二氧化钛纳米管阵列复合材料的制备及电化学传感性能研究化学工程与技术专业论文.docxVIP

AbstractHighly Abstract Highly sensitive and selective electrochemical sensors have been intensively studied recently．The emerging nanomaterials and nanotechnologies have paved the way for the development of high performance electrochemical sensors．Electrochemically anodized titanium dioxide nanotube arrays(Ti02 NTAs)possess uniform nanostructure， high specific surface area，good chemical stability and excellent biocompatibility．This nanomaterial has been demonstrated the ideal substrate to develop nanostructured electrochemical sensors．Herein，we reported a high performance electrochemical sensor by coating a carbon layer on Ti02 NTAs to form a core·-shell Ti02--C nanotube arrays (Ti02@C NTAs)．The Ti02@C NTAs were futher decorated with copper and nickel nanoparticles to develop glucose sensors．The main contributions of this dissertation are summerized as follows： (1)Uniform Ti02 NTAs were fabricated by electrochemical anodization,with tube diameters of-80珈n，lengths ranging from 3 to 5pxn．A carbon layer Was coated on Ti02 NTAs by hydrothermal treatment of Ti02 NTAs in glucose solution，followed by annealing in a tube furnace under argon flow．The Ti02@C NTAs electrode exhibits a reversible voltammetric response to{Fe(CN)6}3-／4-redox couple and call be applied to the determination of some small biological molecules such as dopamine(DA)，ascorbic acid(AA)and uric acid(UA)．Selective detection of DA Was demonstrated with coexistence of AA and UA，exhibiting a linear range of 1-1 00¨M by differential pulse voltammetry． (2)Copper nanoparticles decorated Ti02@C NTAs(Cu NPs／Ti02@C NTAs)were prepared by hydrothermal treatment of Ti02@C NTAs in Cu(N03)2 solution．Cu NPs were uniformly dispersed in the nanotubes of Ti02@C NTAs．The Cu NPs／Ti02@C NTAs sensor Was employed for the determination of glucose，with a sensitivity of 1 1 57 衅‘mM小cm-2，a linear range of 1-2467¨M，a detection limit of 0．17 IxM(S／N=3)，a good reproducibility with a relative standard deviation(RSD)of 3．3％(n_1 O)and II