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Related Experiment Video

Updated: Jun 12, 2025

Hybrid Printing for the Fabrication of Smart Sensors
08:35

Hybrid Printing for the Fabrication of Smart Sensors

Published on: January 31, 2019

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Sustainable Fully Inkjet-Printed Humidity Sensor Based on Ionic Liquid and Hydroxypropyl Cellulose.

Mikel Rincón-Iglesias1,2,3, Peter Krebsbach2,3, Daniela M Correia4

  • 1BCMaterials, Basque Center for Materials, Bldg. Martina Casiano, UPV/EHU Science Park Barrio Sarriena s/n, 48940 Leioa, Spain.

ACS Applied Materials & Interfaces
|May 25, 2025
PubMed
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Electrospun Polyurethane-Based Nanofibrous Membranes Functionalized with UiO-66-NH<sub>2</sub> for Water Remediation.

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Resolving Complex Multiscale Structure of Magneto- and Electroactive Polymer Composites With an Ionic Liquid.

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Processing-Structure-Property Relationships in Poly(vinylidene fluoride) Composites Containing Metal Organic Frameworks and Ionic Liquids: A Roadmap for Application-Driven Design.

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Effect of Cation Type on the Isothermal Crystallization of Poly(vinylidene fluoride) Blended in Ionic Liquids with [Eu(tta)<sub>4</sub>]<sup>-</sup> Anion.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026

This study introduces a sustainable, dual-response humidity sensor made using inkjet printing. The sensor offers both electrical and visual detection of humidity, addressing e-waste concerns from Internet of Things devices.

Area of Science:

  • Materials Science
  • Sensor Technology
  • Environmental Science

Background:

  • Growing Internet of Things (IoT) adoption increases global e-waste.
  • There is an urgent need for sustainable sensor technologies to mitigate environmental impact.
  • Existing sensors often lack eco-friendly materials and manufacturing processes.

Purpose of the Study:

  • To develop a fully inkjet-printed, dual-response humidity sensor using sustainable materials.
  • To investigate the performance of a sensor based on hydroxypropyl cellulose (HPC) and an ionic liquid ([Bmim]2[NiCl4]).
  • To explore the potential of this sensor for various environmental and industrial applications.

Main Methods:

  • Inkjet printing of an active layer comprising HPC and [Bmim]2[NiCl4] on silver electrodes.
Keywords:
CelluloseHumidityInkjet PrintingIonic LiquidSensors

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  • Optimization of ink formulation including HPC, ionic liquid, ethylene glycol, water, and Tergitol.
  • Characterization of the sensor's electrical and visual responses to varying relative humidity (RH).

    • Main Results:

    • The optimized sensor (50 wt % IL) showed a proportional electrical response from 30-90% RH with high sensitivity (163), low hysteresis (1.5 RH%), and fast response (0.8 s).
    • A visible color change from colorless to cyan was observed upon dehydration, detectable by the naked eye below 30% RH.
    • HPC and the ionic liquid demonstrated excellent compatibility, forming homogeneous films.

    Conclusions:

    • The developed inkjet-printed dual-response humidity sensor utilizes sustainable materials and low-cost fabrication.
    • This sensor offers both electrical and visual detection capabilities, making it versatile.
    • Potential applications include environmental monitoring, smart agriculture, fire safety, and food quality control.