Photocatalytic Nanostructured Self-Assembled Poly(allylamine hydrochloride)/Poly(acrylic acid) Polyelectrolyte Films Containing Titanium Dioxide鈥揋old Nanoparticles for Hydrogen Generation

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• 作者：Nicolle Dal鈥橝cqua ; Francine Ramos Scheffer ; Rosiana Boniatti ; Barbara Virg铆nia Mendon莽a da Silva ; Janaina Viana de Melo ; Janaina da Silva Crespo ; Marcelo Giovanela ; Marcelo Barbalho Pereira ; Daniel Eduardo Weibel ; Giovanna Machado
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 7, 2013
• 年：2013
• 卷：117
• 期：44
• 页码：23235-23243
• 全文大小：546K
• 年卷期：v.117,no.44(November 7, 2013)
• ISSN：1932-7455

文摘

In this study, we developed a facile layer-by-layer (LbL) method of incorporating gold (Au) and titanium dioxide (TiO₂) nanoparticles (NPs) into self-assembled photocatalytic films (SAPFs). The resulting SAPFs were then systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), UV鈥搗is spectrophotometry, profilometry, and atomic force microscopy (AFM). The results revealed that the SAPFs incorporated TiO₂ and Au NPs with sizes of 21.2 卤 0.30 and 12.5 卤 0.05 nm, respectively. Moreover, the SAPFs with 40, 60, 80, and 100 layers exhibited thicknesses of 410, 472, 917, and 945 nm, respectively. The hydrogen produced by the SAPFs increased with increasing UV irradiation time in a linear relationship. Hydrogen was also produced within the bulk of the polymer/TiO₂鈥揂u NP assemblies because water hydrates the network, allowing for facile hydrogen production in the bulk under irradiation. The present approach represents a significant advance over traditional nanostructured catalysts, for which the highest possible surface area is desired to maximize photocatalytic activity.