Authors: Valtencir Zucolotto; Newton M. Barbosa Neto; José J. Rodrigues; Carlos J.L. Constantino; Sérgio C. Zílio; Cléber R. Mendonça; Ricardo F. Aroca; Osvaldo N. Oliveira

Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 7, September 2004 , pp. 855-860(6)

Publisher: American Scientific Publishers

Abstract:

The nanoscale interactions between adjacent layers of layer-by-layer (LBL) films from poly(allylamine hydrochloride) (PAH) and azodye Brilliant Yellow (BY) have been investigated, with the films employed for optical storage and the formation of surface-relief gratings. Using Fourier transform infrared spectroscopy, we identified interactions involving SO₃^- groups from BY and NH₃⁺ groups from PAH. These electrostatic interactions were responsible for the slow kinetics of writing in the optical storage experiments, due to a tendency to hinder photoisomerization and the subse- quent reorientation of the azochromophores. The photoinduced birefringence did not saturate after one hour of exposure to the writing laser, whereas in azopolymer films, saturation is normally reached within a few minutes. On the other hand, the presence of such interactions prevented ther- mal relaxation of the chromophores after the writing laser was switched off, leading to a very stable written pattern. Moreover, the nanoscale interactions promoted mass transport for photoinscription of surface-relief gratings on PAH/BY LBL films, with the azochromophores being able to drag the inert PAH chains when undergoing the trans-cis-trans photoisomerization cycles. A low level of chromophore degradation was involved in the SRG photoinscription, which was confirmed with micro-Raman and fluorescence spectroscopies.

Keywords: LAYER-BY-LAYER FILMS; POLY(ALLYLAMINE HYDROCHLORIDE); BRILLIANT YELLOW AZODYE; PHOTOINDUCED PHENOMENA; OPTICAL STORAGE; RAMAN SPECTROSCOPY; FLUORESCENCE SPECTROSCOPY

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2004.112

Publication date: 2004-09-01

More about this publication?

• Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
• Editorial Board
• Information for Authors
• Subscribe to this Title
• Terms & Conditions
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Technology
• By this author: Valtencir Zucolotto ;  Newton M. Barbosa Neto ;  José J. Rodrigues ;  Carlos J.L. Constantino ;  Sérgio C. Zílio ;  Cléber R. Mendonça ;  Ricardo F. Aroca ;  Osvaldo N. Oliveira

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers