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• W2109473718 abstract "(Ga,Mn)As, [4,5] (Zn,M)O [6–9] , and (Ti,M)O2 [10–12] with M ¼ V, Cr, Mn, Co, Ni, and Cu. Despite the numerous reports on the successful observation of room temperature ferromagnetism (RTFM) in a number of these systems in apparent agreement with computations based on density functional theory, the issue remains unsettled and contentious for a number of reasons including lingering doubt of the possible role of undetected ferromagnetic impurities such as Fe, Co, and Ni. In some systems such as (Zn,Ni)O [13] and (Zn,Cr)Te [14] the observed RTFM has been linked to clustering of Ni and Cr nanocrystals, respectively. In this paper, we report the observation of RTFM in CdSe quantum dots (QD) capped with TOPO (tri-n-octylphosphine oxide). This RTFM is labeled as ex-nihilo since the RTFM is due to the marriage of two diamagnetic materials viz. CdSe and TOPO, possibly resulting from charge transfer from Cd d-band to the oxygen atoms of TOPO. We further show that the RTFM varies inversely with the size of the QD, in agreement with our calculations. CdSe is a II-VI semiconductor with direct band gap Eg ¼ 1.74 eV at 300 K. Semiconductors nanocrystals (NCs) such as CdSe are often called quantum dots (QD) when the size of the first Bohr radius exceeds the crystallite size D, leading to quantum confinement effects such as increase in the band-gap Eg with decrease in D. For the CdSe NCs, Eg can be tuned to cover the whole visible range by change in D, thus making this system potentially useful for solar energy applications. [15,16]" @default.
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• W2109473718 date "2008-05-05" @default.
• W2109473718 modified "2023-10-16" @default.
• W2109473718 title "Size-ControlledEx-nihilo Ferromagnetism in Capped CdSe Quantum Dots" @default.
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• W2109473718 doi "https://doi.org/10.1002/adma.200702382" @default.
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