We developed a new method for the preparation of connected-spherical gold nanoparticles(GNPs),which exhibited surface plasmon resonance properties different from those of spherical GNPs.In this method,citrate-stabilized GNPs in spherical form were connected to each other by use of cetyltrimethylammonium bromide,and then the progressing connection of GNPs in solution was restrained by the coverage of thin silica layer on them.The connectivity of GNPs was analyzed by transmission electron microscopy images and optical absorption spectra.The modulus of the third-order nonlinear optical susceptibility of the twin-linked GNPs film was estimated as 1.61 X 10~(-9)esu(the real and imaginary parts were 1.55 X 10~(-9)and-4.24 X 10~(-10)esu,respectively).
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机译：我们开发了一种新的制备球形金纳米粒子的方法，该纳米粒子具有不同于球形GNPs的表面等离子体共振特性。在这种方法中，球形的柠檬酸盐稳定的GNPs通过相互连接而相互连接。十六烷基三甲基溴化铵，然后溶液中GNP的连接被薄的二氧化硅层覆盖而限制.GNP的连通性通过透射电子显微镜图像和光吸收光谱进行了分析。三阶非线性光学敏感性的模量双链GNPs薄膜的膜厚估计为1.61 X 10〜（-9）esu（实部和虚部分别为1.55 X 10〜（-9）和-4.24 X 10〜（-10）esu）。
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