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Related Experiment Video

Updated: Sep 7, 2025

Hybrid Printing for the Fabrication of Smart Sensors
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Fully Inkjet-Printed Chemiresistive Sensor Array Based on Molecularly Imprinted Sol-Gel Active Materials.

Xiao Ye1, Lingpu Ge2, Tianshu Jiang2

  • 1Graduate School of Systems Life Sciences, Kyushu University, Fukuoka 819-0395, Japan.

ACS Sensors
|June 22, 2022
PubMed
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This study introduces inkjet-printed sensors using ketjen black (KB) and molecularly imprinted sol-gel (MISG) inks for precise volatile organic acid (VOA) detection. The developed sensor array offers high selectivity and robustness for potential wearable applications.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Inkjet printing enables advanced chemiresistive gas sensors.
  • Enhancing cross-selectivity in sensor arrays remains a key challenge.
  • Molecular imprinting offers molecular recognition capabilities.

Purpose of the Study:

  • To develop a fully inkjet-printed chemiresistive sensor array for accurate volatile organic acid (VOA) recognition.
  • To improve the cross-selectivity of sensor arrays using molecularly imprinted sol-gel (MISG) and ketjen black (KB) inks.
  • To evaluate the detection and discrimination performance of the MISG/KB sensor array for VOAs.

Main Methods:

  • Fabrication of a three-layer sensor structure (circuit, conductive, selective layers) via inkjet printing.
Keywords:
consumer inkjet printerinkjet-printed chemiresistive sensor arraylinear discriminant analysismolecularly imprinted sol−gelvolatile organic acid

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  • Preparation of MISG inks using hexanoic acid (HA), heptanoic acid, and octanoic acid as templates.
  • Imprinting MISG inks onto a KB conductive layer on photographic paper.
  • Gas response analysis and linear discriminant analysis (LDA) for VOA discrimination.

    • Main Results:

    • The MISG/KB sensor array demonstrated high sensitivity and selectivity towards specific VOAs.
    • The limit of detection for HA-MISG/KB sensors was 0.018 ppm with an imprinting factor of 7.82.
    • The sensor array achieved high discrimination of VOAs in single and binary mixtures using LDA.
    • The sensor array exhibited excellent robustness, including consistency, durability, bending, and humidity resistance.

    Conclusions:

    • A fully inkjet-printed chemiresistive sensor array with high cross-selectivity for VOAs was successfully developed.
    • The proposed method enables low-cost, scalable, and highly reproducible sensor fabrication.
    • The sensor array shows potential for reliable, commercial, and wearable multi-analyte human body odor analysis.