Graphene oxide and DNA aptamer based sub-nanomolar potassium detecting optical nanosensor

Area of Science:

• Nanotechnology
• Biochemistry
• Materials Science

Background:

• Quantum-dot (QD) nanosensors are vital for detecting molecules and ions.
• Graphene oxide (GO) has demonstrated potential in drug delivery and sensing applications.

Purpose of the Study:

• To develop a novel nanosensor system for potassium ion detection.
• To investigate the functionality of QD-aptamer nanosensors when integrated with graphene oxide.

Main Methods:

• A sensor complex comprising DNA aptamer, gold nanoparticle, and semiconductor QD was synthesized.
• The complex was attached to a graphene oxide (GO) flake.
• Optical detection methods were employed to analyze potassium ion concentration.

Main Results:

• The QD-aptamer-quencher nanosensor functions effectively when attached to GO.
• The sensor demonstrates a linear quenching efficiency with the logarithm of potassium concentration from 1 pM to 100 nM.
• A minimum detection limit of 1.96 pM for potassium ions was achieved.

Conclusions:

• The developed nanosensor system is simple, sensitive, and suitable for potassium ion detection.
• Integrating nanosensors with GO enables simultaneous sensing and other applications like drug delivery.
• This platform holds promise for in-vitro detection of physiological ions, pathogens, and diseases.