Atmospheric-pressure chemical purification of detonation-synthesized nanodiamond by using perchloric acid: Intensive parametric study to control sp 3/sp 2carbon ratio

摘要

AbstractControlled- and high-sp3/sp2carbon ratio of the detonation-synthesized nanodiamond (DND) may play a very important role in many applications. Here, we demonstrated an atmospheric-pressure process of chemical purification using perchloric acid (HClO4) and intensively studied the control parameters including the reaction temperature, DND loading amount, and processing time. The sp3/sp2carbon ratio was characterized using UV-Raman spectroscopy (325nm) and is evaluated based on the intensity ratio (IDia/IG) of the diamond peak and G band peak at 1325cm?1and 1590cm?1, respectively. Through the combination of control parameters, we successfully controlled the intensity ratio ofIDia/IGat the range from 0.28 to 1.5 and achieved 15.5% higher than compared with commercial DND. In addition, we also investigated the electrical conductivity of DND vs. intensity ratio ofIDia/IGand the results show that lower intensity ratio ofIDia/IGhave higher electrical conductivity because of non-diamond carbon.Graphical abstractDisplay OmittedHighlights?Chemical purification of detonation-synthesized nanodiamond by using perchloric acid (HClO4)?The intensive parametric study to control sp3/sp2carbon ratio of detonation-synthesized nanodiamond?The controlled- and high- sp2/sp3carbon ratio by chemical purification?The controlled electrical conductivity based on sp2/sp3carbon ratio]]>