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Issue 15, 2016
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Colossal magnetoresistance in amino-functionalized graphene quantum dots at room temperature: manifestation of weak anti-localization and doorway to spintronics

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Abstract

In this work, we have demonstrated the signatures of localized surface distortions and disorders in functionalized graphene quantum dots (fGQD) and consequences in magneto-transport under weak field regime (∼1 Tesla) at room temperature. Observed positive colossal magnetoresistance (MR) and its suppression is primarily explained by weak anti-localization phenomenon where competitive valley (inter and intra) dependent scattering takes place at room temperature under low magnetic field; analogous to low mobility disordered graphene samples. Furthermore, using ab-initio analysis we show that sub-lattice sensitive spin-polarized ground state exists in the GQD as a result of pz orbital asymmetry in GQD carbon atoms with amino functional groups. This spin polarized ground state is believed to help the weak anti-localization dependent magneto transport by generating more disorder and strain in a GQD lattice under applied magnetic field and lays the premise for future graphene quantum dot based spintronic applications.

Graphical abstract: Colossal magnetoresistance in amino-functionalized graphene quantum dots at room temperature: manifestation of weak anti-localization and doorway to spintronics

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Publication details

The article was received on 30 Dec 2015, accepted on 07 Mar 2016 and first published on 11 Mar 2016


Article type: Paper
DOI: 10.1039/C5NR09292B
Citation: Nanoscale, 2016,8, 8245-8254
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    Colossal magnetoresistance in amino-functionalized graphene quantum dots at room temperature: manifestation of weak anti-localization and doorway to spintronics

    R. Roy, R. Thapa, G. S. Kumar, N. Mazumder, D. Sen, S. Sinthika, N. S. Das and K. K. Chattopadhyay, Nanoscale, 2016, 8, 8245
    DOI: 10.1039/C5NR09292B

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