Table 1.
Summary of different types of paper substrates and their characteristics.
| Type of Paper Substrate | Sensing Material | Fabrication Method | RH Range (%) | Sensitivity | Reference |
|---|---|---|---|---|---|
| Filter paper (Whatman 4) | Carbon black (CB) and Reduced graphene oxide (rGO) |
Coating and drying | 33–95% | 0.7 (33−75%) 1.5 (75−95%) |
[13] |
| Printing paper | Polyimide | Laser writing | 0–90% | - | [14] |
| Cellulose filter paper | Cobalt chloride | Soaking and drying | 11–98% | - | [15] |
| A4 printing paper | A4 printing paper | Facile pasting | 7.2–91% | - | [16] |
| A4 porous paper (metallic pearl) |
Graphite and silver nanoparticles |
Screen printing and pencil drawing technique |
70–95% | 0.0564% | [17] |
| Printing paper | Glycidyl trimethyl Ammonium chloride (EPTAC) |
Screen printing | 11–95% | 1.59 (54 RH%) 63.7 (95 RH%) |
[15] |
| Metalized paper (aluminum-coated paper) | Polymeric layer | Laser ablation | 2–85% | 18.9 fF/%RH | [16] |
| Cellulose paper | Carbon nanotube and Polydimethy siloxane composite |
Screen printing | 30–95% | 0.375 pF/RH% (30–70%) 8.24 pF/RH% (70–95%) |
[17] |
| Glossy paper | Graphene printing ink | Inkjet printing | 40–70% | 0.03 pF/RH% | [18] |