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To prepare sample S1, 26.3 mg of DEA were
dissolved into 50 mL of distilled water to obtain a 5.0 mM DEA
solution, and 37.2 mg of zinc nitrate hexahydrate were dissolved into
50 mL of distilled water to form a 2.5 mM zinc nitrate solution; the
above two solutions and 0.35 mmol of OA were added into a reactor
together. After the mixture stirred at room temperature for 30 min and
the temperature was increased to 80 ¡ãC with continuous stirring for
another 2.0 h, stable ZnO nanoparticles are formed in the solution.
The as-prepared dispersion was filtered, and then the dispersion was
centrifuged and as-obtained product was redispersed subsequently with
1-butanol, 1-propanol, and ethanol to remove any unreacted molecules.
Finally, the QDs were obtained by centrifugation and then dispersed
in water for further characterization.
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