Correlated spin systems in undoped CdSe quantum dots.

Blair, Michael; Muenchausen, Ross; Bennett, Bryan; Smith, Nickolaus; Warner, Marvin

The electronic properties of quantum dots have been studied extensively, and recent studies have explored various dopants that can alter electronic properties in quantum dots. Yet, we have found that impurities on the surface of nanometer-scale CdSe materials can also affect electronic properties. Specifically, nitrogen-based impurities on the surface of nanometer-scale CdSe materials (from ~4 to 15 nm) interact with the CdSe conduction electrons to yield an anti-ferromagnetic EPR signal at a high resonance field ( g ~ 0.56) that has an inverse Dysonian lineshape. However, bulk CdSe particles do not show the same types of EPR signals. This paper will discuss these observations, explain the underlying phenomena, and discuss implications for future research.

ELECTRON spin; CADMIUM selenide; QUANTUM dots; DOPING agents (Chemistry); METAL inclusions; CONDUCTION electrons; ELECTRON paramagnetic resonance spectroscopy

Journal of Nanoparticle Research, 2013, Vol 15, Issue 9, p1

1388-0764

Academic Journal

10.1007/s11051-013-1953-2