Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids

Title	Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids
Authors	Ghulam Hussain, Anthony P. O'Mullane, Debbie S. Silvester
Magazine	Nanomaterials
Date	09/17/2018
DOI	10.3390/nano8090735
Introduction	Electrochemical gas sensors are essential for detecting redox-active gases in the atmosphere. However, microelectrodes often suffer from reduced electroactive surface areas, leading to low current responses for low gas concentrations. To address this, microarray thin-film electrodes (MATFEs) were enhanced by depositing platinum into recessed holes, forming high surface area 3D dendritic structures. This was achieved using lead acetate (Pb(OAc)2) in the plating solution. One-step and two-step deposition processes were tested, with total times of 300 s and 420 s, respectively. The modified MATFEs demonstrated significantly increased currents for oxygen reduction, achieving 9 to 16 times the current of unmodified electrodes. The highest sensitivity was observed with a two-step deposition totaling 420 s, both steps utilising Pb(OAc)2. This study illustrates that commercially available microelectrodes can be effectively enhanced for improved analytical performance.
Quote	Ghulam AKM Hussain, Anthony P. O'Mullane and Debbie S Silvester. Modification of Microelectrode Arrays with High Surface Area Dendritic Platinum 3D Structures: Enhanced Sensitivity for Oxygen Detection in Ionic Liquids. Nanomaterials. 2018. DOI: 10.3390/nano8090735
Element	Platinum (Pt) , Oxygen (O)
Topics	Deposition Processes
Industry	Research & Laboratory