C ONTRIBUTORS Miguel Ángel López (Chapter 5) Department of Analytical Chemistry and Chemical Engineering Faculty of Chemistry, University of Alcala Madrid, Spain Beongki Cho (Chapter 6) Department of Material Science and Engineering and Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju 500-712, Republic of Korea Miguel Jesús Alberto Escarpa (Chapter 5) Department of Analytical Chemistry and Chemical Engineering Faculty of Chemistry, University of Alcala Madrid, Spain