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Graphene, the thinnest two-dimensional material in nature,
has abundant distinctive properties, such as ultrahigh carrier
mobility, superior thermal conductivity, very high surface-tovolume
ratio, anomalous quantum Hall effect, and so on. Laterally
confined, thin, and long strips of graphene, namely, graphene
nanoribbons (GNRs), can open the bandgap in the
semimetal and give it the potential to replace silicon in future
electronics. Great efforts are devoted to achieving high-quality
GNRs with narrow widths and smooth edges. This minireview
reports the latest progress in experimental and theoretical
studies on GNR synthesis. Different methods of GNR synthesis¡ª
unzipping of carbon nanotubes (CNTs), cutting of graphene,
and the direct synthesis of GNRs¡ªare discussed, and
their advantages and disadvantages are compared in detail.
Current challenges and the prospects in this rapidly developing
field are also addressed.
.




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