Fig. 2From: Facile Synthesis and Optical Properties of Small Selenium Nanocrystals and NanorodsUV–visible optical spectra of Nano-Se being prepared at different temperatures: (a) 60 °C, (b) 80 °C, (c) 100 °C for 30 min; (d) 120 °C plus aging for 45 daysBack to article page