The fabrication of nanosensors involves several key steps: 1. Material Synthesis: The first step is to synthesize the nanomaterials, which can be done through methods like chemical vapor deposition (CVD), sol-gel processes, or electrochemical deposition. 2. Patterning and Structuring: Techniques such as lithography, nanoimprinting, and self-assembly are used to pattern and structure the nanomaterials on a substrate. 3. Integration and Functionalization: The nanomaterials are then integrated into the sensor device and functionalized with specific biomolecules or chemical groups to target the desired analytes. 4. Packaging and Testing: Finally, the sensor is packaged to protect it from environmental factors and tested for performance metrics such as sensitivity, selectivity, and stability.