Expression of Concern: Capturing the effect of the nanoshell aspect ratio on the resonance wavelength and quality factor in sensing applications using an impedance-based model

Nanoshells promise to be valuable in a wide range of applications ranging from chemical sensing to cancer treatment. Different applications require different performance from the nanoshell and pose different constraints on them, and thus the nanoshell sensor has to be designed according to the given application. In this regard, the resonance wavelength and the Q factor are the most important properties to consider. In this paper we provide analysis for the nanoshell resonance wavelength and Q factor based on an impedance model of the nanoshell.