A Direct Hybridization between Isocharged Nanosheets of Layered Metal Oxide and Graphene through a Surface‐Modification Assembly Process

Abstract

An efficient and universal method to directly hybridize isocharged nanosheets of layered metal oxide and reduced graphene oxide (rGO) is developed on the basis of the surface modification and an electrostatically driven assembly process. On the basis of this synthetic method, the CoO2 -rGO nanocomposite can be synthesized with exfoliated CoO2 and rGO nanosheets, and transformed into CoO-CoO2 -rGO nanocomposites with excellent electrode performance for lithium-ion batteries. Also, this surface-modification assembly route is successfully applied for the synthesis of another mesoporous TiO2 -rGO nanocomposite. This result provides clear evidence for the usefulness of the present method as a universal way of hybridizing isocharged anionic nanosheets of inorganic solids and graphene.

Reductive hybridization route with exfoliated graphene oxide and MoS2 nanosheets to efficient electrode materials

“…As presented in Fig. 2 the restacked MoS 2 -graphene nanohybrids and restacked MoS 2 materials commonly demonstrate the porous morphology formed by the house-of-cards type stacking structure of the exfoliated MoS 2 and graphene nanosheets [18][19][20][21]. This is sharply contrasted with the non-porous morphology of the bulk MoS 2 (Fig.…”

“…5b). Both the nanohybrids and restacked MoS 2 possess mesopores with the average sizes of $3-5 nm, which is formed by the house-of-cards-type stacking structure of nanosheets [18,20,29].…”

“…Although this crystal growth method makes possible a good electrical connection between rG-O and MoS 2 , it is not very effective in forming porous stacking structure. In comparison with the crystal growth of MoS 2 , the restacking between the exfoliated MoS 2 and graphene nanosheets is expected to be much more powerful in increasing the porosity of the resulting hybrid materials through the formation of house-of-cards-type stacking structure [18][19][20][21]. In this restacking process of pre-exfoliated nanosheets, the application of hydrothermal treatment would be helpful in improving the connectivity of these restacked nanosheets.…”

Application of Exfoliated Inorganic Nanosheets for Strongly‐Coupled Hybrid Photocatalysts

“…Copyright 2011 American Chemical Society. b) Self‐assembly–phase transformation route, c) self‐assembly–crystal growth route, d) surface modification–self‐assembly route, and e) link‐mediated self‐assembly route …”

“…Since the hybridization with exfoliated inorganic nanosheets relies on electrostatic interactions, it is necessary to modify the surface charge of exfoliated inorganic nanosheets for the synthesis of a nanohybrid composed of isocharged nanosheets. The surface anchoring of polycations, such as polydiallyldimethyl ammonium (PDDA) and polyethyleneimide (PEI), onto the exfoliated nanosheets changes the surface charge . As depicted in Figure d, the reaction between an anionic GO nanosheet and PDDA + polycations leads to the modification of the surface charge and the simultaneous reduction of GO to rGO.…”