| Summary: | The development of novel and effective sensors is inevitable for detecting environmental pollutants, including toxins, organic pollutants, and heavy metals, which have hazardous effects on living organisms. Despite the challenges faced by this technology, sensors have played a crucial role in detecting various analytes with high sensitivity and producing reliable results. Metal nanoparticles, owing to their significant optical properties, unique sizes, shapes, and biocompatibility, have been widely utilized in detecting numerous hazardous pollutants such as heavy metals, textile dyes, pesticides, herbicides, banned surfactants, and harmful food supplements. The fundamental characteristic of these nanomaterials is their ability to change color based on their maximum absorption wavelength, known as surface plasmon resonance (SPR). Due to the simplicity, speed, and sensitivity of nanoparticle-based colorimetric sensing, this method has been extensively utilized in rapid testing, real-time monitoring, and reducing the time required to assess the quality and safety of water. Recently, this property has been extensively exploited for detecting various pollutants, including thiocyanate ions, which affect water quality.In this review, we discuss the preparation methods, functional enhancement, and optical property diagnosis of newly developed nanometals as colorimetric sensors and their application as rapid testing tools for detecting thiocyanate ions in water models. Additionally, we outline the suggested colorimetric sensing mechanism for this ion, along with the advantages and drawbacks of colorimetric sensors based on nanometals. This discussion aims to provide researchers with insights to avoid these limitations and encourage the development of better sensors in the future.
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