Silver nanoparticles are widely used as reagents for enhancing Raman scattering in SERS due to their stability and excellent enhancement properties.
On March 29, 2024, Nano Convergence reported an economically efficient, easy to operate, and environmentally friendly method for in-situ manufacturing of SERS substrates.
This method utilizes the self-assembly of bCP in a single droplet to form an organic thin film doped with silver nanoparticles (AgNPs) on the surface of paper for the first time. The researchers used micro liter level ultra-low components, and the entire self-assembly process occurred at the air/liquid interface of a single droplet deposited on a paper substrate.
The research results indicate that bCP has a dual function. One is to promote the self-assembly of silver loaded thin films, and the other is to stabilize micro droplets. SEM analysis showed that with the help of self-assembled copolymer films, AgNPs with an average size of 47.5nm were formed. These morphological characteristics of AgNPs endow the paper surface with plasma characteristics.
In addition, researchers investigated the sensitivity of the designed nano hybrid electro pulp paper substrate by recording the SERS curve of Rhodamine 6G (R6G) aqueous solution, with a LOD value of 48.9pM. As a proof of concept, the detection limits of nanohybrid plasma paper for two newly emerging pollutants, sildenafil (SD) and flubenzelin (FLBN), are 1.48nM and 3.45nM, respectively.

The advantage of this new method is that it can bypass additional steps such as synthesizing colloidal nanoparticles when preparing ultra sensitive and reproducible SERS substrates, and is expected to develop into an on chip laboratory detection device.

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