Nanoscale precipitation coating: the deposition of inorganic films through step-by-step spray-assembly.
Thin films and surface coatings play an important role in basic and applied research. Here we report on a new, versatile, and simple method ("precipitation coating") for the preparation of inorganic films, based on the alternate spraying of complementary inorganic salt solutions against a receiving surface on which the inorganic deposit forms. The method applies whenever the solubility of the deposited material is smaller than that of the salts in the solutions of the reactants. The film thickness is controlled from nanometers to hundreds of micrometers simply by varying the number of spraying steps; 200 spray cycles, corresponding to less than 15 min deposition time, yield films with thicknesses exceeding one micrometer and reaching tens of micrometers in some cases. The new solution-based process is also compatible with conventional layer-by-layer assembly and permits the fabrication of multimaterial sandwich-like coatings.
Popa
Gabriela
G
Centre National de la Recherche Scientifique, Institut Charles Sadron, UPR 22, 23 rue Loess, 67083 Strasbourg, France.
Boulmedais
Fouzia
F
Zhao
Peng
P
Hemmerlé
Joseph
J
Vidal
Loïc
L
Mathieu
Eric
E
Félix
Olivier
O
Schaaf
Pierre
P
Decher
Gero
G
Voegel
Jean-Claude
JC
D002124:Calcium Fluoride / Q000737:chemistry; D002129:Calcium Oxalate / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry; D011232:Chemical Precipitation; D007287:Inorganic Chemicals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D016062:Porosity
D002130:Calcium Phosphates; D007287:Inorganic Chemicals; D002129:Calcium Oxalate; C020243:calcium phosphate; D002124:Calcium Fluoride