Remarkable ability to modulate light transmittance and block heat in the bleached state combined in one electrochromic material: highly crystalline polyaniline

0488660 - ÚMCH 2019 RIV US eng J - Článek v odborném periodiku
Gospodinova, Natalia - Skorokhoda, Taras - Lobaz, Volodymyr
Remarkable ability to modulate light transmittance and block heat in the bleached state combined in one electrochromic material: highly crystalline polyaniline.
Macromolecules. Roč. 51, č. 6 (2018), s. 2227-2231. ISSN 0024-9297. E-ISSN 1520-5835
Grant CEP: GA ČR(CZ) GA15-14791S
Grant ostatní: OPPK(XE) CZ.2.16/3.1.00/21545
Program: OPPK
Institucionální podpora: RVO:61389013
Klíčová slova: electrochromic * chain ordering * conducting polymers
Obor OECD: Physical chemistry
Impakt faktor: 5.997, rok: 2018

It is revealed that chain ordering strongly affects optical and electrochromic properties of polyaniline. Polyaniline film with 70% crystalline phase combines the remarkable ability to modulate the light transmittance (coloration efficiency of 150 cm2/C with a contrast ratio approaching 10 at λ = 633 nm) with an unprecedented “bright-cool” bleached state, where the polymer is highly transparent to light but has low transmittance for the most intense near-infrared irradiation. Compared to the recently developed dual-band electrochromic materials in which modulation of the near-infrared absorption is realized through plasmonic electrochromism of WO3–x nanoparticles, the highly crystalline polyaniline film demonstrates in the “bright-cool” regime a 10 times lower transmittance at 900 nm (1.6 vs 16%) with the same level (≈60%) of transmittance in the visible region. The coloration efficiency found here is almost 3-fold higher than commonly communicated for polyaniline.
Trvalý link: http://hdl.handle.net/11104/0283377