| Full text | |
| Author(s): |
Martinez, Eduardo D.
[1]
;
Garcia Flores, Ali F.
[2]
;
Pastoriza, Hernan
[3]
;
Urbano, Ricardo R.
[1]
;
Rettori, Carlos
[1, 2]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | SENSORS AND ACTUATORS B-CHEMICAL; v. 259, p. 475-483, APR 15 2018. |
| Web of Science Citations: | 4 |
| 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 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) | |
| FAPESP's process: | 12/05903-6 - Nuclear magnetic resonance of novel complex and advanced materials in condensed matter physics |
| Grantee: | Ricardo Rodrigues Urbano |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach |
| Grantee: | Carlos Rettori |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/23882-4 - PLASMONIC EFICIENCY INTENSIFICATION OF THE UPCONVESION IN NANOCRYSTAIS DOPED WITH RARE EARTHS. |
| Grantee: | Eduardo David Martínez |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 12/04870-7 - Studies of novel complex and advanced materials |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/21289-4 - Multi-User Equipment in grant 12/04870-7 - desktop X-ray powder diffractometer |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 15/21290-2 - Multi-User Equipment in grant 12/04870-7 - dynamic light scattering analyser Horiba SZ-100Z |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Multi-user Equipment Program |