The patchy growth mode:Modulation of the Au-Au interface via phenynyl ligands

“补丁”生长模式:利用炔基配体调控金-金界面

Surface ligands play critical roles in nanosynthesis and thus it is of great importance in expanding the scope of suitable ligands.In this work,we explore phenynyl ligands in modulating the Au-Au interface when growing Au domains on Au seeds.A patchy growth mode is observed where the emerging islands are flat-laying with holes and branches.This growth mode is distinctively different from the conventional facet-controlled growth using weak ligands,and the non-wetting island growth using strong ligands.Through manipulating the molecular structure and the packing of the phenynyl ligands on the Au seeds,the overgrown Au domains are continuously tuned,from patches to islands,extending the plasmon absorption peak into the near-infrared spectral range.We believe that the new ligand with intermediate affinity and the unusual growth mode would expand the control in both synthesis and application.

表面配体在纳米合成中起着关键作用,扩大适用于纳米合成的配体范围具有重要意义.本工作中,我们系统研究了炔基配体在金种子上生长金时对金-金界面的调节作用.我们观察到了一种新的“补丁”生长模式:具有孔洞以及分支的金补丁“平躺”在金种子表面.这种生长模式与传统的弱配体控制的晶面生长以及强配体调控下的非润湿岛状生长截然不同.通过控制炔基配体的分子结构及其在金种子表面的排列,生长的金可以从补丁形状连续调节到岛状,同时其等离子体共振吸收从可见光区扩展到了近红外光谱区域.我们相信这类具有中等强度、能够控制特殊生长模式的新配体的应用,能够显著提升纳米合成及应用中的配体控制作用.