NDLI: Biobased Janus molecule for the facile preparation of water solutions of few layer graphene sheets

Content Provider	Royal Society of Chemistry (RSC)
Author	Brambilla, Luigi Conzatti, Lucia Galimberti, Maurizio Serafini, Andrea Castiglioni, Chiara Guerra, Silvia Barbera, Vincenzina
Copyright Year	2015
Abstract	A biobased Janus molecule was used to prepare water solutions of nano-stacks made by few layer graphene. The Janus molecule was 2-(2,5-dimethyl-1H-pyrrol-1-yl)-1,3-propanediol (serinol pyrrole, SP), a serinol derivative obtained through the neat reaction of 2-amino-1,3-propandiol with 2,5-hexanedione, with atom efficiency of about 85%. SP contains the pyrrole ring, suitable for the interaction with carbon allotropes and hydroxy groups, that can easily interact with polar surroundings. Adducts, with about 14% by mass of SP, were prepared by reacting SP with a high surface area nano-sized graphite (HSAG), with about 35 graphene layers stacked in crystalline domains. Green methods were adopted, such as ball milling (HSAG–SP-M) and heating. Infrared spectra revealed peaks due to both HSAG and SP and additional peaks that could be attributed to the adduct. Both thermal and mechanical reactions left substantially unaltered the order in the graphitic layers and the interlayer distance, as shown by X-ray diffraction patterns. The relative intensity of the G and D band in the Raman spectrum was not modified by the thermal reaction, whereas enhancement of the D peak was observed after ball milling. Stable water solutions of HSAG–SP-M were prepared in a concentration range from 0.1 to 1 mg mL−1. Centrifugation allowed isolation of adducts with few stacked graphene layers, as revealed by high resolution transmission electron microscopy. An image of the adduct showed an organic layer tightly adhered to the carbon surface. SP appears a suitable molecule for the easy functionalization of carbon allotropes, such as nano-stacks of graphene layers, without substantially affecting the bulk crystalline organization and promoting the separation of the aggregates into stacks containing a low/very low number of graphene layers.
Starting Page	81142
Ending Page	81152
Page Count	11
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c5ra11387c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Interaction Centrifugation Raman spectroscopy Carbon X-ray crystallography D band (NATO) Transmission electron microscopy Janus Graphene Pyrrole Graphite 1,3-Propanediol Atom economy Adduct
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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