Generation and sintering characteristics of silver–copper (II) oxide composite powders made by spray pyrolysis

Sreedhar

Journal of Nanotechnology

et al. 2011

Silver-copper-oxide thin films were formed by RF magnetron sputtering technique using Ag80Cu20target at various oxygen partial pressures in the range 5 × 10−3–8 ×10−2 Pa and substrate temperatures in the range 303–523 K. The effect of oxygen partial pressure and substrate temperature on the structure and surface morphology and electrical and optical properties of the films were studied. The Ag-Cu-O films formed at room temperature (303 K) and at low oxygen partial pressure of 5 × 10−3 Pa were mixed phase of Ag2Cu2O3and Ag, while those deposited at 2 × 10−2 Pa were composed of Ag2Cu2O4and Ag2Cu2O3phases. The crystallinity of the films formed at oxygen partial pressure of 2 × 10−2Pa increased with the increase of substrate temperature from 303 to 423 K. Further increase of substrate temperature to 523 K, the films were decomposed in to Ag2O and Ag phases. The electrical resistivity of the films decreased from 0.8 Ωcm with the increase of substrate temperature from 303 to 473 K due to improvement in the crystallinity of the phase. The optical band gap of the Ag-Cu-O films increased from 1.47 to 1.83 eV with the increase of substrate temperature from 303 to 473 K.

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Process-Parameter-Dependent Structural, Electrical, and Optical Properties of Reactive Magnetron Sputtered Ag-Cu-O Films

Sreedhar

Journal of Nanotechnology

et al. 2011

“…In ame spray synthesis, particles are formed via a gas-to-particle conversion mechanism. [319][320][321][322][323] Conventional ame spray synthesis has been applied to synthesize oxide nanoparticles in an ambient air environment. To synthesize metal particles, the gas mixture from ame reactions could be altered from CO 2 /H 2 O (oxidizing conditions, traditional set-up) to CO/H 2 /H 2 O (reducing conditions).…”

Section: Nickel (Ni) Nanostructuresmentioning

confidence: 99%

Carbothermal synthesis of metal-functionalized nanostructures for energy and environmental applications

Shen

2015

J. Mater. Chem. A

226

International Journal of Chemical Engineering

“…Also, the average particle size was found to increase with Ag content. Majumdar et al [18] reported that the morphology of Ag-CuO particles was distinct that the silver in these particles was not encased in a metal oxide matrix, though the silver filled the voids of porous copper II oxide shell.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Synthesis and Structural Investigations of Ag‐Added BaTiO₃‐CuO Mixed Oxide for CO₂ Gas Sensing

El-Sayed

Ismail

Yakout

2011

Compositions having the general formula BaTiO 3 -CuO + x wt% Ag, where x = 0, 1, 1.5, and 2 have been prepared by solid state ceramic processing and sintered at 500 and 700• C for 5 h. Thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), infrared absorption spectra (IR), and scanning electron microscopy (SEM) were used to characterize the obtained sensor pellets. It was found that no solid state reaction took place between BaTiO 3 and CuO during sintering process. The sensitivity of the prepared sensors to CO 2 gas increases with increasing sintering temperature and Ag content. The correlation between Ag content at different sintering temperature and structure characterization is discussed.