Construction Of Two-dimensional Gold Nanofilms And Research On Ion Transport Behavior

With the rapid development of micro-nano technology,nanochannels have received extensive attention as an important subject in the study of nanofluid.In this paper,based on gold nanoparticles(Au NPs),two-dimensional gold nanofilm ion channels have been successfully constructed through interface assembly and phase transfer technology.The transport behavior of ions through the confined environment of the ion channel has been systematically studied,and the possibility of its application in energy conversion has been realized.In addition,chiral molecules were introduced into the system to construct chiral ion channels.On the one hand,we explored the origin of the chirality of nano films.On the other hand,we discussed in-depth the photoelectric conversion characteristics of chiral ion channels and applied them to circularly polarized light(CPL)detection.The main research contents of this paper are as follows:Firstly,based on the self-assembly of Au NPs modified by polyethylene glycol molecules at the liquid-liquid interface,combined with the porous anodic aluminum oxide template,twodimensional gold nanofilm ion channels have been successfully constructed.The obtained ion channel owned a good structure and measurement stability.The construction strategy of monolayer and multilayer gold nanofilm ion channels have laid the foundation for the research of ion transport in short-distance nanochannels.Secondly,the asymmetric transport behavior of ions through the gold nanofilm ion channels has been discovered.On the one hand,the influence of the external environment in which the gold nanofilm ion channel was located,such as electrolyte concentration and pH,on the ion transport behavior has been studied.On the other hand,the effects of pores size,nanofilm thickness,chargeability,hydrophilicity of gold nanofilms on ion transport behavior have been foucsed.Furthermore,the possibility of the nanofilm ion channels application in the field of energy conversion has been explored.Thirdly,chiral gold nanofilms were successfully prepared by self-assembly of Au NPs modified with chiral amino acid molecules through the liquid-liquid interface,with CD intensity of 350 mdeg.The structure and optical activity of the obtained chiral gold nanofilms were characterized in detail.By optimizing the type and concentration of chiral ligands,the size of Au NPs and so on,the mechanism of chirality generation of gold nanofilms was revealed.Fourthly,the phenomenon of ion transmission in the chiral gold nanofilm ion channel driven by CPL was discovered.Accompanying the obvious correlation between photocurrent signal and light polarization characteristics,that is,ion channels modified by L-phenylalanine showed photocurrent under right-handed CPL nearly twofold higher than under left-handed illumination;the opposite was true for ion channels modified with D-Phe.Moreover,the photocurrent across the layer under RCP illumination is 1.47,1.87,2.20 and 2.41 times than that under LCP for monolayer,3-layers,5-layers,and 10-layer nanofilms,respectively.Based on this,through experimental verification and theoretical calculations,the optoionic phenomenon and the internal mechanism of CPL sensitivity were explained.Finally,the chiral nano film ion channel was successfully applied to polarized light detection.