A NEW CELL DESIGN FOR POTENTIOSTATICALLY CONTROLLED IN-SITU ATOMIC-FORCE MICROSCOPY

We describe the design and construction of a new type of AFM cell for in situ imaging under potentiostatic control. The cell is specifically designed for a Rasterscope 4000(TM) AFM instrument with no need for i nstrumental modification, but can easily be adapted to other commercia l instruments. The cell is a closed system with insignificant sample e vaporation. It is a chemically and mechanically robust two-component s ystem which enables fast assembly and testing prior to insertion and m inimizes leakage problems. The cell is also laterally flexible, facili tating scanning of large areas, holds inlets for rapid flushing and ch ange of solution, and contains an optical device for adjusting the las er beam deflection in aqueous and gas ambient environments. Cyclic vol tammetry of a simple redox couple and combined cyclic voltammetry and in situ AFM of copper deposition/dissolution cycles testify to perfect cell performance.