Electrospun polymer nanofibers coated with metal oxides by liquid phase depositi

2019-10-01 23:21:17

Metal coating surface oxide carboxylic

责任者: Drew, Christopher;Wang, Xianyan;Bruno, Ferdinando F.;Samuelson, Lynne A.;Kumar, Jayant 单位: Center for Advanced Materials, University of Massachusetts Lowell, Lowell, MA 01854, United States 来源出处: Composite Interfaces,2005,11(8-9):711-724 摘要: Polyacrylonitrile fibers were electrospun yielding diameters in the range of 50 to 200 nm. These nanofibers were then immersed in an aqueous coating solution to deposit a continuous film of titanium dioxide on the surface. In order to shorten the coating time and optimize the metal oxide layer thickness, the fibers were surface functionalized by immersion in sodium hydroxide to have carboxylic acid groups. Polyelectrolytes were electrostatically adsorbed to some of the functionalized fiber surface samples prior to metal oxide deposition. The metal oxide nucleation density was compared after three hours for nanofibers with a cationic surface, an anionic surface, a carboxylic acid surface, and an untreated surface. Fibers with the carboxylic acid surface exhibited the highest nucleation density, which led to the shortest coating time. Such polymer-metal oxide nanoscale composite structures are expected to be of great utility in a number of applications, including sensors, photovoltaic cells, and catalytic surfaces. © VSP 2005. 关键词: Polymers;Nanostructured materials;Deposition;Coating techniques;Solutions;Titanium dioxide;Polyelectrolytes;Adsorption;Carboxylic acids;Negative ions;Nucleation;Photovoltaic cells;Catalysts;Electrospinning;Metal oxides;Nanofibers;Aqueous deposition