SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Li Fu,Aiwu Wang,Kefeng Xie,Jiangwei Zhu,Fei Chen,Henggang Wang,Huaiwei Zhang,Weitao Su,Zhenguang Wang,Cangtao Zhou,Shuangchen Ruan
Sensitive and low-cost determination of Ag + is important due to the potential risk of Ag + increasingly applied in various fields. In this work, we report an extremely simple electrochemical sensor for the Ag + determination based on the sulfur quantum dots (SQDs) modified Au electrode. The SQDs were synthesized by a top-down method through alkali etching of bulk sulfur powder, which were then directly used for Au electrode surface modification due to the high affinity between Au and S atoms. The strong binding between Ag and S makes the modified electrode highly sensitive for Ag + sensing. The theoretical investigation was carried out by calculating the bond length and binding strength between Ag and S. Since the non-conductive nature of the SQDs, the amount of modifier is a crucial factor for the sensing performance. Under optimum condition, the proposed sensor showed a linear detection range of 0.1 nM to 3 μM with a detection limit of 71 pM.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
Green Energy & Environment
·
2019
·
IF 0
Tongtong Liu,Kai Wang,Yongxiu Chen,Shuangliang Zhao,Yongsheng Han
Here we report a strategy to enhance the energy density of supercapacitors by increasing the utilization rate of the specific surface area (SSA) via wettability improvement. The nonporous gold (NPG) film is used as the electrodes and the ionic liquid [EMIM]BF 4 is the electrolyte. When the electrode is coated by paraffin, an increase of the contact angle leads to a remarkable reduction of the specific capacitance. While when acetonitrile is added into the electrolyte, the contact angle is decreased and the utilization rate of SSA is improved, which results in an increase of the specific capacitance. The addition of isopropyl acetate into the electrolyte leads to a further increase of the specific capacitance. To generalize the role of the wettability in improving the energy density, a carbon-based electrode is evaluated in the solution of potassium hydroxide. An addition of propyl alcohol into the potassium hydroxide solution leads to an increase of the specific capacitance, as well as a long-term stability of the supercapacitor. The role of conductivity in this study is excluded by designing experiments. This paper highlights the significance of wettability in determining the specific capacitance, showing an alternative to improve the energy density of supercapacitors.
研究领域:
材料科学
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电化学
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产品关联
DOI
ANALYTICA CHIMICA ACTA
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2012
·
IF 4.555
Dongyue Li,Jing Li,Xiaofang Jia,Yanchao Han,Erkang Wang
A simple, rapid and sensitive sensing platform for the detection of As(III) has been fabricated in neutral media based on the mercaptoethylamine modified Au electrode. A wide detection range of 0.2–300 μg L −1 and a low detection limit of 0.02 μg L −1 were obtained with a preconcentration time of 100 s under optimal conditions. Compared with previous studies, this work shows obvious advantages that it not only suppresses the Cu(II) interference, but also can detect the As(III) in natural water samples at the original pH avoiding high concentration acidic media. Moreover, the practical application of the proposed method was verified in the lake water sample determination.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Current Research in Food Science
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2022
·
IF 6.269
Zihao Wang,Ayuan Xiong,Yougui Yu,Qing Zheng
The development of low-alcohol liquor (Baijiu) can represent a tool to solve the problems of excessive alcohol intake. However, low-alcohol liquor has an insufficient ester aroma and a bland taste due to the alcohol dilution process. This study proposes an electrochemical catalysis technology to catalyze the esterification reaction between the acid and alcohol in liquor, thereby enhancing the ester aroma of low-alcohol liquor. In the electrochemical conversion process, the gold electrode with a certain potential promotes the formation of carbocation intermediate from corresponding carboxylic acid, thereby improving the esterification reaction efficiency. The key finding is that the total ester content of liquor treated using this technology is increased by more than 20%, and a strong ester aroma is attained. This study clarifies the electrocatalytic mechanism of the esterification reaction in liquor, and provides a new idea for making low-alcohol liquor become more attractive for aroma and taste aspects trying to obtain an alternative product contributing to the public health.
研究领域:
食品科学
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化学工程
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生物催化
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DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2012
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IF 4.859
Yuehong Pang,Zhaoqiang Ge,Yong Liu,Xiaofang Shen
Covalently conjugating folate on Au surface was achieved via click chemistry, copper (I)-catalyzed azide-alkyne cycloaddition reaction. Human leukemia K562 cells were used as a model system to investigate capturing cancer cells by folate-targeted electrode. Scanning optical microscopy and electrochemical method were used to monitor the capture of K562 cells on folate-clicked electrode.
研究领域:
生物化学
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医学工程
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分子生物学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Wan Wang,Hua Bai,Haiyu Li,Qing Lv,Qing Zhang,Ning Bao
Fabrication of disposable gold working electrodes in bulk is desirable for their extensive application in electrochemical detection . In this paper the gold film electrodes were prepared by sputtering the gold film with the thickness of ∼12 nm on the double sided conductive carbon tape. The gold film coated carbon tape could be used like stickers with small square pieces and attached on ITO glass for fabrication of disposable gold film electrodes. The electrochemical responses of the gold film modified electrodes on Cr(VI) in acidic solutions were similar to previous gold electrodes, suggesting the similar mechanism as before. Cr(VI) could be determined by the amperometric method with the detection limit of 0.7 μg L −1 (0.013 μM), which was significantly improved compared with previously reported disposable gold-based electrodes. The batch-by-batch (n = 20) reproducibility of the fabricated electrodes was 7.3% at 50 μg L −1 and 3.8% at 5.0 mg L −1 , respectively. The disposable electrodes could be applied to quantify Cr(VI) in real samples including plastics, tap water and lake water with results in agreement with those obtained with HPLC-ICP-MS. This study provides a simple and effective alternative for preparation of disposable gold film electrodes.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Hao Wan,Qiyong Sun,Haibo Li,Fei Sun,Ning Hu,Ping Wang
This paper presents a fast and sensitive approach for simultaneous electrochemical determination of lead and copper based on a commercial screen-printed gold electrode (SPGE) with gold nanoparticles (GNPs) modification. The influence of activation in sulfuric acid was discussed that the active surface area of SPGE was 1.65 times that of SPGE without activation. Deposition time for GNPs modification was optimized to be 150 s with a higher electrochemical response. Significantly enhanced electrochemical performance was observed in both cyclic voltammetry (CV) and square wave anodic stripping voltammetry (SWASV) compared to that of merely activated SPGE. To detect lead and copper qualitatively and quantitatively, deposition potential and deposition time were respectively optimized to be −0.5 V and 120 s. The GNPs modified SPGE presented a sensitivity of 0.154 μA/ppb and 0.084 μA/ppb towards lead and copper with a correlation coefficient of 0.9792 and 0.9896. GNPs modified SPGE revealed a wide detection range of lead from 20 ppb to 200 ppb with a limit of detection of 2.2 ppb and copper from 20 ppb to 300 ppb with a limit of detection of 1.6 ppb. Reproducibility and consistency of different GNPs modified SPGEs were investigated to verify the performance. The electrochemical behaviour of integrated pseudo-reference and counter electrode was compared with that of commercial electrodes in detail. The results exhibited a reliable approach for lead and copper detection simultaneously with high sensitivity, linearity and low limit of detection.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
MOLECULES
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2022
·Vol. 27
·期 14
·4578
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IF 4.927
Zheng Wei,Xiaoping Cai,Weifeng Cui,Junping Zhang
A CA19-9 electrochemical immunosensor was constructed using a hybrid self-assembled membrane modified with a gold electrode and applied to detect real samples. Hybrid self-assembled membranes were selected for electrode modification and used to detect antigens. First, the pretreated working electrodes were placed in a 3-mercaptopropionic acid (MPA)/β-mercaptoethanol (ME) mixture for 24 h for self-assembly. The electrodes were then placed in an EDC/NHS mixture for 1 h. Layer modification was performed by stepwise dropwise addition of CA19-9 antibody, BSA, and antigen. Differential pulse voltammetry was used to characterize this immunosensor preparation process. The assembled electrochemical immunosensor enables linear detection in the concentration range of 0.05–500 U/mL of CA19-9, and the detection limit was calculated as 0.01 U/mL. The results of the specificity measurement test showed that the signal change of the interfering substance was much lower than the response value of the detected antigen, indicating that the sensor has good specificity and strong anti-interference ability. The repeatability test results showed that the relative standard deviations were less than 5%, showing good accuracy and precision. The CA19-9 electrochemical immunosensor was used for the actual sample detection, and the experimental results of the standard serum addition method showed that the RSD values of the test concentrations were all less than 10%. The recoveries were 102.4–115.0%, indicating that the assay has high precision, good accuracy, and high potential application value.Keywords:self-assembled membrane;gold electrode;electrochemical immunosensor;CA19-9;gastric cancer
研究领域:
分析化学
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生物传感器
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癌症诊断
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY
·
2015
·Vol. 83
·期 3
·155-160
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IF 1.033
Yan-qing LI,Ying LUO,Li-jun LI,Hao CHENG,Wen-yi HUANG
In order to establish a simple, sensitive and rapid method for the determination of azithromycin, the gold electrode modified with Silica sol/Nano-Au/PVP/Ru(bpy)32+ was prepared, and the electrochemiluminescence (ECL) method was developed for the determination of azithromycin based on the sensitizing effect of azithromycin on Ru(bpy)32+. Moreover, the electrochemical behaviors and the electrochemical luminescence behaviors of the Ru(bpy)32+ system and the Ru(bpy)32+- azithromycin system were investigated by ECL respectively. The results show that the proposed electrode showed very good electrochemical activity and electrochemiluminescence response to the Ru(bpy)32+- azithromycin system, under the optimum experimental condition, the linearity of azithromycin concentration to ECL intensity was achieved in the concentration of azithromycin from 1.0 × 10−7 to 1.0 × 10−4 mol L−1 and the detection limit (S/N = 3) was 1.33 × 10−9 mol L−1. Through the parallel determination of 1.0 × 10−5 mol L−1 azithromycin for 8 times, the RSD of results was 1.82%, and the recovery ranging from 97.9% to 101.6% was obtained in the detection of azithromycin tabelets and the RSD was 1.36% (n = 5). The proposed method showed high selectivity and sensitivity and simplicity, and it could be applied to the analysis of azithromycin with satisfactory results.
研究领域:
分析化学
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药物分析
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生物医学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
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IF 6.215
Zhong Wang,Hongfu Gao,Jiwen Cui,Shi Zhou,Yanli Zhao,Cai Ye,Jinlian Li,Dongmei Wu
Establishment of new method for evaluation microbial viability has become an urgent need in the fields of biology, medicine, environment and so on. In this paper, two electrochemical signals of Staphylococcus aureus ( S. aureus ) at + 0.693 and + 0.973 V vs. Ag/AgCl ( sat . KCl) were detected on the multi-walled carbon nanotube modified glassy carbon electrode (MWCNTs/GCE), and attributed to the oxidation of guanine and adenine secreted by S. aureus . For the first time, bacterial viability was evaluated from the perspective of proliferation and purine metabolism. Compared with the plate counting method, the electrochemical signals of guanine and adenine showed an earlier change of viability when S. aureus entered stationary from logarithmic phase and apoptotic from stationary phase during the growth process of S. aureus . There were good linear relationships between electrochemical signals of guanine and adenine and the number of S. aureus cells in different growth phases, but there were different detection thresholds. At the logarithmic phase, S. aureu s had stronger viability and ability to metabolize purines, which resulted in a lower detection threshold. Both electrochemical signals of bacteria could well reflect the inhibition of levofloxacin on S. aureus viability, and the guanine signal peak was closer to the result of plate counting method.
研究领域:
微生物学
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电化学
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医学检测
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 11
·1-15
·
IF 2.253
Jiang Xiangqian,Ban Chuncheng,Li Ling,Chen Weiping,Liu Xiaowei
In this paper, a low-dimensional boron nitride nanoribbon with ultra-large aspect ratio was successfully prepared. Attractively, the singe BNNR, which carries the different metal electrode materials, exhibits excellent ohmic contact properties. The contact characteristics between single BNNR and Aurum electrode are better than Platinum electrode and Aluminum electrode. In addition, C-doping will change the semiconductor behavior of BNNR into metal behavior and the electrons have more chances to penetrate the barrier directly and reduce the ohmic contact resistance of the device which is of great significance in the design, assembly, and fabrication of high-performance semiconductor devices and the research of high-power radioresistance devices.
Graphical abstract
研究领域:
材料科学
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电子工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Lu Yang,Nan Wu,Rongrong Bai,Minjiao Chen,Weiliang Dong,Jie Zhou,Min Jiang
We report a facile strategy for the detection of pyruvate in fermentation progress based on a non-enzymatic decarboxylation reaction of pyruvate with hydrogen peroxide (H 2 O 2 ), coupled with a horseradish peroxidase (HRP)-incorporating nanomaterial as an enzyme element to replace conventional pyruvate oxidase (POX). HRP-Cu 3 (PO 4 ) 2 •3H 2 O nanoflowers (HRP-CuP NFs) and thiol graphene (tG) were immobilized onto an Au disk electrode via layer-by-layer assembly to construct an improved amperometric H 2 O 2 biosensor. The as-prepared HRP-CuP NF/tG/Au electrode exhibited a high electrocatalytic performance toward H 2 O 2 , showing a sensitive response of 67.6 μA mM -1 cm -2 , as well as a linear range from 0.1-8.2 mM with a detection limit (LOD) of 0.06 mM (S/N=3). Furthermore, the resulting biosensor also demonstrated a linear range for pyruvate detection from 1.0 to 8.0 mM with LOD of 0.3 mM (S/N=3), under a working potential of -0.3 V. Finally, the biosensor was successfully used for the determination of pyruvate in real microbial fermentation processes without pretreatment, showing an excellent correlation coefficient compared to the standard HPLC assay with RSD values of 3.03-6.45%. This work provides a new approach for the design and preparation of portable sensors for indirect pyruvate detection with high performance, low cost, and easy operation.
研究领域:
生物化学
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传感器技术
·
发酵工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）