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Sensors and actuators. B, Chemical v.259, 2018년, pp.475 - 483   SCI SCIE SCOPUS
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Electrothermal silver nanowire thin films for In-Situ observation of thermally-driven chemical processes

Martínez, Eduardo D. (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil ) ; García Flores, Alí (CCNH, Federal University of ABC (UFABC), 09210-580, Santo André, SP, Brazil ) ; F. (División Bajas Temperaturas, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, CONICET, Av Bustillo 9500, S.C. Bariloche, R8402AGP, Río Negro, Argentina ) ; Pastoriza, Hernán (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil ) ; Urbano, Ricardo R. (“Gleb Wataghin” Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil ) ; Rettori, Carlos ;
  • 초록  

    Abstract 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 CoCl 2 /HCl/H 2 O 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 Co 2+ 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 AuCl 3 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. Highlights Silver nanowires/PMMA nanocomposites for thin film semitransparent conductors. Electrical external control of the film temperature. Electrothermal device for studies on temperature-driven physicochemical processes in solutions and colloids. Transparent reactor with external temperature control for in-situ synthesis of metallic nanoparticles. Silver nanowires/PMMA nanocomposite ink for direct application as heater elements on different geometries and materials. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Silver nanowires .   Nanocomposites .   Electrothermal device .   Transparent conductors .   Gold nanoparticles .   pNIPAM.  

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