V₂CT_X MXene-based hybrid sensor with high selectivity and ppb-level detection for acetone at room temperature

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• MXenes, a class of 2D layered materials, are gaining attention for their unique properties in gas sensing.
• Developing high-performance, room-temperature sensing materials is crucial for advancing gas detection technology.

Purpose of the Study:

• To develop and evaluate a novel chemiresistive gas sensor based on V₂C/V₂O₅ MXene hybrid materials.
• To investigate the room-temperature acetone sensing performance of the V₂C/V₂O₅ MXene sensor.

Main Methods:

• Synthesis of urchin-like V₂O₅ hybrid materials derived from V₂CT_x MXene.
• Fabrication of a chemiresistive gas sensor using the V₂C/V₂O₅ MXene composite.
• Testing the sensor's response to acetone at room temperature, including selectivity and stability assessments.

Main Results:

• The V₂C/V₂O₅ MXene sensor showed significantly higher response to 15 ppm acetone (11.9%) compared to pristine V₂CT_x MXenes (4.6%).
• The sensor achieved a low detection limit of 250 ppb for acetone at room temperature.
• Demonstrated high selectivity, fast response/recovery, good repeatability, and excellent long-term stability.

Conclusions:

• The V₂C/V₂O₅ MXene composite exhibits excellent room-temperature acetone sensing capabilities.
• Synergistic effects between V₂O₅ and V₂C MXene, along with enhanced charge transport, contribute to the improved sensing performance.
• This novel material holds promise for practical gas sensing applications.