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Capillary Melt Method for Micro Antimony Oxide pH Electrode
Author(s) -
Ha Yang,
Wang Min
Publication year - 2006
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.200603517
Subject(s) - antimony , electrode , materials science , antimony oxide , reproducibility , oxide , analytical chemistry (journal) , capillary action , capillary electrophoresis , inorganic chemistry , chemistry , composite material , chromatography , metallurgy
In this work, a new approach named “capillary melt method” was developed to fabricate micro antimony wires, and the wire surface was then oxidized in a nitrate melt at high temperature to obtain an antimony/antimony oxide pH electrode. Characterization results show that the oxide layer on the wire surface is porous, and consists of Sb 2 O 3 crystal phase. The pH electrode, made using this method, showed good sensing performance in buffer solutions in the tested pH range of 2–12. Its EMF signal was found to have a linear relationship with pH value of the solution, with a sensitivity of 54.1 mV/pH and a fitting correlation coefficient of R 2 =1.00. The advantages of the electrode are long‐term stability, fast response, reproducibility and low cost.