= 아 래 =
1. 일 시 : 2012. 4. 17 (화), 16:00 ~
2. 장 소 : 응용공학동 1층 영상강의실
3. 연 사 : 한태희 교수 (한양대학교 류기나노공학과)
4. 제 목 : Porous Graphene Oxide: Synthesis and Chemical Sensors
Oxidative etching of graphene flakes was observed to initiate from edges and the occasional defect sites in the basal plane, leading to reduced lateral size and a small number of etch pits. In contrast, etching of highly defective graphene oxide and its reduced form resulted in rapid homogenous fracturing of the sheets into smaller pieces. Based on these observations, a slow and more controllable etching route was designed to produce nanoporous reduced graphene oxide sheets by hydrothermal steaming. The degree of etching and the concomitant porosity can be conveniently tuned by etching time. Etched graphene oxide patterns strongly support that graphene oxide sheets can be regarded as a 2-dimensiononal random block copolymer. In contrast to nonporous reduced graphene oxide annealed at the same temperature, the steamed nanoporous graphene oxide exhibited nearly two orders of magnitude increase in the sensitivity and improved recovery time when used as chemiresistor sensor platform for NO2detection.Theresultsunderscoretheefficacyofthehighlydistributednanoporousnetworkinthelowtemperaturesteametchedgraphene oxide.