Conformation of Capping Ligands on Nanoplates: Facet-Edge-Induced Disorder and Self-Assembly-Related Ordering Revealed by Sum Frequency Generation Spectroscopy.
Conformation of Capping Ligands on Nanoplates: Facet-Edge-Induced Disorder and Self-Assembly-Related Ordering Revealed by Sum Frequency Generation Spectroscopy.
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DOI：
10.1021/acs.jpclett.5b00717
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Hao Zhang;Fujin Li;Qingbo Xiao;Hongzhen Lin
中科院分区：
文献类型：
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作者：
Hao Zhang;Fujin Li;Qingbo Xiao;Hongzhen Lin
当纳米粒子半径接近配体长度时，先前已经观察到烷基封端配体中的表面曲率放大的构象紊乱。在此，对油酸封端的纳米片的和频生成研究表明，即使在具有比配体长度大数十倍的尺寸的多面表面上，在封端层中也存在显著比例的笨拙缺陷。在纳米尺寸的刻面上的分子无序归因于刻面边缘效应，当增大刻面尺寸或将纳米刻面并排组装时，该刻面边缘效应减小。这一特点进一步探讨探测纳米片的自组装动力学。
Surface-curvature-amplified conformational disorder in alkyl capping ligands has been observed previously when the nanoparticle radii approach the ligand length. Herein, sum frequency generation studies on oleic-acid-capped nanoplates show that even on faceted surfaces with dimensions tens of times greater than the ligand length a significant proportion of gauche defects exist in the capping layer. The molecular disorder on the nanosized facets is attributed to a facet-edge effect, which is diminished when increasing the facet size or assembling the nanofacets side to side. This feature is further explored to probe the self-assembly dynamics of nanoplates.