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Unzipping of Single-walled carbon nanotubes for producing Graphene Nano-ribbon

Graphene is a one-atom-thick allotrope of carbon. It is a 2-dimensional nanomaterial. The structure is similar to honeycomb with sp2 hybridized carbon atoms. It possesses noticeable mechanical, electrical, and optical properties[1].

The production method of graphene involves chemical vapour deposition on copper/nickel metal sheet or via chemical/ mechanical exfoliation processes. The mechanical exfoliation process is one of the best technique for achieving defect-free graphene[2]. Graphene nanoribbons (GNR) are 1-dimensional graphene structures whose properties are defined by the width and the thickness of the GNR. This GNR is produced by lithography, chemical technique, and by unzipping nanotubes[3]. Among which unzipping provides mass production option.

The unzipping of the nanotubes can be done via various chemical and chemical-free processes[4], [5]. One of the easiest ways is the oxidative process in which sulfuric acid and potassium permanganate is being used to longitudinally cut the nanotubes which form the nanoribbons[6].

NoPo produces single-walled carbon nanotubes (SWCNT) via HiPCO® process which offers the narrow diameter distribution. Thus, unzipping this SWCNT will provide a consistent, single layer, almost similar width GNR. The NoPo HiPCO SWCNT can be purchased for your research via our online portal or by emailing to Feel free to contact us to know more about our HiPCO® nanotubes.


[1] A. T. Smith, A. M. LaChance, S. Zeng, B. Liu, and L. Sun, “Synthesis, properties, and applications of graphene oxide/reduced graphene oxide and their nanocomposites,” Nano Mater. Sci., vol. 1, no. 1, pp. 31–47, Mar. 2019. [2] “The Challenges Facing Graphene Commercialisation,”, 09-Jan-2015. [Online]. Available: [Accessed: 28-Jul-2019]. [3] D. V. Kosynkin et al., “Longitudinal unzipping of carbon nanotubes to form graphene nanoribbons,” Nature, vol. 458, no. 7240, pp. 872–876, Apr. 2009. [4] S. Mohammadi, Z. Kolahdouz, S. Darbari, S. Mohajerzadeh, and N. Masoumi, “Graphene formation by unzipping carbon nanotubes using a sequential plasma assisted processing,” Carbon, vol. 52, pp. 451–463, Feb. 2013. [5] C. S. Tiwary et al., “Chemical-free graphene by unzipping carbon nanotubes using cryo-milling,” Carbon, vol. 89, pp. 217–224, Aug. 2015. [6] N. L. Rangel, J. C. Sotelo, and J. M. Seminario, “Mechanism of carbon nanotubes unzipping into graphene ribbons,” J. Chem. Phys., vol. 131, no. 3, p. 031105, Jul. 2009.

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