Nanosensors is a multidisciplinary research domain focused on the design, fabrication, and application of devices operating at the nanoscale (typically 1-100 nanometers) to detect and measure specific physical, chemical, or biological phenomena. This concept investigates the principles governing molecular interactions and signal transduction at the nanoscale, leveraging unique properties arising from reduced dimensions to achieve enhanced sensitivity, selectivity, and spatio-temporal resolution, which is significant for advancements in areas such as diagnostics, environmental monitoring, and advanced materials.