JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Yuan Shu,Tingkai Zhao,Weiyu Jia,Lei Yang,Xianghong Li,Guyue Feng,Yatao Li,Fa Luo
The combination of magnetic and dielectric materials followed by appropriate structure design is an effective approach to achieve high electromagnetic wave absorption properties. Here, crosslinked Co@CoO/reduced graphene oxide nanohybrids (CCRGO) were fabricated via a simple three-step method. The experimental results show that compared with previous works, the as-prepared CCRGO nanohybrids achieve higher electromagnetic wave absorption and broader effective bandwidth at a lower filler loading. The electromagnetic parameters and electromagnetic wave absorption performance could be apparently adjusted by controlling the adding content of graphene oxide (GO) and the reduction temperature. Among a series of samples, CCRGO3-650 nanohybrid yields the best electromagnetic wave absorption performance benefiting from the proper GO addition and reduction temperature. At a filler loading of 20 wt%, the maximal reflection loss reaches to −64.67 dB at a thickness of 2.53 mm and the effective bandwidth below −10 dB covers the whole X band at a thickness of 2.51 mm. The good performance may be ascribed to the advantages of the dielectric and magnetic component as well as the special crosslinked structure, which triggers a synergistic absorption mechanism including multiple reflection/scattering, interface polarization, dipole polarization, conductive loss, eddy current loss, exchange resonance in the electromagnetic wave dissipation process. The good electromagnetic wave absorption performance affirms the potential application of CCRGO nanohybrids in the field of stealth materials.
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DIAMOND AND RELATED MATERIALS
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2023
·
IF 4.1
Shiqi Zhang,Peidong Ling,Yi Chen,Jun Liu,Chun Yang
Herein, 2D/2D porous Co 3 O 4 nanosheets/rGO composites modified GCE (Co 3 O 4 /rGO/GCE) were proposed for electrochemical detection of tryptophan (Trp). The surface morphology and structure of Co 3 O 4 /rGO nanosheets were carried out using SEM, XRD , and Raman spectra . Electrochemical performance of Trp on as-synthesized modified electrodes were discussed by CV and EIS techniques. Moreover, the best electrochemical property was also investigated by varying test condition detailedly. Consequently, oxidation peak intensity and current density were 130.3 μA and 336.7 μA·cm −2 on Co 3 O 4 /rGO/GCE at working potential of 0.78 V ( vs. SCE electrode), respectively. They were more than 23-times greater than these on bare GCE in electrochemical detection of Trp. It was attributed to the synergy effect of 2D porous Co 3 O 4 nanosheets (high catalytic activity) and 2D rGO nanosheets (large electrochemical active area). After the optimization, wide linear determination ranges (from 1.0 to 800 μM) and low LOD of 0.26 μM (S/N = 3) were acquired. In addition, these electrodes were further successfully applied to the determination of Trp in commercial amino acid injection samples. This 2D porous Co 3 O 4 /rGO modified GCE sensor could provide a slight view on the design of 2D/2D composite materials with high electrochemical properties.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xiaoju Wang,Shanshan Hu,Haitao Mao,Xueyu Wei,Saraschandra Naraginti
In the recent past, the development of efficient materials for degradation and detoxification of antibiotics has gained more attention in wastewater treatment process . As a visible light active material AgVO 3 has attracted much concern in environmental remediation. To improve its efficiency and stability, a novel heterojunction was prepared by combining AgVO 3 with rGO and BiVO 4 through a hydrothermal method. The prepared AgVO 3 /rGO/BiVO 4 composite was further utilized for effective detoxification of Norfloxacin (NFC) antibiotic. The morphological analysis revealed the clear rod shaped AgVO 3 and leaf like BiVO 4 that are evenly distributed on reduced graphene oxide (rGO) layers. The visible light absorbance and the catalytic activity of AgVO 3 /rGO/BiVO 4 was dramatically improved compared to pure AgVO 3 and BiVO 4 . From the results it showed that the degradation efficiency of AgVO 3 /rGO/BiVO 4 (∼96.1%, k = 0.01782 min −1 ) was 2.5 times higher than pure AgVO 3 and 3.4 times higher than the pure BiVO 4 respectively towards NFC after 90 min. The higher efficiency could be attributed to the heterojunction formation and faster charge separation. The radical trapping experiments results indicated that the •OH, and O 2 •− are the main species responsible for degradation. The degradation products of NFC were analysed through ESI-LC/MS and pathway was proposed. Furthermore, the toxicity assessment of pure NFC and its degradation products was studied using E. coli as the model bacteria through colony forming unit assay and the results indicated the efficient detoxification was attained during the degradation process. Thus, our study provides new insight into detoxification of antibiotics using AgVO 3 based composites
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhenming Wang,Lanxiu Ni,Xiaobo Zhang,Liang Feng
To alleviate the lack of sensors on the Internet of Things (IoT), a novel flexible substrate-free sensing membrane has been put forward, of which the fabrication is simple, low-cost and has potential of large-scale production via a vacuum filtration method. After alkaline hydrolysis , paper fibers were covered with reduced graphene oxide (rGO) and further functionalized with a layer of polyaniline (PANI) by in-situ polymerization. The rGO functionalized fiber (GF) played a competent role as the embedded conductive network, efficiently transferring the charge signal from the surface sensing layer. Eventually, the functionalized fibers were re-filmed under a 0.1 MPa negative pressure by vacuum filtration method. The surface area of the film was about 23.76 cm 2 and 1 × 1 cm 2 square was cut for the following test. The sensing membrane based on PANI covered rGO functionalized fiber (PGF) has shown superb sensing performance to NH 3 , with excellent stability, selectivity and sensitivity at room temperature . The linear response range of sensor based on PGF was 25 ppm, the correlation coefficient was 0.9908 and the limit of detection (LOD) was 34 ppb. The response to NH 3 was ∼14% while the responses of other testified interfering gases were all below 0.5%. Most importantly, the sensing membrane has exhibited an excellent capability of resisting bending, and maintained the response to 10 ppm NH 3 (13.55–14.3%) even after 1200 bends, indicating that the sensor has a bright prospect of future wearable applications.
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Journal of Nanomaterials
·
2019
·
IF 2.233
Lei Cheng,Youjun Fan,Xingcan Shen,Hong Liang
A hybrid and hierarchical nanocomposite was successfully prepared by the growth of zeolitic imidazolate framework-8 (ZIF-8) on the template of ionic liquid (IL, [Bmim][BF4]) functionalized reduced graphene oxide (IL-RGO). The structure and morphology of the IL-RGO/ZIF-8 nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and Raman spectroscopy. The results showed that RGO sheets were refrained from restacking by IL, and ZIF-8 nanoparticles grew well on the surface of IL-RGO. Owing to the synergistic effect from large surface area and excellent electrocatalytic activity of ZIF-8 and great electrical conductivity of IL-RGO, a highly sensitive sensor for dopamine (DA) can be obtained. IL-RGO/ZIF-8-modified electrode exhibits good electrocatalytic activity and electroconductive properties towards DA which were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Compared with bare or IL-RGO-modified electrodes, the IL-RGO/ZIF-8-modified electrode effectively depressed the oxidation overpotential of DA. The linear response range of DA was from to with a low detection of limit . In addition, the sensor was shown to provide satisfactory stability for the determination of DA.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Huan Wang,Zicheng Xiao,Zhifeng Yu,Yuntian Ma,Pingfan Wu,Fumin Xue,Wei Guo,Wangda Lu,Xinxin Jiao,Peng Jiang,Minghui Liang
To develop iron-based materials for energy storage is an important issue because of their low cost, abundant storage and high theoretical specific capacitances. Fe(OH) 3 colloids stabilized by FeCl 3 are used as the precursor to fabricate with carbon from glucose and graphene oxide (GO) to prepare superparamagnetic iron oxide/carbon/rGO (reduced graphene oxide) composite for enhanced energy storage performance. Glucose or graphene oxide cannot avoid the aggregation of iron oxides when they are used separately; however, the simultaneous addition of glucose and graphene oxide can supress the aggregation of iron oxide nanoparticles , which is beneficial for energy storage. The characterization results of Fe 2 O 3 -based composites, including XRD , TEM and XPS , reveal that iron oxide nanocrystals in the composites are γ-Fe 2 O 3 . The simultaneous utilization of GO and glucose leads to higher saturation magnetizations of iron oxide than GO or glucose does, and the saturation magnetization of iron oxide in the iron oxide/carbon/rGO composite can be up to 83 emu g −1 . More importantly, the iron oxide/carbon/rGO composites have much higher energy storage performance than that of iron oxide/carbon or iron oxide/rGO samples. The specific capacitance of the composites can reach 400 F g −1 and the retention can remain 92% after 2500 cycles.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yu You,Yangwei Ye,Mengli Wei,WeiJun Sun,Qiong Tang,Jing Zhang,Xing Chen,Heqin Li,Jun Xu
In this work, we report a three-dimensional (3D) MoS 2 /rGO foam based sulfur cathode with improved electrochemical performance for lithium-sulfur batteries. The porous MoS 2 /rGO foam is prepared by a facile hydrothermal method. Few-layered MoS 2 nanosheets with mixed 1T and 2H phases are developed in situ on the basal plane of the reduced graphene oxide (rGO), forming a continuous 3D porous network. It is found that the porous MoS 2 /rGO foam shows synergistic effects of high conductivity, large surface area, strong polysulfide chemisorption and high catalytic activity, consequently resulting in enhanced rate performance and cycling capability of lithium-sulfur batteries. The cells constructed with the MoS 2 /rGO/S cathodes exhibit a high reversible capacity of 1100 mA h g −1 at 0.2 C, an outstanding cycling stability with a low capacity fading rate of 0.15% after 300 cycles at 1 C, and an excellent rate performance up to 620 mA h g −1 at 2 C. Our work reveals that the porous MoS 2 /rGO foam based sulfur cathodes are potential for future high-performance lithium-sulfur batteries.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 6
·4114-4120
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IF 1.354
Huang Zhen,Ge Heyi,Wu Jiaming,Chen Juan
RGO (reduced graphene oxide)-Fe3O4 nanohybrids were successfully synthesized by a solvothermal reduction method. Fe3O4 nanoparticles, RGO and the nanohybrids were characterized using scanning electron microscopy (SEM), transmission electron
microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and vibrating sample magnetometer (VSM). The electromagnetic interference (EMI) shielding effectiveness (SE) of RGO-Fe3O4/SF/PP composite was much higher than that of Fe3O4/SF/PP composite
at 8–12 GHz, which was attributed to synergistic effect between RGO and Fe3O4 nanoparticles. The EMI SE (%) improved with the increase of RGO-Fe3O4 content and the maximum value of 80.44% was obtained for the RGO-Fe3O4/SF/PP
composite. Furthermore, the dominant shielding mechanism of RGO-Fe3O4/SF/PP was absorption.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Shuai Wang,Jiguo Tu,Jiusan Xiao,Jun Zhu,Shuqiang Jiao
The growing global demands of safe, low-cost and high working voltage energy storage devices trigger strong interests in novel battery concepts beyond state-of-art lithium-ion battery. Herein, a dual-ion battery based on nanostructured Ni 3 S 2 /Ni foam@RGO (NSNR) composite anode is developed, utilizing graphite as cathode material and LiPF 6 -VC-based solvent as electrolyte. The battery operates at high working voltage of 4.2–4.5 V, with superior discharge capacity of ∼90 mA h g −1 at 100 mA g −1 , outstanding rate performance, and long-term cycling stability over 500 cycles with discharge capacity retention of ∼85.6%. Moreover, the composite simultaneously acts as the anode material and the current collector, and the corrosion phenomenon can be greatly reduced compared to metallic Al anode. Thus, this work represents a significant step forward for practical safe, low-cost and high working voltage dual-ion batteries, showing attractive potential for future energy storage application .
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
·
IF 2.291
Kui Zhang,Mingquan Ye,Aijun Han,Jiling Yang
In this study, molybdenum disulfide-reduced graphene oxide (MoS 2 -RGO) composites, as ideal electromagnetic (EM) wave absorbing materials, were synthesized by one-step hydrothermal method , and their morphology, components, structure and EM wave absorbing performances were characterized. The results show that the EM wave absorbing performances of MoS 2 -RGO composites were dependent on the graphene oxide (GO) content. When the original amount of GO was 20 mg, the minimum reflection loss (RL) value of MoS 2 -RGO composites was −48.54 dB at 6.70 GHz with a thickness of 3.5 mm, and effective reflection losses were obtained in a wide range of 3.98–15.28 GHz with the thickness of 2.0–5.0 mm. Especially, the 3 mm and 8 mm wave attenuation performances of composites were explored in detail, and the maximum attenuation values were 21.75 and 21.83 dB, respectively. In consequence, MoS 2 -RGO composites are expected to be good electromagnetic wave absorbing materials in broadband.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yaju Zhou,Jinze Li,Chongyang Liu,Pengwei Huo,Huiqin Wang
A multiple transmission channels, heterojunction and 3D PCN/AgBr/rGO photocatalyst was successfully synthetized by introducing the reduced graphene oxide (rGO) covering AgBr onto the surface of 3D porous g-C 3 N 4 (PCN). In PCN/AgBr/rGO, PCN as a semiconductor photocatalyst provides the 3D framework, the heterojunction was formed with AgBr particles and PCN, rGO promotes the electron transfer simultaneously and introduces a multiple transmission channels system to increase the active species. Thanks to the heterojunction formed between PCN and AgBr, resulting rapid separation of photo-generated e − /h + at interface. The 3D PCN/AgBr/rGO nanocomposite exhibits excellent photocatalytic efficiencies for tetracycline (TC) up to 78.4% within 90 min and 2,4-dichlorophenol (2,4-DCP) up to 68.2% within 6 h. The photocatalytic rate of PCN/AgBr/rGO was much higher than 3D PCN (21%), AgBr particles (31%) and most of g-C 3 N 4 -based photocatalysts in TC degradation. Moreover, the PCN/AgBr/rGO shows high photocatalytic stability due to the significantly photocatalytic stability after four photo-degradation cycles. This study highlights the potential application of PCN/AgBr/rGO highly efficient waste water purification.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiaoqing Zhao,Jing Wang,Hou Chen,Hui Xu,Liangjiu Bai,Wenxiang Wang,Huawei Yang,Donglei Wei,Baiqing Yuan
A novel electrochemical immunoassay platform for multi-signal amplification has been constructed and applied to the simultaneous detection of three tumor markers (TMs). The platform was successfully developed by polyethyleneimine (PEI)-polydopamine (PDA)/reduced graphene oxide (rGO) nanocomposites. PDA/rGO as the substrates can simultaneously load with detection antibodies (Ab 2 ) and large amounts of PEI, which PEI were further used to immobilize different signal labels. Three TMs of carcinoembryonic antigen (CEA), prostate specific antigen (PSA) and alpha fetoprotein (AFP) were employed as potential factors. Ferrocenecarboxylic acid (Fc), anthraquinone-2-carboxylic acid (Aq) and acetylsalicylic acid (ASA) were employed as distinguishable signal labels. Electrochemical responses of designed sandwich-type immunosensor were successfully investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The multiplexed immunoassay displayed excellent linear response in the range of 0.102 pg/mL–112 ng/mL for CEA and PSA, 0.117 pg/mL–117 ng/mL for AFP. The detection limit of three TMs were 91 fg/mL, 101 fg/mL and 83 fg/mL for CEA, PSA and AFP, respectively. Moreover, this electrochemical immunoassay platform exhibited excellent reproducibility, sensitivity and selectivity for the simultaneous detection of multiple biomarkers.
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