Title:	In situ preparation of silver nanoparticles in polystyrene-b-poly (2-vinylpyridine) films over chemically patterned substrates.
Authors:	VIEIRA, M. F. ALMEIDA, C. G. de BRANDAO, H. de M. IZUMI, C. M. S.
Affiliation:	MOYRA F. VIEIRA, UNIVERSIDADE FEDERAL DE JUIZ DE FORA; CAMILA G. DE ALMEIDA; HUMBERTO DE MELLO BRANDAO, CNPGL; CELLY M. S. IZUMI, UNIVERSIDADE FEDERAL DE JUIZ DE FORA.
Date Issued:	2025
Citation:	Journal of the Brazilian Chemical Society, v. 36, n. 1, e-20240096, 2025.
Description:	The present work reports the in situ fabrication of Ag nanoparticles (AgNPs) in polystyreneb-poly(2-vinylpyridine) (PS-b-P2VP) over pre-patterned hydrophobic stripes on a hydrophilic glass surface. Microcontact printing (μCP) using octadecyltrichlorosilane (OTS) as “ink” was used to obtain these chemically modified substrates. A comparison of the results of the PS-b-P2VP self-assembly over a bare glass substrate and a pre-patterned glass substrate demonstrated the influence of the pattern on the film morphology. Polymeric films of Ag+ and PS-b-P2VP were prepared on a pre-patterned substrate and heated at 150 °C to enable the self-reconstruction of the polymeric matrix and the in situ formation of AgNPs (average particle size of approximately 100 nm). The AgNP/PS-b-P2VP thin films were characterized using UV-Vis spectroscopy and atomic force microscopy. The results demonstrate that the concentration of the solutions of Ag+ /PS-b-P2VP used to prepare the films strongly influences the morphologies and dispersion of AgNPs. Moreover, the surface-enhanced Raman spectroscopy (SERS) activity of the fabricated polymer nanocomposites using Nile Blue as a molecular probe shows the importance of the chemical modification of the substrate in the enhancement of the SERS signal.
NAL Thesaurus:	Nanoparticles
Keywords:	Nanopartícula Poliestireno Vidro hidrofílico
DOI:	https://dx.doi.org/10.21577/0103-5053.20240096
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPGL)