Nanomaterials
·
2022
·Vol. 12
·期 20
·3699
·
IF 5.719
Congyi Qian,Xiaohui Liang,Mei Wu,Xingxin Zhang
A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe3O4and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of Fe3O4and rGO was produced by a hydrothermal method under an applied magnetic field. The electromagnetic loss property of the Fe3O4@rGO composites is studied in the frequency range from 2 to 18 GHz. In addition, the reflection loss and the mechanism of microwave absorption are explored. By changing the amounts of rGO, the electromagnetic loss of the Fe3O4@rGO composites can be effectively regulated, which obtain better reflection loss. The minimum reflection loss of the Fe3O4@rGO composites is −49.4 dB at 16.2 GHz only with a thickness of 1.75 mm. Thus, the Fe3O4@rGO composites have an extremely thin thickness and a strong electromagnetic wave absorption capacity, which is a candidate for the development of lightweight magnetic absorbing materials.Keywords:magnetic composites;microwave absorption;electromagnetic loss;lightweight
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 2
·771-778
·
IF 2.5
Li Mengmeng,Xu Qiuyu,Jiang Wei,Farooq Amjad,Qi Yirui,Liu Lifang
Herein, Fe 3 O 4 nanoparticles and graphene oxide (GO) are compounded first, followed by the addition of cellulose nanofiber (CNF) and l -ascorbic acid, to obtain Fe 3 O 4 @reduced graphene oxide (rGO)/CNF foams via the freeze-drying method. The electrical conductivity and magnetism of as-prepared foams were improved due to the presence of rGO and Fe 3 O 4 , which is suitable for electromagnetic interference (EMI) shielding material. The results exhibit that Fe 3 O 4 @rGO/CNF foams all possess a porous structure, and the optimized foam shows an EMI shielding effectiveness value of ~ 23 dB in the X-band. The good EMI shielding performance of the Fe 3 O 4 @rGO/CNF foam originates from the synergy of its composition and structure. This work could provide a reference for the design and fabrication of novel EMI shielding materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Xin Zhang,Zhicheng Mao,Jijun Ding,Haixia Chen
The iron tetroxide/reduced graphene oxide/stearic acid (Fe 3 O 4 /RGO/SA) composite membrane with a micro-nano-graded rough structure is fabricated on cotton cloth. Surface morphology , crystal structure, infrared spectra , and contact angle are tested to analyze the microstructure and wettability properties of the composite membrane. Compared with the original cotton, the composite membrane is changed from superhydrophilic to superhydrophobic , the water contact angle reached 156.1°, and it has stable superhydrophobicity at different pH values (pH = 5, 6, 7, 8, 9). A series of oil-water separation experiments show that the separation efficiency of composite membrane for four oil-water mixtures is higher than 98.4%, the results of the cycle separation test show that the separation efficiency and flux test for 10 cycles did not appear measurably fluctuations, the separation efficiency has always been maintained above 98%. In addition, the membrane can absorb oil slick on the water surface by magnetic drive, which provides a new idea for contactless manipulation of oil removal.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Mao Shen,Wei Li,Fengzao Chen,Lei Chen,Yuxiang Chen,Suqing Chen,Shibin Ren,Deman Han
Bisphenol A (BPA) is a potential endocrine-disrupting compound with adverse effects on both human health and the environment. Therefore, it is urgent to develop a convenient, sensitive and accurate method for BPA detection. In this paper, a ratiometric electrochemical sensor for BPA detection was developed using Ag@Fe 3 O 4 -rGO composite modified glassy carbon electrode (GCE), with the peak oxidation current of silver nanoparticles (NPs) in the material as the reference signal and the peak oxidation current of BPA as the indicator signal. The Ag@Fe 3 O 4 -rGO composite was prepared by a simple one-step solvothermal method. Due to the chemical functionality and two-dimensional structure, the rGO combined with Ag@Fe 3 O 4 core–shell NPs provides an excellent platform for BPA detection. The morphology, structure and electrochemical performance of Ag@Fe 3 O 4 -rGO composite were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and electrochemical techniques. The proposed ratiometric electrochemical BPA sensor shows the linear detection range of 0.1–10.0 µM (R 2 = 0.997), with detection limit of 0.028 μM (S/N = 3), good selectivity, reproducibility and stability. In addition, this proposed ratiometric electrochemical sensor was successfully verified in the detection of BPA in real water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Haopeng Cai,Chaochao Feng,Hongbo Xiao,Bo Cheng
Due to the pressing need for electromagnetic interference and radar stealth, microwave absorbers have garnered considerable attention. Through chemical co-precipitation and in-situ polymerization, we synthesize a ternary composite containing reduced graphene oxide , Fe 3 O 4 with flower-like nanostructures , and polyaniline (PANI). To fine-tune the impedance matching and corrosion resistance of composite materials, the conductive PANI was densely coated on the surface of reduced graphene oxide (rGO)/flower-like Fe 3 O 4 (f-Fe 3 O 4 ). The ternary composite exhibits excellent microwave absorption performance. In comparison to rGO/f-Fe 3 O 4 (1:10), which has a minimum reflection loss (RL min ) of −32.81 dB at 10.61 GHz and a 5.15 GHz effective absorption bandwidth (EAB) (7.34–12.49 GHz), rGO/f-Fe 3 O 4 (1:10)@PANI has an RL min of −46.49 dB at 9.93 GHz with a 2.5 mm thickness and an EAB of 4.25 (8.90–13.15 GHz). The results indicate that the addition of the PANI anticorrosion coating layer has no discernible effect on the final microwave absorption performance. This article also examines the effect of rGO weight ratio on microwave absorbing properties. When the rGO content is too high, the impedance will be mismatched, while the too low rGO content will affect the absorbing performance. This research work has contributed to our present understanding of the structure design and composition control of microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Zhiyuan Wang,Libo Wang,Shihao Cui,Dejian Xu,Hui Wang,Honghao Liu,Haipeng Zhang,Ning Gong,Qingshan Zhao,Mingbo Wu
Pd-based catalysts play a pivotal role in nitroaromatic hydrogenation for fine chemical synthesis, yet their intrinsic overactivity often undermines target selectivity. In this study, we develop a highly efficient and magnetically recoverable Pd/Fe3O4–rGO catalyst for nitroaromatic hydrogenation through dual-support interfacial engineering, realized by precisely anchoring Pd nanoparticles at the heterojunctions of ferrosoferric oxide and reduced graphene oxide (Fe3O4–rGO). The dual-support modulation effect not only ensures uniform Pd distribution via strong interfacial interaction but also drives directional charge transfer from Pd to the Fe3O4–rGO composite support, synergistically enhancing nitro group adsorption and optimizing H2 dissociation kinetics. The prepared Pd/Fe3O4–rGO catalyst achieves exceptional catalytic performance with 99% conversion and >97% selectivity for the chemoselective hydrogenation of diverse nitroaromatics under mild conditions while maintaining remarkable activity/selectivity over multiple cycles. Notably, the integrated Fe3O4 component facilitates efficient magnetic separation (<2 min), demonstrating industrial viability for continuous processes. This work provides a rational dual-support strategy that simultaneously regulates spatial configuration and electronic states of active sites to overcome the activity-selectivity trade-off in hydrogenation catalysis.
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 20
·期 1
·414-421
·
IF 4.123
Jie Ni,Jinjuan Xue,LinFang Xie,Jing Shen,Guangyu He,Haiqun Chen
Magnetic NiAl layered doubled hydroxide (LDH)/Fe3O4–RGO composites were successfully synthesized via a simple hydrothermal route. The as-prepared samples were well characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The results showed that NiAl LDH nanoplatelets and Fe3O4 nanoparticles sized around 15 nm were uniformly anchored on the surface of graphene sheets. The NiAl LDH/Fe3O4–RGO25 photocatalyst was employed to degrade ciprofloxacin (CIP) in an aqueous solution under visible light irradiation. It exhibited enhanced photocatalytic activity compared to pure NiAl LDH, the degradation rate of the as-prepared NiAl LDH/Fe3O4–RGO25 was 1.5 and even 3 times faster than that of NiAl LDH/RGO25 and pure NiAl LDH, respectively. This enhancement of photocatalytic activity is attributed to the addition of graphene and Fe3O4 NPs, which both efficiently promote the separation of charge carriers and improve the optical absorption properties, synergistically facilitating the photocatalysis process. Furthermore, the NiAl LDH/Fe3O4–RGO25 photocatalyst was magnetically separable and exhibited stable catalytic activity, which is beneficial to its practical application.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 20
·4527
·
IF 3.057
Hui Liu,Ling Li,Xinxin Wang,Guangzhen Cui,Xuliang Lv
A novel CoS@Fe3O4@rGO aerogel with a unique 3D porous heterostructure was prepared via the solvothermal method, in which cobalt sulfide (CoS) microspheres embedded with Fe3O4nanoparticles were randomly scattered on reduced graphene oxide (rGO) flakes. The introduction of magnetic Fe3O4nanoparticles and rGO regulated the impedance matching, and the excellent electromagnetic wave (EMW) absorption capability of the CoS@Fe3O4@rGO aerogel could be attributed to optimal dielectric loss and abundant conductive networks. The results demonstrated that the minimum reflection loss (RL) value of CoS@Fe3O4@rGO aerogel was −60.65 dB at a 2.5 mm coating thickness with an ultra-wide bandwidth of 6.36 GHz (10.24–16.6 GHz), as the filler loading was only 6 wt%. Such a lightweight CoS@Fe3O4@rGO aerogel with an outstanding absorbing intensity and an ultra-wide effective absorption bandwidth could become a potential EMW absorber.Keywords:microwave absorption;rGO aerogel;CoS;porous structure
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Yong Luo,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Well dispersed Fe 3 O 4 nanoparticle suspensions with grain size of about 9 nm were coprecipitated and then compounded with different amount of GO (graphite oxide) followed by reduction of GO to obtain Fe 3 O 4 /rGO (reduced graphite oxide) composites with different component ratios. The as-obtained Fe 3 O 4 /rGO composites were used as anode materials for lithium ion batteries to investigate the best component ratio of the composite for the cycling performance. Fe 3 O 4 /rGO composite electrode containing 44.9 wt% Fe 3 O 4 displayed the best cycling capacity of above 300 mA h g −1 at 1000 mA g −1 after 100 cycles and it was interesting to find that the trend of impedance spectra of Fe 3 O 4 /rGO electrodes after some cycles of electrochemical reactions can be well related to the overall cycling performances.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xunzhi Deng,Ze Liao,Jing Lu,Haiou Li,Xianxin Zhu,Yilin Liu,Qinyao Li,Danyi Deng,Chao Huang,Zhoufei Luo
The presence of alkylphenolic residues in vegetables could pose a potential food safety risk for humans. The residues of alkylphenols in bean sprouts have not been reported. Magnetic dispersion solid phase extraction (MD-SPE) followed by ultra performance liquid chromatography-tandem mass spectrometry was developed for detecting alkylphenol residues in sprouts. The Fe 3 O 4 @rGO@poly 3-aminophenol composite was first synthesized and used as an effective and regenerate adsorbent for MD-SPE. This method features minimal use of organic reagents, high extraction efficiency, easy recovery via magnetic separation, and the reusability of the adsorbent. The magnetic composite was characterized using X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. For optimization of the extraction process, the Plackett-Burman factorial design was employed to to fine-tune multiple parameters of MD-SPE. Additionally, the sensitivity of UPLC-MS/MS enabled the precise quantification of alkylphenols in the sprout samples. This analysis yielded high linearities (R 2 > 0.9989) and recoveries (90.4 %–108.5 %) at three different spiked levels. a minimal matrix effect (7.5 %–12.4 %), impressive limits of detection (0.89–13.62 pg/mL), and reliable reproducibility (intra-day: 2.0 %–13.5 %; inter-day: 0.7 %–11.6 %) were obtained. Thus, a new method was successfully employed for analyzing alkylphenolic residues in vegetables samples, making it a valuable tool for ensuring food safety.
研究领域:
食品安全
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MRS Energy & Sustainability
·
2024
·
IF 3.3
Oubla M’hamed,Idrissi Siham,Edfouf Zineb,Dinia Selma,Elouadi Brahim
Abstract The growing request of enhanced lithium-ion battery (LIB) anodes performance has driven extensive research into transition metal oxide nanoparticles, notably Fe 3 O 4 . However, the real application of Fe 3 O 4 is restricted by a significant fading capacity during the first cycle, presenting a prominent challenge. In response to this obstacle, the current research centers on the development of Fe 3 O4@rGO (with rGO is reduced graphene oxide) nanocomposite through a new two-step soft sol–gel method, incorporating a slight proportion of rGO. This targeted approach aims to resolve issues linked to the electrochemical stability of Fe 3 O 4 anode. The structure and morphological characterizations techniques confirmed the spinel crystalline structure of Fe 3 O 4 as well as the distinctive aggregate morphology of the nanoparticles, highlighting a regular arrangement of rGO-coated nanoparticles. The lithium-ion storage properties of the Fe 3 O 4 @rGO anode were examined through exhaustive electrochemical analyses. A minor irreversible capacity stands out as a particularly noteworthy feature in the Fe 3 O 4 @rGO anode. This characteristic is of paramount interest, given that the anode exhibits high specific capacity along with a high cycling stability and an outstanding rate capability. These remarkable outcomes can be directly linked to the superior morphological characteristics attained through the two-step sol–gel method. Graphical Abstract
Highlights
The Fe 3 O 4 @rGO nanocomposite, resulting from a novel two-step mild sol–gel method, exhibits a unique and promising structure for LIB technologies.
Regarding storage performance as an anode, the prepared nanocomposite exhibited a minor irreversible capacity, high reversible capacity, as well as good coulombic efficiency.
The incorporation of rGO improved the electrical conductivity and played a crucial role in facilitating Li-ion diffusion, overcoming challenges associated with volume changes during the cycling process.
Discussion
Transition metal oxide (TMO)-based anodes hold promise for future LIB technologies owing to their substantial theoretical capacities. However, the material’s tendency to expand dramatically during use, leading to electrode deterioration and capacity fade. To address this challenge, researchers have explored incorporating rGO into TMO composites.
rGO’s unique properties, including high conductivity and mechanical flexibility, effectively mitigate volume expansion and enhance electrochemical performance. The two-step soft sol–gel method could be a promising solution for fabricating rGO-TMO nanocomposites. However, further optimization and large-scale fabrication are necessary for practical applications.
Despite these challenges, the combination of TMOs and rGO could create high-performance and durable anodes for LIB. Further research should focus on optimizing material composition and fabrication processes to realize the full potential of this technology.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3287-3300
·
IF 4.21
Zhang Su-Feng,Li Hao,Hou Chen,Liu Li-Na,Wang Yang,Zhao Meng-Ke,Liang Chen
Abstract The treatment of dyes in wastewater is important to solve environmental problems. Advanced oxidation processes has been proved to be an effective treatment. In this work, a novel nanocomposite catalyst of ZIF-9@Fe 3 O 4 (cobalt-containing zeolitic imidazolate framework-9 coated Fe 3 O 4 nanocomposite) modified reduced graphite oxide (RGO) was prepared for the first time and coded as ZIF-9@CA-Fe 3 O 4 /RGO. Then, ZIF-9@CA-Fe 3 O 4 /RGO was immobilized on a cellulose membrane to obtain a composite membrane, which was used as a composite catalyst for activating peroxymonosulfate to degrade methylene blue (MB). The results demonstrated that the composite membrane could efficiently degrade approximately 96% of MB in 9 min without adjusting the initial pH and maintain good catalytic activity even after seven cycles. Furthermore, the composite membrane can be easily separated from the solution at the end of the reaction. This work indicates that the composite membrane has a broad application prospect in industrial applications. Graphic abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）