In our presentation titled "Nanotech & Optoelectronics Neural Interfaces," we will explore the integration of nanotechnology and optoelectronics in the development of advanced neural interfaces. By utilizing advanced nanofabrication techniques and dense connectorization, we developed the PtNRGrid, a cutting-edge micro-ECoG grid. This thin-film neurophysiological recording electrode features thousands of channels and has been successfully applied to human brains in intraoperative settings. This micro-ECoG grid, enhanced by low impedance platinum-nanorods, offers excellent electrocorticography recording with unprecedented spatial resolution and cortical coverage. Another key to our innovation is the incorporation of flexible micro-LED displays, an optoelectronic component that provides real-time, automated feedback directly from the cortical surface. Our system not only captures intricate brain dynamics with high precision but also visualizes functional brain boundaries and epileptic discharges on the cortical surface. This integration of nanotechnology and optoelectronics represents a significant advancement in neurotechnology, empowering surgeons to conduct surgeries with high precision and efficiency, guided by high-resolution functional mapping of brain and real-time cortical feedback.