Field effect transport properties of chemically treated graphene quantum dots

We report the field effect properties of lithographically fabricated FET with as-prepared graphene quantum dots (GQDs) and hydrazine treated GQDs as channel material. GQDs of 4.5 +/- 0.55 nm average diameter are synthesised via an electrochemical approach using multiwalled carbon nanotubes (MWCNTs) as precursor. After treatment in hydrazine vapour for 24 h, the field effect measurements yield hole mobility of 0.01 cm(2) V(-1)s(-1) and I-on/I-off ratio of about 45. Hydrazine treated channel shows a significant decrease in resistance in comparison to the channel with as-prepared GQDs and is p-type under ambient conditions.