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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The effect of oxygen plasma treatment time. (a) Resistance and (b) Raman spectra of OP-G with different treatment time. (c) Sensitivity of OP-G with different treatment time towards different concentrations of NH3.