Reduction methods of gold on graphene oxide for nitrite sensing

Abstract

Fabrications of gold on graphene oxide modified electrode (Au/GO/SPCE) were performed by constant voltage cyclic voltammetry and sodium borohydride reduction The highest nitrite sensitivity in linear range of 0 01-0 4 mM was obtained when Au/GO/SPCE was prepared at constant voltage -3V (vs Ag/AgCl) for 200s Compared with gold on screen-printed carbon elecctrode (SPCE) and grapheen oxide (GO) the Au/GO/SPCE had the highest oxidation peak current to background current ratio for nitrite detection The sensitivity of nitrite is affected by the gold content on the electrode and the Au(111) grain size Although higher gold content gave higher sensitivity the agglomeration of gold particles must be avoided to obtain smaller Au(111) grain sizes so as to have a larger surface area and a higher sensitivity

Date of Award	2020
Original language	English
Supervisor	Ming-Chang Yang (Supervisor)