Use of electrochemical techniques to study the Langmuir–Blodgett films of redox active materials

Structural and electronic properties of pentacene/pentacenequinone thin films prepared on various solid-state substrates by the Langmuir–Blodgett technique are reported. Amorphous structure of the prepared films has been proved by XRD measurements. Oxygen-related defects have been identified in the Langmuir–Blodgett films as a consequence of the exposure of pentacene Langmuir layer to air. Crystallization induced by thermal treatment of the prepared amorphous thin films has been observed. Electronic properties of pentacene/ pentacenequinone Langmuir–Blodgett films have been investigated in the contact-less architecture using electrochemical techniques. The energy band diagram of the amorphous pentacene/pentacenequinone Langmuir–Blodgett film on a metallic surface was constructed from the obtained electrochemical data.

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Electrochemistry of the Redox-Active Langmuir–Blodgett Films Coated on Glassy Carbon Electrodes

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.59.2375 ◽

1986 ◽

Vol 59 (8) ◽

pp. 2375-2379 ◽

Cited By ~ 18

Author(s):

Masamichi Fujihira ◽

Toshinari Araki

Keyword(s):

Glassy Carbon ◽

Carbon Electrodes ◽

Glassy Carbon Electrodes ◽

Langmuir Blodgett ◽

Redox Active ◽

Langmuir Blodgett Films

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Application of electrochemical techniques to the study of Langmuir-Blodgett films of N-octadecylpyridinium-Ni(dmit)2

Thin Solid Films ◽

10.1016/s0040-6090(95)08379-0 ◽

1996 ◽

Vol 284-285 ◽

pp. 512-515 ◽

Cited By ~ 3

Author(s):

L.M. Goldenberg ◽

A.P. Monkman ◽

C. Pearson ◽

J. Gibson ◽

M.R. Bryce ◽

...

Keyword(s):

Electrochemical Techniques ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

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Effect of Divalent Cations in Langmuir-Blodgett Films on the Protection of Copper against Corrosion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.537-538.9 ◽

2007 ◽

Vol 537-538 ◽

pp. 9-16 ◽

Cited By ~ 4

Author(s):

F. Al-Taher ◽

J. Telegdi ◽

Erika Kálmán

Keyword(s):

Hydroxamic Acid ◽

Divalent Cations ◽

Electrochemical Techniques ◽

Contact Angle Measurement ◽

Copper Surface ◽

Angle Measurement ◽

Copper Corrosion ◽

Corrosive Media ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

Langmuir-Blodgett films (LB) of hydroxamic amphiphiles were used as coating barriers on metal surface against corrosion. Two long-chain hydroxamic acids [CH3(CH2)16CONHOH] monolayers in the presence of some divalent cations (Ca2+, Mg2+, and Cu2+) have been studied at different pH of the subphase. The monolayer was characterized by surface pressure-area isotherms and visualized by Brewster angle microscope (BAM). Compact Langmuir layers were deposited on copper surface, where the modified surfaces were characterized by contact angle measurement as well as by electrochemical techniques. The morphology of LB coated copper surface was visualized by atomic force microscopy (AFM). The coated copper surfaces were tested in corrosive media at acidic and neutral pH. The results show that the multi-molecular LB films of hydroxamic acid salts form good barriers against copper corrosion. The comparison of these results with copper coated by LB layers without divalent cations shows that the presence of divalent cations in the subphase increases the copper corrosion inhibition. The octadecanoyl hydroxamic acid (C18N) results in better and more stable monolayer with cations in the subphase.

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