BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Bing Sun,Lijian Chen,Yan Xu,Min Liu,Huanshun Yin,Shiyun Ai
A novel ultrasensitive photoelectrochemical immunosensor was fabricated based on 3-mercaptopropionic acid stabilized CdS/reduced graphene oxide (MPA-CdS/RGO) nanocomposites for indole-3-acetic acid (IAA) detection. The MPA-CdS/RGO nanocomposites were synthesized by in situ solvothermal growth of triangulated pyramidal CdS nanoparticles on the RGO sheet. 3-Mercaptopropionic acid (MPA) was employed as the modifier and bridge to immobilize the antibody. The nanocomposites were characterized by X-ray diffraction, transmission electron microscopy , scanning electron microscopy and UV/vis spectra. The results showed that the MPA-CdS/RGO nanocomposites revealed enhanced photocurrent response due to excellent electron transport properties of RGO and the improved assembly of CdS nanoparticles onto RGO sheet with the introduction of MPA. Based on the dependence of the photocurrent decline on the concentration of IAA, the proposed photoelectrochemical immunosensor for IAA depicted a linear range from 0.1 to 1000 ng/mL with a lower detection limit (0.05 ng/mL). The high sensitivity, reproducibility and specificity of the method permitted the method suitable to be used in real samples.
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DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 10
·4675-4684
·
IF 2.289
Zhang Peng,Ru Qiang,Gao Yuqing,Yan Honglin,Hou Xinhua,Chen Fuming,Hu Shejun,Zhao Lingzhi
Novel porous nano-silicon/TiO 2 /rGO@carbon anodes with superior lifespan and desirable cycling stability are prepared by a step-wise synthetic procedure. The hybrid exhibits a high specific capacity of 1073.43 mAh g −1 at a current density of 500 mA g −1 . Additionally, it delivers a reversible capacity of 724.08 mAh g −1 at 1000 mA g −1 even after 1000 long-term cycles. Simultaneously, a large average capacity is reinstated after cycling at high rates, such as 994.76, 743.33, and 599.70 mAh g −1 at 1000, 2000, and 3000 mA g −1 , respectively. The greatly ameliorative electrochemical characteristics could be attributed to the abundant buffering space of hierarchical architecture, good separation of mechanically robust anatase-TiO 2 , sustainable confinement of elastic carbon skeletons, as well as improved electrical conductivity of rGO, which could suppress drastic volume variations and promote multiple Li + /electron transport without distinct pulverization.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·1858-1864
·
IF 3.288
Zongkai Wu,Jiangfeng Pei,Xiuduo Song,Ning Liu,Jianguo Li,Ming Zhang,Jun Zhang,Dongxiang Zhang,Fengqi Zhao
The DSC-TG-MS-FTIR coupling technique and in situ FTIR technique were used to study the catalytic effects of nano-Fe2O3 and rGO–Fe2O3 on the thermal decomposition behaviors of CL-20/HMX cocrystals. The results showed nano-Fe2O3 having a good catalytic effect on the thermal decomposition of the CL-20/HMX cocrystal. Nano-Fe2O3 was found to enhance CO2 production and prevent the production of NH2+, HCN, and CHO or N2H+ during the decomposition of cocrystalline CL-20/HMX. Meanwhile, both the CL-20/HMX thermal decomposition peak temperature and Ea were reduced by including nano-Fe2O3. The inclusion of rGO–Fe2O3 did not enhance the catalytic effect of nano-Fe2O3, but did reduce residue formation during the CL-20/HMX decomposition process. Breaking of N–N bonds and the release of NO2 were concluded to constitute the initial steps of the decomposition of the CL-20/HMX cocrystal. This investigation has contributed to our understanding of the thermal decomposition of the CL-20/HMX cocrystal and provides guidance for the catalytic decomposition of energetic material cocrystals.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 56
·32517-32534
·
IF 3.049
Manoj Pudukudy,Qingming Jia,Yanan Dong,Zhongxiao Yue,Shaoyun Shan
A series of magnetically separable rGO/Fe3O4 nanocomposites with various amounts of graphene oxide were successfully prepared by a simple ultrasonication assisted precipitation combined with a solvothermal method and their catalytic activity was evaluated for the selective liquid phase oxidation of cyclohexene using hydrogen peroxide as a green oxidant. The prepared materials were characterized using XRD, FTIR, FESEM, TEM, HRTEM, BET/BJH, XPS and VSM analysis. The presence of well crystallized Fe3O4 as the active iron species was seen in the crystal studies of the nanocomposites. The electron microscopy analysis indicated the fine surface dispersion of spherical Fe3O4 nanoparticles on the thin surface layers of partially-reduced graphene oxide (rGO) nanosheets. The decoration of Fe3O4 nanospheres on thin rGO layers was clearly observable in all of the nanocomposites. The XPS analysis was performed to evaluate the chemical states of the elements present in the samples. The surface area of the nanocomposites was increased significantly by increasing the amount of GO and the pore structures were effectively tuned by the amount of rGO in the nanocomposites. The magnetic saturation values of the nanocomposites were found to be sufficient for their efficient magnetic separation. The catalytic activity results show that the cyclohexene conversion reached 75.3% with a highest 1,2-cyclohexane diol selectivity of 81% over 5% rGO incorporated nanocomposite using H2O2 as the oxidant and acetonitrile as the solvent at 70 °C for 6 h. The reaction conditions were further optimized by changing the variables and a possible reaction mechanism was proposed. The enhanced catalytic activity of the nanocomposites for cyclohexene oxidation could be attributed to the fast accomplishment of the Fe2+/Fe3+ redox cycle in the composites due the sacrificial role of rGO and its synergistic effect with Fe3O4, originating from the conjugated network of π-electrons in its surface structure. The rapid and easy separation of the magnetic nanocomposites from the reaction mixture using an external magnet makes the present catalysts highly efficient for the reaction. Moreover, the catalyst retained its activity for five repeated runs without any drastic drop in the reactant conversion and product selectivity.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Kun Liu,Chaoyang Shi,Juan Yu,Enze Zhu,Zhimin Li,Chengxu Zhang,Wei Li,Xikun Yang,Yingjie Zhang,Mingli Xu
Transition metal-based compounds, due to their excellent ORR catalytic performance under alkaline condition, have recently emerged as one of the most promising alternatives to noble metal-based ORR catalysts. It is worth noting that manganese oxide can take an unique advantage for decomposition of intermediate adsorption products H 2 O 2 and can effectively reduce O 2 to OH − . However, most research has focused on MnO 2 , while attention has rarely been paid to MnO catalysts. In addition, under high-temperature pyrolysis condition, MnO is the most stable manganese oxide but MnO nanoparticles easily agglomerate. Hence, it is very difficult to obtain well-dispersed and small-sized MnO nanoparticles. Herein, on the basis of pre-synthesizing uniformly distributed manganese complexes on the reduced graphene oxide (rGO), we innovatively prepare highly dispersed and small-sized MnO nanoparticles (~3.94 nm) via high-temperature pyrolysis, which are uniformly anchored on N-doped reduced graphene oxide (NrGO) as an efficient oxygen reduction electrocatalyst . The as-obtained MnO/NrGO (1050 °C) electrocatalyst achieves satisfactory onset potential (0.942 V) and half-wave potential (0.820 V) under alkaline condition. And the limiting current density is 4.17 mA cm −2 , which is very close to that of Pt/C (20 wt%, JM). Meanwhile, MnO/NrGO (1050 °C) catalyst presents superior longstanding durability and methanol resistance than Pt/C (JM). This work indicates that high-temperature pyrolysis can improve the purity of manganese oxide, simultaneously the defects of NrGO can reduce particle size of MnO nanoparticles, which are greatly beneficial to improve ORR performance. This work provides a new idea for research of MnO catalysts for ORR in the future.
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高影响因子
Nano Energy
·
2018
·
IF 13.12
Minghui Cao,Minqiang Wang,Le Li,Hengwei Qiu,Muhammad Amin Padhiar,Zhi Yang
Wearable sensors with high sensitivity, fast response and recovery are highly desirable for many new application fields. Herein, we synthesized the cotton fiber which coated with reduced graphene oxide doped with silver nanowire (rGO-Ag NW@cotton fiber) via a simple and environmentally friendly hydrothermal method . The flexible and wearable rGO-Ag NW@cotton fiber based piezoresistive sensor was fabricated with the orientation of face-to-face, where the cotton fiber coated with reduced graphene oxide (rGO@cotton fiber) was used as the lower part of the sensor. The addition of silver nanowire (Ag NW) provides a faster and more convenient channel for charge transfer, resulting in the greatly improvement of the performance, showing the high sensitivity, accompanied with the fast response and relaxation properties. With the effectively wrapping and protection of reduced graphene oxide (rGO), Ag NW was well protected and avoid being oxidized by the air, which contributes significantly to the excellent stability of the sensor. Under the synergistic effect of Ag NW and rGO, rGO-Ag NW@cotton fiber based piezoresistive sensor can be well used in detecting human activities such as finger pressing, bending, twisting, walking and pulse waves, showing high sensitivity, fast response, fast recovery and high stability. These results indicate that the rGO-Ag NW@cotton fiber based piezoresistive sensor has an enormous potential for application in the flexible and wearable pressure sensors.
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DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 4
·1460-1470
·
IF 8.64
Cheng Yufei,Sun Qian,Li Qiujie,Zhang Wenwan,Liu Enzhou,Fan Jun,Xie Haijiao,Miao Hui,Hu Xiaoyun
Antimony selenide (Sb 2 Se 3 ) is a narrow-band-gap semiconductor that has been increasingly used as an excellent light-harvesting material in photoelectrocatalysis. The unique connections of the one-dimensional (Sb 4 Se 6 ) n ribbon structural units determine the high anisotropy of their carrier transport. In this study, a reduced graphene oxide (rGO)-modified quasi-one-dimensional Sb 2 Se 3 @In 2 S 3 light-trapping heterostructure was successfully constructed by vapor transport deposition followed by an in situ hydrothermal method. The results showed that the thickness of the in situ grown non-layered In 2 S 3 nanosheets was significantly reduced from 30 to 10 nm under the space-confinement effect of rGO, facilitating the construction of light-trapping nanostructures and increasing the electrochemically active surface area of the photoelectrode. The quasi-one-dimensional Sb 2 Se 3 @In 2 S 3 -rGO nanorod photoelectrode achieved a higher photocurrent density (1.169 mA cm −2 ), which was 2 and 16 times higher than that of Sb 2 Se 3 @In 2 S 3 and pristine Sb 2 Se 3 , respectively. The ultrathin In 2 S 3 nanosheets were co-modified with rGO nanosheets to fabricate a brush-like composite photoelectrode that exhibited favourable stability with an average hydrogen production rate of 16.59 µmol cm −2 h −1 under neutral conditions. The experimental results and theoretical calculations both showed that the significant improvement in photoelectrochemical performance can be perfectly explained by the type-II heterojunction mechanism. This study provides a new exploration to design rGO-modified composite photoelectrodes for photoelectrochemical applications.
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DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jinlong Li,Hong Zhou,Shuo Huang,Xin Gao,Qinhan Liu,Shuai Zhang,Hang Su,Haopeng Zhang,Hongyan Yue
Low conductivity and slow reaction kinetics are partly responsible limiting the sensing performance of metal-organic-framework (MOF) derived metal oxides, which can be overcome by rational composition and novel microstructural design. In this study, hollow dandelion-like Ce-Zn MOF/reduced graphene oxide (rGO) nanosheets precursor were synthesized by solvothermal reaction and the precursor was annealed to obtain CeO 2 -ZnO/rGO (CZO/rGO). The effects of polyvinylpyrrolidone (PVP), rGO and annealing temperature on its morphology and sensing properties were investigated. The unique morphology of CeO 2 -ZnO provides abundant active sites and large specific surface areas which can improve the ion diffusion efficiency, and the high conductivity of rGO reduces the interfacial resistance and improves the electron transfer rate. The optimized CZO/rGO/ITO electrode achieves a high sensitivity of 17.67 μA·μM -1 ·cm -2 and a limit of detection of 2.1 nM (S/ N = 3) for dopamine (DA) detection. This study broadens the application of MOF derivatives in DA sensing.
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jun Liu,Jiayin Li,Yao Chen,Xin Tan,Chun Yang
The abnormal contain of uric acid (UA) and tryptophan (Trp) in body could cause the liver and kidney function decline. The simultaneous detection of UA and Trp for early prevention of these liver and kidney diseases is significant. This study had developed the α-Fe 2 O 3 /reduced graphene oxide (rGO) for modification of the glassy carbon electrode (GCE) in (UA) and (Trp) detection. α-Fe 2 O 3 /rGO composite was synthesized through hydrothermal-calcination method. The optimal electrochemical conditions, including the pH values, scan rate, and accumulative parameters, were discussed for demonstrating the feasibility. Moreover, this α-Fe 2 O 3 /rGO/GCE presented wide linear relationships (0.01–900 μM) and low detection limits (UA (3.56 nM) and Trp (16.4 nM)). The DFT theoretical calculation revealed that the enhanced performance is mainly due to the high electrocatalytic property of α-Fe 2 O 3 nanotube, high conductivity of rGO, and interaction effect between target biomolecule and modified electrode surface. Finally, the approving results were also acquired in detection of practical UA and Trp samples by α-Fe 2 O 3 /rGO modified GCE. The results indicate that α-Fe 2 O 3 /rGO could provide a new and highly advantageous approach for detection of UA and Trp.
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Nan Zheng,Jie Liu,Yuhang Wang,Chunmei Li,Qiuyu Zhang
Self-healing coatings healed by the synergistic action of ultraviolet light and moisture are developed. Firstly, a polysiloxane-based healing agent, containing acryloyloxy (CH 2 =C(CH 3 )COO-)and methoxy silane(-SiOCH 3 )groups, is synthesized and encapsulated in chitosan-reduced graphene oxide (CS-RGO) microcapsules with compact CS-RGO shell structures. The CS-RGO microcapsules containing the polysiloxane core are then embedded in epoxy-modified silicone resin to achieve efficient self-healing coatings. Herein, an assembly time of 2.5 h results in a complete stacking of GO sheets on the emulsion droplets. As the CS/GO ratio increase, the reduction degree of GO, the sphericity of the CS-RGO microcapsules, and the average diameter all increase. Moreover, the compact CS-RGO shell formed by the assembly and stacking GO sheets as well as the interactions between CS and GO helps to maintain effectiveness of the core and stability of the microcapsules. The result shows that embedding of the CS-RGO microcapsules in the resin matrix improves the mechanical properties and anti-corrosion properties of the matrix. What’s more, the self-healing coatings with the UV/moisture dual healing mode is beneficial for achieving superior self-healing effects, which is promising for various industries, especially the over-water construction of ships, bridges, pipelines, etc.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Peng Zhang,Ji-Lai Gong,Guang-Ming Zeng,Biao Song,Siyuan Fang,Mi Zhang,Hong-Yu Liu,Shuang-Yan Huan,Ping Peng,Qiu-Ya Niu,Dong-Bo Wang,Jun Ye
In this work, a novel rGO/S-GO laminated membrane was prepared by a pressure-assembly stacked method, followed with a thermal deoxygenation process. The neighboring interlayer spacing ( d ) between the composite layers are tunable due to the incorporation of S-GO. The nano-filtration performances of the rGO/S-GO laminated membranes were evaluated at a low-pressure condition. Molecule dynamics (MD) simulation was used to further investigate the size distribution of spacing between GO, rGO and S-GO sheets. The results of filtration experiments indicated that the obtained rGO/S-GO membrane showed a satisfied rejection performance for the removal of dyes and salts with a pressure of two bar. The rejection rates of MB, CR, RB and MO were 99.5%, 99.9%, 97.3% and 98.6%, while the rejection rates of Na 2 SO 4 , MgSO 4 , MgCl 2 and NaCl were 86.3%, 40.9%, 35.7% and 60.5%, respectively. Compared to the pristine rGO membrane, the water permeation of rGO/S-GO laminated membrane was significantly improved from ∼0.98 to ∼3.78 L/(m 2 ·h·bar) due to the enlarged ‘gateway’ for transport of water molecules. The results of classical MD simulation showed that the neighboring layer spacing of rGO, GO and S-GO was ∼8.4, ∼10.2, and ∼14.3 Å, respectively. Their neighboring layer spacing was dependent on the chemical functional groups on the edges of GO sheets. It was further confirmed that the introduction of chemical groups on the GO caused the expansion of the interlayer ‘gap’ between neighboring sheets, which was responsible for the enhanced permeability. These findings would contribute to the development of GO-based nanofiltration membranes with high permeability and understanding the transport mechanism of water molecule.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1109
·
IF 4.034
Fa-Gui He,Jia-Yi Yin,Gaurav Sharma,Amit Kumar,Florian J. Stadler,Bing Du
A hierarchical composite based on the modified reduced graphene oxide with platinum-nickel decorated polyaniline nano-spheres (rGO/PANI@PtNi) was facilely prepared via microwave-assisted self-reduction for an application in nonenzymatic hydrogen peroxide (H2O2) detection. Compared to the pristine rGO, the composite exhibited a much tougher surface due to the stacking of conductive PANI nano-spheres on rGO sheets, leading to good dispersion of PtNi nanoparticles and a large active area. Furthermore, the multi-valance Ni2+/3+in the PtNi particles effectively promoted the catalytic property of Pt sites and facilitated a superior electrochemical performance of PtNi alloy than that of neat Pt. Owing to the synergistic effect of the improved electrical conductivity and the promoted electrocatalytical property, the modified glassy carbon electrode (GCE) with rGO/PANI@PtNi nanocomposite displayed an outstanding electrochemical sensitivity towards H2O2with a fast response time (<2 s), a wide linear range (0.1–126.4 mM), a low detection limit (0.5 µM), as well as a long-life stability for one week without obvious degradation. This novel strategy opens a novel and promising approach to design high performance sensors for H2O2detection.
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高影响因子
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