Sandwich-like CdSe(en)0.5 nanosheet crystals (80 nm×200 nm×2 μm) serve as monolayer matrix to alter magnetic properties of colloidal semiconductors having wide band gaps. Chemical doping of four transition ions (Mn2+, Gd3+, V5+, Ni2+) have been successfully demonstrated in CdSe(en)0.5 nanosheets which have strong quantum confinement effects along thickness dimension. By varying doping concentrations (0.2-7%), spin and magnetic properties were rationally revealed by EPR and SQUID while crystal structures and parameters from XRD and TOPAS fittings remain identical. The unpaired electrons in ion centers were significantly perturbed by the strong quantum confinement, resulting stoke-shift in fluorescence but no change in absorption. Magnetic hysteresis induced by these magnetic ions suggests future spintronic applications of these nanosheet crystals.

Magnetic diluted semiconductors in 2D nanosheet crystals

254th National Meeting (2017)

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