ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Xin-Lei Cheng,Ting-Rui Fu,Dan-Feng Zhang,Jian-Hua Xiong,Wu-Ying Yang,Juan Du
Reduced graphene oxide-gold nanoparticles nanocomposites (rGO-AuNPs) with high surface-enhanced Raman scattering (SERS) activity was created by biomass-assisted green synthesis with Lilium casa blanca petals biomass for the first time, and its application for methylene blue (MB) degradation was explored through in-situ monitoring. Lilium casa blanca petals biomass was used as a reducing agent to reduce GO and chloroauric acid successively when carrying out rGO-AuNPs in-situ synthesis while it also acted as a capping agent. The produced rGO had oxygen-containing functional groups which had an outstanding performance in enhancing the SERS effect. Characterization results confirmed that the AuNPs were grafted onto the rGO sheet, and the mechanism study showed that total flavonoids in Lilium casa blanca petals biomass were the main biological compounds involved in the reduction. rGO-AuNPs had a high Raman enhancement factor (EF) which could reach 3.88 × 10 7 . The synthesized nanocomposite also had a good catalytic activity that could be employed as catalyst in MB degradation, and it could complete degradation within 15min. The reaction rate increased linearly with the amount of rGO-AuNPs, and the degradation could be in-situ monitored both by UV and SERS.
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高影响因子
Biosensors-Basel
·
2023
·Vol. 13
·期 5
·563
·
IF 5.4
Yanqing Wu,Tao Zhang,Lishen Su,Xiaoping Wu
Herein, a simple and portable electrochemical sensor based on a reduced graphene oxide/gold nanoparticle/manganese dioxide (rGO/AuNP/MnO2) nanocomposite-modified screen-printed carbon electrode (SPCE) was constructed by the facile stepwise electrodeposition method and used for electrochemical detection of As(III). The resultant electrode was characterized for its morphological, structural, and electrochemical properties using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). From the morphologic structure, it can be clearly observed that the AuNPs and MnO2alone or their hybrid were densely deposited or entrapped in thin rGO sheets on the porous carbon surface, which may favor the electro-adsorption of As(III) on the modified SPCE. It is interesting that the nanohybrid modification endows the electrode with a significant decrease in charge transfer resistance and an increase in electroactive specific surface area, which dramatically increases the electro-oxidation current of As(III). This improved sensing ability was ascribed to the synergistic effect of gold nanoparticles with excellent electrocatalytic property and reduced graphene oxide with good electrical conductivity, as well as the involvement of manganese dioxide with a strong adsorption property in the electrochemical reduction of As(III). Under optimized conditions, the sensor can detect As(III) via square wave anodic stripping voltammetry (SWASV) with a low limit of detection of 2.4 μg L−1and a linear range of 25–200 μg L−1. The proposed portable sensor shows the advantages of a simple preparation procedure, low cost, good repeatability, and long-term stability. The feasibility of rGO/AuNPs/MnO2/SPCE for detecting As(III) in real water was further verified.Keywords:electrochemical sensor;gold nanoparticles;metal oxides;nanocomposites;reduced graphene oxide;screen printed carbon electrode;arsenic
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Qinqin Zhou,Guanlin Lv,Xinyu Wang,Weili Teng,Peng Hu,Yucheng Du,Hongyi Li,Yuxiang Hu,Wenxin Liu,Jinshu Wang
Improving the specific capacitance and energy density of a fiber-shaped supercapacitor (FSSC) is critical to its applications as an energy storage device for advanced smart wearable electronics. In this paper, a heterogeneous poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/reduced graphene oxide/molybdenum disulfide (PEDOT:PSS/rGO/MoS2) fiber was prepared to achieve a high-performance and durable electrode for the FSSC. As indicated, pseudocapacitive MoS2 was in situ grown on a highly conductive acid-treated PEDOT:PSS/rGO assembly with a hierarchical structure. This structural design emphasizes the wrinkled morphology and high conductivity of the PEDOT:PSS/rGO backbone to maximize the MoS2 deposition and accelerate its electron transfer, which fully utilizes the pseudocapacitance of MoS2 and provides additional capacitance contribution to the obtained device. Attributed to the synergy, the prepared fiber electrode in the FSSC exhibits high volumetric/areal specific capacitance (325.8 F cm–3/405.3 mF cm–2 at 1 A cm–3 or 1.2 mA cm–2) and excellent rate performance (82%, 1–10 A cm–3). The corresponding device shows an ultrahigh volumetric energy density of 6.9 mW h cm–3 at a high power density of 173.6 mW cm–3 and an areal energy density of 8.5 μW h cm–2 at 215.9 μW cm–2, together with excellent cycle stability and mechanical flexibility, outperforming most of the previously reported FSSCs. Accordingly, the proposed strategy provides a great opportunity to develop a high-performance FSSC for further wearable electronics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhengang Wei,Zelin Xie,Yige An,Gang Wu,Duyu Zheng,Juxing zha,Bin Xiao,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yanwei Sui,Xiaolan Xue,Danyang Zhao,Yongzhi Li,Qing Yin
CoSb particles have an extremely high specific capacity as anodes for Li-ion batteries, but the severe expansion during the reaction process makes their cycle stability very poor. In this study, a 3D CoSb/P-CNFs@rGO network structure has been successfully constructed by a simple electrospinning technique and hydrothermal treatment . 1D carbon nanofibers and 2D reduced graphene oxide network are intertwined and coated to create this 3D structure. In this ingenious strategy, CoSb particles are embedded in carbon nanofibers to restrain volume expansion. By encapsulating the nanoparticles in a graphene structural network, it is possible to stabilize the matrix structure and precipitate CoSb particles for secondary capture. In addition, the 3D network structure also builds a fast channel for 3D interaction electron/ion transfer. Benefiting from the above structural advantages, the CoSb/P-CNFs@rGO flexible self-supporting anode exhibits excellent electrochemical performance, including ultra-long cycling performance (870 mA h g −1 after 2000 cycles at a current density of 500 mA g −1 ). More importantly, the 3D structure design method may provide a simple and effective strategy to overcome the volume expansion of anode materials .
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shaosheng Rao,Qinqin Liu,Bing Li,Yangyang Sun,Yinmao Wang,Guozhong Gao,Zhongti Sun,Juan Yang
Silver nanoparticles (Ag NPs) are used as antimicrobial agents due to their high-efficiency, broad-spectrum disinfection activity. However, the agglomeration and stability problems caused by excessive release of silver ions (Ag + ) have severely restricted their developments. Herein, a novel silver/polyethyleneimine/reduced graphene oxide (Ag/PEI/rGO) antibacterial material featuring good dispersibility and permeability was rationally designed, thus benefiting for the capture of bacteria due to the introducing of highly-cationic PEI modifier and controllable release of biocidal agents (Ag + ). Compared with Ag/rGO, the Ag/PEI/rGO has excellent stability and shows a more efficient sterilization efficacy against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) with 100% germicidal efficiency with low orders of dozens of ppm. In addition, the outstanding biocompatibility of this Ag/PEI/rGO antibacterial material endows it with promising potential in sterilization applications, which is expected to solve the infection problem caused by bacterial biofilm formation.
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Nanoscale
·
2023
·Vol. 15
·期 8
·4063-4070
·
IF 6.7
Mengjiao Li,Qingjie Yu,Meie Zheng,Rongrong Jiang,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu
A label-free electrochemical immunosensor for high-sensitive detection of β-amyloid 1–42 (Aβ 1–42) was constructed based on Au-modified B, S, and N co-doped reduced graphene oxide (Au-BSN-rGO). The electronic structure of Au-BSN-rGO was investigated by first-principles calculations, which showed that the band gap of graphene was opened, thus improving its electrical conductivity. Moreover, Au-BSN-rGO was successfully prepared and characterized, and the obtained results discovered that it could be used as a signal amplifier for immunosensors due to the advantages of the good electrochemical characteristics and enormous surface area of BSN-rGO and the accelerated electron transfer ability of Au NPs. Furthermore, the label-free electrochemical immunosensor had a linear detection range of 0.1 pg mL−1–10 ng mL−1 and a detection limit of 0.072 pg mL−1, and it had good specificity, stability, and reproducibility. Also, this immunosensor showed recoveries of 89%–109% with an RSD of 2.61%–4.19% for detecting Aβ 1–42 in actual sample analysis. Therefore, the label-free electrochemical immunosensor based on Au-BSN-rGO should have a promising clinical application prospect for detecting Aβ 1–42.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuhang Zhang,Jin Qian,Peifang Wang,Yuxuan He,Bianhe Lu,Sijing Tang,Kailin Xu
In this study, ternary magnetic nanocomposites (SrTiO 3 /CoFe 2 O 4 /rGO, SCG) doped with cobalt ferrite and loaded with rGO were successfully synthesized, and utilized to rapidly activate PMS to degrade LVF. After evaluating the efficacy of samples with different loading loads, SCG-1 (1 % wt rGO loading) was selected for further testing due to its optimal catalytic activity (degradation efficiency reached 87.4 % in 5 min). Quench experiments and electron paramagnetic resonance (EPR) analysis showed that SO 4 − , 1 O 2 , OH were the main active substance involved in LVF degradation. Based on the redox cycle of Co and Fe ions and the platform provided by perovskite and rGO, the reaction can be carried out quickly. The vulnerable sites and possible degradation pathways of LVF were further analyzed by density functional theory (DFT) calculation and LC-MS/MS analysis, and the developmental toxicity and ecological risk of intermediate products were determined based on toxicity assessment software (T.E.S.T). This study provided a new vision for realizing rapid antibiotic degradation in water environments and provided theoretical support for the subsequent research on novel nanomaterials.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 10
·5279-5287
·
IF 11.9
Yange Yu,Wenzhu Shao,Yue Liu,Yang Li,Jing Zhong,Huijian Ye,Liang Zhen
Superior energy storage performance of PVDF-based nanocomposites such as discharged energy density or efficiency is reported, leading to a lower volume, lightweight system, or high reliability for film capacitors. However, researchers often ignore exploring practical ways to simultaneously enhance the discharged energy density (Ue) and energy storage efficiency (η) as well as the physical mechanism that determines the energy storage performance. Herein, the charge transfer path in the PVDF matrix with core–shell nanoparticles under 150 MV m−1 was first analyzed by finite element simulation. Under the guidance of theoretical simulation, core–shell structured BaTiO3 (BTO)@reduced graphene oxide (rGO) nanoparticles (NPs) were introduced into the PVDF matrix, in which rGO played the trapping role. The introduction of rGO reduces the possibility of local electric field failure of composite materials, optimizing the charge transfer path and improving both Ue and η, which are superior to the data in the literature. An effective strategy for creating high-energy storage polymer nanocomposites is presented in this study.
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POLYMER
·
2023
·
IF 4.6
Long Ni,Yinfu Luo,Guanchun Wang,Liwei Yan,Shaoyu Qiu,Mei Liang,Shengtai Zhou,Huawei Zou
In this work, a facile microwave-assisted foaming and thermal imidization treatment method was proposed to fabricate flexible polyimide (PI)/rGO composite foams with anisotropic pore structures . The PI/rGO composite foams (PIF/rGO) were used as the starting derivatives to prepare carbon foams that demonstrated excellent anisotropic thermal insulation and electromagnetic interference (EMI) shielding applications. The directional growth of pore structures during the foaming period resulted in the formation of aligned ellipsoidal strip-like pore structure in the horizontal direction (i.e., perpendicular to the pore growth direction), which was attributed to the escape of foaming gases such as tetrahydrofuran , methanol and H 2 O. The homogeneous dispersion of rGO in the PI-derived carbon skeleton endowed corresponding carbon foams with excellent mechanical and thermal stability, high thermal insulation and electrical conductivity (σ) as well as absorption dominated EMI shielding performance. The σ and EMI shielding effectiveness (SE) of carbon foams showed an increasing trend with increasing rGO content. The σ, EMI SE and specific EMI SE of the carbon foams reached up to 33.0 S/m, 49.0 dB and 8792.8 dB/(g/cm 2 ) in the horizontal direction, respectively. Therefore, this work provided a facile strategy to fabricate lightweight and anisotropic pore structure rGO-containing PIFs and carbonized derivatives, which demonstrated promising applications in high-end industrial fields.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Huijie Wang,Yang Wan,Binrong Li,Jian Ye,Jiahao Gan,Jiejing Liu,Xin Liu,Xianghai Song,Weiqiang Zhou,Xin Li,Pengwei Huo
The charge carrier separation efficiency and the adsorption capacity of the photocatalyst usually affect the degradation rate of antibiotics. Herein, Cerium-doped leaf-like CdS (Ce-CdS) modified with ultrathin N-doped rGO (N-rGO) composites were successfully constructed (Ce-CdS/N-rGO) to investigate the removal efficiency of tetracycline (TC). X-ray photoelectron spectroscopy (XPS) and photoelectrochemical results revealed that Ce ions doped in CdS acting as the electron capture sites facilitated the interfacial charge transfer. Theoretical calculation (DFT) results indicated that the interfacial effect between Ce-CdS and ultrathin N-rGO promoted the transfer of photogenerated electrons under the synergistic effect between the doping and interface modification strategy. The optimized Ce5-CdS/N-rGO20 composites had the maximum TC removal capability (94.5%) and maintained a stable cycling performance. In addition, the adsorption-driven photocatalytic degradation pathway of TC was studied through mass spectrometry (MS) and in-situ Fourier transform infrared spectroscopy ( in-situ FTIR). This study will provide an effective strategy for the construction of efficient photocatalytic composites for wastewater treatment.
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BIOELECTROCHEMISTRY
·
2023
·
IF 5
Wenjing Qian,Jingming Zhou,Yumei Chen,Hongliang Liu,Peiyang Ding,Yankai Liu,Chao Liang,Xifang Zhu,Ying Zhang,Enping Liu,Aiping Wang,Gaiping Zhang
Virginiamycin (VIR), a feed additive, is used to promote pig and poultry growth. However, it is hazardous to human health. This work described a label-free electrochemical immunosensor based on silver nanoparticles-reduced graphene oxide (AgNPs-rGO) nanocomposites and staphylococcal protein A (SPA) for the first time to directly detect the residual marker VIR M1. Good catalytic currents for oxygen reduction reaction were apparently obtained after the modification of nanocomposites on gold electrode. Nanocomposites were characterized using UV–Vis, X-ray diffraction (XRD) patterns, Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). SPA was targeted to immobilize VIR M1 monoclonal antibody (mAb) by binding to Fc region of antibody. The proposed immunosensor showed a wide linear range from 0.25 ng mL −1 to 100 ng mL −1 , providing detection limit (LOD) of 0.18 ng mL −1 of VIR M1. Recovery rates ranged from 92.27% to 98.84%, and relative standard deviation (RSD) was not above 6.6%, indicating the immunosensor could detect VIR M1 in actual samples with high accuracy. The sensor showed good selectivity, reproducibility and stability and could be considered as a potential tool for detection of VIR M1 in feed and animal derived food.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yunyun Ding,Panpan Li,Jiashuang Wang,Xian Li,Yun Liu,Hongcun Bai,Hui Zhang
Si has become the most promising anode materials for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and comparable low discharge potential. However, the practical usage of Si is still hindered by its huge volume expansion. To release volume stress and improve conductance, designed self-supporting binder-free Si electrode endowed with three-dimensional structure has been come up in this research. The pore structure is adjusted by rationally designing the proportion of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) to alleviate volume change. Simultaneously, construct stable conductivity network was fabricated via ice crystal self-assemble freezing technique following compress and carbonization process. The electrochemical specific capacity of rGO@CNTs@CNFs@Si-2 electrode has stably remained at 2250 mAh/g after 100 cycles (100 mA/g) with benign rate capabilities. This simple self-assemble method for self-supporting binder-free Si electrode would open a new route to exploit high energy density Si-based electrode for flexible LIBs.
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