Hydrophobic adsorption of surfactants on water-soluble carbon nanotubes: A simple approach to improve sensitivity and antifouling capacity of carbon nanotubes-based electrochemical sensors |
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| Institution: | 1. Department of Chemistry, Wuhan University, Wuhan, Hubei 430072, China;2. Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Enshi 445000, China;1. Departamento de Ingeniería de Procesos e Hidráulica, Mexico;2. Departamento de Química, Universidad Autónoma Metropolitana Unidad Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, C.P. 09340 Ciudad de México, Mexico;3. Centro Mexicano para la Producción más Limpia, Instituto Politécnico Nacional, AvenidaAcueducto s/n, Col. La Laguna Ticomán, Ciudad de México 07340, México;1. Department of Chemical & Biomolecular Engineering, Clemson University, Clemson, SC 29634, United States;2. Department of Physics & Astronomy, COMSET, Clemson University, Clemson, SC 29634, United States;3. Clemson Nanomaterials Center, Clemson University, Clemson, SC 29634, United States;1. School of Pharmacy, Nanjing Medical University, Nanjing 211166, PR China;2. Jiangsu Food and Pharmaceutical Science College, Huai''an 223003, PR China;1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, College of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300016, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Water-soluble multi-walled carbon nanotubes (MWNTs) were prepared by the strong adsorption of Congo red (CR) on MWNTs. The CR-functionalized MWNTs (MWNTs–CR) had a high solubility, a high purity and a special property of strong rebundling when dried, capable of forming uniform and compact MWNTs films with a 3D network structure of nanosizes on a glassy carbon electrode (GCE). Compared with GCE, the electrochemical response of estradiol at a MWNTs–CR modified glassy carbon electrode (MWNTs–CR/GCE) was greatly enhanced, which was further amplified by the addition of trace cetyltrimethylammonium bromide (CTAB) in solution, along with the accomplishment of antifouling capacity of the modified electrode. The weak hydrophobic adsorption of surfactants on the hydrophobic and smooth surface of MWNTs was found to be the key for simultaneously improving the sensitivity and antifouling capacity of carbon nanotube-based electrochemical sensors by surfactants. |
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