APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yangqin Liu,Lei Chen,Lin Liu,Pengfei Shi,Junhui Sun,Yang Wang,Linmao Qian
Reducing wear and even achieving superlubrication in industrial applications using simple yet effective methodologies has been a longstanding research objective. In this study, we propose a convenient approach by employing a combination of carboxylated graphene (Gr-COOH) coating with glycerol as lubricants. Compared to the non-lubricated state, this strategy enabled the achievement of superlubrication with an exceptionally low friction coefficient of 0.002, while simultaneously reducing wear volume of substrate by 4 orders of magnitude, and the wear of the counterpart balls are nearly zero. The transfer of Gr-COOH to the ball surface led to the formation of a low shear resistance interface with the Gr-COOH present on the substrate. Nanoscopic experiments with atomic force microscopy revealed that the substrate surface lubricated by this method exhibited more hydrophilic properties. The formation of a featured hydrophilic interface enables the persistence of glycerol molecules in the contact region for an extended duration, thereby facilitating continuous elastohydrodynamic lubrication. This proposed lubrication methodology holds broad utilization potential as a wear-reduction strategy across various industrial fields.
研究领域:
材料科学
·
摩擦学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Suozhu Wu,Lifang Liu,Shurong Wang,Pengfei Wang,Hongyuan Guo
A novel approach for electrochemical detection of glucose has been developed by flower-like copper oxide-carboxylated graphene (CuO-CG) nanocrystals modified electrode. The modified electrode was constructed by the electrodeposition method. CG and copper were successively electrodeposited on a bare glassy carbon electrode (GCE), and then CuO was formed in situ by electrochemical oxidization of the copper film to obtain the final CuO-CG-GCE. Electrocatalytic activity of the CuO-CG-GCE towards glucose oxidation was explored using cyclic voltammetry. The oxidation peak current of glucose obtained by CuO-CG-GCE was more than 130-fold higher than that of the bare GCE . The CuO-CG-GCE could detect glucose from 0.1 μM to 3.17 mM by chronoamperometry with a limit of detection of 10 nM, sensitivity of 1295 μA mM −1 cm −2 , and response time of 1 ∼ 4 s. These results suggested that the CuO-CG nanocrystals could become promising electrode materials for electrochemical sensors.
研究领域:
生物传感器
·
电化学分析
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Zhuan-li Bao,Hui Zhong,Xiao-rong Li,An-ran Zhang,Yi-xin Liu,Ping Chen,Zhi-peng Cheng,Hai-yan Qian
Herein, a novel electrochemical sensor based on core-shell Au@Ag nanoparticles deposited on carboxylated graphene (CG) was constructed for the simultaneous electrochemical determination of nitrite (NO 2 − ) and iodide (I − ). The CG/Au@Ag nanocomposite was prepared via two-step simple chemical reduction method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the CG/Au@Ag nanocomposite. Au@Ag nanoparticles were distributed on the CG surface, providing more active sites for the electrocatalytic active center. The strong synergistic effect between Au@Ag nanoparticles and CG improved the conductivity of nanoparticles and provided a significant electrocatalytic performance on the flexible sensor. The CG/Au@Ag modified electrode showed a wide linear concentration range of 2.5–1250 μM, a low detection limit of 0.15 μM for NO 2 − and corresponding linear ranges of 3.5–1000 μM (peak I) and 500–1000 μM (peak II), and the detection limit of 0.1 μM for I − . It also demonstrated good anti-interference ability against various common interfering substances. Finally, the sensing platform was successfully applied to simultaneous determination of NO 2 − and I − in real samples. The present electrochemical strategy is promising to broaden the practical electrochemical application in environment.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Gengqi Xing,Bin Luo,Junqing Qin,Xiaodong Wang,Peichen Hou,Han Zhang,Cheng Wang,Jianshu Wang,Aixue Li
Methyl jasmonate (MeJA) is an endogenous plant hormone, which plays an important role in agriculture production. A novel probe-free electrochemical immunosensor was fabricated for detecting of MeJA. Fc , carboxylated graphene (COOH-GR) and carboxylated multi-walled carbon nanotubes (COOH-MWNT) composite was formed and used to fabricate screen-printed electrode (SPE). Fc was used as the electronic medium. COOH-GR and COOH-MWNT were used to improve the conductivity and catalytic activity of the sensor and to immobilize the MeJA antibody. Thus, the immunosensor can be used to detect MeJA without external redox probe solution. The designed sensor can detect MeJA in a wide range of 100 fM-100 μM, and its detection limit is as low as 31.26 fM (S/N = 3). The as-prepared probe-free immunosensor is simple, low cost, and does not need redox probe solutions for measurements, which shows great promise for future application in precision agriculture.
研究领域:
植物学
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农业科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Suozhu Wu,Yue Zhang,Lifang Liu,Weixing Fan
A nonenzymatic glucose biosensor based on conifer-like copper-carboxylated graphene nanocomposites modified gold electrode has been developed. Electrochemical detection of glucose by the proposed sensors was performed using cyclic voltammetry and chronoamperometry. The proposed electrode exhibited good electrocatalytic activity towards glucose oxidation. And the proposed sensors showed excellent performances for glucose detection, including very low limit of detection of 7.96 nM, fast response time of 2 s, wide linear response range from 0.1 μM to 5.48 mM, high sensitivity of 1142 μA mM −1 cm −2 and good selectivity. Moreover, the proposed sensors could be successfully applied for detection of glucose in human serum.
研究领域:
生物传感
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
An-ran Zhang,Hui Zhong,Xiao-rong Li,Zhuan-li Bao,Zhi-peng Cheng,Yu-jie Zhang,Ping Chen,Zai-chao Zhang,Li-li Zhang,Hai-yan Qian
An electrochemiluminescence (ECL) sensor was developed with carboxylated graphene-loaded Au@Ag core-shell nanoparticles . Scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM) and inductive coupling plasma (ICP) were applied to characterizing COOH-G/Au@Ag nanocomposites . Electrochemical performance of the nanocomposites was evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Based on ECL experimental results, we can find COOH-G/@Au@Ag nanocomposites have good electrocatalytic ability for glucose, so we construct a glucose electrochemiluminescence (ECL) sensor. When the glucose concentration range is from 0.005 to 1500 μM, the linear response of ECL intensity to glucose concentration was valid with detection limit of 0.02 μM. In addition, the developed sensor not only has good stability, repeatability and sensitivity for the detection of glucose, but also can be successfully used for glucose monitoring in human serum samples.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
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IF 3.473
Ning Pan,Debin Guan,Yuntao Yang,Zhenling Huang,Ruibing Wang,Yongdong Jin,Chuanqin Xia
We report a rapid, environmentally-friendly and cost-effective route for the preparation of a graphene-based nanomaterial, carboxyl graphene (aka. reduced graphene oxide , RGO) from graphene oxide (GO). Carboxyl graphene was prepared on the scale of several grams through the reduction of GO by thiourea dioxide (TUD) at a relatively low temperature (40 °C) in an alkaline medium (pH = 10). The reduction of GO was confirmed by FT-IR, UV–vis, X-ray photoelectron, and Raman spectroscopy. In addition, this reduction was also confirmed by thermal gravimetric analysis, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Characterizations of these materials demonstrated that selective reduction of the epoxy and carbonyl groups occurred on the surface of GO, while carboxyl groups were left behind. In addition, the conjugation of the carbons in the structure was restored through this reduction and a single-layer of carboxyl graphene (with a thickness of 0.80 nm, as observed by AFM) was obtained under these conditions. Carboxyl graphene had a high surface area (of 454.52 m 2 g −1 ) and contained approximately 6.9 ± 1.6 mmol of carboxyl groups per gram of material, as determined via Boehm titration. The mechanism for selective reduction of the epoxy and carbonyl groups on GO to form carboxyl graphene by TUD is proposed and discussed in detail.
研究领域:
纳米材料化学
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材料科学
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表面化学
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碳基纳米材料
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功能化纳米材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2016
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IF 3.902
Junyu Chen,Xin Zhang,He Cai,Zhiqiang Chen,Tong Wang,Lingling Jia,Jian Wang,Qianbing Wan,Xibo Pei
The aim of this study was to prepare nanocomposites of carboxylated graphene oxide (GO-COOH) sheets decorated with zinc oxide (ZnO) nanoparticles (NPs) and investigate their advantages in the field of bone tissue engineering. First, ZnO/GO-COOH nanocomposites were synthesized by facile reactions, including the carboxylation of graphene oxide (GO) and the nucleation of ZnO on GO-COOH sheets. The synthesized ZnO/GO-COOH nanocomposites were then characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra, and transmission electron microscopy (TEM). The biocompatibility, osteogenic activity and antibacterial effect of ZnO/GO-COOH nanocomposites were further investigated. In the nanocomposites, ZnO nanoparticles with a size of approximately 12 nm were uniformly decorated on GO-COOH sheets. Compared with GO-COOH and the control group, ZnO/GO-COOH nanocomposites significantly enhanced ALP activity, osteocalcin production and extracellular matrix mineralization as well as up-regulated osteogenic-related genes (ALP, OCN, and Runx2) in MG63 osteoblast-like cells. Moreover, ZnO/GO-COOH nanocomposites had an antibacterial effect against Streptococcus mutans . These results indicated that ZnO/GO-COOH nanocomposites exhibited both osteogenic activity and antibacterial effect and had great potential for designing new biomaterials in the field of bone tissue engineering.
研究领域:
材料科学
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生物医学工程
·
生物材料
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 26
·16688-16695
·
IF 4.036
Gengqi Xing,Cheng Wang,Ke Liu,Bin Luo,Peichen Hou,Xiaodong Wang,Hongtu Dong,Jianshu Wang,Aixue Li
Methyl jasmonate (MeJA) is an important phytohormone which can regulate plant growth and stress tolerance. It is very necessary to develop sensitive and accurate detection methods for MeJA. In this work, a probe-free electrochemical immunosensor for MeJA detection was developed based on a Cu-MOF–carboxylated graphene oxide (COOH-GO) platform. The Cu2+ in the Cu-MOFs was used to provide redox signals, which avoids the application of an external redox probe in the electrolyte solutions as conventional immunosensors. COOH-GO was used to improve the structural stability and provide more sites for binding MeJA antibodies. The linear range of the MeJA immunosensor is from 10 pM to 100 μM, which can cover the whole concentration range of MeJA in most plants. And its detection limit is very low (0.35 pM), and it can detect very low concentrations of MeJA. This immunosensor is simple, low cost, and does not need redox probe solutions for measurements. It shows remarkable potential for on-site application in precision agriculture.
研究领域:
植物科学
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分析化学
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环境科学
·
农业科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhiyan Sui,Zhe Wang,Yan Wang
Using carboxylated graphene oxide (CFGO) as inorganic crosslinking agent, a series of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) based complex anion exchange membranes (AEMs) with pyridine cations as conduction sites were prepared successfully. The carboxyl modification can improve the dispersibility of inorganic filler in the polymer and provide more crosslinking sites. At the same time, the two-dimensional layered structure of CFGO and a large number of hydrophilic groups provide good ion transport channels. As a result, compared with the original membrane, the crosslinked composite membranes showed better conductivity and chemical stability. Among them, the conductivity of AP-PPO-CFGO2 reached 102.41 mS/cm at 80 °C, and retained about 70% of the conductivity after soaking in 2 M NaOH for 800 h. Furthermore, the AP-PPO-CFGO2 displayed a power density of 277.5 mW/cm 2 in a H 2 /O 2 single cell test at 80 °C.
研究领域:
材料科学
·
化学工程
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电化学
·
燃料电池
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Caihong Li,Jian Li,Xiaodi Yang,Ling Gao,Lijun Jing,Xiaoling Ma
A novel electrode fabrication method was designed to establish a highly sensitive label-free electrochemical aptasensor for myoglobin (Mb) detection. The aptasensor was successfully built by grafting Mb-binding-aptamer (MBA) onto the surface of Au nanoparticles/arginine-glycine-aspartic/carboxylated graphene/glassy carbon electrode (Au/RGD/GR-COOH/GCE). Raman spectroscopy was used to demonstrate the process of successful electrode fabrication. Circular dichroism (CD) spectroscopy was performed to estimate the change of secondary structure of MBA in different modified electrodes. The scan rate, pH, the binding time of MBA, adsorption time and adsorption temperature of Mb were optimized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The DPV was also employed to recognize Mb and excellent performance was possessed with a detection limit of 26.3 ng mL −1 (S/N = 3) and a linear range from 0.0001 to 0.2 g L −1 . Moreover, the fabricated aptasensor also exhibited good reproducibility, stability and anti-interference capacity. The aptasensor was applied to biochemical assays and the results were satisfactory. The detection method was successfully built, which could provide a promising platform for evaluation of meat quality.
研究领域:
分析化学
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食品科学
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生物化学
·
纳米技术
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产品关联
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 7
·546
·
IF 5.743
Shihong Xu,Yu Deng,Jinping Luo,Yaoyao Liu,Enhui He,Yan Yang,Kui Zhang,Longze Sha,Yuchun Dai,Tao Ming,Yilin Song,Luyi Jing,Chengyu Zhuang,Qi Xu,Xinxia Cai
Both the cellular- and population-level properties of involved neurons are essential for unveiling the learning and memory functions of the brain. To give equal attention to these two aspects, neural sensors based on microelectrode arrays (MEAs) have been in the limelight due to their noninvasive detection and regulation capabilities. Here, we fabricated a neural sensor using carboxylated graphene/3,4-ethylenedioxythiophene:polystyrenesulfonate (cGO/PEDOT:PSS), which is effective in sensing and monitoring neuronal electrophysiological activity in vitro for a long time. The cGO/PEDOT:PSS-modified microelectrodes exhibited a lower electrochemical impedance (7.26 ± 0.29 kΩ), higher charge storage capacity (7.53 ± 0.34 mC/cm2), and improved charge injection (3.11 ± 0.25 mC/cm2). In addition, their performance was maintained after 2 to 4 weeks of long-term cell culture and 50,000 stimulation pulses. During neural network training, the sensors were able to induce learning function in hippocampal neurons through precise electrical stimulation and simultaneously detect changes in neural activity at multiple levels. At the cellular level, not only were three kinds of transient responses to electrical stimulation sensed, but electrical stimulation was also found to affect inhibitory neurons more than excitatory neurons. As for the population level, changes in connectivity and firing synchrony were identified. The cGO/PEDOT:PSS-based neural sensor offers an excellent tool in brain function development and neurological disease treatment.Keywords:neural sensor;porous graphene;PEDOT;neurons;learning
研究领域:
神经科学
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生物医学工程
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材料科学
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电生理学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）