamps and butane spray lance. The thermal insulation with a thermal conductivity as low as 0.056 W m–1 K–1 can be attributed to the high porosity of SNM, which makes it a desirable candidate for heat insulators under harsh conditions. More importantly, SNM exhibits thermal stability and robust mechanical properties in the range of 25 to 1300 °C. The high-temperature resistance of SNM up to 1300 °C is achieved by the four stages: Si3N4 nanowires, Si3N4@SiO2 nanowires, SiO2 nanowires, and bead-like SiO2 nanowires. After heat-treated at 1300 °C, the macroscopic size of SNM does not change significantly, and the interlocked structure is still maintained. Furthermore, SNM still maintains excellent mechanical properties, with tensile strength as high as 0.26 MPa. This work provides a facile method for fabricating excellent thermal insulating and fire-retardant ceramic membranes, showing prospective application prospects in the era of thermal insulating materials.

High-temperature oxidation behaviour of si3n4 nanowires with different diameters

?-Si3N4 nanowires with diameters of 100-180 nm (Si3N4-W1) and 420-510 nm (Si3N4-W2) were synthesized by a modified chemical vapour deposition (CVD) method and their microstructure changes after high-temperature oxidation were studied. The results showed that both Si3N4 nanowires were not significantly oxidized when the temperature was lower than 900?C. However, the Si3N4-W1 microstructure began to change significantly after oxidation at 1200?C, while the Si3N4-W2 microstructure remained almost unchanged. Moreover, the Si3N4- W1 and Si3N4-W2 nanowires oxidized significantly after treatment at 1400?C, with weight gain of 26.4% and 13.7%, respectively.

Large-scale synthesis of Si3N4 nanowires by a modified carbothermal reduction method using graphite felt as growth substrate

In this work, silicon nitride nanowires (Si3N4NWs) were successfully prepared by a modified carbothermal reduction method, using graphite felt as a growth substrate and in the absence of the catalysts. The synthesized Si3N4NWs exhibited smooth surface, uniform morphology and high aspect ratios. The high purity and high crystallinity of Si3N4NWs were confirmed by XRD, XPS, etc. More importantly, the vapor–solid (VS) growth mechanism of Si3N4NWs was proposed. It is indicated that the graphite felt played a crucial role in increasing the proportion of the gas-phase reaction to obtain large-scale Si3N4NWs. The Si3N4NWs produced by this approach have the advantages of high yield, high purity and low cost, which are very prospective for application.

Compact, High Extinction Ratio, and Low-Loss Polarization Beam Splitter on Lithium-Niobate-On-Insulator Using a Silicon Nitride Nanowire Assisted Waveguide and a Grooved Waveguide

We propose a compact, high extinction ratio, and low-loss polarization beam splitter (PBS) on a lithium-niobate-on-insulator (LNOI) platform, based on an asymmetrical directional coupler and using a silicon nitride nanowire assisted waveguide (WG) and a grooved WG. By properly designing Si3N4 nanowires and grooved LN WGs, TE polarization meets the phase matching condition, while significant mismatching exists for TM polarization. Numerical simulations show that the PBS has an ultra-high extinction ratio (ER) of TE0 and TM0 (larger than 40 dB and 50 dB, respectively). The device extinction ratios are larger than 10 dB over 100 nm wavelength ranges. Moreover, the device has an ultra-low insertion loss (IL less than 0.05 dB) at the wavelength of 1550 nm and maintains ILs less than 0.4 dB over 100 nm wavelength ranges.

Synthesis of rare earth doped Si3N4 nanowires with excellent luminescence properties by plasma-assisted direct nitridation method

Si 3 N 4 nanowires doped with rare earth ions (such as Ce 3+ , Tb 3+ , Eu 2+ and Eu 3+ ) were synthesized by plasma assisted direct nitridation method using Si, rare earth oxides and N 2 as raw materials. The prepared doped Si 3 N 4 nanowires were characterized by XRD, EDS, XPS, SEM and TEM. The obtained single-crystal doped Si 3 N 4 nanowires have uniform diameters of about 50–100 nm and lengths of more than 10 µm. The photoluminescence (PL), PL decay curves as well as thermal quenching behaviors of doped Si 3 N 3 nanowires were systematically investigated. This work provides an effective strategy for doping large-size functional atoms in Si 3 N 4 nanowires. • Rare earth doped Si 3 N 4 nanowires were synthesized by a direct nitridation method. • Rare earth doped Si 3 N 4 nanowires have excellent luminescence properties. • The luminescence peaks of doped Si 3 N 4 nanowires are related to the doping type.

Site-directed capture of laccase at edge-rich graphene via an interfacial hydrophobicity effect for direct electrochemistry study

Direct electrochemistry of oxidoreductase on electrode plays critical roles in the development of enzymatic biosensing and biofuel cells. Herein, a free-standing edge-rich graphene (ERG) film in-situ fabricated on a porous and conductive Si3N4 nanowires template with hydrophobic surface was directly used as a self-supporting electrode for site-directed capture of laccase from Agaricus bisporus. The ERG film possessed abundant edge-rich active sites, high conductivity, and especially hydrophobic surface, which realized the direct electron transfer of the immobilized laccase and its bioelectrocatalysis towards the O2 reduction. With the comprehensive comparison to hydrophilic ERG, we found that the interfacial hydrophobicity played an important role for the orientated immobilization of laccase. Thereafter a faster electron transfer kinetic (1.32 vs. 0.74 s−1) and a higher bioelectrocatalytic activity towards O2 with over 10 times’ enhancement in reductive current were achieved. This is probably because the hydrophobic region of laccase tends to specifically interact with the hydrophobic surface, allowing the site-directed capture of laccase on the hydrophobic ERG electrode. With an emphasis of the interfacial hydrophobicity effect, these results would not only contribute to an in-depth understanding of the nano-bio interface electron transfer, but also provide a new insight to design high-efficient bioelectrodes for biosensors and biofuel cells applications.

Synchronously promoted mechanical and biotribological properties of carbon fiber composites by constructing Si3N4 nanowires@pyrolytic carbon intertwined network

Constructing strong interaction architecture is the key to achieve high performance of composite materials, where the combination of high mechanical strength and excellent biotribological properties are required. Herein, Si3N4 nanowires@pyrolytic carbon core-shell structure (SNs@PyC) are designed and constructed into carbon fiber-carbon-hydroxyapatite composites (CHC) for improving the mechanical and biotribological performances. SNs@PyC enhanced CHC (SNs@PyC-CHC) are fabricated by a combined method composed of precursor impregnation-pyrolysis, chemical vapor deposition, pulse electrochemical deposition and isothermal chemical vapor infiltration. SNs@PyC are distributed inside CHC uniformly with intertwined network structure. SNs@PyC induces the uniform deposition of hydroxyapatite matrix, favors the infiltration of the carbon matrix, enhances the interface between carbon matrix and Si3N4 nanowires, and promotes the cohesion strength of the carbon matrix. Compared with CHC, the flexural strength, compressive strength and shear strength of SNs@PyC-CHC are increased by 63%, 47% and 300%, respectively. In addition, the friction coefficient and wear rate of SNs@PyC-CHC are decreased by 55% and 84%, respectively. SNs@PyC-CHC may have a promising application in biomedical.

Effect of reaction temperature on formation of α-Si3N4 nanowires by a simple CVD method

[Formula: see text]-Si3N4 nanowires were formed by a simple chemical vapor deposition (CVD) method using Si and SiO2 as raw materials without the addition of metal catalyst. The effect of reaction temperature on the phase composition and morphologies of the nanowires were analyzed by XRD and SEM. The experimental results indicate that a suitable reaction temperature is essential for the final products. At 1400[Formula: see text]C, small amount of target products were obtained, and some irregular particles were attached on the surfaces of nanowires. When the temperature increased to 1450[Formula: see text]C, the nanowires were mainly composed of [Formula: see text]-Si3N4 phase, they had smooth surfaces with diameters fluctuating from 50 to 200 nm and lengths from hundreds to thousands of microns. At further high reaction temperature (1500[Formula: see text]C), [Formula: see text]-Si3N4 phase was observed and the nanowires had larger diameters, this was negative for obtaining purity [Formula: see text]-Si3N4 nanowires. The growth process of [Formula: see text]-Si3N4 nanowires was dominantly governed by the vapor–solid mechanism.

Free-standing Si3N4 nanowires@pyrolytic carbon membranes decorated with metal oxide nanoarrays for flexible hybrid supercapacitors

To satisfy the increasing requirement of flexible energy storage devices, various free-standing flexible conductive substrates were developed to construct high-performance supercapacitor electrodes. In this work, free-standing, flexible and conductive Si3N4 nanowires (NWs)@pyrolytic carbon (PyC) membrane, served as nanoscale substrate, was fabricated by a two-step chemical vapor deposition (CVD) method. NiCo2O4 nanosheets (NSs) and Fe2O3 nanorods (NRs) were finally grown on Si3N4NWs@PyC membrane substrates, which were directly served as the positive and negative electrodes, respectively. The membrane electrodes possesss the structural advantages, such as the interwoven network structure of nanowires substrates and array structure of active materials, which guarantee the excellent electrochemical performance of electrodes. Additionally, the flexible solid-state hybrid supercapacitor (HSC) assembled by Si3N4NWs@PyC@NiCo2O4NSs and Si3N4NWs@PyC@Fe2O3NRs, delivered a high energy density of 74.3 Wh kg−1 at a power density of 0.8 kW kg−1, excellent cycling stability (Capacitance retention of 84.6% after 4000 cycles), and good flexibility. Impressively, this work provides a new thinking about the structural design of high-performance supercapacitor electrodes as well as expands the application field of ceramic nanowires macrostructures.