Journal of Materials Chemistry A
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2021
·Vol. 9
·期 47
·26999-27009
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IF 12.732
Kexia Jin,Jianxiong Xing,Xinge Liu,Zehui Jiang,Shumin Yang,Xuan Yang,Jianfeng Ma
To achieve high mechanical strength electromagnetic interference (EMI) shielding materials for practical application, cellulose nanocrystals (CNC), as a reinforcing and dispersing agent, are intercalated into reduced graphene oxide (RGO) layers, forming an ultrathin, robust, flexible, and hydrophobic CNC/RGO film with a highly ordered nacre-like layered structure via a self-assembly process. The layered structure significantly shortens the reduction time and improves the mechanical strength and shielding effectiveness (SE) of the resultant CNC/RGO composite film. The controlled preparation of CNC with different aspect ratios is realized by using separated bamboo fiber and parenchyma. The CNC of the fiber with a higher aspect ratio and lower diameter results in a lower porosity, denser structure, and more uniform distribution in the composites, and therefore a higher electrical conductivity and SE. The highest SE (39.1 dB) and specific SE (11 367 dB cm2 g−1) with a high tensile strength (179 MPa) and water contact angle (106°) of the CNC/RGO film are obtained at 10 wt% CNC loading with a film thickness of 12 μm. The maximum tensile strength of the composite film reaches 227 MPa with 30–50% CNC. The ultrathin high-performance CNC/RGO film shows significant potential as an EMI shielding material in the aerospace and flexible electronics fields.
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Sustainable Materials and Technologies
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2021
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IF 7.053
Zhifan Zhao,Xiaojing Teng,Qinqin Xiong,Hongzhong Chi,Yongjun Yuan,Haiying Qin,Zhenguo Ji
FeSe 2 @reduced graphene oxide (rGO) composite was prepared by a facile one-step hydrothermal technique with FeSe 2 nanoparticles uniformly achored on rGO nanosheets . The nano-sized FeSe 2 particles effectively reduce the transfer length of Li ion and increase the sufficient contact area between the electrolyte and active material. Moreover, rGO can not only improve the electrical conductivity , but also prevent the agglomeration of nano-sized FeSe 2 , as well as accommodate the volume expansion and strain generated from the charge/discharge process. As an anode material applied in Li-ion storage, FeSe 2 /rGO composite delivers superior specific capacity of 1167.6 mAh/g, good cycling stability (908.2 mAh g −1 after 120 cycles at the current density of 500 mA g −1 ) and high-power characteristics (728.0 mAh g −1 at 1000 mA g −1 ), due to coexistent Li-ion storage mechanisms of surface capacitive behavior and diffusion-controlled process.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Ying Chen,Hongmei Liu,Xiuting Li,Shiwei Tang,Chenjie Gu,Guodong Wei,Tao Jiang,Xingfei Zhou
Molybdenum disulfide (MoS 2 ) with promising photocatalytic activity has attracted great attention in constructing recyclable SERS substrate. Reduced graphene oxide (RGO) was chose here to in-situ grow MoS 2 nanoflowers and effectively adjust the active area of the substrate. After the decoration of Ag nanoparticles by photo-reduction, a sophisticated RGO@MoS 2 @Ag ternary nanocomposite with a maximizing SERS enhancement factor (EF) of 8.6 × 10 6 and a prominent solar photocatalytic efficiency was demonstrated. Such superior features of the nanocomposite were revealed to be endowed by the synergistic effect of the three components including the active sites of MoS 2 , the “Schottky barrier” and “hot spots” between MoS 2 and Ag, together with the molecular enrichment surface and chemical enhancement ability of RGO . An ultra-sensitive SERS-based detection and a reliable photocatalytic degradation of mixed trace molecules were finally achieved by the developed optimal ternary nanocomposite, which can meet manifold requirements for the routine supervision of biochemical molecules.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Lizhu Chen,Xueting Xie,Xianliang Song,Shucan Luo,Shengying Ye,Wenbei Situ
To maintain the quality of harvested fruits and vegetables in a closed refrigerated environment, a novel nanocomposite photocatalyst MIL101(Fe)-TiO 2 -rGO (MTR) for ethylene degradation was synthesized. The characterization of MTR was analyzed by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and High-resolution transmission electron microscope (HRTEM). Moreover, with the good conductivity of rGO, MTR had the smallest band gaps according to ultraviolet–visible solid diffuse reflection (UV–Vis DRS) analysis; this small band gap size improved the utilization of light. According to the results of the photoluminescence spectra and electrochemical impedance spectra, the charge transfer resistance and transient photocurrent of MTR were improved. The redox process of Ti 4+ /Ti 3+ from TiO 2 and Fe 3+ /Fe 2+ from MIL101(Fe) efficiently prevented the recombination of e - -h + pairs. In this cycle, oxidative active substances ( • O 2 − ) were provided, which played a key role in the ethylene degradation of MTR. Additionally, MTR has excellent gas adsorption capacity, and the photocatalytic degradation rate of C 2 H 4 by MTR was 2.07 × 10 -4 min −1 , which is better than that of other photocatalysts. Furthermore, the photocatalytic activity of MTR was still stable after 4 times of recycling, indicating the potential to maintain the quality of horticultural products after harvesting.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Wenyan Yin,Khaled Tawfik Alali,Milin Zhang,Jingyuan Liu,Dalei Song,Qi Liu,Jing Yu,Rongrong Chen,Hongsen Zhang,Jun Wang
Ionic liquids are widely employed as electrolytes for electrochemical oxygen sensing due to their excellent physical and chemical properties. Recently, combining inorganic electrochemically active materials with ionic liquids are becomes intensively interesting to improve oxygen sensor performance. In this paper, two imidazolyl-based ionic liquids 1-ethyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Emmim][TFSI] and 1-butyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Bmmim][TFSI] with three saturated alkyl substituents on the aromatic ring were prepared by a traditional two-step method. Under the electrochemical test, both ionic liquids exhibit a certain responsibility to different concentrations of oxygen. Subsequently, α-Fe 2 O 3 /rGO was prepared by hydrothermal method and then mixed with the ionic liquids to prepare a composite ionic liquid electrolyte for detecting a wide range of oxygen concentrations. The response performance of prepared composite electrolyte toward the oxygen is improved, which exhibits a sensitivity of 0.1041 μA/[%O 2 ] to gradually changed oxygen concentration and a linear correlation (R 2 ) of 0.9997 between oxygen reduction peak currents. Hence, the results show that the pure ionic liquid has a certain ability to detect oxygen, while adding α-Fe 2 O 3 /rGO compounds further improve responsibility, stability and sensitivity of composite electrolyte to oxygen.
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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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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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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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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
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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COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
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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Canadian Journal of Chemistry
·
2020
·Vol. 99
·期 5
·
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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Polymers
·
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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