Chin. Phys. Lett.  2012, Vol. 29 Issue (1): 016801    DOI: 10.1088/0256-307X/29/1/016801
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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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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.
Keywords: 68.35.Bg      68.35.Ja      63.20.Dk     
Received: 12 August 2011      Published: 07 February 2012
PACS:  68.35.bg (Semiconductors)  
  68.35.Ja (Surface and interface dynamics and vibrations)  
  63.20.dk (First-principles theory)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/1/016801       OR      https://cpl.iphy.ac.cn/Y2012/V29/I1/016801
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MENG Xiu-Qing
FANG Yun-Zhang
WU Feng-Min
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