Esther Asedegbega-Nieto*, María Pérez-Cadenas, Jonathan Carter, James A Anderson and Antonio Guerrero-Ruiz
* Corresponding author: Esther Asedegbega-Nieto easedegbega@ccia.uned.es
Nanoscale Research Letters 2011, 6:353 doi:10.1186/1556-276X-6-353