Comparative study of layer-by-layer deposition techniques for polysodium phosphate and polyallylamine hydrochlorideReport as inadecuate




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Nanoscale Research Letters

, 8:539

First Online: 20 December 2013Received: 31 October 2013Accepted: 04 December 2013

Abstract

An inorganic short chain polymer, polysodium phosphate, PSP, together with polyallylamine hydrochloride, PAH, is used to fabricate layer-by-layer LbL films. The thickness, roughness, contact angle, and optical transmittance of these films are studied depending on three parameters: the precursor solution concentrations 10 and 10 M, the number of bilayers deposited 20, 40, 60, 80, and 100 bilayers, and the specific technique used for the LbL fabrication dipping or spraying. In most cases of this experimental study, the roughness of the nanofilms increases with the number of bilayers. This contradicts the basic observations made in standard LbL assemblies where the roughness decreases for thicker coatings. In fact, a wide range of thickness and roughness was achieved by means of adjusting the three parameters mentioned above. For instance, a roughness of 1.23 or 205 nm root mean square was measured for 100 bilayer coatings. Contact angles close to 0 were observed. Moreover, high optical transmittance is also reported, above 90%, for 80 bilayer films fabricated with the 10 M solutions. Therefore, these multilayer structures can be used to obtain transparent superhydrophilic surfaces.

KeywordsLayer-by-layer Dipping and spray deposition Inorganic polymer Hydrophilic film Functionalized surfaces AbbreviationsAFMAtomic force microscope

LbLLayer-by-layer

PAHPolyallylamine hydrochloride

PEIPolyethylenimine

PSPPolysodium phosphate.

Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-8-539 contains supplementary material, which is available to authorized users.

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Author: Cesar Elosua - Diego Lopez-Torres - Miguel Hernaez - Ignacio R Matias - Francisco J Arregui

Source: https://link.springer.com/







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