Journal of Materials Chemistry C
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2020
·Vol. 8
·期 12
·4040-4048
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IF 7.059
Yan Li,Shan Wang,Zhi-chao Xiao,Yi Yang,Bo-wen Deng,Bo Yin,Kai Ke,Ming-bo Yang
Wearable strain sensors are a compelling need for health monitoring while designing facile and flexible strain sensors with both super-high sensitivity and a wide strain range in an environment-friendly and scalable way remains challenging. Besides, the mechanism underlying these sensors is still insufficiently studied. Here, we propose a handy method to fabricate flexible strain sensors based on an electrospun thermoplastic polyurethane (TPU) mat by coupling silver nanowires (AgNWs) and reduced graphene oxide (rGO). The TPU-based strain sensors with AgNWs and rGO alone exhibited high strain sensitivity and a broad working range, respectively, due to the morphological differences between the two types of nanomaterials. In contrast, the rGO/AgNWs/TPU sensor showed a synergistic effect on strain sensitivity and sensing range because of the interaction between the AgNWs and rGO, as well as the coupling effect arising from their assembly. For instance, the sensors with hybrid nanomaterials had ultrahigh sensitivity (gauge factor, GF ≈ 4.4 × 107) and a wider detection range in comparison with the counterpart strain sensors with AgNWs/TPU and rGO/TPU (both GFs in the range of hundreds). Besides, the sensors showed reliable responses to various frequencies and strains, as well as long-term stretching (1000 cycles). These strain sensors were applied to monitor human body motions, such as joint motion and muscle movement, which revealed their potential in healthcare and human-machine interfacing applications.
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Materials Research Express
·
2020
·Vol. 6
·期 12
·125621
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IF 1.929
Haopeng Cai,Bo Cheng,Hongbo Xiao,Qinqin Wei
A novel rGO/p-Fe3O4@PANI three-phase nanomaterial was prepared by coating conductive polyaniline (PANI) on reduced graphene oxide (rGO) and porous Fe3O4 (p-Fe3O4), which can increase the reflection interface of electromagnetic waves and extend the reflection path of electromagnetic waves propagating inside the material, and between them. Three kinds of rGO/p-Fe3O4@PANI samples were prepared. The mass percentage of PANI in the samples was established. The mass ratio of rGO to p-Fe3O4 was changed to ameliorate the impedance matching and attenuation constant. Compared with rGO/p-Fe3O4, rGO/p-Fe3O4@PANI exhibits excellent electromagnetic wave absorption performance. When the mass ratio of rGO to p-Fe3O4 in the 40 wt% three-phase material is 1:5 and the thickness is 2.5 mm, the minimum RL of rGO/p-Fe3O4@PANI is −41.38 dB at 9.75 GHz and the effective absorption bandwidth to electromagnetic wave reaches 3.08 GHz (from 8.40 to 11.48 GHz), indicating that is a potentially attractive candidate for high efficiency electromagnetic wave absorbers. The combination of the conductive polymer, porous magnetic nanoparticles and rGO improves the impedance matching condition to some extent, and effectively increases the attenuation constant of the material.
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WATER AIR AND SOIL POLLUTION
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2020
·Vol. 231
·期 5
·1-10
·
IF 1.9
Wang Ning,Zhang Feiyan,Mei Qiufeng,Wu Ronglan,Wang Wei
The harm of chromium pollution to the environment has caused a widespread concern; hexavalent chromium is a toxic, cancerogenic, and genetically mutagenic contaminant to the human body; by contrast, trivalent chromium is almost non-toxic to the human body; therefore, it is a feasible method to reduce hexavalent chromium to trivalent chromium. Photocatalysis is a new environmentally friendly and harmless technology, which can transform pollutants into non-toxic or less toxic products. In this study, we synthesized TiO 2 /rGO/CuO ternary nanocomposites to treat hexavalent chromium pollution under visible light. Under optimal conditions, the photoreduction efficiency of 100 ppm hexavalent chromium solution could reach 100% in 80 min. The photoreduction rate of hexavalent chromium is 29.4 times than that of pure TiO 2 . The photocatalytic property of CuO in TG2C8 nanocomposites is attributed to accelerate the separation of electrons and holes and the efficient electron transfer through the rGO framework. We believe that TiO 2 /rGO/CuO composites have great potential in wastewater treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 44
·49375
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IF 2.52
Liai Yang,Ting Zhang,Wei Sun
To construct an actuator with biocompatibility and potential use in biomedicine field, a light-driven actuator composed of reduced graphene oxide (rGO)/poly (N-isopropyl acrylamide) (PNIPAM) and poly (ethylene glycol) diacrylate (PEGDA) hydrogel is constructed. First, rGO/PNIPAM hydrogel is prepared by free radical polymerization and l -ascorbic acid reduction, of which the surface temperature increases quickly under near-infrared (NIR) laser indicating the efficient photothermal conversion of rGO. The results of cytotoxicity tests demonstrate that rGO/PNIPAM is biocompatible and has no obvious toxicity to myoblast line C2C12 cells. Second, bilayer hydrogel composed of rGO/PNIPAM and PEGDA is prepared using a similar method layer-by-layer. The bilayer strip bends towards rGO/PNIPAM under NIR laser. The bending is improved after reduction. The laser power density has a strong impact on the bending rate and degree. The reversible bending deformation indicates the structural stability. All the above results approve that the bilayer actuator has great potential to be applied in biomedicine fields such as organ-on-chip, drug-carrier, or surgical aid.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Junru Yao,Jintang Zhou,Lu Lu,Feng Yang,Zhengjun Yao,Bo Ouyang,Erjun Kan,Yuxin Zuo,Renchao Che,Fan Wu
Magnetic metal absorbers exhibit remarkable microwave absorption capacity. However, their practical application is severely limited due to their susceptibility to corrosion, particularly in marine environments. To address this challenge, we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum (La). This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine corrosion. In this study, we employ a La 2 O 3 modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe 2 O 4 on the surface, leveraging the pinning effect of in situ generated La 2 O 3 . This process enhances the interface polarization of the absorbers, thereby improving their electromagnetic performance and marine corrosion resistance . Consequently, the La 2 O 3 modified FeCo@rGO composites exhibit broadband absorption, covering a wide frequency range of 6.11 GHz at 1.55 mm. Notably, the electromagnetic properties of the La 2 O 3 modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCl solution, simulating marine conditions, for at least 15 days. Furthermore, we perform first-principle calculations on FeCo and FeCo O to validate the corrosion resistance of the La 2 O 3 modified FeCo@rGO composites at the atomic level. This comprehensive investigation explores the control of rare earth lanthanum modification on the size of magnetic metal particles, enabling efficient electromagnetic wave absorption and marine corrosion resistance. The results of this study provide a novel and facile strategy for the control of microwave absorbers, offering promising prospects for future research and development in this field.
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Small
·
2023
·
IF 13.3
Zhuanxia Li,Lianghao Yu,Xin Tao,Yun Li,Linlin Zhang,Xuedong He,Yan Chen,Sha Xiong,Wei Hu,Jun Li,Jichang Wang,Huile Jin,Shun Wang
Sodium-ion batteries are a promising substitute for lithium batteries due to the abundant resources and low cost of sodium. Herein, honeycomb-shaped MoSe 2 /reduced graphene oxide (rGO) composite materials are synthesized from graphene oxide (GO) and MoSe 2 through a one-step solvothermal process. Experiments show that the 3D honeycomb structure provides excellent electrolyte penetration while alleviating the volume change during electrochemical cycling. An anode prepared with MoSe 2 /rGO composites exhibits significantly improved sodium-ion storage properties, where a large reversible capacity of 215 mAh g −1 is obtained after 2700 cycles at the current density of 30.0 A g −1 or after 5900 cycles at 8.0 A g −1 . When such an anode is paired with Na 3 V 2 (PO 4 ) 3 to form a full cell, a reversible specific capacity of 107.5 mAh g −1 can be retained after 1000 cycles at the current of 1.0 A g −1 . Transmission electron microscopy, X-ray photoelectron spectroscopy and in situ X-ray diffraction (XRD) characterization reveal the reversible storage reaction of Na ions in the MoSe 2 /rGO composites. The significantly enhanced sodium storage capacity is attributed to the unique honeycomb microstructure and the use of ether-based electrolytes. This study illustrates that combining rGO with ether-based electrolytes has tremendous potential in constructing high-performance sodium-ion batteries.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Muhammad Irfan Ahmad,Shuo Chen,Hongtao Yu,Xie Quan
Hydrogen peroxide (H2O2) photocatalytic production from saturated oxygen and water in solar irradiation is an eco-friendly, sustainable, and safe process. Tin dioxide (SnO2) is a promising photocatalyst with excellent light absorption and a low band-gap energy. Reduced graphene oxide (rGO) can promote charge separation and reduce photogenerated charge recombinations. Here, we represent different concentrations of the rGO dopant in SnO2 that enhance the absorption in the visible range and reduce the energy band gap. rGO–SnO2 successfully promotes water oxidation by 2e reduction of O2, producing hydrogen peroxide. Composite materials enhance the H2O2 yield in the presence of an organic electron donor (OED). The catalyst shows excellent endurance under different acidic conditions. Among all concentrations of rGO (0.5, 1, 2, and 4 wt %), 0.5 wt % rGO–SnO2 shows a more efficient H2O2 production in the presence of oxalic acid, as a stabilizer and an organic electron donor. Finally, we affirm a strategy to enhance photocatalytic hydrogen peroxide production regarding charge separation, light absorption, and surface catalytic reaction in an acidic environment. Our work provides valuable guidance to design efficient photocatalysts for H2O2 generation by an insight mechanism.
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Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 4
·714-721
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IF 0.7
Han Jingliang,Chen Lian,Xu Zhengkai,Zhu Chengfei
Abstract Carbon steel was the most widely used grounding metal material. Polyaniline(PANI)/reduced graphene oxide (rGO) composite coating was prepared on carbon steel to optimize its performance by cyclic voltammetry for the first time in mixed solution of oxalic acid, aniline and rGO in this article. The structure and morphology of polyaniline were characterized by FTIR, XRD, and SEM. The effects of rGO doping on the conductivity and corrosion resistance of polyaniline were studied by polarization curve method and four probe method. The results showed that the PANI/rGO coating was successfully prepared on the surface of carbon steel. The PANI was continuously and densely covered on the surface of rGO as villous to reduce the porosity of the coating and improve the conductivity and corrosion resistance of the coating. The conductivity of the PANI coating increased from 3.33 to 23.05 S/cm after doping 10% rGO. The self-corrosion current density of PANI/rGO composite coated carbon steel in the soil decreased from 1.21 × 10 –3 to 5.19 × 10 –4 A/cm 2 and the corrosion inhibition efficiency was 57.1%.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Hang Zhao,Huifang Gao,Senlin Jin,Yaxuan Yao,Xu Li,Jingji Zhang,Quan Zong,Lingling Ren
Exploring interfacial engineering in metal oxide/reduced graphene oxide composite becomes a hotspot in the field of electromagnetic wave (EMW) absorption. In this work, three-dimensional (3D) porous ZnFe 2 O 4 /reduced graphene oxide (ZFO/rGO) composite aerogel was synthesized in situ by a hydrothermal reduction method combined with freeze-drying technique. The results reveal that dispersed ZFO nanoparticles (NPs) are bonded to defect-rich 3D conductive rGO skeleton in a bridging mode with Fe-O-C, resulting in enhanced conduction loss. Consequently, the defect-rich ZFO/rGO composite aerogel exhibits an outstanding EMW absorbing properties: a minimum reflection loss ( RL min ) value of − 29.12 dB and an effective absorption bandwidth (EAB with RL less than −10 dB) of 3.57 GHz at an ultra-thin matching thickness of 1.51 mm. This work provides a new strategy for constructing defect-rich graphene-based composite aerogel as an efficient EMW absorbing materials.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hanwen Zhang,Liuxue Shen,Xiaodong Geng,Jianxin Zhang,Yue Jiang,Hongting Ma,Quanli Liu,Kai Yang,Junlin Ma,Nan Zhu
Sodium superionic conductor (NASICON) structured polyanionic materials have recently attracted great attention for robust crystal structures. However, inherent properties of NASICON presents poor electrical conductivity and low energy density. Herein, non-stoichiometric synthesized strategy is used for acquiring N 3.5 MTP, effectively suppressing voltage hysteresis. Besides, as-fabricated N 3.5 MTP grains in-situ grow on MXene-rGO aerogels by sol–gel synthesis approach obtaining N 3.5 MTP@MXene-rGO. MXene-rGO aerogel as an excellent conductive matrix can effectively avoid agglomeration of Na 3.5 MnTi(PO 4 ) 3 particles and alleviate volume change of the lattice during sodium ion intercalation/deintercalation. Moreover, cross-linked network of N 3.5 MTP@MXene-rGO provides fast electron transfer and ion transport rates. The above synergistic effect and contribution of pseudocapacitance make it an excellent discharge capacity of 189 mA h g −1 at 50 mA g −1 for N 3.5 MTP@MXene-rGO, long cycles of 5000 cycles, as well as 98 mA g −1 at −30 °C (50 mA g −1 ). Prospectively, this study provides an effective strategy for improving electrochemical performance of NASICON-type cathode for sodium batteries.
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Journal of Energy Storage
·
2023
·
IF 9.4
T. Nandagopal,G. Balaji,S. Vadivel
The efficiency of a supercapacitor depends heavily on the materials used to create its electrodes. Physicochemical properties have piqued interest in using transition metal molybdates as electrode materials in supercapacitors . Monodisperse CoMoO 4 nanorods with a modest dimension (about 40–60 nm in width and 1.5–2 μm in length) were created on reduced graphene oxide (rGO) nanosheets were synthesized via a facile hydrothermal method . Hybrid CoMoO 4 @rGO electrodes have shown exceptional electrochemical properties, especially when compared to pure CoMoO 4 in an alkaline electrolyte . In particular, the maximum specific capacitance of CoMoO 4 @rGO is 1425 Fg −1 at a current density of 1Ag −1 , while the greatest specific capacitance of CoMoO 4 is 751 Fg −1 at the same current density. Both the pure and hybrid electrodes show excellent rate capability and long-term cyclic stability, even at high current densities of 20 Ag −1 . Also, at a current density of 20 Ag −1 , the constructed asymmetric supercapacitor generated a maximum power density of 4.5 kWkg −1 , and at a current density of 1 Ag −1 , it generated a high energy density of 51.2 Whkg −1 . Based on their promising electrochemical performance, the hierarchical CoMoO 4 @rGO nanocomposites were discovered to provide for a promising electrode material in the creation of highly effective supercapacitors for power storage.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qishi Zhong,Zhiyong Zhao,Zhihua Liu,Yujun Qin
The exploration of graphene-based electrochemical sensors has aroused intensive interest in application research. Here, we report the decoration of a reduced graphene oxide hydrogel film with Cu 2 O through a facile electrodeposition method and show that the as-prepared Cu 2 O/graphene hydrogel film can be directly utilized as an electrochemical H 2 O 2 sensor. The morphology and structure of the hydrogel composite are characterized, and the optimal electrodeposition time is determined. The graphene/Cu 2 O hydrogel film acting as a H 2 O 2 sensor exhibits high electrochemical sensing properties in terms of response, detection limit and selectivity. The present study could expand the potential of graphene hydrogel materials in the fields of sensors and biosensors.
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危险品化学品经营许可证（带存储）