Effective Absorption Band Research Articles

Hierarchical waxberry-like V2O3@Co/Co3O4/Ni absorbers with remarkable microwave absorption via regulation of magnetic and dielectric loss

The design of microwave absorbers with hierarchical architectures are garnering increasing attention, but the regulation of the dielectric/magnetic loss remains a challenge. Herein, waxberry-like V2O3@Co/Co3O4/Ni (VCN-x) absorbers are fabricated by hydrothermal and annealing process, with magnetic Co/Co3O4/Ni uniformly riveted on the surface of V2O3 microspheres. The morphological evolution of Co/Co3O4/Ni, including nanoparticles, nanosheets, and nanoflowers, was modified by introducing different content of Co and Ni particles. This enrichment the multiple heterogeneous interfaces leads to an enhancement in interfacial polarization. This enhancement is attributed to the internal core-double shell structure, abundant intrinsic defects, and multiple interfaces, VCN-x absorbers exhibit remarkable microwave absorption (MA) performance and a broad effective absorption band (EAB). The enrichment of multiple heterogeneous interfaces leads to an enhancement in interfacial polarization. This enhancement is attributed to the internal core-double shell structure, the presence of abundant intrinsic defects, and the existence of multiple interfaces within VCN-x absorbers. As a result of these structural characteristics, VCN-x absorbers demonstrate exceptional MA performance and exhibit a broad EAB. At a thickness of 2.26 mm, the minimum reflection loss (RLmin) is −59.6 dB. By varying the matching thickness between 1.60 mm and 2.26 mm and by adjusting the EAB from 3.8 GHz to 6.8 GHz, the EAB of VCN-x absorbers can encompass the CKu band.

3D Printing of Liquid‐Metal‐in‐Ceramic Metamaterials for High‐Efficient Microwave Absorption

AbstractThis work reports a gallium indium alloy (EGaIn)‐doped SiBOC ceramic that possesses a unique liquid‐metal‐in‐ceramic feature. The low‐viscosity liquid nature of gallium‐based liquid metals (Ga‐LMs) and the reactive core‐shell structure provide possibilities for phase engineering inside polymer‐derived ceramics. As a demonstration, EGaIn nanoparticles (NPs) are directly mixed with a UV‐curable ceramic precursor (UV‐PBS) to obtain a resin suitable for digital light processing 3D‐printing. After pyrolysis at 800–1200 °C, SiBOC ceramics with uniformly distributed EGaIn NP domains (Si(GaIn)BOC) are obtained. EGaIn plays a key role in promoting carbonization and preventing crack formation during the polymer‐to‐ceramic process, resulting in an increase in both ceramic yield and mechanical strength. EGaIn NPs are also found to have a core‐shell structure (EGaIn@(GaxIn1‐x)2O3@SiBOC) inside the SiBOC matrix, which significantly enhances the dielectric properties and improves the interfacial polarization. As a result, an excellent electromagnetic wave absorption performance is achieved across the C, X, and Ku bands, respectively. Through rational design, a novel metastructure design based on the Schwarz P minimal surface is proposed, which exhibits an ultrawide effective absorption band extending up to 11.36 GHz (within C‐Ku bands).

Preparation of fluorinated carbon nanotube with heterogenous fluorine pattern and the electromagnetic response

The heterogeneous interface structures are widely recognized for the favorable impact on optimizing microwave absorption (MA) properties of microwave absorbers. However, the facile construction of heterogeneous interface and deep exploration of the electromagnetic response is challenging. Herein, we presented an approach of direct fluorination utilizing F2/N2 to construct heterogenous interface on single walled carbon nanotubes (SWCNTs), and the electromagnetic effect was disclosed. By molecular fluorination, fluorinated SWCNTs with heterogeneously aggregated fluorine pattern (M-CNTs-F) were fabricated. The aggregated fluorine pattern on M-CNTs-F lead to stronger polarization loss strength compared to pristine SWCNTs and the discrete-fluorine pattered sample, as well as gradual prolongation of relaxation time (τ) with increase of fluorine content. Consequently, M-CNTs-F demonstrates superior MA property with minimal reflection loss (RLmin) and effective absorption band (EAB) value of −49 dB and 5.6 GHz at 1.76 mm with filler content only 2 wt%. Surprisingly, M-CNTs-F also exhibit preferable low frequency MA performance. Based on aforementioned foundations, M-CNTs-F were furtherly architected to construct CNT-contained composite foam, achieving RLmin and EAB value of −66 dB and 10.36 GHz, respectively. Our study highlights the superiority of direct fluorination in constructing heterogeneous interface, and emphasizes the critical role of heterojunction pattern in MA modification.

Constructing honeycomb-like hierarchical foam via electromagnetic cooperation strategy for broadband microwave absorption

The application of wireless electronic devices inevitably leads to electromagnetic pollution. Three-dimensional porous foam structures have been shown to be an effective strategy to construct high-performance microwave absorbers. Herein, the honeycomb-like hierarchical foams were fabricated via melamine-formaldehyde (MF) foam as substrate coupled with flaky carbonyl iron (CI)-MXene lamellae. Inside the synthesized composite foam, flaky CI is interlaced into MXene nanosheets to form hierarchical structures, which effectively alleviates the originally self-stacking phenomenon and provides numerous heterogeneous interfaces, resulting in the optimization of impedance matching. In addition, owing to the construction of consecutive electromagnetic networks, the CI-MXene/MF foams exhibit significant dielectric loss and magnetic loss capability. Moreover, the honeycomb-like structure offers multiple reflections/scattering for electromagnetic waves, which effectively prolongs the transmission paths, further improving the microwave attenuation ability. Hence, the synthesized composite foam exhibits superior microwave absorption performance with a minimum refection loss of −61.4 dB and a maximum effective absorption band of 7.18 GHz. The construction of unique microstructure and regulation of electromagnetic components is demonstrated to be feasible strategies for the design of efficient microwave absorbers in future.

Soft matter with magnetically oriented macro - micro structure for improving microwave absorption efficiency

The key challenge for the most widely used magnetic absorbers is how to simultaneously combine low filling with efficient electromagnetic absorption performance. This paper exploited carbonyl iron particles (CIPs) to develop some soft material that possessed orderly orientated structure via applying an external excitation signal, so as to reduce hyperosmotic threshold of conductive loss network, improve impedance matching pattern and thus modulate absorption efficiency. The arch test results showed that effective absorption band (EAB, RL<−10 dB) and reflection loss (RL) efficiency of oriented structure (40 wt%−300mT sample) was much higher than that of unoriented structure (60 wt%−0mT sample), and the reflection loss intensity was reduced to − 15.2 dB, especially EAB was expanded by 8.1 GHz, which significantly alleviated the critical conflict between low filling and electromagnetic loss performance. Also, it was attempted to reveal surface topography changes caused by multiple magnetized particles interaction, and how excitation signal intensity, magnetic particles filling concentration and structural parameters affect microwave absorption efficiency and bi-directional frequency conversion. Thus, a magnetic-manipulated absorbing material proposed laid a theoretical foundation for improving loss efficiency of magnetic materials at low filling concentration.

Lotus Leaf Derived NiS/Carbon Nanofibers/Porous Carbon Heterogeneous Structures for Strong and Broadband Microwave Absorption.

Developing composite materials with the synergistic effects of heterogeneous structures and multiple components is considered as a promising strategy to achieve high-performance electromagnetic wave (EMW) absorbers. To further satisfy the demand of broadband and strong microwave absorption, a novel NiS/carbon nanofibers (CNFs)/porous carbon composite is successfully synthesized by hydrothermal and chemical vapor deposition using lotus leaves as a biomass carbon source. A few carbon nanotubes (CNTs) and uniformly dispersed Ni nanocrystals have also been found in the hybrid. Benefiting from the porous structure derived from lotus leaves, the combination of dielectric NiS, conductive carbon nanomaterials, and magnetic Ni nanoparticles, together with the three-dimensional conductive network of CNFs and CNTs, the remarkable EMW absorption properties with a minimum reflection loss up to -67.65 dB have been achieved at merely 2.32 mm. Besides, the widest effective absorption band can reach 5.9 GHz with a thin thickness of 2.07 mm, covering almost the entire Ku band. In addition, under the incident angle of 31°, the radar cross-section reduction value of LNSF-600 can reach 42.88 dBm2. Therefore, this work provides an efficient and facile method for manufacturing outstanding biomass-derived EMW absorbers.

Confined dissipation cage in dual-shell structured Ti3C2Tx@CNTs/Ni hollow spheres for lightweight and broadband electromagnetic wave absorption

Ti3C2Tx can dissipate energy well due to its high conductivity, but at the expense of severe electromagnetic (EM) wave reflection, which is exacerbated by self-stacking. Despite various attempts to tackle this problem, the excessive isolation of Ti3C2Tx and massive high-density inorganic components render these designs unfavorable for lightweight and broadband absorption. Meanwhile, improvements in absorption performance are related to active surface and polarization interface expansion, as well as conductive path reconstruction, but the main contributing factor remains unknown. In this work, the dual-shell structured Ti3C2Tx@CNTs/Ni-HS (hollow sphere) composites are fabricated. This structure creates a confined dissipation cage, where the CNTs/Ni shell confines the electron transfer among spheres and prevents self-restacking and the tightly contacted Ti3C2Tx shell forms an uninterrupted conductive path for effective dissipation. Therefore, Ti3C2Tx@CNTs/Ni-HS-1 exhibits a broad effective absorption band of 6.1 GHz and a minimum reflection loss of −64.6 dB at a mass ratio of only 15 wt%. Importantly, when hollow structure cracks, although large active surface and polarizable interface remain, the absorption capacity of fragmented Ti3C2Tx@CNTs/Ni-HS-1 deteriorates, indicating rational conductive path in confined dissipation cage is the main factor in achieving excellent performance. This work provides new insight for the rational design of high-performance absorbers.

2D/2D Mo0.74W0.26S2/Ti3C2 MXene for microwave absorption with broad effective absorption band

Transition metal dichalcogenide MoS2 is considered as a type of dielectric loss dominated electromagnetic wave absorbing material owing to the high specific surface area, layered structure, and lightweight. Introduction of interfaces will improve the electromagnetic wave absorbing performance. Here, the phase engineering of MoS2 is realized through W doping since of the microstrain effect, resulting in the appearance of 2H/1T MoS2 phase interface. Furthermore, MoS2/Ti3C2 MXene interface is realized through the construction of MoS2/Ti3C2 MXene heterostructure, leading to obvious improvements in electromagnetic wave absorbing. Because of the simultaneous introduction of 2H/1T MoS2 phase interface and the MoS2/Ti3C2 MXene interface, the microwave reflection loss can reach −45.2 dB with broad effective absorption bandwidth (&amp;lt;−10 dB) of 7.1 GHz (7.8–14.9 GHz) at the same thickness of 3 mm. The results shed light on enhancing electromagnetic wave absorbing performance by phase engineering as well as construction of two dimensional material/two dimensional material heterostructures, thereby introducing multiple interfaces.

Mild synthesis of flower-like CuS modified MXene nanocomposites for high-performance supercapacitors and efficient microwave absorption

Benefiting from rich surface functional groups, two-dimensional transition metal carbides (MXene) exhibit excellent metallic conductivity, hydrophilicity and film-forming properties and are widely used in energy storage and microwave absorption. However, the agglomerate and stacking of MXene nanosheets during preparation are largely detrimental to the full realization of their merits at two-dimensional scale. Therefore, we developed an ultrasonic assisted and vacuum filtration method to obtain MXene/CuS thin film electrode material with a "sandwich" structure without destroying its inherent properties, which still maintains a good lamellar structure and exhibits excellent tensile properties. Due to the synergistic effect of MXene and CuS and their redox reaction, the MXene/CuS thin film electrode exhibits a specific capacitance of 491 F g−1 at a current density of 1 A g−1. It can be used directly as positive and negative electrodes to assemble a flexible supercapacitor with a capacitance retention of 89 % at current density of 2 A g−1 after 5000 cycles. In addition, the composite can achieve an effective absorption band width of 3.3 GHz (14.7–18 GHZ) at a thickness of 1 mm. The study shows that layer spacing modulation offers the possibility of large-scale applications of MXene in the field of flexible supercapacitors and microwave absorption, and provides new ideas for the development of multi-purpose materials to meet the needs of different applications.

Embedment of hollow SiO2 spheres into flower-like Ti3C2Tx MXene framework with decoration of carbon for efficient microwave absorption

With the advancement of modern microwave communication technologies, the development of lightweight absorption materials with high capacity and a wide absorption bandwidth has aroused great interest. Despite its low density, strong temperature resistance, high strength, and great electromagnetic energy storage capacity, SiO2 still has a long way to go in terms of efficiently dissipating microwaves due to its low polarization loss and conductive loss. Herein, the 3D sandwich-like M-Ti3C2Tx @SiO2 @C hybrids are synthesized by inserting SiO2 hollow spheres into the flower-like Ti3C2Tx MXene framework and decorating with carbon. SiO2 hollow spheres securely attached on monolayer Ti3C2Tx MXene nanosheets provide large electromagnetic energy storage capacity as well as additional interfacial polarization. The 3D flower-like Ti3C2Tx MXene framework and carbon coating ensure high conductive loss. The 3D sandwich-like M-Ti3C2Tx @SiO2 @C hybrids shows excellent microwave absorption performance. Under 40 wt% filler loadings, the 3D sandwich-like M-Ti3C2Tx @SiO2 @C hybrids deliver minimum reflection loss of − 43.97 dB at 4.5 mm thickness. At 1.5 mm thickness, their effective absorption band expands to 4.12 GHz. The facile and scalable synthesis strategy offers a novel design concept for the commercialization of high-performance microwave absorbers.

The interface charge transfer induced the expanding of effective electromagnetic wave absorption band in Ti3C2/FeNi3 composites

Ti3C2/NiFe2O4 and Ti3C2/FeNi3 composites were prepared by hydrothermal and hydrazine reduction process, respectively. Effects of components and surface functionalization on dielectric/magnetic polarization of samples were studied systematically. The results indicate that the surface charge states of Ti3C2 effectively modify the dielectric performance of the corresponding samples. In Ti3C2 sheets sample, the effective absorption bandwidth (EAB) is over 2.88 GHz at thickness of 0.93 mm. In Ti3C2/NiFe2O4 composite, the EAB is about 3.92 GHz at 1.92 mm thickness. In case of Ti3C2/FeNi3 composite, its EAB exceeds 5.68 GHz at 1.59 mm thickness. Such significantly improved wave absorption performance is attributed to the additional strong interface electromagnetic loss and the optimized impedance matching. In particularly, the additional polarization induced by the charge transfer between the heterogeneous interfaces in Ti3C2/FeNi3 composite has drastic positive effects on realizing multimode synergistic attenuation of the electromagnetic energy. This work demonstrates that Ti3C2/FeNi3 composite is a novel advanced absorbent with a promising application.

Self-assembly of submillimeter porous structure on metal-organic framework to construct heterogeneous interface for controlling microwave absorption

Metal organic frameworks (MOFs) attract more research in electromagnetic wave absorption due to their special microstructure. However, the micro/nano pore structure is not conducive to electromagnetic wave (EMW) entering the materials. Herein, three-dimensional ZnOCo@C with submillimeter porous structure are prepared by one-step thermal expansion of MOFs. Co is introduced into the preparation of zinc-based MOFs for co-coordination, thus ZnOCo heterogeneous interface is constructed. Therefore, the synergistic effect of magnetic loss and dielectric loss enhances microwave absorption performance of ZnOCo@C. Through heterogeneous interface construction and structural regulation, ZnOCo@C exhibits an ultra-width effective absorption band of 6.12 GHz, and the minimum reflection loss reaches −46.77 dB at 8.9 GHz. The results show that the existence of submillimeter hole structure is conducive to the entry of GHz electromagnetic wave, and the synergistic effect with ZnOCo heterostructure enhances the electromagnetic wave loss of ZnOCo@C. In addition, radar cross simulation can be reduced to 24.36 dB m2 and the RCS value is completely lower than −16.32 dB m2 in the range of −70° to 70°. This work provides a novel idea for the structural design and composition adjustment of MOFs-based EMW absorbing materials.

Large aspect ratio makes high low-frequency microwave absorption performance via a unique roll grinding method for flake FeSiAl

Increasing aspect ratio for flake magnetic alloy to facilitate microwave absorption capability in low-frequency is highly desired but remains changes by conventional methods. Here we report a unique roll grinding method to fabricate flake FeSiAl alloys with large aspect ratio of 40–100, which is beyond the limit of traditional ball milling method (< 40). As a result, such roll ground flake FeSiAl obtains a 3 times larger low frequency reflection loss (RL= −56.2 dB at 3.47 GHz) than that of ball milled one. Furthermore, the fabricated microwave absorber shows an ultra-wide effective absorption band of 14 GHz (RL < −20 dB, 2.3–16.3 GHz) with the thin coating thickness of 1.6–6.0 mm. Further analysis showed its exceptional properties stem from large aspect ratio induced satisfied impedance matching, enhanced magnetic loss, and intense dielectric loss. Our findings provide an easy industrial preparation method for making flake magnetic alloys that possess unconventional and technologically important electromagnetic properties.

Ambient-drying to construct unidirectional cellulose nanofibers/ carbon nanotubes aerogel with ultra-lightweight, robust, and superior microwave absorption performance

Microwave absorption materials (MAMs) with lightweight wide effective absorption band, superb mechanical performance, and capable of large-scale preparation are highly desirable for dealing with microwave pollution, but it is still a challenge to realize these performances simultaneously on one material. Herein, we report an ambient drying and non-chemical cross-linking way of preparing high-performance microwave absorption aerogels from cellulose nanofibers (CNF) and carbon nanotubes (CNT). Anisotropic aerogel pore walls with excellent mechanical properties can be constructed by unidirectional cycling freeze-thaw to cross-linking CNF and CNT. During this process, a sustainable bioinspired dual-networks interpenetrating strategy is constructed by benefiting from the mono-dispersion of CNF and CNT, thus enabling the creation of hybrid dual-networks of hydrophobic/hydrophilic nanofibers. Impressively, it is found that the dual-networks induced anisotropic aerogel structure and dense pore walls can synergistically result in favorable mechanical properties. In detail, aerogels with tunable ultralow densities (0.0262–0.0296 g cm−3), high mechanical properties (the stress of the sample reaches up to 329.8 kPa at 75% strain) and low shrinkage (∼10%) can be prepared. Besides, the aerogels behave a large-scale production future (diameter of aerogel up to 9.24 cm). The as-prepared aerogel delivers a remarkable minimal reflection loss (RLmin) of −60.22 dB at 13.012 GHz and a wide effective absorption bandwidth (EAB) from 2.163 to 18 GHz (15.84 GHz) at a thin thickness of 7.46 mm, which covers almost all the S, C, X, and Ku bands. This work provides a strategy to prepare lightweight and efficient microwave absorbers, as well as illustrates good impedance matching and moderate dielectric loss capability.

Enhanced electromagnetic wave absorption, thermal conductivity and flame retardancy of BCN@LDH/EP for advanced electronic packing materials

The limited functionalization of current electronic packaging materials has restricted their use in advanced smart electronic devices with high energy density and low signal delay. In this study, we propose a novel strategy for developing an electronic packaging material (BCN@LDH/EP) that possesses exceptional electromagnetic wave (EMW) absorption, thermal management, and flame-retardant capabilities. BCN@LDH/EP is the double-level hollow core–shell structure (BCN@LDH) composed of a bowl-shaped carbon nanoshell (BCN) and a layered double hydroxide (NiAl-LDH). This structure offers rich heterogeneous interfaces and high specific surface area, thereby generating abundant polarization sites and favorable impedance matching. Consequently, the epoxy resin (EP) shows outstanding EMW absorption performance, with a maximum effective absorption band (EAB) of 6.43 GHz and a minimum reflection loss (RL) value of −55.75 dB at a filling amount of only 10 wt%. Moreover, the closely packed thermally conductive filler BCN@LDH provides a broad pathway for heat transfer within the EP, resulting in a significant thermal conductivity improvement efficiency (η) of ∼170%. Notably, the high-temperature cooling and barrier effects of BCN@LDH also confer excellent flame retardancy to the EP composite, reducing the total heat release (THR) rate by up to 44.9%.

A compact broadband absorber based on helical metasurfaces

Owing to the pronounced wave-matter interaction at resonance, meta-absorbers show impressive potentials for eliminating low-frequency sound even at thicknesses far below the corresponding wavelength. For a meta-absorber, a traditional way of achieving broadband low-frequency absorption is to piece together a graded bank of tuned resonators side by side, while this eventually leads to a growing size as more and more elements are combined. Here, we present a broadband absorber built up by detuned resonators in a compact manner. By leveraging the space-coiling concept, the absorber features a remarkable reduction in thickness, while, owing to the way that elements twisting around each other, the absorber further shows compactness in surface area. Simulations and experiments on a proof-of-concept prototype reveal an effective absorption band ranging from 299 to 623 Hz with a thickness of just 52 mm (around 1/22 of the lowest working wavelength). Given that the effective sound path in a meta-unit can be continuously adjustable by the helical pitch, our investigations offer a compact way for broadband yet customizable noise absorption. More essentially, given that wave-matter interaction is heavily dependent on the surface's impedance while the perfect absorption suggests an extreme impedance modulation (matched-impedance modulation), our work suggests a compact approach towards on-demand acoustic impedance engineering in broadband.

Hierarchical and Porous Structures of Carbon Nanotubes-Anchored MOF Derivatives Bridged by Carbon Nanocoils as Lightweight and Broadband Microwave Absorbers.

High-performance microwave absorption (MA) materials have attracted more and more attention because they can effectively prevent microwave radiation and interference from electronic devices. Herein, a new type of MA composite is constructed by introducing carbon nanotubes (CNTs)-anchored metal-organic framework derivatives (MOFDs) into a conductive carbonnanocoil (CNC) network, denoted as CNC/CNT-MOFD. The CNC/MOFD shows a wide effective absorption band of 6.7GHz under a filling ratio of only 9% in wax-matrix. This is attributed to the hierarchical and porous structures of MOFD bridged by the uniformly dispersed conductive CNC network and the cross-polarization induced by the 3D spiral CNCs. Besides, the as-grown 1D CNTs improve space utilization, porosity, and polarization loss of the composites, resulting in the increase of imaginary permittivity, which further realizes impedance matching and energy attenuation. The Ni nanoparticles in layers of MOFD and at the tips of CNTs generate magnetic loss, promoting the low-frequency absorption ability. Resultantly, RCS values of the optimized composite in all tested theta (θ) ranges are less than -25dB m2 at 9.5GHz, effectively reducing the probability of the target detected by the radar.

Biomass-based Co/C@Carbon composites derived from MOF-modified cotton fibers for enhanced electromagnetic attenuation

Recently, highly efficient electromagnetic attenuation materials are crucial for the development of modern electronics and telecommunications. Meanwhile, biomass-derived carbon materials have attracted widespread attention due to their availability and renewable characteristics. In this study, a composite with Co/C particles embedded in carbon networks was synthesized by pyrolysis of cotton fiber coated with ZIF-67, which are showing tunable and higher electromagnetic interference (EMI) shielding effectiveness (SE) than pure carbon networks. The remarkable performance originated from the aligned carbon networks and the Co/C particles connected by the carbon networks. The former can achieve the regulation of EMI SE by changing the angle between the fiber orientation direction and the direction of the incident EM-wave electric field, while the latter can play a role in catalytic graphitization and enhance the shielding performance. When decreasing the pyrolysis temperature and filling the composite powder with 30 wt% in the paraffin matrix, the minimum reflection loss (RLmin) can reach −58.8 dB at 5.12 mm. In addition, the effective absorption band (EAB) of the composite can cover the C-Ku band by adjusting the thickness from 3 to 7 mm. This work provides a potential guideline for efficient biomass-based electromagnetic attenuation materials.

PPyNT/NR/NBR Composites with Excellent Microwave Absorbing Performance in X-Band.

To meet the comprehensive demand for flexible microwave absorbing (MA) materials, a novel MA rubber containing homemade Polypyrrole nanotube (PPyNT) is produced based on the natural rubber (NR) and acrylonitrile-butadiene rubber (NBR) blends. To achieve the optimal MA performance in the X band, the PPyNT content and NR/NBR blend ratio are adjusted in detail. The 6 phr PPyNT filled NR/NBR (90/10) composite has the superior MA performance with the minimum reflection loss value of -56.67 dB and the corresponding effective bandwidth of 3.7 GHz at a thickness of 2.9 mm, which has the merits in virtue of achieving strong absorption and wide effective absorption band with low filler content and thickness compared to most reported microwave absorbing rubber materials over the same frequency. This work provides new insight into the development of flexible microwave-absorbing materials.

Enhancement of sound absorption performance of Helmholtz resonators by space division and chamber grouping

Sound absorption performance of the Helmholtz resonator was enhanced by space division and chamber grouping in this research, which aimed to achieve high sound absorption coefficient and broad absorption band simultaneously. Based on acoustic finite element simulation, it could be found that the effective sound absorption frequency band of multiple divided Helmholtz resonators shifted to high frequency direction and the effective absorption bandwidth rose gradually with the increase of division number Ns from 1 to 24, and the effective sound absorption band of multiple divided and grouped Helmholtz resonators with the certain division number Ns would shift to the high frequency direction gradually and its width was improved normally with the increase of grouping number Gs. Moreover, the multiple divided and grouped Helmholtz resonators with division number Ns = 18 and grouping number Gs = 6 was optimized for the certain practical demand, and the optimal geometric parameters were obtained by the joint simulation method incorporating the finite element simulation and the cuckoo search algorithm. Furthermore, its actual sound absorption coefficients were obtained through sample fabrication by the additive manufacturing and standing wave tube measurement by the AWA6290T, and all the actual sound absorption coefficients in 400–800 Hz were above 0.8 and the average value in this range was up to 0.8729 with limited total thickness of 40 mm. Enhancement of the sound absorption performance of multiple divided and grouped Helmholtz resonators would be favorable to promote the practical applications of acoustic metamaterials in the noise reduction field.