ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Shaoming Fang,Xiaodong Dong,Shunli Liu,Donglai Penng,Linghao He,Minghua Wang,Guodong Fu,Xiaozhong Feng,Zhihong Zhang
In this paper, we report a novel label-free electrochemical aptasensor for detecting proteins in whole blood based on a three-component nanocomposite , in which ferriferrous oxide and three-dimensional graphene nanocomposite were modified with the plasma-polymerized 4-vinyl pyridine (Fe 3 O 4 @3D-rGO@PP4VP). In this novel sensing strategy, large amounts of amino groups in PP4VP facilitated the immobilization of aptamer strands via the strong electrostatic interaction between positively charged ammonium groups of the nanocomposites and negatively charged phosphate groups of aptamers. In the presence of thrombin, LYS (LYS), and platelet-derived growth factor-BB (PDGF-BB), the adsorbed aptamer strands on the developed nanocomposite surface caught the targeted proteins at the electrode interface. The aptamer preferred to be a barrier for electrons and inhibited electron transfer, leading to the decreased peak current of cyclic voltammetry measurements and the increased electron transfer resistance of electrochemical impedance spectroscopy . The determination of the thrombin, PDGF-BB, and LYS concentrations with this novel strategy showed low detection limits of 4.5, 29.4, and 14 pg·mL −1 , and the analytical ranges extend from 0.01 to 50, 0.1 to 100, and 0.1 to 200 ng·mL −1 , respectively. The resultant aptasensor exhibited high selectivity, acceptable reproducibility, and stability toward thrombin. The aptasensor could be used to detect thrombin in whole blood samples, thereby suggesting its possible application in clinical settings.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Honglu Wu,Dawei He,Yongsheng Wang
The core shell structure of Cobalt@carbon nano rod/reduced graphene oxide (Co@CNR/rGO) is facilely synthesized with a one-pot hydrothermal process. Nitrogen is also introduced into the carbonaceous materials during the synthesis process. Calcination is added to graphitize the carbonaceous material, and simultaneously crystallize the Co particles. To assemble an electrode, the calcined Co@N-CNR/rGO material is uniformly loaded onto a collector of nickel foam by electrophoretic deposition . The specific capacitance is measured to be as high as 3233.3 F g -1 at a current density of 0.1 A g -1 . Three-dimensional rGO aerogels with desirable rate ability and cyclic stability are self-assembled with a hydrothermal reduction process from graphene oxide . Practically, the calcined Co@N-CNR/rGO and 3D rGO aerogel are utilized as cathode and anode to fabricate an asymmetric supercapacitor device, respectively. The operating voltage window of the device is increased to 1.5 V, and the energy density reached 31.8 Whkg −1 at a power density of 302 W kg -1 , and 11.2 Whkg −1 at 45,000 W kg -1 , respectively. The cyclic galvanostatic charge discharge stability is also measured and showed 99.2% capacity retention after 10,000 cycles at a current density of 5 A g -1 .
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高影响因子
POLYMER
·
2024
·
IF 4.1
Xiang Dong,Zhiyu Sun,De-long Li,Qiancheng Duan,Yan Ma,Song Liu
As epoxy resin (EP) is widely used in the microelectronic field, it is essential to improve its electromagnetic wave (EMW) absorption and flame retardancy simultaneously. In this work, we synthesized a novel nanohybrid, RMN (Fe 3 O 4 /NHS@M(OH)(OCH 3 )@rGO (M = Co, Ni)), with petal-shaped anisotropic interfaces, by using graphene oxide as the core and the 2D nanosheets M(OH)(OCH 3 ) (M = Co, Ni) as the petal, with nickel hydroxystannate and ferrite as further modifications. The RMN combines carbon-based materials, ferrites and conductors, and represents the petal-like structure with rich nondirectional interfaces. The results show that EP composite containing 25 wt% RMN represented excellent EMW absorption, with a minimum reflection loss of −55.79 dB (with 7.4 mm thickness at 3.1 GHz). Moreover, the EP composite with 15 wt% RMN (EP/RMN700-3) had the lowest peak heat release rate of 470.9 kW m −2 , which was 69.7 % lower than pure EP, showing a significantly improving in flame retardant. The thermal conductivity efficiency of EP/RMN700-3 increased to 128.4 % compared with the pure EP, which effectively reduces fire risk caused by heat accumulation. This study provides a valuable solution to overcome the challenges of EMW absorption and flame retardant for EP in the microelectronic materials field.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lingling Hu,Yuhong Liao,Dehua Xia,Fei Peng,Li Tan,Shaoyun Hu,Changshuo Zheng,Xiaolong Lu,Chun He,Dong Shu
A visible-light-driven photocatalytic fuel cell system integrating electro-Fenton process (EF-PFC), comprised of oxygen vacancies-rich rGO/BiO 1−x I photoanode and biomass-derived N-doped carbon (BNC) cathode, was developed to eliminate organic pollutant and generate electricity synchronously. The structure and properties of rGO/BiO 1−x I were characterized by means of XRD, SEM, TEM, solid-state EPR, FTIR, Raman, XPS, UV-vis DRS and PL spectra. The photoelectrochemical activity of rGO/BiO 1−x I was characterized by Mott-Schottky plots, photocurrent responses and EIS. The experimental results indicated that the introduced oxygen vacancies and graphene modification not only promoted the light-harvesting ability but also greatly improved the generation and transfer rate of charge carriers. Most importanly, BNC, acted as cathode, could efficiently reduce oxygen to H 2 O 2 , thus leading to more ·OH production in the presence of Fe 2+ . Simultaneously, the photogenerated electron could efficiently accelerate Fe 2+ /Fe 3+ redox cycling for continuous Fenton reaction and increasing electricity generation in synergistic EF-PFC system. Using formic acid as sacrificial fuel, approximately 68% removal efficiency was reached in rGO/BiO 1−x I-BNC EF-PFC system under visible light irradiation for 240 min while the photocurrent density ( J sc ) and the maximum power density ( P max ) were measured to be 133.18 μA cm −2 and 17.50 μW cm −2 . Furthermore, the radicals trapping experiments, hydrogen peroxide quantitative studies and ESR tests clearly revealed the mechanism of enhanced performance in rGO/BiO 1−x I-BNC EF-PFC system. Therefore, this engineered rGO/BiO 1−x I-BNC EF-PFC system with the cooperation of Fe 2+ /Fe 3+ redox is a promising means to eliminate organic pollutants and generate electricity synchronously.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Tianhao Wang,Xiang Ji,Fuzhong Wu,Wanliang Yang,Xinyi Dai,Xuejiao Xu,Jing Wang,Dan Guo,Meili Chen
Silicon has an ultrahigh theoretical capacity and has been regarded as the best choice for next-generation lithium-ion battery anodes, but it also suffers from dramatic expansion during cycling. Herein, a novel three-dimensional coral-like Si nanostructure coated with C/rGO (CL-Si@C/rGO) was facilely prepared through the high-temperature magnesiothermic reduction of SiO 2 nanotubes , which were then coated with C/rGO. Systematic tests verified the unique coral-like nanostructure, which was formed by the magnesiothermic reduction of several SiO 2 nanotubes at high temperature. The internal voids and outer C/rGO layer of CL-Si@C/rGO could effectively manage the volume expansion phenomenon while enhancing the electrical conductivity of the electrode, respectively. Benefiting from the ability to maintain the electrode integrity and the outer C/rGO layer of this unique nanostructure, the CL-Si@C/rGO composite electrode could maintain a reversible specific discharge capacity of 739.1 mAh g −1 , even at a high current density of 2 A g −1 . Furthermore, this composite electrode exhibited a 0.5% capacity loss from the 3rd to the 100th cycle at a current density of 1 A g −1 . This work provides a simple, economic, and environmentally friendly procedure for the industrial production of high-performance Si-based anodes.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 27
·18219-18226
·
IF 4.449
Weiyin Gao,Chenxin Ran,Minqiang Wang,Le Li,Zhongwang Sun,Xi Yao
Although reduced graphene oxide (rGO)-based photocatalyst composites have been intensively developed during the past few years, the influence of reduction extent of rGO on the photocatalytic performance of the rGO-based composite has virtually not been investigated due to some technical limitations, such as the poor water dispersibility of rGO and low reduction selectivity of the hydrothermal method, which make it difficult to control the reduction extent of rGO in these composites. Herein, we used a facile room-temperature method to synthesize Ag/AgX (X = Cl, Br)/rGO photocatalyst composites as a model to study the effect of reduction extent of rGO on the photocatalytic performance of the photocatalyst. It was found that the photocatalytic activities of both Ag/AgCl/PrGO and Ag/AgBr/PrGO systems had an optimized threshold of the reduction extent of photoreduced GO (PrGO). More importantly, due to the different conductive band values of AgCl and AgBr, the optimized thresholds in the two systems were at different PrGO reduction extents, based on which we proposed that the favorable energy band matching between AgX and PrGO in the two systems played a crucial role in obtaining high photocatalysis performance. Besides, the photocatalytic reaction of the Ag/AgBr based system was confirmed to be a pseudo-second-order kinetics reaction rather than pseudo-first-order kinetics reaction. The new insights presented in this work provided useful information on the design and development of a more sophisticated photocatalyst, and can also be applied to many other applications.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Ma,Wei Zhong,Langlang You,Yi Pei,Chunxin Lu,Zhiyin Xiao,Zhongquan Shen,Xiujuan Jiang,Nianlong Qian,Xiaoming Liu,Shuhua Zhang
In this work, three materials of Cu-Cu 2 O/rGO-NH 2 -4.4/1, -1/1 and -1/10.4, in which the numeric suffices denote the ratio of Cu/Cu 2 O in the materials, were described and characterized using various analytical techniques including FTIR, XRD, SEM, HRTEM, XPS and Raman spectroscopy. To probe the band structures of these materials, UPS, cyclic voltammetry, and UV–vis reflection spectroscopy were also employed. The formation of heterojunctions in the ternary materials tune their band structures by raising the energy level of valence band maximums (VBMs), inducing an internal electric field (IEF) and an electron accumulation layer (EAL) within the materials. Augment of copper content in the materials can enhance the energy level rising. The coordination of N-methylimidazole (NMI) with Cu 2 O of the materials can also contribute to raising the energy level. The changes in these electronic properties bring about a synergistic effect in selective aerobic oxidation of benzylic alcohols via improving O 2 activation and facilitation of electron transfer between the catalyst and the reactants due to the rising of the energy level of VBM and the formation of IEF.
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高影响因子
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