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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhanced sensitivity of scanning bipolar electrochemical microscopy for O-2 detection

Full text
Author(s):
Santos, Carla Santana [1, 2] ; Conzuelo, Felipe [1] ; Essmann, Vera [1] ; Bertotti, Mauro [2] ; Schuhmann, Wolfgang [1]
Total Authors: 5
Affiliation:
[1] Ruhr Univ Bochum, Fac Chem & Biochem, Analyt Chem Ctr Electrochem Sci CES, Univ Str 150, D-44780 Bochum - Germany
[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes 748, BR-05513970 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Analytica Chimica Acta; v. 1087, p. 36-43, DEC 9 2019.
Web of Science Citations: 0
Abstract

The Scanning Bipolar Electrochemical Microscope (SBECM) allows precise positioning of an electrochemical micro-probe serving as bipolar electrode that can be wirelessly interrogated by coupling the electrochemical detection reaction with an electrochemiluminescent reporting process. As a result, the spatially heterogeneous concentrations of an analyte of interest can be converted in real time into a map of sample reactivity. However, this can only be achieved upon optimization of the analytical performance ensuring adequate sensitivity. Here, we present the evaluation and optimized operation of the SBECM for the detection of small changes in local O-2 concentrations. Parameters for achieving an improved sensitivity as well as possibilities for improving the signal-to-noise ratio in the optical signal readout are evaluated. The capability of the SBECM for O-2 detection is shown at controlled conditions by recording the topography of a patterned sample and monitoring O-2 evolution from a photoelectrocatalyst material. (C) 2019 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 17/12629-1 - Use of multi bipolar electrodes as sensors to monitor cell activity
Grantee:Carla Santana Santos
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 14/22396-6 - Development of a microsensor coupled to scanning electrochemical microscopy to investigate the role of mitochondria on the respiration process
Grantee:Carla Santana Santos
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)