(西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710072)
摘 要: 在室溫條件下，通過(guò)紫外光誘導(dǎo)方法在n型單晶硅表面成功地生長(zhǎng)出長(zhǎng)度為1.66~5.80 μm、寬度為1.27~2.84 μm、厚度在0.24~0.73 μm之間變化的銅微納米粒子。采用電子顯微鏡(SEM)觀察到單個(gè)銅粒子表面光滑，并出現(xiàn)數(shù)個(gè)粒子聚集形成K或L形狀的粒子團(tuán)聚現(xiàn)象。結(jié)果表明：改變?nèi)芤航M分濃度和光照時(shí)間可以對(duì)銅微納米粒子的尺寸和致密度進(jìn)行有效控制。以濃度為1×10-5 mol/L羅丹明6G作探測(cè)分子，對(duì)制備的銅微納米粒子薄膜的表面增強(qiáng)拉曼散射(SERS)效應(yīng)進(jìn)行研究，證實(shí)經(jīng)過(guò)銅微納米粒子修飾后的單晶硅對(duì)其表面吸附分子的拉曼信號(hào)確實(shí)有增強(qiáng)作用，這是因?yàn)殂~粒子的表面等離子體效應(yīng)能夠提高樣品表面局域場(chǎng)的電場(chǎng)強(qiáng)度。
關(guān)鍵字: 單晶硅；光誘導(dǎo)；微納米粒子；銅；表面增強(qiáng)拉曼散射
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:Copper micro-nanoparticles with edge lengths of 1.66-5.80 μm, width of 1.27-2.84 μm and thicknesses of 0.24-0.73 μm were grown on n-type silicon wafers photoinduced by the UV light at room temperature. The electron microscope characterizations (SEM) indicate that the single copper particle has smooth surfaces and several granules gather together to form different shapes like K and L. The results show that the density and dimensions of the resulting copper micro-nanoparticles can be controlled effectively by tuning the concentration of the solution components and illumination time of the varying reaction conditions. The micro-nano copper particles film from the surface-enhanced Raman scattering (SERS) effect using 1×10-5 mol/L Rhodamine 6G as probe molecules reveal that the single-crystalline silicon modified with copper micro-nanoparticles can enhance Raman signals of interesting molecules because the surface-plasmon effects of copper particles can improve the local electric fields of the sample.
Key words: photoinduced; single-crystalline silicon; micro-nanoparticle; copper; surface-enhanced Raman scattering
