Amphiphilic Bio-molecules/ZnO Interface: Enhancement of Bio-affinity and Dispersibility

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2012,（1）
• 页码范围: 206-208
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/0256-307X/29/1/016801

摘要

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(A) 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.