Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Sự tích hợp của CNT với các hệ thống sinh học để hình thành các cụm chức năng là một lĩnh vực mới và ít được khám phá của research.65a, 174 CNT đã được nghiên cứu như các nhà khai thác tiềm năng vận chuyển và cung cấp các thành phần hoạt tính sinh học khác nhau vào cells.65 Sự kết hợp của các tính chất tiến hành của CNT và các thuộc tính nhận dạng của các vật liệu sinh học có thể cung cấp cho hệ thống mới bioelectronic (ví dụ như cảm biến sinh học) | Chemistry of Carbon Nanotubes Chemical Reviews 2006 Vol. 106 No. 3 1115 Au surface Figure 18. Controlled deposition of oxidized nanotubes onto gold surfaces by using aminothiols as chemical tethers. soluble CNT could be linked with gold nanoparticles by using a thiol-pyrene derivative as the cross-linker.163d Being a bifunctional molecule the cross-linker can be bound to the surface of the CNT by n n stacking while at the same time the thiol groups can react covalently with the gold nanoparticles. The nanotube metal interaction was studied by fluorescence and Raman spectroscopies. The groups of Castano164 and Shaffer165 independently described a method of silylating oxidized MWNT by reacting the carboxylic acids with the appropriate silanes. Similar to the acylation esterification approach the carboxylic groups of oxidized nanotubes were converted to carboxylate salts by treatment with a base.166 Subsequently the carboxylates reacted with alkyl halides in the presence of a phase transfer agent to give alkyl-modified nanotubes. The solubility of the adducts was found to be a function of the chain length of the alkyl group. Intermolecular junctions between CNT were reported by coupling oxidized material with the appropriate linkers.167a b Acyl chloride-terminated nanotubes reacted with aliphatic diamines and the resulting adduct was characterized by Raman spectroscopy. Such amino-functionalized tubes are perfect scaffolds for the covalent binding of polymers and biomolecules.167c The issue of the controlled deposition and alignment of CNT on different types of surfaces has been studied extensively in the last few years. In principle by attaching acidic moieties to the graphitic surface one can guide the assembly on any substrate. Important progress concerning the controlled deposition of CNT on gold surfaces was achieved by the thiolization reaction of carboxyl-terminated CNT.138 168 169 Short-length oxidized CNT were treated with the appropriate thiol derivative and
