# Nanomaterials for Sensory Systems—A Review

## TL;DR

Nanomaterials are being used to create highly sensitive food sensors that detect spoilage and contamination quickly, improving food safety and reducing waste.

## Contribution

This review comprehensively examines the use of nanomaterials in food sensory systems, highlighting innovations in detection methods and smart packaging.

## Key findings

- Nanosensors can detect food spoilage indicators with high sensitivity and rapid response times.
- Smart packaging with nanomaterials enables continuous freshness monitoring and early spoilage prevention.
- Examples include Au/AgNP melamine tests and Fe3O4/DPV detection systems with low detection limits.

## Abstract

Nanotechnology offers powerful new tools to enhance food quality monitoring and safety assurance. In the food industry, nanoscale materials (e.g., metal, metal oxide, carbon, and polymeric nanomaterials) are being integrated into sensory systems to detect spoilage, contamination, and intentional food tampering with unprecedented sensitivity. Nanosensors can rapidly identify foodborne pathogens, toxins, and chemical changes that signal spoilage, overcoming the limitations of conventional assays that are often slow, costly, or require expert operation. These advances translate into improved food safety and extended shelf-life by allowing early intervention (for example, via antimicrobial nano-coatings) to prevent spoilage. This review provides a comprehensive overview of the types of nanomaterials used in food sensory applications and their mechanisms of action. We examine current applications in detecting food spoilage indicators and adulterants, as well as recent innovations in smart packaging and continuous freshness monitoring. The advantages of nanomaterials—including heightened analytical sensitivity, specificity, and the ability to combine sensing with active preservative functions—are highlighted alongside important toxicological and regulatory considerations. Overall, nanomaterials are driving the development of smarter food packaging and sensor systems that promise safer foods, reduced waste, and empowered consumers. However, realizing this potential will require addressing safety concerns and establishing clear regulations to ensure responsible deployment of nano-enabled food sensing technologies. Representative figures of merit include Au/AgNP melamine tests with LOD 0.04–0.07 mg L−1 and minute-scale readout, a smartphone Au@carbon-QD assay with LOD 3.6 nM, Fe3O4/DPV detection of Sudan I at 0.001 µM (linear 0.01–20 µM), and a reusable Au–Fe3O4 piezo-electrochemical immunosensor for aflatoxin B1 with LOD 0.07 ng mL−1 (≈15 × reuse), alongside freshness labels that track TVB-N/amine in near-real time and e-nose arrays distinguishing spoilage stages.