@article { ISI:000361697400005,
	title = {Fractional photo-current dependence of graphene quantum dots prepared from carbon nanotubes},
	journal = {Physical Chemistry Chemical Physics},
	volume = {17},
	number = {38},
	year = {2015},
	month = {AUG},
	pages = {24566-24569},
	publisher = {ROYAL SOC CHEMISTRY},
	address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND},
	abstract = {<p>We report on the photo-conductivity studies of chemically synthesized graphene quantum dots (GQDs) of average size 12 nm obtained by the oxidative acid treatment of MWCNTs. The dependence of photocurrent I-ph (I-ph = I-ill - I-dark) on the laser intensity P under a wide range of laser intensities (5 mW \&lt;= P \&lt;= 60 mW) shows a fractional power dependence of I-ph on light intensity. The temperature dependence (300 K \&lt; T \&lt; 50 K) of I-ph observed in thin films of these GQDs indicates that in the higher temperature region (T \&gt; similar to 100 K), as the temperature increases, the number of thermally generated carriers increase resulting in increased I-ph. At sufficiently low temperatures (T \&lt;= 100 K), a constant I-ph is observed, indicating a constant photocarrier density. Such a behavior is typically observed in many photoactive disordered semiconductors, which are often used in a variety of applications. We believe that the investigations presented here will enhance our understanding of the photocurrent generation phenomenon in chemically obtained GQDs.</p>},
	issn = {1463-9076},
	doi = {10.1039/c5cp03306c},
	author = {Kundu, Sumana and Ghosh, Sujoy and Fralaide, Michael and Narayanan, T. N. and Pillai, Vijayamohanan K. and Talapatra, Saikat}
}
