Transilient Response to Acetone Gas Using the Interlocking p+n Field-Effect Transistor Circuit

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Acetone in exhaled breath is a key indicator for diabetes diagnosis.
• Detecting low acetone concentrations (1.8-10 ppm) is crucial for accurate diabetes screening.

Purpose of the Study:

• To develop a highly sensitive and selective sensor for low-concentration acetone gas detection.
• To utilize manganese-doped zinc oxide nanoparticles (MZO) within an interlocking p+n field-effect transistor (FET) circuit for enhanced acetone sensing.

Main Methods:

• Fabrication of an interlocking p+n FET circuit incorporating MZO nanoparticles.
• Testing the sensor's response to varying acetone concentrations, including low levels near 1.8 ppm.
• Evaluating sensor performance under different humidity conditions and selectivity against other volatile organic compounds.

Main Results:

• The MZO-based interlocking circuit exhibited a significant response jump (1233%) to acetone concentrations between 1 ppm and 2 ppm.
• The sensor demonstrated low voltage signals (<0.3 V) for acetone <2 ppm and high signals (>4.0 V) for acetone >2 ppm.
• The sensor showed high selectivity for acetone over formaldehyde, acetaldehyde, toluene, and ethanol, with minimal interference from 85% relative humidity.

Conclusions:

• The proposed MZO-based interlocking circuit offers a promising technology for the widespread qualitative screening of diabetes.
• The interlocking circuit design enhances sensitivity and selectivity for acetone detection, applicable to other metal oxide semiconductor gas sensors.