The present invention discloses a radio frequency reader grid and method for facilitating transactions. The control unit analyzes the second image in consideration of the first set of images to derive information about the object. A SET made of semiconducting nanotubes may be used as access devices andor to build peripheral circuitry. The diamond-coated silicon is flexible and it can be adhered to the electrically conductive support substrate, and thereby a large area electrode and a three-dimensional electrode structure can be easily obtained.