In situ chemically polymerised polyaniline nanolayer: characterisation and sensing materials

Figures & data

Figure 1. PANi thin film growth modes on glass plate emerged in reaction solution: (0.10M ANi, 0.12 APS, 1.0M HCl; (a) 15 min (mechanical agitation) (b) 15 min (no agitation), (c) 30 min (no agitation)).

Figure 2. 2D topography, microroughness and the height of PANi thin film made by in situ chemical polymerisation. (a) 15 min (mechanical agitation) (b) 15 min (no agitation), (c) 30 min (no agitation).

Figure 3. AFM images of PANi thin film growth on glass (a) 15 min (mechanical agitation) (b) 15 min (no agitation), (c) 30 min (no agitation).

Figure 4. Raman spectrum of PANi thin film growth on glass. (a) 15 min (mechanical agitation) (b) 15 min (no agitation), (c) 30 min (no agitation).

Table 1. Raman assignments of PANi.

Frequencies (cm^−1)	Assignments
1160–1180	C–H bending
1230–1255	C–N stretching
1317–1338	C–N^+ stretching
1470–1490	C=N stretching
1515–1520	N–H bending
1580	C=C stretching
1600–1620	C–C stretching

Table 2. Pristine resistance, air and NH₃ gas sensitivity of PANi layers: (a) 15 min (mechanical agitation), (b) 15 min (no agitation) and (c) 30 min (no agitation).

Sample	Pristine R 0 (kΩ)	Sensitivity (air) (%)	Sensitivity (150 ppm NH3) (%)
a	460	24	210
b	840	40	360
c	200	11	85

Figure 5. Resistance of PANi sample (15 min no agitation) as a function of air pressure (P: pump on, O: open).

Figure 6. Sensitivity profile of PANi sample (15 min no agitation) as a function of NH₃ concentration.