Photoluminescent graphene oxide microarray for multiplex heavy metal ion analysis

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Heavy metal contamination poses significant environmental and health risks.
• Sensitive and selective detection methods are crucial for monitoring pollutants.
• Graphene oxide (GO) offers unique optical and electronic properties for sensing applications.

Purpose of the Study:

• To develop a multiplex aptamer-linked graphene oxide (GO) microarray for simultaneous detection of heavy metal ions.
• To investigate the fluorescence quenching mechanism upon heavy metal ion binding.
• To establish a sensitive and selective platform for environmental monitoring.

Main Methods:

• Synthesis of fluorescent nanosized GO sheets.
• Micropatterning of GO sheets to create an array.
• Immobilization of specific aptamers targeting Ag(+) and Hg(2+).
• Detection of heavy metal ions via fluorescence quenching assay.

Main Results:

• Successful fabrication of an aptamer-GO microarray.
• Demonstrated selective capture and detection of Ag(+) and Hg(2+) ions.
• Observed fluorescence quenching of GO upon binding with target heavy metal ions, indicating electron transfer.

Conclusions:

• The aptamer-linked GO microarray is an effective platform for multiplex heavy metal ion detection.
• The fluorescence quenching mechanism provides a sensitive signal for quantitative analysis.
• This technology holds promise for environmental monitoring and water quality assessment.