Ultrasensitive detection of UO₂ ²⁺ based on dopamine-functionalized MoO_x quantum dots

Area of Science:

• Environmental Science
• Materials Science
• Analytical Chemistry

Background:

• Nuclear power growth increases uranium contamination risks from waste.
• Effective control and monitoring of uranium contamination require rapid, sensitive, and portable detection methods.

Purpose of the Study:

• To develop a highly sensitive and selective method for detecting uranium contamination.
• To enhance molybdenum oxide quantum dots (MoO_x QDs) for improved uranium detection capabilities.

Main Methods:

• Functionalization of MoO_x QDs with dopamine (DA) to introduce oxygen- and nitrogen-containing groups.
• Utilizing the strong coordination ability of these groups for uranium binding.
• Testing the sensitivity, selectivity, and detection limit of the DA-MoOx QDs for uranium.

Main Results:

• DA-functionalized MoO_x QDs (DA-MoOx QDs) exhibited a nearly 1000-fold increase in sensitivity compared to unmodified MoO_x QDs.
• Achieved a low limit of detection of 3.85 nM for uranium.
• Demonstrated high selectivity, successfully detecting uranium even in the presence of 100-fold higher concentrations of other metal ions using ethylenediaminetetraacetic acid masking.

Conclusions:

• DA-MoOx QDs provide a highly sensitive and selective platform for uranium detection.
• This method shows significant promise for effective uranium contamination control and environmental monitoring.