Effect of Volatile Organic Compounds Adsorption on 3D-Printed PEGDA:PEDOT for Long-Term Monitoring Devices

Abstract

We report on the preparation and stereolithographic 3D printing of a resin based on the composite between a poly(ethylene glycol) diacrylate (PEGDA) host matrix and a poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) filler, and the related cumulative volatile organic compounds’ (VOCs) adsorbent properties. The control of all the steps for resin preparation and printing through morphological (SEM), structural (Raman spectroscopy) and functional (I/V measurements) characterizations allowed us to obtain conductive 3D objects of complex and reproducible geometry. These systems can interact with chemical vapors in the long term by providing a consistent and detectable variation of their structural and conductive characteristics. The materials and the manufacture protocol here reported thus propose an innovative and versatile technology for VOCs monitoring systems based on cumulative adsorption effects.

Three-Dimensional-Printed Polyethylene Glycol Diacrylate-Polyaniline Composites by In Situ Aniline Photopolymerization: An Innovative Biomaterial for Electrocardiogram Monitoring Systems

“…This versatility of operation has been considering promising by AM methods to develop soft items with complex geometries for applications ranging from chemical sensors to transistors, microelectromechanical systems up to artificial muscles and smart prosthetic devices, both external and internal to the human body. Until now, basically two approaches have been investigated to print photopolymerizable CPs-based inks: (1) the dispersion of the CPs powder in the printing ink 6,20 and (2) the direct monomer curing on the surface of the printed samples. 21 However, both these methods involve several steps and in general suffer from the low CPs processability and the overlapping between the absorption spectra of CPs and photoinitiator.…”

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

“…Among all of the contaminants in air, volatile organic compounds (VOCs) such as acetone, ethanol, and ammonia vapors are the most common and hazardous. Even at very low concentrations these molecules not only pollute the environment, but also directly affect human health and climate change. ,, Commercial gas sensors are based on different transduction mechanisms and materials, which include polymers, − metal oxides, − or nanocomposites. ,,− The most common are the ones based on metal oxide semiconductors, which require high working temperatures to obtain good sensitivities, fast response, and selectivity. ,, Morandi et al fabricated a CH 4 sensor using Pt/Zn/Al-LDH operating at 450 °C . This entails an increase in power consumption and device complexities, and it is unfavorable for device stability and flammable or explosive environments.…”

Additive Manufacturing of Conducting Polymers: Recent Advances, Challenges, and Opportunities

“…They proposed a proof of concept where variations in the structure and conductivity could be used for monitoring hazardous compounds associated with cumulative adsorption effects. 99 …”

“…They proposed a proof of concept where variations in the structure and conductivity could be used for monitoring hazardous compounds associated with cumulative adsorption effects. 99 Regarding PEDOT nanocomposites, as a first example PEDOT:PSS was interpenetrated in situ into nanostructured electrically conductive hydrogels (NECHs) that contained MWCNTs doped with a hydrophilic photoresist, which were ultrafast laser processed as an absorbent 3D scaffold. A twophoton hydrogelation boosted the manufacturing of 3D scaffolds in the nanoscale domain at very high resolution, where the inclusion of PEDOT enhanced the mechanical and electrical properties of 10 −2 S cm −1 .…”

“…Three-dimensional PEGDA:PEDOT structures printed by SLA were also studied by other authors for the long-term monitoring of adsorbed volatile organic compounds. They proposed a proof of concept where variations in the structure and conductivity could be used for monitoring hazardous compounds associated with cumulative adsorption effects …”