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Determination of Temperature Gradients with Micrometric Resolution by Local Open Circuit Potential Measurements at a Scanning Microelectrode
Author(s) -
Sode Aya,
Nebel Michaela,
Pinyou Piyanut,
Schmaderer Sebastian,
Szeponik Jan,
Plumeré Nicolas,
Schuhmann Wolfgang
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300258
Subject(s) - microelectrode , scanning electrochemical microscopy , open circuit voltage , electrolyte , materials science , resolution (logic) , temperature measurement , temperature gradient , calibration , analytical chemistry (journal) , electrode , electrochemistry , chemistry , voltage , chromatography , thermodynamics , physics , statistics , mathematics , quantum mechanics , artificial intelligence , computer science
A method to determine localized temperature profiles using a scanning electrochemical microscopy (SECM) setup and potentiometry is presented. A Pt microelectrode was first calibrated to correlate the open circuit potential (OCP) with temperature in an electrolyte containing ferri/ferrocyanide. Using the calibration graph, the temperature at a given position and a time could be derived. For dynamic measurements, the thermal expansion of the surface was initially determined using shear force mode SECM. Following the OCP at the microelectrode static as well as dynamic temperature gradients above the heated surface were successfully probed and visualized with vertical micrometric resolution and with precision in temperature determination below 1 °C.