Formation of Copper Based Nanoparticles Embedded in a Relatively Thick Polyimide Film by Thermal Curing in Reducing Atmosphere

Yoon, Junro; Choi, Dong‐Joo; Oh, Do-Hyun; Kim, T W; Kim, Young‐Ho

doi:10.1166/jnn.2008.1100

Cited by 5 publications

(4 citation statements)

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“…The nanoparticles have difficulty diffusing or aggregating as they become bigger. The phase of the nanoparticles depends on the curing atmosphere [30,34]. Cu 2 O nanoparticles are formed during post-heat treatment in an oxidizing atmosphere since Cu nanoparticles reacted with oxygen ions diffusing from the atmosphere, which matched well with our previous results [31].…”

Section: Resultssupporting

confidence: 88%

“…In this method, polyamic acid (PAA) is spin-coated onto a metal film, and the metal film starts to be dissolved into PAA, forming a PAAmetal complex. During the imidization of PAA to PI, metal ions are rejected from the PAA-metal complex, accompanying nanoparticle formation [27][28][29][30][31][32][33][34][35]. Cu or Cu 2 O nanoparticles can be fabricated at high density in various PI films using the above method [27,29,35].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

et al. 2014

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Nanocomposites consisting of Cu or Cu2O nanoparticles in various polyimide (PI) films were successfully prepared using polyamic acid (PAA) and Cu powders. Cu powders were dissolved into PAA solutions, and the solutions were spin-coated onto the substrates. Cu or Cu2O nanoparticles were formed in PI film by curing in a reducing or inert atmosphere, respectively. The Cu nanoparticles were transformed to Cu2O nanoparticles by post-heat treatment in an oxidizing atmosphere after curing in a reducing atmosphere. Transmission electron microscopy showed that uniform, round Cu2O nanoparticles 6.0 nm in diameter were dispersed in the PI film by post-heat treatment. The addition of Cu2O nanoparticles in the 4,4'-(hexafluoroisopropylidene)diphthalic anhydride-4,4'-oxydianiline (6FDA-ODA) PI film enhanced the refractive index of the 6FDA-ODA PI film from 1.60 to 1.72 at 633 nm, and the transparency of the nanocomposite film was about 70-90% in the visible region and remained around 90% beyond 550 nm.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

et al. 2014

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“…20 Our XRD result is similar to our previous result. 21 During the imidization process, the Cu ions rejected from Cu-PAA complex and formed aggregation as the shape of nano-size particles. 22 The post heattreatment in an oxidizing atmosphere transformed metallic Cu nanoparticles to two different metal-oxide phases depending on the temperature of the post heat-treatment.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Fabrication of CuO and Cu₂O Nanoparticles in a Thick Polyimide Film by Post Heat Treatment in a Controlled-Atmosphere

Yoon

Choi²,

Kim³

2011

j nanosci nanotechnol

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We investigated the formation of CuO or Cu2O nanoparticles in the thick polyimide films by oxidizing Cu nanoparticles at various temperatures during the post heat-treatment. Cu nanoparticles of 4-5 nm in diameter were initially formed in the polyimide film by the reaction between a Cu film and a polyimide precursor, polyamic acid, and a following thermal curing in a reducing atmosphere. After the subsequent post heat-treatments in oxidizing atmospheres, X-ray diffraction patterns revealed that initial metallic Cu nanoparticles were transformed to Cu2O or CuO nanoparticles depending on the temperature during the post heat-treatment. Cu nanoparticles were oxidized to Cu2O during the post heat-treatment at low temperature while Cu nanoparticles were oxidized to CuO during the post heat-treatment at high temperature. Cross-sectional TEM studies showed that about 4.7 nm sized Cu2O nanoparticles or 4.7-5.2 nm sized CuO nanoparticles were fabricated in a thick polyimide film depending on the post heat-treatment condition. In the optical absorption measurements, the absorption peak from surface plasmon resonance of Cu nanoparticles disappeared during the post heat-treatment in an oxidizing atmosphere.

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“…These peaks originated from the Cu nanoparticles formed in the PI film during the curing process in a reducing atmosphere, and the XRD pattern matched well with our previous results. 18 After curing in a reducing atmosphere, only the metallic Cu (111) and Cu (200) peaks were observed. The peaks related to the Cu oxide did not appear because hydrogen diffused into the PI and reduced the particles to a Cu phase.…”

Section: X-ray Diffraction Measurement Resultsmentioning

confidence: 98%

Fabrication of Copper Nanoparticles in a Thick Polyimide Film Cured by Rapid Thermal Annealing

Choi

Choi²,

Ahn³

et al. 2012

j. nanosci. nanotech.

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We investigated the imidization of a polyimide (PI) and the formation of Cu nanoparticles in a PI film by curinga precursor of PI (polyamic acid (PAA) dissolved in n-methyl-2-pyrrolidinone) in a reducing atmosphere in the rapid thermal annealing (RTA) system. A Cu film was deposited onto the SiO2/Si substrate, and the PAA was spin-coated onto the Cu film. After the PAA reacted with the Cu film, soft-baking was performed to evaporate the solvent. Finally, the PAA was imidized to PI at 450 degrees C by curing in a reducing atmosphere with the RTA. Fourier transform infrared spectroscopy showed that the PAA was successfully imidized by the RTA. X-ray diffraction patterns revealed that Cu nanoparticles formed by RTA curing at 450 degrees C for 5 minutes in a reducing atmosphere, and transmission electron microscopy showed that Cu nanoparticles about 6.5 nm in size were uniformly dispersed in the PI film. Curing by RTA is an attractive method because it takes only a few minutes.

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Formation of Copper Based Nanoparticles Embedded in a Relatively Thick Polyimide Film by Thermal Curing in Reducing Atmosphere

Cited by 5 publications

References 0 publications

Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

Fabrication of CuO and Cu₂O Nanoparticles in a Thick Polyimide Film by Post Heat Treatment in a Controlled-Atmosphere

Fabrication of Copper Nanoparticles in a Thick Polyimide Film Cured by Rapid Thermal Annealing

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Formation of Copper Based Nanoparticles Embedded in a Relatively Thick Polyimide Film by Thermal Curing in Reducing Atmosphere

Cited by 5 publications

References 0 publications

Synthesis of Cu or Cu2O-polyimide nanocomposites using Cu powders and their optical properties

Synthesis of Cu or Cu2O-polyimide nanocomposites using Cu powders and their optical properties

Fabrication of CuO and Cu2O Nanoparticles in a Thick Polyimide Film by Post Heat Treatment in a Controlled-Atmosphere

Fabrication of Copper Nanoparticles in a Thick Polyimide Film Cured by Rapid Thermal Annealing

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Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

Synthesis of Cu or Cu₂O-polyimide nanocomposites using Cu powders and their optical properties

Fabrication of CuO and Cu₂O Nanoparticles in a Thick Polyimide Film by Post Heat Treatment in a Controlled-Atmosphere