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. Author manuscript; available in PMC: 2019 Mar 4.
Published in final edited form as: Chem Rev. 2018 Sep 18;119(1):599–663. doi: 10.1021/acs.chemrev.8b00340

Figure 16.

Figure 16.

NH3 sensors based on films of poly(m-aminobenzenesulfonic acid)-functionalized SWCNTs (SWCNT-PABS). (a) Mechanism of the interaction between SWCNT-PABS with NH3 with the arrows indicating the charge transfer direction between SWCNTs and PABS. (b) NIR spectra after baseline correction of SWCNT-PABS recorded before (black, 1), during (blue, 2), and after (red, 3) the exposure to 20 ppm of NH3. (c) Change in the absorbance at 5320 cm–1 (S11 transition) correlates well with the change in resistance (d). Reproduced with permission from Ref. 339. Copyright 2007, American Chemical Society.