Ko, Young-Jin Cho, Jung-Min Kim, Inho Jeong, Doo Seok Lee, Kyeong-Seok Park, Jong-Keuk Baik, Young-Joon Choi, Heon-Jin Lee, Seung-Cheol Lee, Wook-Seong 2024-01-20T04:32:48Z 2024-01-20T04:32:48Z 2021-09-05 2016-04 2045-2322 https://pubs.kist.re.kr/handle/201004/124235 We analyzed the nanodiamond-derived onion-like carbon (OLC) as function of synthesis temperature (1000 similar to 1400 degrees C), by high-resolution electron microscopy, electron energy loss spectroscopy, visible-Raman spectroscopy, ultraviolet photoemission spectroscopy, impedance spectroscopy, cyclic voltammetry and differential pulse voltammetry. The temperature dependences of the obtained properties (averaged particle size, tensile strain, defect density, density of states, electron transfer kinetics, and electrochemical oxidation current) unanimously coincided: they initially increased and saturated at 1200 degrees C. It was attributed to the inherent tensile strains arising from (1) the volume expansion associated with the layer-wise diamond-to-graphite transformation of the core, which caused forced dilation of the outer shells during their thermal synthesis; (2) the extreme curvature of the shells. The former origin was dominant over the latter at the outermost shell, of which the relevant evolution in defect density, DOS and electron transfer kinetics determined the electrochemical performances. In detection of dopamine (DA), uric acid (UA) and ascorbic acid (AA) using the OLC as electrode, their oxidation peak currents were enhanced by factors of 15 similar to 60 with annealing temperature. Their limit of detection and the linear range of detection, in the post-treatment-free condition, were as excellent as those of the nano-carbon electrodes post-treated by Pt-decoration, N-doping, plasma, or polymer. English Nature Publishing Group Inherently-Forced Tensile Strain in Nanodiamond-Derived Onion-like Carbon: Consequences in Defect-Induced Electrochemical Activation Article 10.1038/srep23913 1 Scientific Reports, v.6 Scientific Reports 6 Y scie scopus 000373205000001 2-s2.0-84962826201 Multidisciplinary Sciences Science & Technology - Other Topics Article NITROGEN-DOPED GRAPHENE RAMAN-SPECTROSCOPY ASCORBIC-ACID URIC-ACID NANOTUBES DOPAMINE CATALYST PURIFICATION TEMPERATURES PERFORMANCE