Abstract
Nanoscrolls (NSs) assembled from two-dimensional nanosheets have emerged as a novel type of one-dimensional nanomaterials because of their unique topological features and properties. The scale-up preparation of the NSs is crucial for their foundational and applied research. Herein, we report a general and straightforward approach for efficiently converting two-dimensional nanosheets into the NSs with high yield. We demonstrated the converting process by illustrating the formation of the graphene nanoscrolls through characterizing their morphology and structure using a scanning electron microscope, transmission electron microscope, Raman spectra, and X-ray diffraction spectra. The graphene sheets with a few-lay number were converted immediately and entirely into the graphene nanoscrolls when they mixed with an ethanol solution of silver nitrate at room temperature. The as-prepared graphene nanoscrolls were confirmed to be formed via the layer-by-layer assembly of graphene triggered by silver cyanide formed in site. Also, we extended this approach to construct the nanoscrolls of the hexagonal boron nitride, molybdenum disulfide, and tungsten disulfide, respectively, from their corresponding two-dimensional nanomaterials. In a broader context, this approach paves a significant new way for the large production of the NSs with cost-efficiency.
Highlights
Carbon nanoscrolls were discovered when making multiwalled carbon nanotubes[1,2]
We have demonstrated the formation of the nanoscrolls of graphene, h-boron nitride (h-BN), MoS2, and WS2 by verifying the morphology and structure of the formed NSs using scanning electron microscope, transmission electron microscope, Raman spectra, and X-ray diffraction spectra
In order to explore the conversion process of the graphene to the GNSs, we have examined the change of the morphology and structure of the graphene with the reaction period via the scanning electron microscope (SEM) characterization
Summary
The graphene sheets exfoliated from graphite are taken as the representative of the 2DNMs to discuss in detail. The calculation results (the relationship between the length and the diameter of the GNSs) are in good agreement with that made from the SEM and TEM images (Fig. 2a–d). It suggests that the mechanism of the forming GNSs aforementioned is reasonable. The single- or few-layer 2DNMs can quickly curl up into the NSs by mixing their ethanol solution with AgNO3 ethanol solution at room temperature It is the AgCN particles generated at the edge of the 2DNMs sheets that trigger the curling process.
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