Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 42
·14641-14651
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IF 6.4
Ziwen Wang,Zhen Qin,Biao Zhao,Han Zhu,Kai Pan
With the rapid development of artificial intelligence, the study of flexible pressure sensors has attracted great attention from researchers. However, in the face of extreme application environments such as aerospace and national defense, higher requirements are put forward for flexible pressure-sensing active materials. In this study, a novel electrospun polysulfonamide and polyacrylonitrile (PSAN) nanofiber-reinforced three-dimensional (3D) reduced graphene oxide aerogel (GA) is designed and fabricated. The pore wall of the aerogel has a leaf-like structure, the internal micropore has a “layer-pillar” structure, and the compression strength is as high as 26.07 kPa. The assembled piezoresistive sensor has a wide detection range (24.97 kPa), high sensitivity (32.85 kPa−1), and an extensive operating temperature range (−60 to 200 °C). It features a rapid response time of 300 ms at low pressure, excellent structural stability, and a sensing durability of over 3500 compression cycles. Moreover, the piezoresistive sensor can track the physiological and activity signals of the throat, face, fingers, elbows, knee joints, and other parts of the human body in real time, and has a stable sensing performance at ultra-low and high temperatures. These excellent sensing properties indicate that the GA aerogel has great application potential as a high-performance flexible piezoresistive active material in extreme environments.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Longjie Liu,Zeyang Lu,Wanling Cai,Gary Owens,Zuliang Chen
Reduced graphene oxide/iron nanoparticles (rGO/FeNPs) synthesized by the chemical method have been used in Fenton oxidation of organic contaminants , yet little is known about biosynthesized rGO/FeNPs using green tea extract (GT) as how to activate persulfate in sulfate radical-based advanced oxidation processes . In this study, rGO/FeNPs were used to activate peroxydisulfate (PDS) for 17β-estradiol (βE 2 ) and estriol (E 3 ) removal. The rGO/FeNPs-PDS system removed 83.6% of βE 2 and 62.5% of E 3 within 240 min, which was confirmed by a combination of adsorption and degradation via both radical and non-radical pathways. Four main reactive species in βE 2 and E 3 degradation were observed, i.e., hydroxyl radical (·OH), sulfate radical (SO 4 ·− ), singlet oxygen ( 1 O 2 ) and electron transfer , with the respective contributions of ·OH (32.9 and 34.7%), SO 4 ·− (16.1 and 19.7%), 1 O 2 (12.2 and 14.1%) and electron transfer (8.0 and 7.2%). Analysis of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Electron Paramagnetic Resonance (EPR) and electrochemical measurements all indicated that beside the well-known role of Fe, C O from rGO through the generation of ·OH, SO 4 ·− , 1 O 2 and electron transfer, as well as GT through electron transfer also participated in the activation of PDS. Finally, the degradation pathways of βE 2 /E 3 were proposed. Overall, this study provides a new insight into the biosynthesis of rGO/FeNPs to activate PDS for the oxidation of mixed emerging contaminants .
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Nanomaterials
·
2023
·Vol. 13
·期 16
·2370
·
IF 5.3
Ke Huang,Junfeng Lu,Donglin Li,Xianjia Chen,Dingfeng Jin,Hongxiao Jin
To improve the gas sensitivity of reduced oxide graphene (rGO)-based NO2room-temperature sensors, different contents (0–3 wt%) of rGO, ZnO rods, and noble metal nanoparticles (Au or Ag NPs) were synthesized to construct ternary hybrids that combine the advantages of each component. The prepared ZnO rods had a diameter of around 200 nm and a length of about 2 μm. Au or Ag NPs with diameters of 20–30 nm were loaded on the ZnO-rod/rGO hybrid. It was found that rGO simply connects the monodispersed ZnO rods and does not change the morphology of ZnO rods. In addition, the rod-like ZnO prevents rGO stacking and makes nanocomposite-based ZnO/rGO achieve a porous structure, which facilitates the diffusion of gas molecules. The sensors’ gas-sensing properties for NO2were evaluated. The results reveal that Ag@ZnO rods-2% rGO and Au@ZnO rods-2% rGO perform better in low concentrations of NO2gas, with greater response and shorter recovery time at the ambient temperature. The response and recovery times with 15 ppm NO2were 132 s, 139 s and 108 s, 120 s, and the sensitivity values were 2.26 and 2.87, respectively. The synergistic impact of ZnO and Au (Ag) doping was proposed to explain the improved gas sensing. The p-n junction formed on the ZnO and rGO interface and the catalytic effects of Au (Ag) NPs are the main reasons for the enhanced sensitivity of Au (Ag)@ZnO rods-2% rGO.Keywords:Au nanoparticles;Ag nanoparticles;rGO;ZnO rods;p-n junction;synergistic effect
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Surfaces and Interfaces
·
2023
·
IF 6.2
Lu Dou,Man Yuan,Daiqi Li,Sizhuo Zou,Sirui Tan,Zhong Zhao,Guangming Cai
Wearable sensors, which feature textile substrates integrated with conductive layers, have received increasing attention from researchers due to their huge potential in health management. However, the inevitable damage of conductive layer caused by friction and bacterial growth on the textile substrate during its direct contact with bare skin are still the issues that hinder the long-term service of wearable sensors. Herein, a core-sheath yarn was prepared by wrapping polyester (PET) fibers coated with reduced graphene oxide (rGO)/silver nanoparticles (Ag NPs) around the spandex filaments via friction spinning. The core-sheath structure guarantees good prevention of the interface composed of rGO and Ag NPs in between from friction, while the introduction of Ag NPs ensures antibacterial activity of the yarn. The morphology and chemical composition of the nanomaterials deposited on the surface of PET fibers was investigated to reveal the sensing mechanism of the yarn. Meanwhile, its sensing performance was comprehensively evaluated from the perspectives of sensitivity, durability and comparison of commercial ECG. Despite the fact that inevitable damage of the rGO/Ag layer occurred during the friction spinning process, the core-sheath yarn still featured a gauge factor of 8.11 and a threshold of sensing range up to 68.57 %. Apart from being able to detect respiratory signals, cardio signals with the frequency of 70 beat per min (bpm) was also recorded. Compared to signals with the frequency of 73 bpm recorded by a commercial ECG sensor simultaneously, the core-sheath yarn exhibited satisfying precision. Moreover, the existence of Ag NPs in the conductive interface endowed the yarn with ability to yield 13-mm and 15-mm wide growth inhibition zones of E. coli and S. aureus , respectively. The cardiorespiratory sensing ability coupled with antibacterial activity of the yarn suggested its satisfying sensitivity and prolonged service time, making it a promising wearable sensor subjected to direct skin contact for long-time cardiorespiratory monitoring.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ying-Ming Li,Yi-Ran Li,Wen-Juan Hu,De-Yi Wang
To meet the increasingly serious challenges of electromagnetic pollution and fire hazards, highly efficient electromagnetic absorbing materials with good flame retardancy have been accurately developed. A complex high-performance electromagnetic absorber was designed by doping graphene oxide heterostructures (including zero-dimensional nanoparticles and two-dimensional graphene) containing cobalt, nickel and iron oxyhydroxide through the coordination effect. When 20 wt% CNFO@rGO was incorporated into paraffin, the minimum reflection loss (RL) reached -51.6 dB at a thickness of 3.5 mm, showing a high electromagnetic absorption efficiency. It was concluded that the excellent impedance matching, the best dielectric loss and the higher magnetic loss caused by the heterostructure combined with the electromagnetic parameters, Cole-Cole semicircle, impedance matching (Z) and attenuation coefficient resulted in excellent electromagnetic wave absorption performance. Moreover, the peak heat release (PHRR) and heat release rate (HRC) decreased by 55.5% and 55.1%, respectively, when 10 wt% CNFO@rGO was incorporated into the epoxy resin (EP), indicating enormous potential for the enhancement of flame-retarding electromagnetic absorbing materials.
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Analytical Methods
·
2023
·Vol. 15
·期 29
·3522-3531
·
IF 3.1
Keqin Mi,Liping Tong,Min Yu,Yue Zhao,Hao Dong,Shifeng Hou
Sulfur dioxide (SO2) is a common atmospheric pollutant. Currently, most of the detection methods are based on chemical reactions and optical absorption principles. However, these methods have some limitations in their detection range and accuracy, especially in complex environments. In this work, sulfur dioxide was absorbed by an ionic liquid, and a new electrochemical sensor based on 3D-rGO/CB was developed for electrochemical detection. Specifically, carbon black (CB) nanoparticles were incorporated with graphene oxide (GO) sheets using spray drying technology to form a highly porous and interconnected 3D-GO/CB microsphere structure. Then, the 3D-rGO/CB/GCE electrochemical sensor was fabricated by electrochemical reduction of the composite material onto a glassy carbon electrode (GCE) surface and used to detect sulfur dioxide in ionic liquids. The results demonstrated that the sensor had excellent conductivity and mass transfer preferable performance catalytic activity for SO2 in ionic liquids, and a linear detection range of 100–3500 ppm. Besides, the detection limit was 52.3 ppm (S/N = 3). Moreover, it had high selectivity, stability, and repeatability. This work significantly contributed to the development of advanced electrochemical sensors with improved performance for detecting SO2 in ionic liquids and has a potential application prospect in the field of electrochemical gas detection.
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JOURNAL OF DAIRY SCIENCE
·
2023
·
IF 3.5
Honglin Li,Congcong Du,Ting Guo,Hongyuan Zhou,Ying Zhou,Xinrui Huang,Yu Hao Zhang,Shuo Wang,Xiaozhu Liu,Liang Ma
ABSTRACT A novel ratiometric electrochemical aptasensor based on split aptamer and Au-rGO nanomaterials was proposed to detect Aflatoxin M1 (AFM1). In this work, Au-rGO nanomaterials were coated on the electrode through the electrodeposition method to increase the aptamer enrichment. We split the aptamer of AFM1 into 2 sequences (S1 and S2), where sequence S1 was immobilized on the electrode due to the Au-S bond, whereas sequence S2 was tagged with methylene blue (MB) and acted as a response signal. A complementary strand to S1 (CS1) labeled with ferrocene (Fc) was introduced as another reporter. In the presence of AFM1, CS1 was released from the electrode surface due to the formation of the S1-AFM1-S2 complex, leading to a decrease in Fc and an increase in MB signal. The developed ratiometric aptasensor exhibited a linear range of 0.03 μg L −1 to 2.00 μg L −1 , with a detection limit of 0.015 μg L −1 for AFM1 detection. The ratiometric aptasensor also showed a linear relationship from 0.2 μg L −1 to 1.00 μg L −1 , with a detection limit of 0.05 μg L −1 in natural milk after sample pretreatment, indicating the successful application of the developed ratiometric aptasensor. Our proposed strategy provides a new way to construct aptasensors with high sensitivity and selectivity.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1372-1380
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IF 3.3
Peng Sun,Menglu Zhang,Yue Liu,Jiahua Zhao,Jiawei Yang,Yufeng Wang,Yongfei Wang,Zhiqiang Zhang
Lithium-ion batteries have been regarded as a promising power source for various electronic devices. Compared to the traditional graphite anode material, MoSe2 possesses a higher theoretical capacity. However, MoSe2 anode materials are limited by low electronic conductivity and large volume changes during cycling. This study reports 1T–2H MoSe2/N-doped rGO nanocomposites, fabricated through a hydrothermal method. The 1T–2H MoSe2/N-doped rGO electrode delivers a high reversible capacity of 483.6 mA h g−1 after 1000 cycles at 1000 mA g−1. It also possesses a high reversible capacity of 474.9 mA h g−1 even at a current density of 2000 mA g−1, thus, making it an important potential lithium-ion battery anode.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qiuhua Yuan,Yuan Yang,Wenshan Wu,Xiaoyi Dai,Junxi Zhong,Youliang Jian,Ruilong Li,Tao Wang,Hong Yu,Xianyou Xia
Titanium dioxide (TiO 2 ) is widely used as photocatalysts in the field of organic wastewater treatment in recent years.In this study, TiO 2 is combined with hydroxyapatite (HA) and reduced graphene oxide (RGO) to prepare a novel ternary composite material. And methylene blue(MB) was used as the target pollutant to evaluate the photocatalytic activity of TiO 2 /HA/RGO. The results show that the introduction of HA and RGO can effectively enhance the catalytic performance of TiO 2 . Under 120min of simulated sunlight, the composite showed excellent dye removal effect, the removal rate of MB can reach 99.8%, and its degradation rate is 2 times that of TiO 2 /HA and 7 times that of TiO 2 . The improvement of the photocatalytic activity of the ternary composite is mainly due to the synergistic effect between TiO 2 , HA and RGO. This work provides a new idea for the synthesis of practical photocatalysts.
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Journal of Energy Storage
·
2023
·
IF 9.4
Juan Wang,Peimin Zhan,Dong Zhang,Luping Tang
A solid supercapacitor based on inorganic/organic composite electrolyte has great promise as a fresh wave of energy storage structure in building engineering owning to its inherent mechanical robustness. Unfortunately, the limited capacity and energy density of these supercapacitors are still challenging. Here, rGO/Ni x Co y S electrodes were fabricated by in-situ growth on nickel foam (NF). The edge sulfur-enriched Ni x Co y S nanosheets were equally anchored on rGO surface, increasing the number of electrochemical active sites, accelerating ion diffusion and improving the electrical conductivity . The morphology and electrochemical behavior of the rGO/Ni x Co y S composite are remarkably affected by the Ni to Co molar ratio . It turned out that the rGO/Ni x Co y S composite with a Ni to Co molar ratio of 1:1 (rGO/Ni 1 Co 1 S) exhibited a high capacitance of 4.55 F cm −2 at 1 mA cm −2 . Subsequently, a novel quasi-solid supercapacitor was assembled using rGO/Ni 1 Co 1 S cathode, rGO/Fe 2 O 3 anode as well as inorganic/organic composite solid electrolyte. The device achieved a high energy density of 3.6 μWh cm −2 at a power density of 163.2 μW cm −2 , and moderate self-discharge (SDC) process, outperforming those of earlier reported structural devices. The practical application demonstration proves the feasibility of ternary rGO/Ni 1 Co 1 S electrode combined with inorganic/organic composite solid electrolyte in building energy storage field.
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RSC Advances
·
2023
·Vol. 13
·期 25
·17428-17435
·
IF 3.9
Xiaoyu Wang,Wen Wang,Jixin Yao,Qingxiao Zhang,Xin Gao,Changcheng Lin,Qun Yang,Xueqin Zuo,Shaowei Jin,Guang Li
Dye-sensitized solar cells (DSSCs) can directly convert solar energy into electricity, and have aroused great research interest from researchers. Here, the spherical Fe7S8@rGO nanocomposites were expediently fabricated by facile methods, and applied in DSSCs as counter electrodes (CEs). The morphological features show the porous structure of Fe7S8@rGO, and it is beneficial to enhance the permeability of ions. Reduced graphene oxide (rGO) has a large specific surface area and good electrical conductivity, shortening the electron transfer path. The presence of rGO promotes the catalytic reduction of I3− ions to I− ions and reduces the charge transfer resistance (Rct). The experimental findings show that the power conversion efficiency (PCE) of Fe7S8@rGO as CEs for DSSCs can reach 8.40% (20 wt% for rGO), significantly higher than Fe7S8 (7.60%) and Pt (7.69%). Therefore, Fe7S8@rGO nanocomposite is expected to be an efficient and cost-effective CE material for DSSCs.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xueyu Wei,Saraschandra Naraginti,Xiaofan Yang,Xiaoping Xu,Jiyuan Li,Junwei Sun,Zhigang Liu,Jiang Pei
A superior semiconductor material with efficient charge separation and easy reuse could be a promising route for efficient photocatalytic hydrogen evolution and pollutant degradation . AgVO 3 is one of the best visible light active materials which has attracted much attention for several biological and environmental applications. In the aim of enhancing its stability and recyclability a novel AgVO 3 /rGO/CuFe 2 O 4 heterojunction was prepared by hydrothermal method for hydrogen generation (H 2 ) and 4-nitrophenol (4-NP) degradation as well. The composite was well characterized by XRD, SEM, HR-TEM, XPS and VSM. The morphological images suggested the rod shaped AgVO 3 and irregular shaped CuFe 2 O 4 are unevenly distributed on reduced graphene oxide (rGO) layers. The hydrogen evolution results indicated that the composite showed around 8.937 mmol g −1 h −1 of H 2 generation which was ∼2.3 times and ∼9.2 times higher than pure AgVO 3 (3.895 mmol g −1 h −1 ) and CuFe 2 O 4 (0.96 mmol g −1 h −1 ) respectively. The 4-NP degradation efficiency of the prepared composite was observed as 94.7% (k = 0.01841 min −1 ) which is much higher than the AgVO 3 (66.3%) and CuFe 2 O 4 (38.2%) after 4 h of irradiation. The higher efficiency could be attributed to the heterojunction formation and faster charge separation. The radical trapping results indicated that the •OH, O 2 •− and photogenerated h + are the main species responsible for efficient activity. The AgVO 3 /rGO/CuFe 2 O 4 heterojunction showed 49.6 emu/g of saturation magnetization and confirms that it could be easily separated with an external magnet, and showed 85.3% of degradation efficiency even after 6 recycles which indicated its higher stability and recyclability. Thus, our study provides new insight into hydrogen generation and phenol degradation using AgVO 3 based recyclable composites.
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