Comparative study of layer-by-layer deposition techniques for poly(sodium phosphate) and poly(allylamine hydrochloride)

Nanoscale Research Letters
Cesar ElosuaF J Arregui

Abstract

An inorganic short chain polymer, poly(sodium phosphate), PSP, together with poly(allylamine 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 (10-3 and 10-4 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 10-4 M solutions. Therefore, these multilayer structures can be used to obtain transparent superhydrophilic surfaces.

References

Jul 27, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·A IzquierdoG Decher
Nov 16, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Mikko SalomäkiJouko Kankare
May 26, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Javier BravoMichael F Rubner
Jul 10, 2012·Applied Optics·Ignacio Del VillarIgnacio R Matias
Oct 24, 2013·Nanoscale Research Letters·Pedro Jose RiveroFrancisco Javier Arregui

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Citations

Mar 13, 2018·Small·Alimohammad AnbariJing Fan
Apr 25, 2019·Nano Convergence·Melanie A Fuller, Ingo Köper
Dec 17, 2018·Carbohydrate Polymers·Miryam Criado-GonzalezRebeca Hernández
Jul 3, 2021·Biosensors·Nerea De AchaIgnacio R Matías
Mar 20, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Paula P CamposLarisa Florea
Apr 13, 2019·ACS Applied Materials & Interfaces·Simona BettiniLudovico Valli

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