Copper–cobalt heterobimetallic ceramic oxide thin film deposition: Synthesis, characterization and application of precursor (original) (raw)
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Copper–cobalt oxide ceramic thin films from single source precursors:
Two heterobimetallic coordination complexes [Co(acac)Cu 2 (bdmap) 2 Cl 3 ]ÁC 7 H 8 (1) and [Co(acac)Cu 2 (bdmap) 2 Cl 3 ]Á3CH 2 Cl 2 (2) [bdmap = 1,3-Bis(dimethylamino)-2-propanol and acac = 2,4-pentanedionate], have been synthesized by simple chemical technique and characterized by their melting points, elemental composition, FT-IR spectroscopy, mass spectrometry and single crystal X-ray analysis. Thermograms of both the precursors indicated their facile decomposition at relatively low temperature of 454°C to give stable residual mixture of Cu and CoO. Both the precursors are utilized for the deposition of Cu-CoO thin films by aerosol-assisted chemical vapor deposition (AACVD) equipment at 450°C on glass substrates that were subsequently characterized for their morphology and composition of the ceramic material. The scanning electron microscopy of copper-cobalt oxide films grown from both the precursors describe highly compact and smooth morphology with homogenously dispersed spherical particles with excellent adhesion properties to the substrates. The EDX analysis shows homogeneous distribution of metallic elements with Cu:Co ratio close to 2:1. Powder X-ray diffraction analysis of the films shows that they are composed of Cu/CoO composite and are crystalline in nature having particle size in the range of 0.3-0.8 lm.
6 ] (2) [dmae = N,N-dimethylaminoethanol, TFA = trifluoroacetic acid and acac = 2,4-pentanedionate] were prepared and tested as precursors for the deposition of mixed metal oxide composite thin films. The complexes were synthesized by reaction of the tetrameric copper(II) complex [Cu(dmae)(TFA)] 4 with M(acac) 2 ÁxH 2 O [M = Ni, x = 2; Co, x = 1] in THF and were characterized by melting point, elemental analysis, FT-IR spectroscopy, TG/DTG and single-crystal X-ray diffraction. The complexes are isomorphous and crystallize in the triclinic centrosymmetric space group P % 1. Aerosol assisted chemical vapour deposition (AACVD) studies carried out on and showed that they are promising precursors for the deposition of thin films of crystalline CuO-NiO and Cu 2 O-CoO composites, respectively. The size, shape, surface morphology, microstructure, chemical composition and crystallinity of the resulting mixed-metal oxide composite thin films were analysed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The analysis proved that the thin films are crystalline, uniform, smooth and tightly adherent to the substrates.
Heterobimetallic copper–barium complexes for deposition of composite oxide thin films
New Journal of Chemistry, 2009
Heterobimetallic molecular precursors [Ba(dmap) Cu 4 (OAc) ÁTHF] (1) and [Ba(dmap) Cu 4 (TFA) ÁTHF] (2) [dmap = N,N-dimethylaminopropanolate, OAc = acetate and TFA = trifluoroacetate] for the deposition of barium-copper composite oxide thin films, were prepared by the interaction of Ba(dmap) 2 with Cu(OAc) 2 for 1 and Cu(TFA) 2 for 2, in THF. Both heterobimetallic complexes were characterized by melting point, elemental analysis, FT-IR spectroscopy, mass spectrometry and single crystal X-ray diffraction. X-Ray crystallography shows that complex 1 crystallizes in the orthorhombic space group P2 1 2 1 2 1 with the cell dimensions a = 11.2621 Å , b = 18.2768(17) Å and c = 24.541(2) Å , while complex 2 crystallizes in the monoclinic space group C2/c with a = 23.9288(14) Å , b = 19.8564(12) Å , c = 25.5925(15) Å and b = 112.4390 1. Thermal gravimetric analysis shows that both complexes 1 and 2 undergo controlled thermal decomposition at 450 1C and 400 1C, respectively, to give mixed metal oxide composite thin films. Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray powder diffraction (XRD) analyses of the thin films suggest the formation of good quality crystalline thin films of BaCuO 2 -CuO composites from both 1 and 2, with average grain sizes of 105 to 175 nm and 110 to 205 nm, respectively.
Single source heterobimetallic precursors for the deposition of Cu–Ti mixed metal oxide thin films
Dalton Transactions, 2008
9 ] (2) were prepared by the interaction of Ti(dmae) 4 [dmae = N,N-dimethylaminoethanolate] with Cu(benzoate) 2 ·2H 2 O for (1) and Cu(2-methylbenzoate) 2 ·2H 2 O for (2), respectively, in dry toluene, for selective deposition of Cu/Ti oxide thin films for possible technological applications. Both the complexes were characterized by melting point, elemental analysis, FT-IR, thermal analysis and single crystal X-ray analysis. Complex (1) crystallizes in the triclinic space group P-1 and complex (2) in the rhombohedral space group R-3. The TGA analysis proves that complexes and undergo facile thermal decomposition at 550 • C to form copper titanium mixed metal oxides. The SEM/EDX and XRD analyses suggest the formation of carbonaceous impurity free good quality thin films of crystalline mixtures of b-Cu 3 TiO 4 and TiO 2 for both and , with average grain sizes of 0.29 and 0.74 lm, respectively. Formation of two different homogenously dispersed oxide phases is also supported by electrical impedance measurements.
Inorganic Chemistry, 2006
4 ] (3) [dmaeH ) N,N-dimethylaminoethanol and acac ) 2,4-pentanedionate] for the deposition of mixed oxide thin films were prepared by the interaction of tetrameric N,N-dimethylaminoethanolato copper(II) chloride, [Cu-(dmae)Cl] 4 (1) with M(acac) 2 ‚xH 2 O, [M ) Co, Ni] in toluene. Both heterobimetallic cage complexes were characterized by melting point, elemental analysis, FT-IR spectroscopy, mass spectrometry, magnetometery, and single-crystal X-ray diffraction. Complexes 2 and 3 are isostructural and crystallize in the monoclinic space group P2 1 /n. A TGA study shows that both complexes undergo controlled thermal decomposition at 450°C to give mixed metal oxides. Solid-state infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and X-ray powder diffraction (XRD) analysis were performed to analyze the chemical composition and surface morphology of the deposited oxide thin films. The results obtained indicate the formation of impurity-free crystalline mixed oxide films with particle sizes ranging from 0.55 to 2.0 µm.
Energy Procedia, 2015
Thin films of copper oxide were prepared by chemical bath deposition (CBD) method on substrates of glasses by Alternate immersions method (AI) at room temperature for 20 second using heated liquid of sodium hydroxide up to 70 and copper thiosulfate complex. The substrates were annealed at different temperatures (200-300-400) in the air; the crystalline structure of prepared samples was studied by using XRD and (SEM) technologies. The results were indicated to; the crystalline structure of prepared films was related to temperature of annealing of copper-oxide (Tenorite), cubic of Cu 2 o (Cuprite). Optical studies showed that the prohibited rang between (1.3-2.4)ev was related to annealing temperature (monoclinic). Therefore, application of solar cells is very promising as a suitable material for conversion of photovoltaic energy with high absorbency solar and low thermal issue. Real and imaginary dielectric constants were calculated (1 and 2). Significant improvement in structure as a follower of annealing temperature required by oxide layer, SEM image showed that porous structure were distinctive materials for the manufacture of gas sensors.
Ceramics and Thick Films : Fabrication and Characterization
2011
Low temperature sintering ceramics, LTCC, copper tellurate, thick films, electrophoretic depostion, EPD There has been an ever-growing demand for miniaturization in the electronic devices while keeping the high function density and low price. The ultimate solution is the low temperature co-firing ceramics (LTCC) technology. Targeting LTCC applications, the fabrication and dielectric properties of Cu3TeO6 thick films were studied in this thesis. The precursors were synthesized by the conventional solid state method. Copper oxide (CuO) and tellurium dioxide (TeO2) powders as starting materials with different stoichiometry were calcined at a series of temperatures. X-ray diffraction analysis of the products attest that CuTe2O5 and Cu3TeO6 were obtained as mono-phasic compounds for the CuO+2TeO2 and 3CuO+TeO2 compositions, respectively. Cu3TeO6 ceramics were well sintered at 865 C, showing a relative density of 93% and shrinkage of 29%. Sintering at higher temperature led to the decompo...