X-Ray photoelectron spectroscopy studies of graphite powder and multiwalled carbon nanotubes covalently modified with Fast Black K: evidence for a chemical release mechanism via electrochemical reduction

摘要: The development of new materials from which to construct controlled chemical-release systems has been an active area research for the past four decades. Using X-ray photoelectron spectroscopy (XPS) we demonstrate that graphite powder and multiwalled carbon nanotubes (MWCNTs) covalently derivatised with 2,5-dimethoxy-4-[4-(nitrophenyl)azo]benzenediazonium chloride (FBK) or a derivative FBK are important micro nano-scale use as voltammetrically reagents in applications where small size material is advantageous. By examining N1s O1s regions XPS spectra can identify functionalities within moiety well hydroxyl, quinonyl carboxylic acid functional groups present on surface. Comparison (FBKcarbon) MWCNTs (FBK-MWCNTs) before after electrochemical reduction reveals cleavage azo-linkage occurs upon aqueous solution. voltammetric induces chemical release 1,4-phenylenediamine surface, demonstrating proof concept these novel materials. It envisaged derivatives could be used vivo wide range areas including medical diagnosis targeted drug-delivery vitro such analytical chemistry, sensor technology industrial process monitoring control.