# Quantum dot enhanced photonic biosensors for single cell analysis from synthesis to clinical application

## TL;DR

This paper reviews quantum dot-based biosensors for single-cell analysis, focusing on their sensitivity, safety, and challenges in clinical use.

## Contribution

The paper provides a comprehensive review of recent advances and challenges in quantum dot biosensors for clinical applications.

## Key findings

- Heavy metal-free QDs like indium phosphide and carbon-based QDs offer high quantum efficiency and safety.
- Photonic enhancement techniques enable femtomolar detection limits with 240-fold signal amplification.
- Clinical translation is hindered by scalability and stability issues in biological environments.

## Abstract

The quantum dot (QD)-enhanced optical biosensors are very sensitive tools for analyzing single cells. Heavy metal-free alternatives, such as indium phosphide and carbon-based QDs, address safety concerns while achieving high quantum efficiency. Photonic enhancement techniques provide 240-fold signal amplification and quality factors of up to 7000, allowing femtomolar detection limits. However, clinical translation encounters manufacturing scalability and stability problems in complex biological matrices. This review discusses synthetic techniques, surface functionalization, and clinical implementation, highlighting important challenges and potential for improving QD-based biosensors.