Eui-Sup Lee

TL;DR: These experiments suggest that hydrazine treatment of graphene oxide causes insertion of an aromatic N(2) moiety in a five-membered ring at the platelet edges and also restores graphitic networks on the basal planes.

TL;DR: The polymorphic phase interface of bismuth ferrites is investigated using spatially resolved photocurrent measurements, the observation of a large enhancement of the anisotropic interfacial photocurrent by two orders of magnitude is presented, and the possible mechanism on the basis of the flexoelectric effect is discussed.

TL;DR: The photoluminescence (PL) origin of bright blue emission arising from intrinsic states in graphene quantum dots (GQDs) is investigated and is attributed to favorably formed subdomains composed of four to seven carbon hexagons.

TL;DR: Here it is shown that local thermoelectric measurements can yield high-sensitivity imaging of structural disorder on the atomic and nanometre scales, and uncovered point defects in the first layer of epitaxial graphene which generate soliton-like domain-wall line patterns separating regions of the different interlayer stacking of the second graphene layer.

TL;DR: A series of graphene oxide QDs with different amounts of oxygen-contents are first synthesized via a direct oxidation route of graphite nanoparticle and thoroughly compared with a series of reduced GOQDs prepared by the conventional chemical reduction.