Ahammad A J Saleh, Odhikari Noyon, Shah Syed Shaheen, Hasan Md Mahedi, Islam Tamanna, Pal Poly Rani, Ahmed Qasem Mohammed Ameen, Aziz Md Abdul
Department of Chemistry, Jagannath University Dhaka 1100 Bangladesh
Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia
Nanoscale Adv. 2018 Oct 4;1(2):613-626. doi: 10.1039/c8na00090e. eCollection 2019 Feb 12.
A novel porous tal palm carbon nanosheet (PTPCN) material was synthesized from the leaves of (tal palm) and used for developing an electrochemical sensor through modifying a glassy carbon electrode (GCE) simply by drop-casting on it a solution of the material for the sensitive simultaneous detection of dopamine (DA) and uric acid (UA), even in the presence of interfering species. The drop-casting solution was prepared by simply dispersing the PTPCNs in ethanol without using any other binding materials ( Nafion). The surface morphologies of the PTPCNs were studied through field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction spectroscopy (XPS) studies revealed the chemical composition of the PTPCNs' surface. Their structural properties were studied using X-ray diffraction (XRD) and Raman spectroscopy. Brunauer-Emmett-Teller (BET) analysis confirmed the surface area and pore volume to be 1094.53 m g and 0.74 cm g, respectively, while Barrett-Joyner-Halenda (BJH) pore-size distribution showed the average pore size to be 22 nm. The sufficiently large surface area and pore-size distribution suggested better electrocatalytic properties compared to the average modifying materials. The modified electrode (PTPCNs/GCE) was characterized through impedimetric and CV techniques in standard potassium ferricyanide solution for evaluating their charge-transfer resistance and electrochemical properties. The limits of detection (S/N = 3) were 0.17 μM and 0.078 μM and the sensitivities were 1.2057 μA μM cm and 2.693 μA μM cm for UA and DA, respectively. The possible interactions that took place between the PTPCNs and the analytes that aided in the enhancement of the electroanalytical performance of the PTPCNs/GCE are discussed based on the experimental findings and established theoretical concepts. The PTPCNs/GCE was successfully employed for analyzing real samples, like dopamine injection and urine.
一种新型的多孔酒椰棕榈碳纳米片（PTPCN）材料由酒椰棕榈叶合成，并通过将该材料溶液滴铸在玻碳电极（GCE）上用于开发电化学传感器，以灵敏地同时检测多巴胺（DA）和尿酸（UA），即使存在干扰物质。滴铸溶液是通过将PTPCN简单分散在乙醇中而制备的，无需使用任何其他粘结材料（如Nafion）。通过场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）和高分辨率TEM（HRTEM）研究了PTPCN的表面形貌。能量色散X射线光谱（EDS）和X射线光电子能谱（XPS）研究揭示了PTPCN表面的化学成分。使用X射线衍射（XRD）和拉曼光谱研究了它们的结构性质。Brunauer-Emmett-Teller（BET）分析证实表面积和孔体积分别为1094.53 m²/g和0.74 cm³/g，而Barrett-Joyner-Halenda（BJH）孔径分布显示平均孔径为22 nm。与普通修饰材料相比，足够大的表面积和孔径分布表明其具有更好的电催化性能。在标准铁氰化钾溶液中通过阻抗和循环伏安（CV）技术对修饰电极（PTPCNs/GCE）进行了表征，以评估其电荷转移电阻和电化学性质。尿酸（UA）和多巴胺（DA）的检测限（S/N = 3）分别为0.17 μM和0.078 μM，灵敏度分别为1.2057 μA/（μM·cm²）和2.693 μA/（μM·cm²）。基于实验结果和已确立的理论概念，讨论了PTPCN与分析物之间可能发生的有助于提高PTPCNs/GCE电分析性能的相互作用。PTPCNs/GCE已成功用于分析实际样品，如多巴胺注射液和尿液。
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