Table 4 Comparative assessment of the proposed paper-based sensor and previously reported sensors.
Sensor characters | Proposed method | Published method 27 | Published method 28 | Published method 29 |
|---|---|---|---|---|
Design state | Paper sensor modified with MWCNT and carbon dots | Coated carbon brush electrode modified with azomethine) | Solid-state electrode modified with carbon nanotube | Paper sensor modified with nano-optodes |
Linearity range, (M) | 1.0 × 10–7–1.0 × 10–1 | 1.0 × 10–6–1.0 × 10–1 | 1.0 × 10–5–3.2 × 10–3 | 5.0 × 10–5–5.0 × 10–3 |
LOD, (M) | 7.5 × 10–8 | 1.90 × 10–6 | 6.3 × 10–7 | 5.0 × 10–5 |
Slope, (mV/decade) | 29.14 | 15.09 | 29 | Colorimetric readout |
pH | 2–9 | 4–8 | Neutral sap | Neutra/tap water conditions |
Response time, (s) | 20 | 8 | < 20 | Immediate (naked-eye detection) |
Special features | High sensitivity, wide linearity | Simple electrode but lower sensitivity | Miniaturized, stable, direct use in real sap | Low-cost, portable, equipment free |
