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－　　－36Keiichi SAKAMOTOProfessor, Department of Sustainable EngineeringKeiichi Sakamoto is a professor at Department of Sustainable Engineering, College of Industrial Technology, Nihon University. He received his B.S. in Engineering in Industrial Chemistry from Department of Industrial Chemistry, College of Science and Technology, Nihon University, and his M.S. in Engineering on Industrial Chemistry from Graduate School of Science and Technology, Nihon University, in 1983. He also received his Ph. D in Engineering on Industrial Organic Chemistry from Nihon University in 1992. Dr. Sakamoto’s research activities started at Department of Industrial Chemistry, College of Industrial Technology, Nihon University, in 1983. He moved to Department of Sustainable Engineering in 2009. Dr. Sakamoto has qualifications as Professional Engineer, Japan, APEC Engineer, and IPEA International Register of Professional Engineers.His research interests are in functional colorants chemistry, especially phthalocyanine and porphyrin chemistry including organic synthesis, electrochemistry, photochemistry, photophysical chemistry, laser-spectroscopy and catalytic properties. Specifically, Dr. Sakamoto’s research focuses on towered developments of photosensitizers for photodynamic therapy of cancer, dye sensitized solar cells, laser-printing systems and artificial photosynthesis. Dr. Sakamoto is a member of The Chemical Society of Japan (CSJ), American Chemical Society (ACS), Society of Porphyrins and Phthalocyanines (SPP), Japan Society of Coordination Chemistry, Japan Society of Colour Material, Japan Petroleum Institute, and The Institution of Professional Engineers, Japan.Research Achievements1) Synthesis of Alkylthio Substituted Pyridoporphyrazines and their Photophysicochemical Properties, J. Porphyrins Phthalocyanines 2017; 21: 658-664.2) Synthesis of Arylsulfanyl-subphthalocyanines and their Ring Expansion Reaction, J. Porphyrins Phthalocyanines 2015; 19: 688-694.3) Optical and Electrochemical Properties of Non-peripheral Thioaryl-substituted Subphthalocyanines as Precursors for Dye-sensitizer to Develop Photovoltaic Cells, Am. J. Anal. Chem. 2014; 5: 1037-1045.4) Syntheses of Near Infrared Absorbed Phthalocyanines to Utilize Photosensitizers, J. Porphyrins Phthalocyanines 2013; 17: 605-627.5) Cyclic Voltammetry of Non-peripheral Thioaryl Substituted Phthalocyanines, Dyes Pigments 2013; 96: 430-434.