Agarose-Based Fluorescent Waveguide with Embedded Silica Nanoparticle-Carbon Nanodot Hybrids for pH Sensing

Autor(es)

Amato, Francesco ^[1] ; Prado Soares, Marco Cesar ^{[2, 3]} ; Cabral, Thiago Destri ^{[2, 3]} ; Fujiwara, Eric ^[2] ; de Barros Cordeiro, Cristiano Monteiro ^[3] ; Criado, Alejandro ^[4] ; Prato, Maurizio ^{[5, 1, 4]} ; Bartoli, Julio Roberto ^{[2, 6]}

Afiliação do(s) autor(es)

^[1] Univ Trieste, Dept Chem & Pharmaceut Sci, I-34127 Trieste - Italy

^[2] Univ Estadual Campinas, Sch Mech Engn, BR-13083860 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, Gleb Wataghin Inst Phys, BR-13083859 Campinas, SP - Brazil

^[4] Basque Res & Technol Alliance, Ctr Cooperat Res Biomat, Donostia San Sebastian 20014 - Spain

^[5] Ikerbasque, Basque Fdn Sci, Bilbao 48013 - Spain

^[6] Univ Estadual Campinas, Sch Chem Engn, Dept Mat & Bioproc Engn, Lab Dielect Opt & Nanocomposites Mat, BR-13083852 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED NANO MATERIALS; v. 4, n. 9, p. 9738-9751, SEP 24 2021.
• Citações Web of Science: 0

Resumo

The fabrication of a biodegradable and fluorescent cylindrical waveguide with doped hybrid nanoparticles (silica-carbon nanodots) is reported. The fluorescent hybrids were obtained by coupling amino-functionalized fumed silica nanoparticles with the carboxylic acid surface groups of amorphous carbon nanodots obtained from the thermolysis of citric acid. The hybrid nanoparticles present diameters lower than 10 nm, maximum fluorescence at 465 nm, and excitation-wavelength-dependent behavior. They were occluded into an agarose matrix, providing a low-cost and easily scalable sensor capable of detecting pH variations with maximum sensitivity of 5.61 nm/(pH unit) when excited by a 403 nm UV light-emitting diode (LED). (AU)

• Processo FAPESP: 19/22554-4 - Projeto e fabricação de fibras ópticas não-convencionais para sensoriamento químico
• Beneficiário: Marco César Prado Soares
• Modalidade de apoio: Bolsas no Brasil - Doutorado