COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Wei Qi,Mengjie Li,Wei Chen,Jun Yang,Long Zhao
Radiation techniques, with their advantages of being clean, economical, and efficient, have been widely studied for the synthesis of nanocomposites. In this study, reduced graphene loading palladium nanoparticles (Pd/RGO) were prepared in situ in a single step at the phase interface of an ionic liquid (IL)-based microemulsion of these nanoparticles exposed to a high-energy electron beam. The influence of the radiation dose and initial mass ratio of graphene oxide (GO) and PdCl 2 were studied. In addition, the effect of the length of the alkyl chain of the IL on the shape and Pd nanoparticle content of Pd/RGO composites, as well as their electrochemical activity, were investigated in detail. The radiation dose did not affect the shape of the Pd nanoparticles but increased the Pd nanoparticle content of the Pd/RGO composites when the dose exceeded 80 kGy. The Pd nanoparticle content of the Pd/RGO composites decreased as the alkyl chain length of the ILs and the initial mass ratio of GO and PdCl 2 increased. Both the Pd nanoparticle content and their distribution in the Pd/RGO composites have a great influence on their electrochemical performance. Finally, Pd/RGO composites with excellent electrochemical activity were produced efficiently by using the radiation technique. This study provides a basis for the synthesis of carbon-based noble metal nanocomposites using a simple clean and efficient method.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Zhihao Sun,Zhaoqian Yan,Kaicheng Yue,Anran Li,Lei Qian
A composite of nitrogen-doped reduced graphene oxide and carbon nanotubes (N-rGO@CNTs) was prepared. As the mass ratio of CNTs to rGO increasing, the conductive pathways inside the N-rGO@CNTs were gradually formed with strong electronic transmission ability, which contributed to the conversion of electromagnetic energy into thermal energy. Besides, the nest-like “CNTs clusters”, abundant wrinkled layers and through-tubes were favorable for multiple scattering and polarization of electromagnetic waves. More electromagnetic waves were further dissipated in the form of thermal energy. Doping of N atoms introduced a large number of defects and electronic dipoles among the carbon lattice, which could induce the polarization relaxation for higher dielectric loss to attenuate more electromagnetic waves. The experimental results suggested that the multi-scale structure endowed the composite with well-matched impedance, rich loss modes and strong loss, attributed to electronic conduction, defects polarization as well as dipolar polarization, etc. The resulted N-rGO@CNTs 0.3 exhibited the remarkable microwave absorption performance under the ultra-low mass loading of only 2 wt%. Its effective bandwidth was broad and up to 7.1 GHz (10.5–17.6 GHz) with the minimum reflection loss of −49.4 dB.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Jing Wu,Mei Lin,Xiulan Weng,Gary Owens,Zuliang Chen
Emerging contaminants such as Mitoxantrone (MTX) are a major environmental concern because they have potential genotoxicity and mutagenesis to both aquatic organisms and humans. In this study, a pre-adsorption/Fenton-like oxidation system was developed which used a reduced graphene oxide/iron nanoparticles hybrid (rGO/Fe NPs) as both the adsorbent and the Fenton catalyst to remove MTX from solution. While the addition of H 2 O 2 alone removed only 11.3% of MTX, the rGO/Fe NPs/H 2 O 2 system was significantly more efficient removing 99.8% of MTX in the same period. This indicated that rGO/Fe NPs had excellent catalytic activity even at pH 7. This efficient removal was attributed to significant production of ·OH mainly by heterogeneous catalysis but supplemented by a homogeneous Fenton reaction, where ·OH had a higher affinity for MTX than SO 4 − ·. The sequential Fenton-like oxidation process best fits a pseudo-second-order kinetic model (R 2 ≥ 0.974). Characterizations of rGO/Fe NPs before and after the reaction, together with the identification of specific MTX degradation products , allowed possible degradation pathways to be proposed together with insights into the underlying mechanisms of MTX degradation when using rGO/Fe NPs in a pre-adsorption/Fenton-like oxidation system. Finally, the rGO/Fe NPs developed was successfully applied for the removal of MTX from spiked wastewater with 93.6% removal efficiency, which indicated that the proposed system had significant potential for wastewater treatment applications.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Zepeng Rao,Guanhong Lu,Asad Mahmood,Gansheng Shi,Xiaofeng Xie,Jing Sun
The poor efficiency and stability of photocatalysts are the fundamental issues to be addressed for photodegrading VOCs in practical applications. Herein, 0.5 wt%rGO/0.5 mol%Er 3+ -TiO 2 (0.5rGO/0.5 ET) exhibited the excellent performance and a remarkable durability towards gaseous VOC ( o -xylene), while pure TiO 2 (PT) and 0.5 mol%Er 3+ -TiO 2 (0.5 ET) showed poor catalytic activity and deactivation after 60 min. The results suggested that intermediates accumulation was primarily responsible for the deactivation of PT and 0.5 ET. In contrast, the activity of 0.5rGO/0.5 ET was not decreased although more intermediates were generated compared with other samples. The experiments revealed that rGO provide more adsorption sites for the intermediates, which helped 0.5rGO/0.5 ET resist the deactivation even after photodegradation of 10 h and 4 cycles. Therefore, rGO played a vital role in keeping the stable activity of the composites. This study is helpful to understand the deactivation/activation mechanism of photocatalysts and provided a promising strategy to make catalyst in activation for industrial application.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2021
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IF 8.528
Fanghua Luo,Min Zhang,Songlin Chen,Jianfeng Xu,Chen Ma,Guohua Chen
Highly thermally conductive polymer composites are desirable for the thermal management of modern electronic devices. Although the thermal conductivity issue has been improved effectively with many methods, it always fails in maintaining the electrical insulation performance at the same time, which has become another great challenge. Here the sandwich-structured PVA/PVA-rGO/PVA (recorded as PVA/rGO) composite films simultaneously owning high thermal conductivity, excellent electrical insulation and outstanding flexibility were designed and prepared through self-construction strategy. The obtained results show that the prepared composite films achieved a high in-plane thermal conductivity of 4.00 W m −1 K −1 with only 5 wt% rGO loading, which was about 970% higher than that of pure PVA (0.413 W m −1 K −1 ). The high thermal conductivity is attributed to the formation of the homogeneous intermediate layer of PVA-rGO. In addition, the low filler loading makes the composite film remain excellent mechanical flexibility, and the PVA in the upper and lower layers of the composite film keeps good electrical insulation (volume resistivity beyond 10 9 Ω cm). The prepared composite films not only have great potential applications in the field of thermal management and flexible electronic devices but also have the possibility to conduct the mass production of polymer composites.
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高影响因子
Canadian Journal of Chemistry
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2020
·Vol. 99
·期 5
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IF 1.171
Shaoming Yang,Jian Zhang,Chaopeng Bai,Kaiqiang Deng
In this study, by encapsulation of reduced graphene oxide (rGO) into Ni-based metal–organic framework (Ni-MOF) structure, the composite rGO@Ni-MOF was first prepared. Then, gold nanoparticle (AuNP) decorated rGO@Ni-MOF (rGO@Ni-MOF/AuNP) were obtained through the electrodeposition. The morphology and structure of rGO@Ni-MOF/AuNP were characterized by SEM, FTIR, and XRD. The rGO@Ni-MOF/AuNP modified electrode was used for the detection of dopamine. Combining the catalysis from Ni-MOF and AuNP with the conductivity of rGO endowed rGO@Ni-MOF/AuNP with synergetic high catalytic activity to the electrochemical oxidation of dopamine. The developed modified electrode had a good linear relationship with dopamine in the concentration range of 0.5∼120 μM, and the detection limit was 0.33 μM (S/N = 3). Additionally, the potential interferents, electrode stability, reproducibility, and practical applications were also studied and satisfactory results were obtained.
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高影响因子
Polymers
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2020
·Vol. 12
·期 12
·3004
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IF 3.426
Cong Zhang,Zhe Shi,An Li,Yang-Fei Zhang
Thermal interface material (TIM) is crucial for heat transfer from a heat source to a heat sink. A high-performance thermal interface material with solid–solid phase change properties was prepared to improve both thermal conductivity and interfacial wettability by using reduced graphene oxide (rGO)-coated polyurethane (PU) foam as a filler, and segmented polyurethane (SPU) as a matrix. The rGO-coated foam (rGOF) was fabricated by a self-assembling method and the SPU was synthesized by an in situ polymerization method. The pure SPU and rGOF/SPU composite exhibited obvious solid–solid phase change properties with proper phase change temperature, high latent heat, good wettability, and no leakage. It was found that the SPU had better heat transfer performance than the PU without phase change properties in a practical application as a TIM, while the thermal conductivity of the rGOF/SPU composite was 63% higher than that of the pure SPU at an ultra-low rGO content of 0.8 wt.%, showing great potential for thermal management.Keywords:reduced graphene oxide;segmented polyurethane;composites;solid–solid phase change;thermal interface material;thermal conductivity;interfacial wettability
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PubMed
高影响因子
IONICS
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2020
·Vol. 26
·期 8
·3831-3840
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IF 2.394
Pei Mengchun,Wu Yuandong,Qi Zhiqiang,Mei Dajiang
NiO/Fe 3 O 4 /rGO composite materials were successfully obtained via a solvothermal route and characterized by charge/discharge test, TEM, XRD, SEM, EIS, HRTEM, XPS, CV, etc. The results showed that the Fe 3 O 4 nanospheres have an average size around 150 nm, NiO is relatively larger (about 300 nm) and agglomerated by rod-shaped particles. The nanospheres of Fe 3 O 4 and rod-shaped NiO particles were distributed on the surface of reduced grapheme oxide. The BET specific surface and BJH desorption average pore diameter of NiO/Fe 3 O 4 /rGO are 497.26 m 2 g −1 and 1.23 nm, respectively, so it improves the contact area between electrode materials and electrolyte, make ion diffusion path shorter and facilitates ion insertion/desertion. Discharge capacity was 841 mAh g −1 at the first cycle and maintain 647 mAh g −1 after 200 cycles at the current density of 500 mA g −1 , and even at the current density of 1000 mA g −1 , the discharge capacity can keep 582 mAh g −1 after 200 cycles with a well Coulombic efficiency and retention. And electrochemical impedance of NiO/Fe 3 O 4 and NiO/Fe 3 O 4 /rGO is 110 Ω and 75 Ω, respectively, indicating that the material has a good ionic conductivity.
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高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Yuan Wang,Hanzhi Wang,Tian C. Zhang,Shaojun Yuan,Bin Liang
A novel hierarchical porous carbon derived from poly(p-phenylenediamine) incorporated with reduced graphene oxide (rGO) is prepared for CO 2 capture and supercapacitors . In this synthesis, chemically in-situ oxidative polymerization and KOH chemical activation are employed with the controllable introduction of GO (GO/Polyphenylenediamine = 0–2 wt%). The obtained carbon material (APG-1%) with high surface area (860.4 m 2 g −1 ) and rich N content (7.91 wt%) exhibits excellent CO 2 capture ability (4.65 mmol g −1 at 298 K, 5 bar) and good electrochemical performance as a supercapacitor electrode with 158.5 F g −1 in 6 M KOH at a current density of 1 A g −1 . Even at a high current density of 10 A g −1 , a capacity of 115.2 F g −1 is still maintained. The rational addition of rGO provides an effective strategy of simultaneous improvement of CO 2 adsorption and capacitive performance.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Xujie Su,Yujie Han,Zhiguang Liu,Lifang Fan,Yujing Guo
Simple, rapid, sensitive, and specific detection of cancer cells plays a pivotal role in the diagnosis and prognosis of cancer. This paper describes an alternative method for detection of nucleolin, which is a major nucleolar protein, overexpressed in several types of cancer, and is a cancer-specific target. Gold nanoparticles/molybdenum disulfide/reduced graphene oxide (AuNPs/MoS 2 /rGO) was easily synthesized with hydrothermal method and characterized by transmission electron microscopy (TEM), x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS). Combining the properties of large surface area and good electrical conductivity of AuNPs/MoS 2 /rGO with the high affinity and specificity of aptamer, a smart hierarchically self-assembled electrochemical aptasensor was established for the specific and sensitive nucleolin (as a model analyte) detection. Under the optimized conditions, AuNPs/MoS 2 /rGO based aptasensor exhibits a great performance for the detection of nucleolin with a linear response from 0.5 nM to 1.0 μM and a low detection limit of 0.16 nM. In addition, this electrochemical aptasensor has good reproducibility towards nucleolin. Besides, the practicability of the TNA (thiolated nucleolin aptamer)/AuNPs/MoS 2 /rGO was demonstrated by analysis of nucleolin in the blood sample. This work paves a promising way for the facile synthesis and design MoS 2 /rGO nanocomposite-based electrochemical aptasensor for testing tumor markers in clinical diagnostics.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Zhixiong Liu,Shu Tian,Qiang Li,Jiancheng Wang,Jibin Pu,Gang Wang,Wenjie Zhao,Feng Feng,Jun Qin,Lichun Ren
The reduced graphene oxide/silver nanoparticle (AgNPs@rGO) nanocomposite was prepared via a simple, straightforward, and environmentally benign thermal reduction method. Dual-functional ORMOSIL (organically modified silicate) coatings with AgNPs@rGO nanocomposite were developed for corrosion and fouling inhibition of copper metals. Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible–near-infrared absorption spectrum (UV–vis–NIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) spectra indicated that the metallic silver nanoparticles (AgNPs) were successfully formed. Scanning electron microscopy (SEM), scanning probe microscopy (SPM), and transmission electron microscopy (TEM) demonstrated that the spherical AgNPs were uniformly distributed across the GO sheets with an average size of 14.9 ± 6.9 nm. Density functional theory (DFT) was used to explore the corresponding adsorption mechanism. The AgNPs@rGO nanocomposite could be well-dispersed into the ORMOSIL sols because of the strong binding strength between the AgNPs and thiol functionality of the sol precursor. Results from electrochemical tests indicated that the introduction of AgNPs@rGO nanocomposite would effectively improve the corrosion resistance of ORMOSIL coatings in a simulated marine environment. The well-dispersed performance of AgNPs@rGO nanocomposite in the coating was favorable to filling the original defect and enhancing the complication of penetration path. Combining the merits of flexible PDMS and AgNPs@rGO nanocomposite into the sol–gel coating greatly improved the corrosion resistance of the hybrid coating. The antifouling test indicated that the ORMOSIL coating with AgNPs@rGO nanocomposite showed excellent antibacterial and antialgae properties. The ORMOSIL coatings filled with AgNPs@rGO nanocomposite have promising applications in the protection of copper metal from corrosion.
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高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Fei Li,Li Zhuang,Wenwei Zhan,Manxi Zhou,Gang Sui,Aosong Zhou,Gang Bai,Wei Xiao,Xiaoping Yang
ZnO decorated ZnFe 2 O 4 nanoparticles were synthesized and combined with reduced graphene oxide (rGO) to form ZnFe 2 O 4 @ZnO@rGO ternary hierarchical nanocomposites by a controllable method. The microstructure, morphology, and microwave absorption performance of the ZnFe 2 O 4 @ZnO@rGO nanocomposites were investigated in detail. The permittivity and permeability of the composites can be effectively regulated by controlling the content of ZnO and rGO to achieve a good impedance matching. Due to the synergistic effect of dielectric loss and magnetic loss, the ZnFe 2 O 4 @ZnO@rGO nanocomposites exhibited strong wave absorption and wide absorption bandwidth. The optimal reflection loss (RL) of the ZnFe 2 O 4 @ZnO@rGO nanocomposites reached −35.2 dB at 12.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 3.7 dB. The ZnFe 2 O 4 @ZnO@rGO hierarchical architecture produced lots of heterogeneous interfaces which made a significant contribution to the wave absorption performance. The combination of interfacial polarization, dipole polarization, and eddy current loss enhanced the microwave absorption capacity of the ZnFe 2 O 4 @ZnO@rGO system. This work provides a feasible approach for the design and preparation of wave absorption materials with tunable permittivity and permeability.
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高影响因子
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