High performance electrochemical glucose sensor based on three-dimensional MoS₂/graphene aerogel

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional (2D) nanosheets are promising for electrochemical biosensors but suffer from aggregation, limiting conductivity.
• Layered metal sulfides and hydroxides face challenges with sheet aggregation, impacting sensor performance.

Purpose of the Study:

• To develop high-performance glucose biosensors using a novel three-dimensional (3D) aerogel structure.
• To address the sheet aggregation limitations of 2D nanosheets in electrochemical sensing applications.

Main Methods:

• Fabrication of a 3D aerogel composed of interconnected 2D molybdenum disulfide (MoS2) and graphene sheets (MGA).
• Utilized flow-injection amperometric evaluation for glucose biosensor performance assessment.
• Investigated enzyme immobilization on the MGA electrode's large surface area.

Main Results:

• The 3D MGA electrode demonstrated a rapid response time of approximately 4 seconds.
• Achieved a wide linear detection range from 2 to 20 mM with a sensitivity of 3.36 μA/mM.
• Exhibited a low limit of detection of 0.29 mM and negligible interference from common oxidizable species.

Conclusions:

• The 3D MGA structure effectively enhances enzyme immobilization and electrical conductivity for superior glucose biosensing.
• This advanced aerogel material offers a promising platform for developing sensitive, selective, and stable electrochemical biosensors.