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A highly conductive thin film composite based on silver nanoparticles and malic acid for selective electrochemical sensing of trichloroacetic acid
Analytica Chimica Acta ( IF 5.7 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.aca.2018.06.084
R.M. Bashami , M. Tahir Soomro , Amna N. Khan , Elham S. Aazam , Iqbal M.I. Ismail , M.S. El-Shahawi

A highly conductive thin film composite based on silver nanoparticles (AgNPs) and malic acid (MA) was deposited on glassy carbon electrode (GCE) for the selective and sensitive electrochemical sensing of trichloroacetic acid (TCA). The casting solution containing MA functionalized AgNPs was employed as a precursor for the thermal deposition of the AgNPs integrated MA thin film composite onto the GCE surface. The uniform coverage of AgNPs within the thin film composite at GCE was obtained by field emission scanning electron microscopy (FESEM). A significantly high charge transfer resistance of the modified electrode (85.7 Ω for AgNPs-MA/GCE in 2 mM [Fe(CN)6]3-/4- at a bias of +0.235 V as compared to bare GCE (38.01 Ω) verified the optimum coating of AgNPs-MA composite at the surface of the electrode. The AgNPs-MA composite deposited GCE revealed substantial electrocatalytic activity toward TCA reduction with significantly enhanced reduction current. The novel electrode manifested a linear square wave voltammetric (SWV) response over the concentration ranges of 0.1-2 (R2 = 0.9953) and 4-100 μM (R2 = 0.9969) with a limit of detection (LOD) and limit of quantification (LOQ) of 30 nM and 92.5 nM, respectively. The modified electrode exhibited an excellent long-term stability (30 days) with the retention of >95% of initial current. The selectivity of the proposed electrode for the determination of TCA was examined in the presence of dichloroacetic acid (DCA) and monochloroacetic acid (MCA) with the retention of high recovery percentages.

中文翻译:

基于银纳米颗粒和苹果酸的高导电薄膜复合材料用于三氯乙酸的选择性电化学传感

基于银纳米粒子 (AgNPs) 和苹果酸 (MA) 的高导电薄膜复合材料沉积在玻璃碳电极 (GCE) 上,用于三氯乙酸 (TCA) 的选择性和灵敏的电化学传感。含有 MA 功能化的 AgNPs 的浇铸溶液被用作将 AgNPs 集成的 MA 薄膜复合材料热沉积到 GCE 表面上的前体。通过场发射扫描电子显微镜(FESEM)获得了 GCE 薄膜复合材料内 AgNPs 的均匀覆盖。与裸 GCE (38.01 Ω) 相比,修饰电极的电荷转移电阻非常高(2 mM [Fe(CN)6]3-/4- 中的 AgNPs-MA/GCE 为 85.7 Ω,偏置为 +0.235 V)验证了电极表面 AgNPs-MA 复合材料的最佳涂层。AgNPs-MA 复合沉积的 GCE 显示出对 TCA 还原具有显着增强的还原电流的显着电催化活性。新型电极在 0.1-2 (R2 = 0.9953) 和 4-100 μM (R2 = 0.9969) 的浓度范围内表现出线性方波伏安 (SWV) 响应,具有检测限 (LOD) 和定量限 (LOQ) ) 分别为 30 nM 和 92.5 nM。改性电极表现出优异的长期稳定性(30 天),初始电流保持率 > 95%。在二氯乙酸 (DCA) 和一氯乙酸 (MCA) 存在的情况下检查了用于测定 TCA 的拟议电极的选择性,同时保留了高回收率。新型电极在 0.1-2 (R2 = 0.9953) 和 4-100 μM (R2 = 0.9969) 的浓度范围内表现出线性方波伏安 (SWV) 响应,具有检测限 (LOD) 和定量限 (LOQ) ) 分别为 30 nM 和 92.5 nM。改性电极表现出优异的长期稳定性(30 天),初始电流保持率 > 95%。在二氯乙酸 (DCA) 和一氯乙酸 (MCA) 存在的情况下检查了用于测定 TCA 的拟议电极的选择性,同时保留了高回收率。新型电极在 0.1-2 (R2 = 0.9953) 和 4-100 μM (R2 = 0.9969) 的浓度范围内表现出线性方波伏安 (SWV) 响应,具有检测限 (LOD) 和定量限 (LOQ) ) 分别为 30 nM 和 92.5 nM。改性电极表现出优异的长期稳定性(30 天),初始电流保持率 > 95%。在二氯乙酸 (DCA) 和一氯乙酸 (MCA) 存在的情况下检查了用于测定 TCA 的拟议电极的选择性,同时保留了高回收率。改性电极表现出优异的长期稳定性(30 天),初始电流保持率 > 95%。在二氯乙酸 (DCA) 和一氯乙酸 (MCA) 存在的情况下检查了用于测定 TCA 的拟议电极的选择性,同时保留了高回收率。改性电极表现出优异的长期稳定性(30 天),初始电流保持率 > 95%。在二氯乙酸 (DCA) 和一氯乙酸 (MCA) 存在的情况下检查了用于测定 TCA 的拟议电极的选择性,同时保留了高回收率。
更新日期:2018-12-01
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