| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Amphiphilic Bio-molecules/ZnO Interface: Enhancement of Bio-affinity and Dispersibility |
| MENG Xiu-Qing**, FANG Yun-Zhang, WU Feng-Min |
Research Center for Light Emitting Diodes (LED), Zhejiang Normal University, Jinhua 321004
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| Cite this article: |
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MENG Xiu-Qing, FANG Yun-Zhang, WU Feng-Min 2012 Chin. Phys. Lett. 29 016801 |
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Abstract The dispersibility of bio-molecules such as lecithins on the surface of ZnO nanowires are investigated for biosensor applications. Lecithins can be absorbed on an as-synthesized ZnO nanowire surface in the form of sub-micro sized clusters, while scattering well on those annealed under oxygen atmosphere. Wettability analysis reveals that the as-synthesized ZnO nanowires bear a super-hydrophobic surface, which convents to superhydrophilic after oxygen annealing. First-principles calculations indicate that the adsorption energy of ZnO with water is about 0.2 eV at a distance of 2 Å when it is superhydrophilic, suggesting that lecithin can be absorbed on the hydrophilic surface stably at this distance and the bio-affinity can be enhanced under this condition.
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| Keywords:
68.35.Bg
68.35.Ja
63.20.Dk
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Received: 12 August 2011
Published: 07 February 2012
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| PACS: |
68.35.bg
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(Semiconductors)
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68.35.Ja
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(Surface and interface dynamics and vibrations)
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63.20.dk
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(First-principles theory)
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