• Single-crystalline diamond nanowires embedded with platinum nanoparticles were fabricated for high-temperature solar-blind photodetection.
• At room temperature, the photodetector's responsivity represents a 2000-fold enhancement compared to bulk diamond. At 275 °C, the device demonstrates a responsivity of 3098.7 A W−1, while maintaining excellent spectral selectivity.
• Multiple factors synergistically enhance performance, including one-dimensional carrier transport channels, deep-level defects, localized surface plasmon resonance effect, and localized Schottky junctions.
• The Pt nanoparticle-embedded diamond nanowires show significant potential for advanced deep ultraviolet detection in harsh environments such as aerospace and industrial monitoring.