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Biological self-assembled monolayers for photosynthetic solar cell and sensing applications

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4 Author(s)
K. B. Lam ; Dept. of Mech. Eng., Univ. of California, Berkeley, CA, USA ; Liwei Lin ; E. F. Irwin ; K. E. Healy

Photosynthetic sub-cellular plant structures called thylakoid were immobilized onto a gold electrode surface that had been functionalized by bioelectrocatalytic self-assembled monolayers (bio-SAMs) of cystamine and pyrroloquinoline quinone (PQQ). The goal is to achieve direct transfer of electrons from thylakoids to the electrode via the bio-SAMs to increase the electrical output of MEMS photosynthetic fuel cells. The immobilization technique could also be used in MEMS bio-sensing and microbial fuel cell applications. Quartz crystal microbalance with dissipation (QCM-D) was used to monitor the deposition kinetics of cystamine, PQQ, and thylakoids. Using QCM-D, the surface coverage of these three layers was determined to be, respectively, 7.9 × 10-10 mol/cm2, 3.3 × 10-10 mol/cm2, and 1.5 × 106 thylakoids/cm2. The cystamine and PQQ monolayers formed within 5 min, while the thylakoid layer required over 1 h. Each layer was shown to be covalently linked to the substrate or layer underneath and thus was able to survive repeated rinsing in water or buffer.

Published in:

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05.  (Volume:2 )

Date of Conference:

5-9 June 2005