Dot-Like Formation of Metal Nanocrystals from Exfoliated Ruthenate Nanosheets

Abstract

We studied the metallization behavior of molecularly thin Ru0.95O 0.2− 2 nanosheets obtained from complete delamination of a layered ruthenate, K0.2RuO2.1. Heating at 200• C under a mixture of N2 and H2 transformed multilayers of the nanosheets into hcp-Ru metals. These metals have unique morphology reflecting the multilayer structure of the precursors. Interestingly, a monolayer state of the Ru0.95Onanosheets triggered a dot-like formation of Ru metal nanocrystals about 0.6 nm thick and several tens of nanometers wide, which represent a new family of 2D anisotropic metal nanomaterials.

Suppression of CO Adsorption on PtRu/C Catalysts Modified with Metallic Ruthenium Nanosheets

“…S4). Based on these data and our previous work, 24 it is concluded that H 2 treatment of RuO 2.1 ns-PtRu/C at 200…”

Conducting Nanosheets and Nanoparticles for Supercapacitors and Fuel Cell Electrocatalysts

“…RuO 2 nanosheets can be reduced to metallic 2D monolayer Ru nanosheets by hydrogen treatment. 58,59 Figure 13 (Fig. 13(b)), it is concluded that H 2 treatment of RuO 2 nanosheets at moderate temperatures results in topotactic reduction to metallic Ru nanosheets.…”

Direct Synthesis of Carbon–Molybdenum Carbide Nanosheet Composites via a Pseudotopotactic Solid-State Reaction

“…In the past decade, the primitive structural conversion of exfoliated nanosheets has demonstrated significant potential in the design of 2D materials; for example, the exfoliated nanosheets of the TiO 2 system in the monolayer state transformed into platelike TiO 2 anatase nanocrystallites upon heating to temperatures above 800 °C. , Moreover, it is well-known that the structural conversion of chalcogenide nanosheets such as MoS 2 produces several polymorphs with different properties. − In contrast to these structural conversions in binary systems, reduction of graphite oxide nanosheets into graphene without disruption of the sheet-structure can be depicted as a simplification of the material composition from a C–O binary system to a C monocomponent system . More recently, we have succeeded in producing unusual metal nanosheets via a similar topotactic reduction of oxide nanosheets, , indicating that a binary transition metal oxide system can be simplified in only transition metal elements. Thus, structural conversions using the exfoliated nanosheets are known to be mainly attained in the same composition system or a simpler composition system.…”

“…19−22 In contrast to these structural conversions in binary systems, reduction of graphite oxide nanosheets into graphene without disruption of the sheetstructure can be depicted as a simplification of the material composition from a C−O binary system to a C monocomponent system. 14 More recently, we have succeeded in producing unusual metal nanosheets via a similar topotactic reduction of oxide nanosheets, 23,24 indicating that a binary transition metal oxide system can be simplified in only transition metal elements. Thus, structural conversions using the exfoliated nanosheets are known to be mainly attained in the same composition system or a simpler composition system.…”