# A Perspective on Lanthanide-Containing Nanocomposite Hydrogels: Current Research and Future Directions

## TL;DR

This paper reviews lanthanide-based nanocomposite hydrogels and their potential in sensing, biomedicine, and security, while highlighting future research needs.

## Contribution

The paper systematically categorizes recent advancements into five material approaches and outlines future directions.

## Key findings

- Lanthanide-containing nanocomposite hydrogels are tailored using five material-centric approaches.
- Recent developments in composition and interfacial chemistry are summarized.
- Current challenges and future research directions are evaluated for these hydrogel systems.

## Abstract

Lanthanide-containing nanocomposite hydrogels represent
a versatile
class of functional materials with significant potential for applications
in chemical sensing, biomedicine, and information security. Diverse
chemical strategies and design methodologies have been employed to
tailor their structure–property–function relationships.
In this perspective, we provide an overview of recent advancements
in lanthanide-containing nanocomposite hydrogels, systematically categorized
into five material-centric approaches, including upconversion nanoparticles,
metal–organic frameworks, nanoclays, hydroxyapatite, and carbon-based
nanomaterials. We summarize key developments in their composition,
interfacial chemistry, and applications while also evaluating current
challenges and outlining future research directions to guide the continued
evolution of these hydrogel systems.