resumo
Liquid-phase exfoliation (LPE) is a widely used top-down approach for producing two-dimensional (2D) materials on a large scale, including transition metal dichalcogenides (TMDs). Conventional LPE procedures face significant challenges, namely the use of fossil-derived organic chemicals, such as solvents and stabilizing agents. However, the use of colloidal nanoparticles or inorganic nanostructures as stabilizing agents to exfoliate TMDs has been less explored despite offering the possibility to synthesize composites with unique properties. This research reports an innovative one-step approach for fabricating 2D MoS2/AuNPs composites with distinct morphologies using an ultrasound-assisted LPE. This method comprises the exfoliation of MoS2 commercial powders (bulk) using colloidal Au nanoparticles (AuNPs) and ultrasound waves, resulting in the synthesis of distinct plasmonic-based composites, depending on the sonication time. Several parameters were investigated to explore the production of MoS2/AuNPs composites, including the size and the coating of the AuNPs and the MoS2 bulk/AuNPs ratio. As a proof of concept, we have assessed the surface-enhanced Raman scattering (SERS) sensitivity of these nanocomposites for the biodetection of adenine. Selected samples of 2D MoS2/AuNPs composites sonicated for 30 min were shown to be more sensitive to detecting adenine than the composite components alone (2D MoS2 nanosheets and AuNPs).
palavras-chave
LIQUID-PHASE EXFOLIATION; 2-DIMENSIONAL NANOSHEETS; NANOPARTICLES; SERS; INTERCALATION; SPECTROSCOPY; PARAMETERS
categoria
Chemistry; Materials Science; Physics
autores
de Sousa, BP; Estrada, AC; Trindade, T; Fateixa, S
nossos autores
Ana Cristina Estrada
Investigador Júnior
Sara Fateixa
Bolseiro de pós-Doutoramento
Tito Trindade
Professor CatedráticoProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). A.C.E and S.F. thanks FCT for their research contract funded by National funds (OE), in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19 (DL 57/2016/CP1482/CT0007; DOI 10.54499/DL57/2016/CP1482/CT0007) .