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Drain-current response of the sensors to each cadmium compound.
| Cadmium Compound |
Pristine Graphene | TTHA-Modified Grapheme | Terpyridine- Modified Graphene |
|---|---|---|---|
| Cadmium chloride (CdCl2) |
decrease | decrease | decrease |
| Cadmium sulfate (CdSO4) |
decrease | increase | decrease |
| Cadmium nitrate (Cd(NO3)2) |
increase | increase | increase |
