• Sensors 4.0 integrates IoT, AI, and big data, requiring sensors to be interconnected and intelligent, with flexibility and intelligence as key features.
• Flexible electronics introduce a new mechanical dimension, enabling deformable, miniaturized, and lightweight distributed sensory applications.
• The Special Issue covers three themes: flexible sensory applications for light, gas, and temperature; neuromorphic devices integrating sensing, memory, and computation; and integrated multimodal systems for IoT in biology and healthcare.
• The issue includes six research articles and ten review articles from leading experts, addressing stability, material selection, and device architectures for advanced sensing.