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Inkjet-Printed Functionalization of CMUT-Based CO2 Sensors.

Dovydas Barauskas1, Donatas Pelenis1, Mindaugas Dzikaras1

  • 1Panevezys Faculty of Technology and Business, Kaunas University of Technology, 44249 Kaunas, Lithuania.

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Summary

Optimized inkjet-printed polyethyleneimine (PEI) films on capacitive micromachined ultrasound transducers (CMUTs) minimize frequency shifts while preserving CO2 sensor sensitivity. A 200 nm PEI film thickness proved optimal for enhanced CO2 detection.

Keywords:
capacitive micromachined ultrasound transducerscarbon dioxide sensinginkjet printingpolyethyleneiminesilicon micromachiningsurface functionalization

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Capacitive micromachined ultrasound transducers (CMUTs) are promising for gas sensing applications.
  • Optimizing surface functionalization is crucial for balancing sensor sensitivity and signal stability.
  • Polyethyleneimine (PEI) is a suitable material for CO2 functionalization of CMUT surfaces.

Purpose of the Study:

  • To optimize the surface modification process of CMUTs using inkjet-printed PEI films for CO2 sensing.
  • To address the trade-off between functionalization-induced parameter shifts and sensor sensitivity.
  • To achieve high-performance CO2 detection with CMUT-based sensors.

Main Methods:

  • Inkjet printing of polyethyleneimine (PEI) films onto CMUT surfaces.
  • Optimization of PEI solution dilution and CMUT surface preparation.
  • Characterization of CMUT resonance frequency, quality factor, and sensitivity.
  • Testing sensor response to CO2 gas under varying PEI film thicknesses.

Main Results:

  • Minimized functionalization shift in resonance frequency and quality factor.
  • Preserved sensitivity potential of the CMUT-based CO2 sensor.
  • Demonstrated a 23.2 kHz frequency shift for a 16 MHz sensor switching between N2 and CO2.
  • Identified an optimal PEI film thickness of 200 nm for CO2 absorption.
  • Controlled inkjet functionalization resolution down to 150 μm dot diameter.

Conclusions:

  • The optimized PEI functionalization process effectively balances CMUT sensor performance for CO2 detection.
  • A 200 nm PEI film thickness represents the practical limit for CO2 absorption, maximizing sensor performance.
  • Inkjet printing offers precise control over functionalization, enabling tailored CMUT sensor design.