Polymer encapsulation via initiated chemical vapor deposition (iCVD) to enhance stability of Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> MXene-based formaldehyde sensors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40644554.
- Also identified by DOI 10.1126/sciadv.adu6682 and PMC identifier 12248370.
- Licence recorded as CC BY-NC.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
MXene is a class of compounds known for its superior electrical properties and versatile surface chemistries. However, its susceptibility to oxidation-induced degradation under ambient conditions prevents its incorporation into devices. In this work, we enhance the stability of MXene-based devices through encapsulation. We developed a sensor based on a heterojunction of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene and silver nanoparticles for formaldehyde detection. This sensor is then encapsulated in poly(1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane) deposited via initiated chemical vapor deposition. Encapsulation substantially improved sensor stability, extending the half life span by more than 200%. These findings were reinforced by molecular dynamic simulations. Furthermore, upon hydration, siloxane in the encapsulant forms silanol which reacts with formaldehyde and boosts sensitivity by 1.7 times. We also demonstrate a rapid, low-energy regeneration process that enables the sensor to attain up to 90% of its previous response after degradation. These enhancements position this sensor as a reliable solution for real-time formaldehyde detection, in applications ranging from indoor air quality monitoring to industrial safety.