Home⇛Romblon State University Research Journal⇛vol. 5 no. 2 (2023)

In Situ Synthesis of Bare Silver Nanoparticles on Paper for Copper (II) Ion Detection

Shaira Mae D Valero | Glenn Rose M Suelan | Precious B Babar | Josie Faith N Calvo | Francis Eric P Almaquer

 

Abstract:

This study synthesized bare silver nanoparticles on paper and evaluated its response to copper (Cu (II)) ions to assess its potential as a colorimetric sensing platform. The nanoparticles were synthesized in situ on paper using silver nitrate and sodium borohydride as a precursor and reducing agent, respectively. No stabilizer or functionalizing agent was added. A two-factor three-level full factorial design with varying concentrations of reagents was employed in the synthesis process. The resulting sensor was successfully characterized using diffuse reflectance spectroscopy and scanning electron microscopy with elemental dispersive x-ray spectroscopy. The sensor was exposed to varying Cu (II) concentrations ranging from 1 to 30 mM and the developed color changes were analyzed using computer imaging software. The color changes were quantified using mean gray values from the imaging software. Based on the results, as the concentration of Cu (II) ions increased, the final mean gray value of the paper increased as well. The papers were observed to marginally lighten in color potentially due to the decrease in silver atoms or its interaction with copper. The relationship between Cu (II) concentration and the ratio of final and initial mean gray value was determined and although a weak linear relation existed from 1 to 30 mM, a positive slope supported the increase in mean gray value within the range tested. A change in the elemental composition of the paper sensor confirms lightening after its exposure to Cu (II) ions. The sensor also displayed a selective response towards the Cu (II) among other metals tested.



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