Electrothermal silver nanowire thin films for In-Situ observation of thermally-driven chemical processes

Autor(es)

Martinez, Eduardo D. ^[1] ; Garcia Flores, Ali F. ^[2] ; Pastoriza, Hernan ^[3] ; Urbano, Ricardo R. ^[1] ; Rettori, Carlos ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys IFGW, BR-13083859 Campinas, SP - Brazil

^[2] Fed Univ ABC UFABC, CCNH, BR-09210580 Santo Andre, SP - Brazil

^[3] Consejo Nacl Invest Cient & Tecn, Comis Nacl Energia Atom, Ctr Atom Bariloche, Div Bajas Temp, Av Bustillo 9500, R8402AGP, San Carlos De Bariloche, Rio Negro - Argentina

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 259, p. 475-483, APR 15 2018.
• Citações Web of Science: 4

Resumo

We develop a novel device comprised of high optical transmittance thin films containing silver nanowires (AgNWs) in poly(methyl methacrylate) (PMMA) acting as heating elements. The electrothermal control of the AgNWs network allows us to externally trigger and tune the temperature conditions required to run chemical reactions and physicochemical processes. The device was successfully applied for the spectroscopic in-situ observation of three different model reactions: i) the thermal equilibrium of a CoCl2/HCl/H2O complex, ii) the reversible macromolecular phase transition of a pNIPAM solution, and iii) the nucleation and growth of gold nanoparticles (AuNPs). In the first case, the color of the CO2+ complex was reversibly switched from pink to blue when changing the thermal equilibrium condition. In the second one, the optical transmittance of an aqueous solution of carboxylic-terminated pNIPAM polymer was cycled from high to low as the temperature of the solution was below or above the lower critical solubility temperature (LCST) respectively. Finally, the electrothermal control on the device was applied to the study of the nucleation and growth of AuNPs in an organic solution of AuCl3 containing oleylamine acting as both the reducer and the stabilizing agent. The versatility of the electrothermal device provides an easy way to undertake thermally controlled processes and develop optical elements such as smart windows and lab-on-a-chip devices. The AgNWs-PMMA nanocomposite was also applied successfully as an electrothermal ink on the external side walls of a test tube. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 15/21290-2 - EMU concedido no processo 12/04870-7: analisador de distribuição de tamanho de partículas por sistema de espalhamento dinâmico de luz, com potencial zeta e peso molecular, Horiba SZ-100Z
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 15/23882-4 - Intensificaçao da eficiença plasmónica da upconversion em nanocristales dopados con terras rarass
• Beneficiário: Eduardo David Martínez
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/04870-7 - Estudos de novos materiais complexos e avançados
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 11/19924-2 - Estudo e desenvolvimento de novos materiais avançados: eletrônicos, magnéticos e nanoestruturados: uma abordagem interdisciplinar
• Beneficiário: Carlos Rettori
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/05903-6 - Ressonância magnética nuclear de novos materiais complexos e avançados em física da matéria condensada
• Beneficiário: Ricardo Rodrigues Urbano
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 15/21289-4 - EMU concedido no processo 12/04870-7: difratômetro de raios-X de pó de bancada, D2 PHASER desktop - Bruker
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários