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通过Al 3+静电诱导实现了金纳米粒子(Au NPs)的一维(1D)或二维(2D)程序可控自组装。我们的研究发现,静电组装形成的Au NPs组装体(Au NAs)的尺寸、形貌及其表面等离子体共振(SPR)性质与Al 3+的浓度密切相关,随着Al 3+浓度的增加,Au NPs由孤立的Au纳米粒子组装成一维或二维的纳米阵列。同时,与孤立Au NPs相比,Au NAs因存在更多的“热点”而具有更好的SERS活性,并可以通过调节Al 3+的浓度来调控Au NAs的SERS活性。
One-dimensional (1D) or two-dimensional (2D) program controlled self-assembly of gold nanoparticles (Au NPs) was achieved by Al 3+ electrostatic induction. Our study found that the size, morphology and surface plasmon resonance (SPR) properties of Au NPs formed by electrostatic assembly are closely related to the concentration of Al 3+. With the increase of Al 3+ concentration, Au NPs consist of isolated Au nanoparticles assembled into one-dimensional or two-dimensional nano-arrays. At the same time, compared with isolated Au NPs, Au NAs has better SERS activity due to more “hot spots ”, and SERS activity of Au NAs can be regulated by adjusting the concentration of Al3 +.