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Ce doped ZnO/f-MWCNT moss ball like nanocomposite: a strategy for high responsive current detection of L-tryptophan
Microchimica Acta ( IF 5.7 ) Pub Date : 2018-01-10 , DOI: 10.1007/s00604-017-2641-1
Dhanalakshmi Naganathan , Priya Thangamani , Thennarasu Selvam , Thinakaran Narayanasamy

AbstractAn electrochemical sensor is described for the determination of L-tryptophan (TRP). The method is based on the use of a glassy carbon electrode (GCE) modified with a nanocomposite consisting of moss ball-like cerium-doped ZnO and functionalized multiwalled carbon nanotubes (Ce-ZnO/f-MWCNT). Ce-doped ZnO was synthesized by a low temperature hydrothermal method. The Ce-ZnO/f-MWCNT nanocomposite was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, FTIR and field emission scanning electron microscopy. The nanocomposite was drop cast on a GCE for use in electrochemical detection of TRP via cyclic voltammetry and differential pulse voltammetry. The oxidation peak current (0.76 V vs. Ag/AgCl) is strongly improved compared to a bare GCE. The experimental parameters such as solution pH value, scan rate, stability, concentration, reproducibility and repeatability were optimized. Response is linear in the 10 to 100 nM TRP concentration range, the limit of detection is 1.2 nM, and the sensitivity is 2.59 μA·nM−1·cm−2. The electrode was applied to the determination of TRP in spiked real samples and gave satisfactory results. Graphical abstractSchematic presentation of the preparation of a moss ball like nanocomposite consisting of cerium-doped ZnO and functionalized MWCNTs. cerium-Deposited on a on glassy carbon electrode, it enables nanomolar detection of L-tryptophan by differential pulse voltammetry.

中文翻译:

Ce掺杂的ZnO/f-MWCNT苔藓球状纳米复合材料:L-色氨酸的高响应电流检测策略

摘要描述了一种用于测定 L-色氨酸 (TRP) 的电化学传感器。该方法基于使用纳米复合材料改性的玻璃碳电极 (GCE),该纳米复合材料由苔藓球状掺铈 ZnO 和功能化多壁碳纳米管 (Ce-ZnO/f-MWCNT) 组成。Ce掺杂的ZnO是通过低温水热法合成的。Ce-ZnO/f-MWCNT纳米复合材料通过X射线衍射、拉曼光谱、X射线光电子能谱、FTIR和场发射扫描电子显微镜进行表征。纳米复合材料滴铸在 GCE 上,用于通过循环伏安法和微分脉冲伏安法电化学检测 TRP。与裸 GCE 相比,氧化峰值电流(0.76 V vs. Ag/AgCl)得到了极大的改善。实验参数如溶液 pH 值、扫描速率、稳定性、浓度、重现性和重复性进行了优化。在 10 到 100 nM TRP 浓度范围内响应呈线性,检测限为 1.2 nM,灵敏度为 2.59 μA·nM-1·cm-2。该电极用于测定加标实际样品中的 TRP,结果令人满意。图形摘要:制备由掺杂铈的 ZnO 和功能化 MWCNT 组成的类似苔藓球的纳米复合材料的示意图。铈沉积在玻璃碳电极上,它可以通过差分脉冲伏安法对 L-色氨酸进行纳摩尔检测。该电极用于测定加标实际样品中的 TRP,结果令人满意。图形摘要:制备由掺杂铈的 ZnO 和功能化 MWCNT 组成的类似苔藓球的纳米复合材料的示意图。铈沉积在玻璃碳电极上,它可以通过差分脉冲伏安法对 L-色氨酸进行纳摩尔检测。该电极用于测定加标实际样品中的 TRP,结果令人满意。图形摘要:制备由掺杂铈的 ZnO 和功能化 MWCNT 组成的类似苔藓球的纳米复合材料的示意图。铈沉积在玻璃碳电极上,它可以通过差分脉冲伏安法对 L-色氨酸进行纳摩尔检测。
更新日期:2018-01-10
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