The field of electrochemical and optical sensors has witnessed a growing scientific attention and activity in the development and characterisation of new sensing materials and concepts. Recent applications of ion sensors have come through advances in sensor design, material improvements and progress in software innovations. All together is closely correlated and now the ion sensors provide lots of benefits in various areas including fundamental research and applied work such as commercial industries, manufacturing, pharmaceutical regulatory, environmental or forensic monitoring. Nevertheless there are still some limitations in sensing technology that remain unsolved. In order to overcome these limitations and gain more fundamental knowledge about processes and sensing mechanisms, we focused our attention on the development of such materials that would allow us to bring our goals to the successful completion.