KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Jian Wu,Cheng Zhang,Jin Feng Xia,Dan Yu Jiang
In this study, Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the WS2 sensing electrode (SE) were fabricated and examined for NO2 sensing properties. Due to its internal stratiform structure, surface and edge of the lamella have high chemical activity, WS2 was used as a kind of highly efficient catalyst. WS2 was partial oxidated to WO3 at 400°C, and with the increment of temperature, oxidation will accelerate. The ΔEMF to 500 ppm NO2 was as high as 125mv at 400°C, while the value of WO3-based sensor was as small as 10 mv in the same condition. These WS2-attached devices gave a linear correlation between EMF and the logarithm of NO2 concentration from 30 to 500 ppm in the temperature range 350–500°C. The response time of the device is about 1 min at 400°C.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
NANO
·
2016
·
IF 0.951
Liang Yan,Zhicheng Li,Shaojun Zhang
In this study, a film of electrochemically reduced graphene oxide (ERGO) deposited onto a glassy carbon electrode (GCE) was prepared through the pulse potential method (PPM). The as-prepared film was characterized via scanning electron microscopy (SEM) and cyclic voltammetry (CV). The ERGO film was applied for the first time to develop a highly sensitive electrochemical sensor for imidacloprid determination. Results revealed that the ERGO film can effectively increase response towards imidacloprid reduction by significantly enhancing the reduction peak currents and decreasing the over potential of imidacloprid. Under optimum conditions, the modified electrode showed a linear voltammetric response to imidacloprid at concentrations ranging from 3 . 0 × 1 0 − 8 mol L − 1 to 1 . 1 × 1 0 − 6 mol L − 1 , with a detection limit of 1 . 0 × 1 0 − 8 mol L − 1 . The developed electrode is potentially a good candidate for imidacloprid determination. The proposed method provides a good recovery rate of imidacloprid in spiked practical samples, such as lake water and tap water.
研究领域:
分析化学
·
环境监测
·
电化学
·
农药残留检测
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 14
·H1033
·
IF 3.259
Fei Wang,Kang Ding,Can Zhang,Wenke Jia,Kui Lu,Yingjie Ye
In this work, pulse potential method (PPM) was presented to fabricate directly three dimensional graphene-carbon nanotubes (3DG-CNTs) network on the surface of glassy carbon electrode (GCE). The morphological and characteristic of 3DG-CNTs network were investigated by means of Raman spectra, scanning electron microscopy (SEM) and electrochemical experiments. The 3DG-CNTs network as a new voltammetric material was applied in developing a high-sensitive electrochemical sensor for determination of maltol. Under the optimum conditions, the electrochemical response showed a linear relationship with maltol concentrations in the range of 5.0 × 10−8 ∼ 4.5 × 10−6 mol L−1 and 1.0 × 10−5 ∼ 2.0 × 10−3 mol L−1, and a low detection limit of 1.0 × 10−8 mol L−1 was achieved for maltol. Moreover, the proposed method exhibited an excellent selectivity, stability, reproducibility and repeatability, which make it very suitable for a potential choice for determination of maltol in food matrices.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 162
·期 6
·H352
·
IF 3.266
Fei Wang,Yi Cao,Bingying Zhang,Lin Gao,Junda Ge
We presented to fabricate the electrodeposition of the film of reduced graphene oxide (ERGO) with preferred vertical orientation on the glassy carbon electrode through pulse potential method (PPM). The ERGO film were characterized by electrochemical methods and scanning electron microscopy. For the first time, the electrodeposition of the film was applied to develop a highly sensitive electrochemical sensor for determination of sophocarpine. The electrochemical behavior of sophocarpine was then studied by cyclic voltammetry. The results revealed that the ERGO film can effectively increase response toward the oxidation of sophocarpine by greatly enhancing the oxidation peak currents and decrease the overpotential of sophocarpine. Under the selected conditions, the sensor showed good amperometric response for sophocarpine within a wide linear range from 1.0 × 10−6 to 1.0 × 10−4 mol L−1 and a low detection limit of 3.0 × 10−7 mol L−1. At the same time, the method was also successfully applied to the quantitative determination of sophocarpine in spiked human urine and its result was satisfactory.
研究领域:
分析化学
·
生物医学工程
·
药物分析
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Kelei Zhuo,Yujing Wei,Jingjing Ma,Yujuan Chen,Guangyue Bai
Several alkylmethylimidazolium tetraphenylborates (C n mim-TPB, n = 2–10) were synthesized and explored as ion exchangers in plasticized PVC membranes with very attractive sensing behaviors. And then a series of ion-selective electrodes (ISEs) were prepared and their potentiometric properties were investigated. The proposed electrodes exhibited Nernstian responses to alkylmethylimidazolium-based ionic liquid cations [C n mim] + . These electrodes were successfully applied in the determination of thermodynamic parameters of ionic liquids in aqueous solutions and in the detection of [C n mim] + in tap water and distilled water with satisfactory results. For the as-prepared ISEs, one special and important relationship was observed between the selectivity coefficients and the length of alkyl side chains of interfering cations [C n mim] + . The proper understanding of this relationship should facilitate the development of new method for the determination of ionic liquids using ISEs.
研究领域:
分析化学
·
电化学
·
环境监测
·
离子传感
·
药物分析
·
水处理
·
生物传感器
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）