Study and Optimization of Self‐Assembled Polymeric Multilayer Structures with Neutral Red for pH Sensing Applications | Zendy

Javier Goicoechea | Zendy; Francisco J. Arregui | Zendy; Jesús M. Corres | Zendy; Ignacio R. Matı́as | Zendy

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Study and Optimization of Self‐Assembled Polymeric Multilayer Structures with Neutral Red for pH Sensing Applications

Author(s) -

Javier Goicoechea,

Francisco J. Arregui,

Jesús M. Corres,

Ignacio R. Matı́as

Publication year - 2007

Publication title -

journal of sensors

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.399

H-Index - 43

eISSN - 1687-7268

pISSN - 1687-725X

DOI - 10.1155/2008/142854

Subject(s) - allylamine , materials science , acrylic acid , fabrication , layer by layer , thin film , chemical engineering , spectroscopy , nanotechnology , atomic force microscopy , layer (electronics) , polyelectrolyte , polymer , monomer , composite material , medicine , alternative medicine , physics , engineering , pathology , quantum mechanics

The characterization of nanostructured thin films is critical in the design and fabrication of optical sensors. Particularly, this work is a detailed study of the properties of layer-by-layer electrostatic self-assembled multilayer (LbL) structures fabricated using poly(allylamine hydrochloride) (PAH) and Neutral Red (NR) as cations, and poly(acrylic acid) (PAA) as polyanion. These LbL films, due to the colorimetric properties of the NR, are suitable for sensor applications such as pH sensing in the physiological range. In the (PAH+NR/PAA) LbL structure, it has been observed a very important influence of the pH of the solutions in the properties of the resultant films. Different techniques such as spectroscopy and atomic force microscopy (AFM) are combined to characterize the films, and the results are analyzed showing coherence with previous works. The LbL structure is finally optimized and dramatically improved nanostructured films were fabricated, showing good sensing properties, short response times, and good stability

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