Fabrication of CoTiO3-TiO2 composite films from a heterobimetallic single source precursor for electrochemical sensing of dopamine.
Fabrication of CoTiO3-TiO2 composite films from a heterobimetallic single source precursor for electrochemical sensing of dopamine.
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DOI：
10.1039/c6dt01016d
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发表时间：
2016-06
影响因子：
4
通讯作者：
M. Ehsan;R. Naeem;Hamid Khaledi;M. Sohail;Abbas Hakeem Saeed;M. Mazhar
中科院分区：
文献类型：
--
作者：
M. Ehsan;R. Naeem;Hamid Khaledi;M. Sohail;Abbas Hakeem Saeed;M. Mazhar
采用单源异金属配合物[Co2Ti4(μ-O)6(TFA)8(THF)6]·THF()，在fto镀膜玻璃基底上生长钛酸钴复合氧化物薄膜。该配合物是由四氢呋喃溶液中的四水合二乙酰钴（ii）、四异丙氧基钛（iv）和三氟乙酸反应定量得到的。对配合物进行了熔点、红外光谱、热重和单晶x射线衍射等理化分析。采用气溶胶辅助化学气相沉积的方法，在500、550和600℃的不同温度下，制备了不同尺寸的球形CoTiO3-TiO2薄膜。利用XRD、拉曼光谱、x射线光电子能谱、扫描电镜、能量色散x射线分析等手段对多巴胺（DA）的电化学检测进行了探索。CoTiO3-TiO2电极循环伏安法在+0.215 V处检测到DA氧化峰，线性扫描伏安法检测限为0.083 μM，线性浓度范围为20 ~ 300 μM。因此，CoTiO3-TiO2电极是一种敏感和选择性检测DA的潜在候选电极。
Cobalt titanate-titania composite oxide films have been grown on FTO-coated glass substrates using a single-source heterometallic complex [Co2Ti4(μ-O)6(TFA)8(THF)6]·THF () which was obtained in quantitative yield from the reaction of diacetatocobalt(ii) tetrahydrate, tetraisopropoxytitanium(iv), and trifluoroacetic acid from a tetrahydrofuran solution. Physicochemical investigations of complex have been carried out by melting point, FT-IR, thermogravimetric and single-crystal X-ray diffraction analyses. CoTiO3-TiO2 films composed of spherical objects of various sizes have been grown from by aerosol-assisted chemical vapor deposition at different temperatures of 500, 550 and 600 °C. Thin films characterized by XRD, Raman and X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis have been explored for electrochemical detection of dopamine (DA). The cyclic voltammetry with the CoTiO3-TiO2 electrode showed a DA oxidation peak at +0.215 V while linear sweep voltammetry displayed a detection limit (LoD) of 0.083 μM and a linear concentration range of 20-300 μM for DA. Thus, the CoTiO3-TiO2 electrode is a potential candidate for the sensitive and selective detection of DA.