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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 17.

Figure 17.

Detection of NO2 using polymer-coated SWCNTs. (a) Optical image of devices after coatings of polymer solutions. (b) SEM micrograph of SWCNTs bridging the electrodes. (c) Relative change in conductance of a polyethyleneimine-(PEI) coated SWCNT sensor when exposed to various concentration of NO2. The recovery of the sensors was facilitated by UV illumination. (d) Comparison between Nafion- and PEI-coated SWCNTs. Nafion-coated devices (top, red) responded to NH3, but not to NO2; while, PEI-coated devices only responded to NO2. Reproduced with permission from Ref. 345. Copyright 2003, American Chemical Society.