Abstract
In this work, we report novel methods to produce SERS encoded nanoparticles (SEPs). Either as single nanoparticles (NPs) or as more complex core-satellites structures. Single NPs are produced in an easy and fast one-pot approach which, are further use as building blocks to produce the core–satellite SEPs. The presented protocols are very versatile allowing the NPs SERS codification with an extensive variety of Raman codes. Moreover, this protocol can be applied to different NPs materials and shapes. Furthermore, the core–satellite SEPs are designed to exhibit minimal interparticle distances (<2–3 nm) with maximum satellite loading (i.e., maximum number of hot spots per assembly), while positioning the encoding agents at the gaps to achieve a very high optical efficiency. In addition to such versatility, these fabrication methods are simple, cheap, scalable and robust, yielding stable SPEs in high yields.
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