tailieunhanh - Báo cáo hóa học: "Modification of alumina matrices through chemical etching and electroless deposition of nano-Au array for amperometric sensing"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Modification of alumina matrices through chemical etching and electroless deposition of nano-Au array for amperometric sensing | Nanoscale Res Lett 2007 2 130-134 DOI s11671-007-9043-y NANO EXPRESS Modification of alumina matrices through chemical etching and electroless deposition of nano-Au array for amperometric sensing Arunas Jagminas Julijana Kuzmarskyte Gintaras Valincius Luciana Malferrari Albertas Malinauskas Received 29 December 2006 Accepted 26 January 2007 Published online 2 March 2007 to the authors 2007 Abstract Simple nanoporous alumina matrix modification procedure in which the electrically highly insulating alumina barrier layer at the bottom of the pores is replaced with the conductive layer of the gold beds was described. This modification makes possible the direct electron exchange between the underlying aluminum support and the redox species encapsulated in the alumina pores thus providing the generic platform for the nanoporous alumina sensors biosensors with the direct amperometric signal readout fabrication. Keywords EIS Modification morphology Nanoparticles Porous alumina Introduction Porous anodic oxide films of aluminum anodically grown in the solutions of oxalic and or sulfuric or phosphoric acids have been used for decades as protection and hard coatings or adhesive layers. In recent Electronic supplementary material Supplementary material is available in the online version of this article at doi s11671-007-9043-2 and is accessible for authorized users. A. Jagminas El J. Kuzmarskyte A. Malinauskas Institute of Chemistry Gostauto 9 01108 Vilnius Lithuania e-mail jagmin@ G. Valincius Institute of Biochemistry Mokslininkụ 12 08412 Vilnius Lithuania L. Malferrari Instituto Nacionale di Fisica Nucleare viale Berti-Pichat 6 2 40127 Bologna Italia years these films so-called alumina due to their honeycomb high-ordered and well-predetermined structure showing tube shaped pore array with a center-to-center spacing from few tents to about 550 nm 1 2 and the pore diameter from about 10 to 250 nm 3 are widely used as a host material for fabrication .