全息干版银膜的制备、表征及其SERS活性的研究

A Holographic Plate Silver Film-Preparation, Morphology and SERS Activity

报道了一种新的制备SERS基底的方法。通过对全息干版进行曝光、显影和定影,获得了具有良好 稳定性的固体银膜。用紫外-可见光谱测量其表面等离子体共振吸收,发现其吸收谱线在420 nm处存在银粒 子的特征吸收峰,且吸收峰具有较窄的半峰宽,这表明采用该方法制备的银膜表面分布着大小均一的银粒 子。用扫描电子显微镜对其表面粒子形貌进行表征,发现银粒子分布均匀且平均粒径为100 nm左右。同时 以结晶紫为探针分子测量了该银膜的表面增强拉曼光谱,结果表明该银膜具有良好的表面增强拉曼散射活 性。采用这种方法制备的银膜稳定性好且易于保存,在常温下空气中放置数月,仍能保持原有的表面增强拉 曼散射活性。

A new method for preparing SERS-active substrate was reported. After being exposed, developed and fixed, the commercially available holographic plate can be used to generate attractive SERS-active silver surface. The obtained silver film was characterized by UV-Vis spectroscopy and scanning electron microscope （SEM） observation. The absorption spectrum locates at around 420 nm with a narrow half-width due to the surface plasmon resonance, which implies that there are silver particles on the prepared substrate with uniform sizes. And the silver particles distribute uniformly anywhere on the holographic plate with a diameter of about 100 nm by SEM observation. Furthermore, the measurements of the SERS spectrum of crystal violet indicate that such substrate has the features of satisfactory reproducibility, long term stability and high SERS activity. The prepared silver film keeps high SERS activity even if it was stored for several months in the air at room temperature.