Luminescent Gold Nanoclusters for Bioimaging: Increasing the Ligand Complexity

Area of Science:

• Biomedical Imaging
• Nanotechnology
• Materials Science

Background:

• Photoluminescence (PL) imaging offers advantages in speed, versatility, and instrumentation cost over other diagnostic techniques.
• Fluorescence imaging provides high spatial and temporal resolution but faces challenges with biological tissue transparency, autofluorescence, and contrast agent biocompatibility.
• Gold nanoclusters (AuNCs) demonstrate potential for biocompatible PL in the near-infrared (NIR) region, where tissue penetration is improved and autofluorescence is reduced.

Purpose of the Study:

• To review recent advancements in AuNCs for bioimaging applications.
• To highlight the critical role of ligand structure in modulating AuNC photoluminescence properties.
• To discuss the development of AuNCs as effective probes for enhanced bioimaging.

Main Methods:

• Review of recent literature on gold nanocluster (AuNC) synthesis and characterization for bioimaging.
• Analysis of the impact of ligand design on the photoluminescence (PL) properties of AuNCs.
• Discussion of AuNC applications in near-infrared (NIR) bioimaging, considering tissue transparency and autofluorescence.

Main Results:

• AuNCs can be engineered for biocompatibility and NIR PL, crucial for deep tissue imaging.
• Ligand choice significantly influences AuNC stability, PL intensity, and emission wavelength.
• Increasing ligand complexity allows for fine-tuning of AuNC functionalities for specific bioimaging tasks.

Conclusions:

• Ligand engineering is paramount for optimizing AuNCs as photoluminescent probes for bioimaging.
• AuNCs represent a promising class of contrast agents for overcoming current limitations in fluorescence imaging.
• Further research into ligand-AuNC interactions will unlock new possibilities for advanced biomedical diagnostics.