Fig. 2From: High-Performance Ultraviolet Photodetector Based on Graphene Quantum Dots Decorated ZnO Nanorods/GaN Film Isotype Heterojunctionsa TEM image (inset: size distribution of GQDs). b HRTEM image of GQDs. c UV-vis spectra and PL spectra of the GQDs (the excitation wavelength is 365 nm). d XPS survey spectra. e C 1s high-resolution XPS spectra. f O 1s high-resolution XPS spectraBack to article page