Spontaneous grafting: A novel approach to graft diazonium cations on gold nanoparticles in aqueous medium and their self-assembly on electrodes

The convenient preparation of stable aryl-coated zerovalent iron nanoparticles

“…These unstable diazotate species are able to spontaneously generate radicals [18], which react with the surface of the ZVI NPs resulting in highly stable, covalent linkages. Since the first demonstration in 1990, the formation of multilayer films on different surfaces (carbon, gold, iron) has been confirmed several times through the generated radicals from ADSs [32–34]. Since the 4-position group is an electron acceptor, the ortho positions to the substituents are chemically activated and the free radicals can perform a nucleophilic attack.…”

Functionalization of nanomaterials with aryldiazonium salts

“…28 In a similar procedure, Kesavan and John prepared aminotriazole grafted gold nanoparticles by spontaneous reaction between gold NPs and aminotriazole diazonium cations prior to their deposition on glassy carbon electrodes for the electroanalysis of theophylline and uric acid [161]. In another study by the same group, they attached aminophenyl groups to gold NPs prior to their selfassembly onto GC or ITO electrode surfaces [162]. However, instead of using isolated aryldiazonium salts, they were generated in the presence of gold NPs.…”

“…However, instead of using isolated aryldiazonium salts, they were generated in the presence of gold NPs. The modified electrode showed improved electrocatalytic activity over bare GC towards the oxidation of dopamine [162] or purine derivative [163]. Interestingly, the authors claimed 6-month stability of the aminopehnyl-capped gold NPs obtained via in situ generated diazonium salts over the method using isolated diazonium salts.…”

“…One additional advantage of this approach was claimed concerning the colloidal stability of aryl-capped gold NPs [162]. Authors of this A C C E P T E D M A N U S C R I P T…”

The convenient preparation of stable aryl-coated zerovalent iron nanoparticles

“…These unstable diazotate species are able to spontaneously generate radicals [18], which react with the surface of the ZVI NPs resulting in highly stable, covalent linkages. Since the first demonstration in 1990, the formation of multilayer films on different surfaces (carbon, gold, iron) has been confirmed several times through the generated radicals from ADSs [32][33][34]. Since the 4-position group is an electron acceptor, the ortho positions to the substituents are chemically activated and the free radicals can perform a nucleophilic attack.…”