Facile synthesis of luminescent carbon dots from mangosteen peel by pyrolysis method

Carbon dots (c-dots) from mangosteen peel has been synthesized by pyrolysis method. synthesis of c-dots is done using precursor solution which is prepared from extract of mangosteen peel as carbon source and urea as passivation agent. c-dots is successfully formed with absorbance spectra at wavelength 350–550 nm. urea affects to the formed c-dots,while the absorbance and the luminescent spectra are independent toward urea. c-dots from extract of mangosteen peel has size in range ~2–15 nm. the absorbance peaks of c-dots shows significant wavelength shift at visible region as the increasing of synthesized temperature. shift of wavelength absorbance indicates the change of electronic transition of c-dots. meanwhile,the luminescent of c-dots can be controlled by synthesized temperature as well. c-dots luminescent were increasing as higher synthesized temperature. it was shown by the shift of wavelength emission into shorter wavelength,465 nm at 200 °c,450 nm at 250 °c,and 423 nm at 300 °c. synthesized temperature also affects size of c-dots. it has size ~10–15 nm at 200 °c,~7–11 nm at 250 °c and ~2–4 nm at 300 °c. in addition,temperature corresponds to the structure of carbon chains and c–n configuration of formed c-dots from mangosteen peel extract. © 2017,the author(s).