Kim, Haena Jang, Jeong In Kim, Hyun Ho Lee, Geon-Woong Lim, Jung Ah Han, Joong Tark Cho, Kilwon 2024-01-20T05:01:12Z 2024-01-20T05:01:12Z 2021-09-04 2016-02-10 1944-8244 https://pubs.kist.re.kr/handle/201004/124389 The size of chemically modified graphene nanosheets is a critical parameter that affects their performance and applications. Here, we show that the lateral size of graphene oxide (GO) nanosheets is strongly correlated with the concentration of graphite oxide present in the suspension as graphite oxide is exfoliated by sonication. The size of the; GO nanosheets increased from less than 100 nm to several micrometers as the concentration of graphite oxide in the suspension was increased up to a critical concentration. An investigation of the evaporation behavior of the GO nanosheet solution using inkjet printing revealed that the critical temperature of formation of a uniform film, T-c, was lower for the large GO nanosheets than for the small GO nanosheets. This difference was attributed to the interactions between the two-dimensional structures of GO nanosheets and the substrate is well as the interactions among, the GO nanosheets. Furthermore, we fabricated organic thin film transistors (OTFTs) using line patterned reduced GO as electrodes. The OTFTs displayed different electrical performances, depending on the graphene sheet size. We:believe that our new strategy to control the size of GO nanosheets and our findings about the colloidal and electrical properties of size-controlled GO nanosheets will be very effective to fabricate graphene based printed electronics. English American Chemical Society LIQUID-PHASE EXFOLIATION TRANSPARENT DISPERSION PATTERNS FILMS WATER Sheet Size-Induced Evaporation Behaviors of Inkjet-Printed Graphene Oxide for Printed Electronics Article 10.1021/acsami.5b10704 1 ACS Applied Materials & Interfaces, v.8, no.5, pp.3193 - 3199 ACS Applied Materials & Interfaces 8 5 3193 3199 scie scopus 000370211400035 2-s2.0-84958206235 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article LIQUID-PHASE EXFOLIATION TRANSPARENT DISPERSION PATTERNS FILMS WATER graphene oxide exfoliation size evaporation behavior electrical conductivity printed electronics