Comments on 'Electric-Field-Assisted Growth of Highly Uniform and Oriented Gold Nanotriangles on Conducting Glass Substrates'

A critical comment on a paper by Sajanlal and Pradeep on 'electric-field-assisted growth of highly uniform and oriented gold nanotriangles on conducting glass substrates' is presented. Sajanlal and Pradeep reported the growth of well-aligned gold nanotriangle (NT) arrays on indium tin oxide (ITO) substrates using an electric-field-assisted chemical method. They claimed that the gold NTs synthesized by this method are not only highly uniform in size but also well oriented on the conducting substrates. Direct support for this viewpoint was mainly provided by contact mode and tapping mode atomic force microscopy (AFM) measurement. The authors also showed in their AFM images that, with the assistance of an electric-field, all the obtained NTs are highly consistent in their orientation, with no exception. Unless the authors provide more direct experimental evidence, such as SEM images, it can be said that the highly uniform and oriented nanotriangles observed in the AFM images by Sajanlal and Pradeep are old.