A sensor including a sensing layer is disposed over an electrode or an optode and a layer-by-layer assembled mass transport limiting membrane disposed over the sensing layer. The membrane includes at least one layer of a polyanionic or polycationic material. The assembled layers of the membrane are typically...http://www.google.co.uk/patents/US6746582?utm_source=gb-gplus-sharePatent US6746582 - Electrodes with multilayer membranes and methods of making the electrodes
