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3D Printed Hydrogel-Based Sensors for Quantifying UV Exposure.

Abraham Samuel Finny1, Cindy Jiang1, Silvana Andreescu1

  • 1Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States.

ACS Applied Materials & Interfaces
|September 2, 2020
PubMed
Summary

Researchers developed 3D-printed, wearable ultraviolet (UV) sensors using a novel hydrogel ink. These inexpensive, color-changing sensors offer a simple way to monitor UV exposure and have broad applications in health and sterilization.

Keywords:
3D printable hydrogelsPhotoactive nanoparticlesUV exposureUV sensors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Excessive ultraviolet (UV) radiation poses significant health risks.
  • Scalable, affordable UV monitoring technology is needed for widespread UV exposure assessment.
  • Current UV sensors often lack the flexibility and affordability for wearable applications.

Purpose of the Study:

  • To develop a novel 3D printing procedure and ink for fabricating robust, flexible, and wearable UV sensors.
  • To create inexpensive and easy-to-use UV sensors for monitoring environmental UV exposure.
  • To explore the potential of these sensors for applications beyond personal UV monitoring.

Main Methods:

  • Developed a color-changing hydrogel ink containing alginate, gelatin, titanium dioxide nanoparticles, and dyes.
  • Utilized three-dimensional (3D) printing to fabricate standalone UV sensor constructs.
  • Optimized ink viscosity and composition for printability and tunable mechanical properties.

Main Results:

  • Successfully fabricated mechanically stable, flexible, and wearable UV sensors via a one-step 3D printing process.
  • The sensors exhibit a visible color change upon UV exposure due to photocatalytic dye degradation initiated by titanium dioxide nanoparticles.
  • The sensors accurately quantify outdoor sun exposure by measuring color decrease, visible to the naked eye.

Conclusions:

  • The novel 3D printing method and hydrogel ink enable the cost-effective, large-scale production of advanced UV sensors.
  • These biodegradable, robust, and wearable sensors offer a promising solution for personal UV monitoring and have potential in UV sterilization applications.
  • The developed ink and printing technology hold potential for fabricating diverse sensing technologies beyond UV detection.