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. Author manuscript; available in PMC: 2013 Sep 2.

Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2012 Sep 2;116(5):3845–3850. doi: 10.1021/jp210582t

(a) PCA plot (PC1 vs. PC2) of scores using 7 sensors (bare SWNT, SWNTs-OEP, SWNTs-RuOEP, SWNTs-FeOEP, SWNTs-TPP, SWNTs-RuTPP, and SWNTs-FeTPP) and (b) PCA plot (PC2 vs. PC3) of 7 sensors showing well separated clusters for 5 VOCs under test (MeOH, EtOH, MEK and acetone).

(a) PCA plot (PC1 vs. PC2) of scores using 7 sensors (bare SWNT, SWNTs-OEP, SWNTs-RuOEP, SWNTs-FeOEP, SWNTs-TPP, SWNTs-RuTPP, and SWNTs-FeTPP) and (b) PCA plot (PC2 vs. PC3) of 7 sensors showing well separated clusters for 5 VOCs under test (MeOH, EtOH, MEK and acetone).