Dr Sarah Fearn is a Research Officer, Surface Analysis in the Materials Department at Imperial College London, UK where she conducts near-surface analysis of SOFCs and ionic conductivity measurements on nano-engineered structures. Her current research techniques include: isotope exchange, secondary ion mass spectrometry (SIMS), focused ion beam (FIB) microscopy, and low-energy ion scattering (LEIS). She received her PhD in 1999 from Imperial College London and spent nearly two years as a commercial SIMS analyst with Cascade Scientific before joining ICL in 2002.