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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

In situ formation of gold and silver nanoparticles on uniform PDMS films and colorimetric analysis of their plasmonic color

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Yao, Jie-Yi [1] ; Fostier, Anne Helene [2] ; Santos, Elias Barros [1]
Total Authors: 3
[1] LQANano Fed Univ Sao Paulo, BR-12231280 Sao Jose Do Campos, SP - Brazil
[2] Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

The incorporation of metal nanoparticles (MeNPs), such as gold and silver (AuNPs and AgNPs), in polymer matrices for a diversity of applications, has gained much interest in recent years. However, a viable strategy for producing uniform samples remains challenging. In this work, we have demonstrated a facile procedure for loading AuNPs and AgNPs on previously prepared uniform polydimethylsiloxane (PDMS) films supported on glass slides, named AuNPs@PDMS and AgNPs@PDMS. The reaction of HAuCl4 or AgNO3, in an ethanol solution, with immersed PDMS films took place without the need to add other chemicals, resulting in uniform coverage of nanoparticles dependent on reaction time and temperature. Plasmonic colors of AuNPs@PDMS and AgNPs@ PDMS films were monitored collecting colorimetric data, expressed as total color difference Delta E, using a portable and handled spectrophotometer. As observed for colorimetric data, the UV-vis analysis of the SPR (surface plasmon resonance) absorption bands, at 530 nm for AuNPs@PDMS and 400 nm for AgNPs@PDMS, were dependent on the reaction time and temperature (25, 33, and 55 degrees C). The Delta E data exhibit a linear correlation with reaction time for all three investigated temperatures, and these results can be used as work curves in the future preparation of new samples. This study contributes to our understanding of the experimental conditions to produce uniform MeNPs@PDMS films with tunable plasmonic color. AuNPs@PDMS and AgNPs@PDMS films can be promising plasmonic and colorimetric sensors due to their performance and simple fabrication. (AU)

FAPESP's process: 18/07136-9 - Nanogold dispersed into glass and polymer matrices and its application as passive sampler for gaseous elemental mercury
Grantee:Elias de Barros Santos
Support type: Regular Research Grants