Table 1 The grade, purity, and supplier of the used chemicals.
Chemical | Grade | Purity | Supplier (Company) |
|---|---|---|---|
Zinc nitrate hexahydrate | Analytical reagent grade | ≥ 99% | Merck, Germany |
Neodymium (III) chloride hexahydrate | Analytical reagent grade | ≥ 99% | Merck, Germany |
Copper nitrate hexahydrate | Analytical reagent grade | ≥ 99% | Merck, Germany |
Ammonia solution (NH₃) | Analytical reagent grade | 25% w/w NH₃ | Merck, Germany |
Absolute ethanol | Absolute (anhydrous) | ≥ 99.8% | Merck, Germany |
Sodium hydroxide (NaOH) | Analytical reagent grade | ≥ 98% | Loba, India |
Deionized water | Analytical grade | Resistivity ≥ 18 MΩ·cm | lab-generated |
