钒取代型多酸复合薄膜的制备及传感性能研究
发布时间：2019-05-22 14:43
【摘要】：本文采用层接层自组装的方法，用石墨烯、金纳米粒子或三联吡啶钌[Ru(bpy)3]修饰两种钒取代型多酸，分别在氧化铟锡玻璃（ITO）、石英和硅片上制备了两种复合薄膜：{PEI/[P2W16V2-Au/PDDA-rGO]8/P2W16V2}和{PEI/[PMo9V3/Ru(bpy)3/PSS/PDDA-rGO]5/PMo9V3}。 利用紫外-可见吸收光谱（UV-vis）对薄膜的增长进行监测，结果表明两种复合薄膜是均匀稳定增长的。利用原子力显微镜（AFM）和扫描电镜（SEM）对复合薄膜的表面形貌和粗糙度进行表征，结果显示薄膜表面呈微褶皱状，纳米粒子均匀分散在上面。通过X-射线光电子能谱（XPS）研究复合薄膜的组成，结果显示多酸、石墨烯、金纳米粒子或[Ru(bpy)3]均成功的沉积到薄膜上。采用安培计时法和循环伏安法（CV）研究了复合薄膜的电化学性质和传感尿酸（UA）或抗坏血酸（AA）的性质。电化学实验结果表明复合膜{PEI/[P2W16V2-Au/PDDA-rGO]8/P2W16V2}在pH=7的生理条件下对UA有良好的电化学活性，催化电位为0.43V，催化电流与UA浓度成良好的线性关系，检测范围是2.5×10-7~1.025×10-4M，，检测限是1.4×10-7M，灵敏度为0.24μM/μA。同时，该复合薄膜展示了良好的稳定性和重现性。实验中将其用于尿样中UA的检测，得到的平均回收率是100.4%，在催化电位0.43V下，可能的潜在干扰物质对其几乎没有响应。复合薄膜{PEI/[PMo9V3/Ru(bpy)3/PSS/PDDA-rGO]5/PMo9V3}在pH=6.5的PBS缓冲溶液可以用于检测AA，催化电位为0.15V。时间电流的线性分析得到复合薄膜对AA的检测范围是7.5×10-7~2.07×10-4M，检测限是1.0×10-7M，灵敏度为0.16μM/μA。该AA传感器对其他的物质具有良好的抗干扰性。在真实样品的检测中，该AA传感器取得了令人满意的结果。
[Abstract]:In this paper, two vanadium substituted polyacids were modified by graphene, gold nanoparticles or tripyridine ruthenium [Ru (bpy) 3] by lamination self-assembly in indium tin oxide glass (ITO), respectively. Two kinds of composite thin films were prepared on quartz and silicon wafer: {PEI/ [P2W16V2-Au/PDDA-rGO] 8/P2W16V2} and {PEI/ [PMo9V3/Ru (bpy) 3/PSS/PDDA-rGO] 5/PMo9V3}. The growth of the films was monitored by UV-vis absorption spectroscopy (UV-vis). The results show that the two kinds of composite films grow uniformly and steadily. The surface morphology and roughness of the composite films were characterized by atomic force microscope (AFM) and scanning electron microscope (SEM). The results showed that the surface of the films was micropleated and the nanoparticles were uniformly dispersed on them. The composition of the composite films was studied by X-ray photoelectron spectroscopy (XPS). The results showed that polyacid, graphene, gold nanoparticles or [Ru (bpy) 3] were successfully deposited on the films. The electrochemical properties of the composite films and the sensing properties of uric acid (UA) or ascorbic acid (AA) were studied by amperometric chronograph and cyclic Voltammetric method (CV). The results of electrochemical experiments show that the composite membrane {PEI/ [P2W16V2-Au/PDDA-rGO] 8/P2W16V2} has good electrochemical activity against UA under the physiological conditions of pH=7, the catalytic potential is 0.43V, and the catalytic current has a good linear relationship with the concentration of UA. The detection range is 2.5 脳 10 鈮
本文编号：2483014
[Abstract]:In this paper, two vanadium substituted polyacids were modified by graphene, gold nanoparticles or tripyridine ruthenium [Ru (bpy) 3] by lamination self-assembly in indium tin oxide glass (ITO), respectively. Two kinds of composite thin films were prepared on quartz and silicon wafer: {PEI/ [P2W16V2-Au/PDDA-rGO] 8/P2W16V2} and {PEI/ [PMo9V3/Ru (bpy) 3/PSS/PDDA-rGO] 5/PMo9V3}. The growth of the films was monitored by UV-vis absorption spectroscopy (UV-vis). The results show that the two kinds of composite films grow uniformly and steadily. The surface morphology and roughness of the composite films were characterized by atomic force microscope (AFM) and scanning electron microscope (SEM). The results showed that the surface of the films was micropleated and the nanoparticles were uniformly dispersed on them. The composition of the composite films was studied by X-ray photoelectron spectroscopy (XPS). The results showed that polyacid, graphene, gold nanoparticles or [Ru (bpy) 3] were successfully deposited on the films. The electrochemical properties of the composite films and the sensing properties of uric acid (UA) or ascorbic acid (AA) were studied by amperometric chronograph and cyclic Voltammetric method (CV). The results of electrochemical experiments show that the composite membrane {PEI/ [P2W16V2-Au/PDDA-rGO] 8/P2W16V2} has good electrochemical activity against UA under the physiological conditions of pH=7, the catalytic potential is 0.43V, and the catalytic current has a good linear relationship with the concentration of UA. The detection range is 2.5 脳 10 鈮
本文编号：2483014
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