Room temperature inorganic polycondensation of oxide (Cu2O and ZnO) nanoparticles and thin films preparation by the dip-coating technique

Abstract

Oxide thin solid films were prepared by dip-coating into colloidal dispersions of oxide nanoparticles stabilized at room temperature without the use of chelating or complex organic dispersing agents. Crystalline oxide nanoparticles were obtained by inorganic polycondensation and characterized by X-ray diffraction and field emission gun scanning electron microscopy. Water and ethanol synthesis and solution stabilization of oxide nanoparticle method was optimized to prepare two different structural and compositional materials, namely Cu 2 O and ZnO. The influence of hydrodynamic parameters over the particle shape and size is discussed. Spherical and rod shape nanoparticles were formed for Cu 2 O and ZnO, respectively. Isoelectric point values of 7.5 and 8.2 were determined for cuprous and zinc oxides, respectively, after zeta potential measurements. A shear thinning and thixotropic behavior was observed in both colloidal sols after peptization at pH~6 with dilute nitric acid. Every colloidal dispersion stabilized in a low cost and environmentally friendly azeotrope solution composed of 96 vol.% of ethanol with water was used for the thin film preparation by the dip-coating technique. Optical properties of the light absorber cuprous oxide and transparent zinc oxide thin solid films were characterized by means of transmittance and reflectance measurements (300-1100 nm).

Cu2MoS4 Nanotubes as a Cathode Material for Rechargeable Magnesium‐ion Battery

“…Cu 2 O nanocube was first prepared following the process described elsewhere. [20] Obtained Cu 2 O nanocubes are homogeneous in morphology with an average size of 40-60 nm as revealed by FE-SEM analysis ( Figure S1). Powder XRD analysis shows the characteristic patterns of cubic phase (Figure 1c).…”

“…The Cu 2 MoS 4 nanotube having square‐cross section was synthesized via a one‐pot hydrothermal process using Cu 2 O nanocubes as a sacrificial template. Cu 2 O nanocube was first prepared following the process described elsewhere . Obtained Cu 2 O nanocubes are homogeneous in morphology with an average size of 40–60 nm as revealed by FE‐SEM analysis (Figure S1).…”

Heterojunction p-Cu2O/ZnO-n solar cell fabricated by spark plasma sintering

“…We have recently optimized a low-cost preparation process of crystalline oxide nanopowders that is applicable to a wide variety of structures and stoichiometries, including Cu 2 O and ZnO materials [14]. Once dispersed in colloidal suspensions, the oxides can be integrated in thinfilm solar cells.…”

Functionalized superhydrophobic coatings with micro-/nanostructured ZnO particles in a sol–gel matrix

“…Zinc oxide (ZnO) is a material of choice to prepare particles with multiscale structuration from micrometer to nanometer sizes [5][6][7]. Morphology-controlled ZnO nanoparticles preparation methods involve hydrothermal synthesis [7,8], low-temperature precipitation [6,9,10], chemical vapor growth [11], sputtering [12], electrophoretic deposition [13] and sol-gel [14] methods. A large list about superhydrophobic surfaces preparation has been recently proposed by Zhang et al in their review [15].…”

“…The four-step protocol has been set up as follows. First, ZnO micro-/nanoparticles were synthesized by inorganic polycondensation based on works of Salek et al [9] or Sun et al [10] using two types of alkaline solutions. The influence of the alkaline solution nature is related to the ionic radius of the element (r(Li ? )…”