Single-Molecule Detection Technologies: Advances in Devices, Transduction Mechanisms, and Functional Materials for...

Area of Science:

• Analytical Science
• Materials Science
• Biomedical Engineering

Background:

• Single-molecule detection (SMD) overcomes ensemble-averaged measurement limitations.
• SMD enables direct observation of individual molecular events.

Purpose of the Study:

• To provide a comprehensive analysis of SMD principles, devices, and emerging materials.
• To explore sensing mechanisms, nanomaterial roles, and diverse applications of SMD.
• To identify challenges and propose future research directions for SMD technologies.

Main Methods:

• Review of various sensing mechanisms: SPR, mechanochemical, transistor-based, optical microfiber, fluorescence, Raman, recognition tunneling.
• Analysis of advanced nanomaterials: graphene, CNTs, QDs, MnO2, UCNCs, magnetic nanoparticles.
• Examination of applications in diagnostics, environmental monitoring, food safety, neuroscience, materials science, and quantum technologies.

Main Results:

• Sensing innovations have achieved femtomolar to attomolar detection limits.
• Advanced nanomaterials enhance signal strength, specificity, and enable wearable platforms.
• SMD has broad applications in health, safety, and sustainability.

Conclusions:

• SMD faces challenges in reproducibility, biocompatibility, scalability, and data interpretation.
• Future directions include multimodal transduction, AI analytics, surface passivation, and modular design.
• SMD technologies are poised to significantly impact research and healthcare.