Highly Stable CsSnCl₃ Quantum Dots Grown in an Ionic Liquid/Gelatin Composite System through an In Situ Method

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Lead halide perovskite quantum dots (QDs) face scrutiny due to high lead content.
• Tin-based perovskites are promising lead-free alternatives but suffer from poor stability.
• Cesium tin chloride (CsSnCl3) QDs specifically require enhanced environmental resilience.

Purpose of the Study:

• To develop highly stable tin-based perovskite quantum dots (QDs).
• To investigate the protective effects of ionic liquid and gelatin on CsSnCl3 QDs.
• To create a lead-free QD system with enhanced environmental and biological resistance.

Main Methods:

• An in situ method was employed using an ionic liquid ([AMIM]Cl) as a solvent and antioxidant, and gelatin as a multidentate ligand and coating material.
• Gelatin's abundant active groups facilitated QD nucleation and passivation, while its long chains provided environmental isolation.
• The [AMIM]Cl/gelatin-QDs composite was subjected to water and UV light exposure to assess stability.

Main Results:

• The [AMIM]Cl/gelatin-QDs exhibited excellent stability, retaining over 60% fluorescence intensity after 72 hours of simultaneous water and UV exposure.
• Gelatin acted as a protective coating, isolating the CsSnCl3 QDs and preventing environmental degradation.
• The composite system demonstrated inherent mildew resistance, protecting the gelatin matrix from mold erosion.

Conclusions:

• The [AMIM]Cl/gelatin-QDs strategy effectively enhances the stability and durability of tin-based perovskite quantum dots.
• This approach offers a viable pathway for developing robust, lead-free quantum dot materials for various applications.
• The synergistic effect of ionic liquid and gelatin provides comprehensive protection against environmental stressors and biological degradation.