TY - JOUR
T1 - Gasochromic behavior of sol-gel derived Pd doped peroxopolytungstic acid (W-PTA) nano-composite films
AU - Orel, B.
AU - Opara Krašovec, U.
AU - Grošelj, N.
AU - Kosec, M.
AU - Dražič, G.
AU - Reisfeld, R.
PY - 1999
Y1 - 1999
N2 - The behavior of sol-gel prepared thin films exhibiting a gasochromic effect; i.e., a reversibly change in colour from transparent when in air to blue when in H2, has been studied. The films were prepared from a Pd (PdCl2) doped peroxopolytungstic acid sol using a dip-coating technique. Transmission electron microscopy together with selected area electron diffractrometry revealed that the films consist of monoclinic and hexagonal nanocrystalline grains (approximately 2-5 nm) embedded in an amorphous phase. This amorphous hydrated phase was established using Infrared (IR) and Raman spectroscopy. Colouring/bleaching changes of Pd doped W-PTA films observed using in-situ UV-Vis spectroscopy are described in terms of Pd concentration, and the number of reducing/oxidizing cycles. The rate of colouring/bleaching is greater for films confining a higher concentration of Pd but the change in the optical density does not increase, i.e., shows saturation.
AB - The behavior of sol-gel prepared thin films exhibiting a gasochromic effect; i.e., a reversibly change in colour from transparent when in air to blue when in H2, has been studied. The films were prepared from a Pd (PdCl2) doped peroxopolytungstic acid sol using a dip-coating technique. Transmission electron microscopy together with selected area electron diffractrometry revealed that the films consist of monoclinic and hexagonal nanocrystalline grains (approximately 2-5 nm) embedded in an amorphous phase. This amorphous hydrated phase was established using Infrared (IR) and Raman spectroscopy. Colouring/bleaching changes of Pd doped W-PTA films observed using in-situ UV-Vis spectroscopy are described in terms of Pd concentration, and the number of reducing/oxidizing cycles. The rate of colouring/bleaching is greater for films confining a higher concentration of Pd but the change in the optical density does not increase, i.e., shows saturation.
UR - http://www.scopus.com/inward/record.url?scp=0004472060&partnerID=8YFLogxK
U2 - 10.1023/A:1008773614398
DO - 10.1023/A:1008773614398
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AN - SCOPUS:0004472060
SN - 0928-0707
VL - 14
SP - 291
EP - 308
JO - Journal of Sol-Gel Science and Technology
JF - Journal of Sol-Gel Science and Technology
IS - 3
ER -