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This work proposes the combination of a cotton-based sensor with a portable, low-power, low-noise impedance meter based on AD5933 for acetone detection. This compound has been selected as a volatile probe in human breath. Carbon nanotubes act as a sensing layer, modifying their electrical properties after interaction with the target analyte. The AD5933-based impedance meter is included in a customized PCB for data acquisition and communication with a PC. Measurements performed in both dry and wet operating conditions agree with those made using a commercial laboratory-scale impedance meter as a reference. Results highlight impedance decrease, lowering the acetone concentration.

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AD5933-Based Circuit as a Low-Power, Low-Noise Impedance Meter for Acetone Detection Through a CNT-Based Cotton Sensor

  • 会议论文

  • 发表日期：

    2026年

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  • Carmine Villani Delle Vergini,
  • Silvia Casalinuovo,
  • Daniela Caschera,
  • Simone Quaranta,
  • Nicola Lovecchio,
  • Pisana Placidi,
  • Domenico Caputo

摘要

This work proposes the combination of a cotton-based sensor with a portable, low-power, low-noise impedance meter based on AD5933 for acetone detection. This compound has been selected as a volatile probe in human breath. Carbon nanotubes act as a sensing layer, modifying their electrical properties after interaction with the target analyte. The AD5933-based impedance meter is included in a customized PCB for data acquisition and communication with a PC. Measurements performed in both dry and wet operating conditions agree with those made using a commercial laboratory-scale impedance meter as a reference. Results highlight impedance decrease, lowering the acetone concentration.