Large Area, Nanoparticulate Metal Oxide Coatings for Consumer Nanotechnologies

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Large area coatings containing nanoparticulate metal oxides dispersed in polymers are manufactured at high speed (up to 200 m2 /min.) by curtain- or cascade coating on flexible substrates near room temperature. Simultaneously coated multilayers, which may contain different metal oxides, show interesting new properties for industrial applications. Thick (40 $m) coatings with rare-earth doped aluminum oxide nanoparticles have been commercialized for waterfast ink-jet media which are dry to touch after printing, show photo-parity and are very stable towards water, light and environment if appropriate inks are used. Strong capillary forces due to nanoporosity allow instant ink-absorption. Experimental techniques used to develop these materials and results related to imaging parameters are discussed. Thin layers (1-10 $m) of nanoparticulate, nanoporous TiO2 and LiMn2O4, dispersed in non-electroactive polymers such as polyethylene glycols, can be used as electrodes for rechargeable Li-ion batteries with very fast charge-discharge cycles and high power performance. The excellent ion-conducting properties of unsintered, nanoparticulate coatings of these metal oxides were unexpected and allow applications of temperature sensitive substrates and organic addenda. By coating very thin, almost or totally polymer-free layers of highly-porous, monodisperse aluminum-oxides with minimum particle size, display devices with improved optical efficiency were prepared. These layers have a low refractive index thus allowing for higher intensities of light emitted by organic electro-luminescers in OLED’s and PLED’s. This property is useful for mobile devices as phones and PDA’s. A hitherto unknown, photo-catalytic chemical reaction of the classical green emitter tris-(8-hydroxychinolino)-aluminum (Alq3) has been discovered in coatings of such optically efficient devices after exposing them to daylight in air. An efficient blue-emitting species of Alq3 with another stereochemical structure was directly formed within these layers at room temperature by photolysis in ambient atmosphere. Interesting new applications of specially designed, large-area coated and transparent nanostructured matrices on flexible substrates for optical gas sensors are discussed in more detail in this paper.

Info:

Periodical:

Solid State Phenomena (Volumes 121-123)

Edited by:

Chunli BAI, Sishen XIE, Xing ZHU

Pages:

1193-1198

DOI:

10.4028/www.scientific.net/SSP.121-123.1193

Citation:

R. Steiger et al., "Large Area, Nanoparticulate Metal Oxide Coatings for Consumer Nanotechnologies", Solid State Phenomena, Vols. 121-123, pp. 1193-1198, 2007

Online since:

March 2007

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Price:

$35.00

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[2] Patents WO02074039, EP 1244114 (A1) Figure 5. Effect of the Fe-Pc concentration on the a) sensor response (∆∆∆∆A659=A0-Ax; A0, absorbance before NO2 exposure; Ax, absorbance on exposure to 200 ppb NO2) and b) the absorbance of the optode in absence of NO2. AlOOH membrane, relative humidity 50% and flow-rate 200 mL/min.

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[1] 0.

[1] 5.

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1% CO2.

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75% CO2 1% CO2 2% CO2 3% CO2 4% CO2 6% CO2 8% CO2 10% CO2 0% CO2 (a) D+H- + Q+OH- ⋅⋅⋅⋅xH2O D-Q+ ⋅⋅⋅⋅(x+1)H2O D-H+ + Q+HCO3 - ⋅⋅⋅⋅xH2O CO2 CO2 DH = αααα-Naphtholphthalein QOH = Tetraoctylammonium hydroxide.

DOI: 10.1787/308211225866

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[1] 0.

[1] 5.

[2] 0.

[2] 5 0 2000 4000 6000 Time (s) A652.

1% CO2.

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75% CO2 1% CO2 2% CO2 3% CO2 4% CO2 6% CO2 8% CO2 10% CO2 0% CO2 (a).

DOI: 10.1787/308211225866

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[1] 0.

[1] 5.

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75% CO2 1% CO2 2% CO2 3% CO2 4% CO2 6% CO2 8% CO2 10% CO2 0% CO2.

DOI: 10.1787/308211225866

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75% CO2 1% CO2 2% CO2 3% CO2 4% CO2 6% CO2 8% CO2 10% CO2 0% CO2 (a) D+H- + Q+OH- ⋅⋅⋅⋅xH2O D-Q+ ⋅⋅⋅⋅(x+1)H2O D-H+ + Q+HCO3 - ⋅⋅⋅⋅xH2O CO2 CO2 DH = αααα-Naphtholphthalein QOH = Tetraoctylammonium hydroxide D+H- + Q+OH- ⋅⋅⋅⋅xH2O D-Q+ ⋅⋅⋅⋅(x+1)H2O D-H+ + Q+HCO3 - ⋅⋅⋅⋅xH2O CO2 CO2 D+H- + Q+OH- ⋅⋅⋅⋅xH2O D-Q+ ⋅⋅⋅⋅(x+1)H2O D-H+ + Q+HCO3 - ⋅⋅⋅⋅xH2O CO2 CO2 DH = αααα-Naphtholphthalein QOH = Tetraoctylammonium hydroxide.

DOI: 10.1016/0021-9614(84)90005-3

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