Article ID Journal Published Year Pages File Type
1525108 Materials Chemistry and Physics 2010 9 Pages PDF
Abstract

Bismuth sulfide quantum dots (ϕ ∼ 12 nm) with two-dimensional platelet morphology synthesized using a simple aqueous colloidal method exhibit directional growth along 〈2 1 1〉 direction. Impedance characteristics of this two-dimensional quantum structure yields a characteristic semi-circular profile due to a classical Voigt element in addition to a semi-circle like loop in the negative imaginary part of the impedance Nyquist plot. The apparent inductive reverse-loop impedance profile observed, a distinguishing feature of this study can be explained on the basis of an unusual negative resistor–capacitor combination, realized due to relaxation of surface states in this technologically important semiconductor–quantum structure.

Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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