TY - JOUR
T1 - Gasochromic effect of palladium doped peroxopolytungstic acid films prepared by the sol-gel route
AU - Orel, B.
AU - Groselj, N.
AU - Krasovec, U. O.
AU - Gabrscek, M.
AU - Bukovec, P.
AU - Reisfeld, R. R.
PY - 1998
Y1 - 1998
N2 - Gasochromic palladium doped peroxopolytungstic acid (Pd:P-PTA) films have been prepared using dip-coating deposition from peroxopolytungstic acid (P-PTA) sols into which PdCl2 was added in molar ratios Pd:W = 1:125, 1:100, 1:53, and 1:40. These films exhibit reversible colouring/bleaching changes when exposed to hydrogen or hydrogen/argon mixture (4%) and air, alternatively. Gasochromically coloured and bleached films were characterised using in-situ Fourier transform infrared (FT-IR) spectroscopy. The vibrational modes of as-deposited, coloured and bleached films were assigned and the polaron absorption, which characterises the IR spectra of coloured films, was detected. Colouring/bleaching kinetics of films exposed to H2 and H2/Ar mixture as a function of the concentration of the catalyst and temperature of heat-treatment is reported. Proton (σpr) and electronic (σel) conductivities determined from impedance spectra revealed an increase in σel from 10-5 S cm-1 in bleached state, to 10-3 S cm-1 in coloured state, while σpr remained constant (10-2 S cm-1).
AB - Gasochromic palladium doped peroxopolytungstic acid (Pd:P-PTA) films have been prepared using dip-coating deposition from peroxopolytungstic acid (P-PTA) sols into which PdCl2 was added in molar ratios Pd:W = 1:125, 1:100, 1:53, and 1:40. These films exhibit reversible colouring/bleaching changes when exposed to hydrogen or hydrogen/argon mixture (4%) and air, alternatively. Gasochromically coloured and bleached films were characterised using in-situ Fourier transform infrared (FT-IR) spectroscopy. The vibrational modes of as-deposited, coloured and bleached films were assigned and the polaron absorption, which characterises the IR spectra of coloured films, was detected. Colouring/bleaching kinetics of films exposed to H2 and H2/Ar mixture as a function of the concentration of the catalyst and temperature of heat-treatment is reported. Proton (σpr) and electronic (σel) conductivities determined from impedance spectra revealed an increase in σel from 10-5 S cm-1 in bleached state, to 10-3 S cm-1 in coloured state, while σpr remained constant (10-2 S cm-1).
UR - http://www.scopus.com/inward/record.url?scp=0032131104&partnerID=8YFLogxK
U2 - 10.1016/s0925-4005(98)00241-x
DO - 10.1016/s0925-4005(98)00241-x
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AN - SCOPUS:0032131104
SN - 0925-4005
VL - 50 B50
SP - 234
EP - 245
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
IS - 3
ER -