Photoelectrochemical behaviour of CdS Q-state semiconductor particles in 10,12-nonacosadiynoic acid polymer langmuir-blodgett films

• Published in: Journal of materials science Vol. 34; no. 21; pp. 5285 - 5291
• Main Authors: MANSUR, H. S, VASCONCELOS, W. L, GRIESER, F, CARUSO, F
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.11.1999; Springer Nature B.V
• Subjects: Applied sciences; Cadmium sulfide; Calomel electrode; Exact sciences and technology; Hydrogen sulfide; Langmuir-Blodgett films; Materials science; Open circuit voltage; Photoelectrons; Physicochemistry of polymers; Polymer films; Polymers; Polymers and radiations; Properties and characterization; Volt-ampere characteristics; X ray photoelectron spectroscopy; Semiconductor materials; Voltage current curve; Use; Photoinduced effect; Diacetylene polymer; Surface analysis; Experimental study; Calcium Sulfides; Conducting polymers; Polyelectrolyte; Electrochemical properties; Photopolymerization; Preparation; Photoelectrochemical cell; Doped polymer; Polyacid; Langmuir Blodgett layer
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004784501939

CdS “Q-state” semiconductor particles from 2 to 10 nm diameter were nucleated and grown in 10,12-nonacosadiynoic acid (NCDA) polymer Langmuir-Blodgett (LB) films deposited on ITO plates. The polymerization process through exposure to UV-Visible light resulted in formation of the “blue form” followed by the final “red form” after 60 min. X-ray photoelectron spectroscopy (XPS) measurements confirmed the deposition of the NCDA cadmium salt and the formation of the CdS particles after exposure to H2S(g) in the LB matrix. A study of the photoelectrochemical behaviour of these systems was conducted through polarisation current-voltage (I-V) curves in the range of 0 to −1000 mV (Standard Calomel Electrode-SCE). An average open-circuit voltage (VOC) from −600 to −700 mV values was observed for photoelectrochemical (PEC) cells constructed for the undoped NCDA polymer LB film with 10 nm diameter CdS particles. The I2-doped NCDA polymer film presented an increase in the conductivity compared with the undoped film but with a deterioration of stability of the PEC system.