Shell Coating Effects on Upconversion Nanoparticles Revealed

Researchers at the University of Technology Sydney have made significant discoveries regarding the behavior of shell-coated upconversion nanorods, shedding light on their potential applications in bioimaging, sensing, and photonics. By studying the single-particle level, the team observed that directional growth of inert or active shells at the rod tips enhances emission relative to the parent core. This breakthrough has crucial implications for the future development of upconversion nanoparticles.

Key Takeaways:

• Researchers have synthesized nanorods with designed geometries to enable quantitative spectral analysis at the single-particle level.
• Directional growth of inert or active shells at the rod tips enhances emission relative to the parent core, with their relative effectiveness governed by power density and shell thickness.
• Ligand presence, whether polymer or oleate, quenches upconversion relative to bare nanorods.
• Local heating is observed at the single-particle level but does not affect spectroscopic observations, ligand stability, or data reproducibility.
• The study reveals how directionally grown shells influence the optical properties of upconversion nanorods.
• The findings provide essential insights for future applications in bioimaging, sensing, and photonics.
• Researchers Ming Lu, Yangjian Cai, Xian Qin, Dayong Jin, and Jiajia Zhou were involved in the study.
• The research was conducted at the Institute for Biomedical Materials & Devices (IBMD) at the University of Technology Sydney.

Statistics:

• 16(1):4927 is the reference number for the research paper.
• The research was published in Nature Communications.
• The study was conducted at the University of Technology Sydney.
• 2101 is the page number for the news report in Nanotechnology Weekly.

Sources:

• Nature Communications (2025;16(1):4927).
• University of Technology Sydney ().
• Institute for Biomedical Materials & Devices (IBMD) ().
• NewsRx LLC ().