Methanol sensor efficiency under N₂ base gas of the graphene-based materials, dPIn, and their composites^a.

Material	Relative conductivity response	Response time (min)	Recovery time (min)	Reversibility
cm-G	(7.90 ± 3.58) × 10−3	11.67 ± 1.17	—	Irrecoverable
cm-GO	3.79 ± 0.3	16.15 ± 3.03	12.81 ± 3.43	Fully recoverable
C-rGO	−0.10 ± 0.03	21.67 ± 4.50	—	Partly recoverable
T-rGO	−0.48 ± 0.12	15.14 ± 0.31	—	Partly recoverable
OIHM-GO	1.53 ± 0.02	16.25 ± 3.78	1.29 ± 0.51	Fully recoverable
dPIn38	57.83 ± 5.03	25.93 ± 1.44	18.88 ± 0.27	Fully recoverable
In situ 10% v/v cm-G/dPIn	0.71 ± 0.13	59.48 ± 7.26	4.52 ± 0.65	Fully recoverable
In situ 10% v/v C-rGO/dPIn	27.37 ± 2.22	54.84 ± 1.51	17.49 ± 1.01	Fully recoverable
In situ 10% v/v T-rGO/dPIn	20.03 ± 3.78	44.76 ± 2.31	19.83 ± 1.31	Fully recoverable
In situ 10% v/v cm-GO/dPIn	95.76 ± 3.77	54.03 ± 1.08	17.68 ± 0.82	Fully recoverable
SM 10% v/v cm-GO/dPIn	19.98 ± 1.63	78.23 ± 5.08	8.29 ± 1.78	Fully recoverable
In situ 10% v/v OIHM-GO/dPIn	81.89 ± 2.12	28.08 ± 1.93	19.91 ± 3.50	Fully recoverable

^aRemarks: (1) methanol concentration was constant at 11.36 ppm, 1.1 atm pressure, and 20 ± 3% RH. (2) Doping of PIn and composites was fixed at a 10 : 1 doping mole ratio of HClO₄/indole. (3) In situ means the graphene-based materials/PIn composites were prepared by in situ polymerization. (4) SM means the graphene-based material/PIn composite was prepared by simple mixing.