Amperometric sensing of hydrogen peroxide on a modified electrode with layered Au/TiO2 nanofilms from self-assembly at air/water interface

•GC electrodes were modified with layered nanofilms of Au and TiO2 nanoparticles.•The both nanofilms were obtained by self-assembly at air/water interface.•The layered nanofilms of Au and TiO2 nanoparticles were mesoporous.•The synergetic effect between TiO2 and Au enhanced the electrocatalytic activity.•The modified film demonstrated good performance in sensing of H2O2.

An electrochemical sensor was fabricated based on a modified glassy carbon (GC) electrode with layered Au/TiO2 nanofilms for sensing of hydrogen peroxide. Both nanofilms of Au and TiO2 nanoparticles were obtained by self-assembly at air/water interface and were successively transferred onto the GC surface layer by layer. The mesoporous structure of the layered films and the synergistic effect between Au and TiO2 nanoparticles enhanced the electrocatalytic activity towards oxidation of H2O2. Under optimized conditions, the modified electrode demonstrated good performances in detection of H2O2. The linear range, detection limit and sensitivity for H2O2 sensing were 1 μM–7 mM, 0.1 μM (S/N = 3) and 664.3 μA mM−1 cm−2, respectively.

Graphical abstractThe mesoporous TiO2/Au/GC electrode obtained by modifying the GC electrode with layered nanofilms of Au and TiO2 nanoparticles from self-assembly at gas–liquid interface exhibited enhanced electrocatalytic activity and sensing performance towards H2O2.Figure optionsDownload full-size imageDownload as PowerPoint slide