其制备方法主要包括：制备单分散的磁性微粒；

The preparation method mainly comprises the following steps: preparing monodisperse magnetic fine particles;

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单分散的聚合物功能微球具有许多突出优点，如比表面积大、表面反应能力强等。

Monodisperse microspheres have many advantages, such as large specific area, high surface reaction capability and so on.

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通过利用银纳米粒子聚集体代替单分散的银纳米粒子作为SERS基底，SERS信号得到明显增强。

By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a great improvement of SERS signal intensity is achieved.

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