Nano Archive

Bioassisted capture and release of nanoparticles on nanolithographed ZnO films

Shimada, Y and Suzuki, M and Sugiyama, M and Kumagai, I and Umetsu, M (2011) Bioassisted capture and release of nanoparticles on nanolithographed ZnO films. Nanotechnology, 22 (27). p. 275302.

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Using an artificial peptide library, we have identified a peptide that has strict selective affinity for ZnO surfaces. The binding affinity of the peptide on the ZnO surface can be controlled simply through changes in phosphate concentration at constant pH and temperature. In this study, we functionalized inorganic nanoparticles by orderly conjugating ZnO-binding peptides (ZnOBPs) on the surface of cadmium selenide (CdSe) nanoparticles and performed spontaneous and reversible nanopatterning of ZnOBP-displayed nanoparticles on lithographed ZnO films. Conjugation of ZnOBPs on CdSe nanoparticles caused spontaneous adsorption of the nanoparticles on a ZnO film, and fluorescence and cathodoluminescence images clearly showed specific adsorption of nanoparticles on the ZnO films lithographed on nano- and micrometer scales. The selectively bound nanoparticles on ZnO films were completely released by changing the phosphate concentration in solution; such release did not require heat or mechanical applications. Repeated capture and release of nanoparticles were achieved on the micrometer scale. Our results show the potential of material-binding peptides for nanopatterning and dynamic microarrays.

Item Type:Article
ID Code:11142
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:23
Last Modified:02 Nov 2011 00:47

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