Dual Band Electrochromic Devices Based on Nb-Doped TiO2Nanocrystalline Electrodes.
The reliable exploitation of localized surface plasmon resonance in transparent conductive oxides is being pursued to push the developement of an emerging class of advanced dynamic windows, which offer the opportunity to selectively and dynamically control the intensity of the incoming thermal radiation without affecting visible transparency. In this view, Nb-doped TiO2colloidal nanocrystals are particularly promising, as they have a wide band gap and their plasmonic features can be finely tailored across the near-infrared region by varying the concentration of dopants. Four batches of Nb-doped TiO2nanocrystals with different doping levels (from 0% to 15% of niobium content) have been used here to prepare highly transparent mesoporous electrodes for near-infrared selective electrochromic devices, capable of dynamically modulating the intensity of the transmitted radiation upon the application of a relatively small bias voltage. An engineered dual band electrochromic device (made of 10%-Nb-doped TiO2nanocrystals) has been eventually fabricated. It was shown to provide two complementary spectroelectrochemical responses, which can be independently controlled through the intensity of the applied potential: a large variation of the optical transmittance in the near-infrared region (by the intensification of the localized surface plasmon scattering) was achievable in the 0-3 V voltage window, reaching values greater than 64% in the spectral range from 800 to 2000 nm, whereas the visible absorption could also be intensively varied at higher potentials (from 3 to 4 V), driven by Li intercalation into the TiO2anatase lattice.
Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia , Via Barsanti 14, 73010, Arnesano (Lecce), Italy.
Mariam
M
Barawi
Nanochemistry Department, Istituto Italiano di Tecnologia , Via Morego 30, 16163 Genova, Italy.
Luca
0000-0002-1514-6358
L
De Trizio
Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia , Via Barsanti 14, 73010, Arnesano (Lecce), Italy.
Roberto
R
Giannuzzi
Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia , Via Barsanti 14, 73010, Arnesano (Lecce), Italy.
Giulia
G
Veramonti
Nanochemistry Department, Istituto Italiano di Tecnologia , Via Morego 30, 16163 Genova, Italy.
Liberato
0000-0003-4386-7985
L
Manna
Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia , Via Barsanti 14, 73010, Arnesano (Lecce), Italy.
Michele
0000-0002-6903-2954
M
Manca
Nb-doped TiO2; colloidal nanocrystals; dual band; electrochromic devices; localized surface plasmon resonance; near-infrared radiation