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Nitrogen-polar gallium nitride substrates as solid-state pH-selective potentiometric sensors.
- Source :
-
Applied Physics Letters . 10/5/2009, Vol. 95 Issue 14, p142501. 3p. 1 Diagram, 2 Graphs. - Publication Year :
- 2009
-
Abstract
- This paper reports pH-selective potentiometric responses of epitaxial nitrogen-polar (0001) GaN films on sapphire substrates. The potential of a nitrogen-polar GaN substrate increased with decreasing solution pH from 10 to 2 in a Nernstian manner, whereas it did not significantly change upon increasing the concentrations of the cationic and anionic interfering species. In particular, the negligible responses to anions marked a sharp contrast with previously reported results on gallium-polar GaN that exhibited Nernstian responses to anions. The potentiometric response to pH probably originates from the adsorption of H+ onto oxide-coated nitrogen-polar GaN substrates having polarization-induced negative surface charge. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 95
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 44539762
- Full Text :
- https://doi.org/10.1063/1.3242356