Processing of electroactive nanostructured films incorporating carbon nanotubes and phthalocyanines for sensing


Autoria(s): SIQUEIRA JUNIOR, Jose; GASPAROTTO, Luiz H. S.; OLIVEIRA JUNIOR, Osvaldo Novais de; ZUCOLOTTO, Valtencir
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2008

Resumo

The use of carbon nanotubes (CNTs) combined with other materials in nanostructured films has demonstrated their versatility in tailoring specific properties. In this study, we produced layer-by-layer (LbL) films of polyamidoamine-PAMAM-incorporating multiwalled carbon nanotubes (PAMAM-NT) alternated with nickel tetrasulfonated metallophthalocyanine (NiTsPc), in which the incorporation of CNTs enhanced the NiTsPc redox process and its electrocatalytic properties for detecting dopamine. Film growth was monitored by UV-vis spectroscopy, which pointed to an exponential growth of the multilayers, whose roughness increased with the number of bilayers according to atomic force microscopy (AFM) analysis. Strong interactions between -NH3+ terminal groups from PAMAM and -SO3- from NiTsPc were observed via infrared spectroscopy, while the micro-Raman spectra confirmed the adsorption of carbon nanotubes (CNTs) onto the LbL film containing NiTsPc. Cyclic voltammograms presented well-defined electroactivity with a redox pair at 0.86 and 0.87 V, reversibility, a charge-transfer controlled process, and high stability up to 100 cycles. The films were employed successfully in dopamine (DA) detection, with limits of detection and quantification of 10(-7) and 10(-6) mol L-1, respectively. Furthermore, films containing immobilized CNTs could distinguish between DA and its natural interferent, ascorbic acid (AA).

Identificador

JOURNAL OF PHYSICAL CHEMISTRY C, v.112, n.24, p.9050-9055, 2008

1932-7447

http://producao.usp.br/handle/BDPI/29780

10.1021/jp800976f

http://dx.doi.org/10.1021/jp800976f

Idioma(s)

eng

Publicador

AMER CHEMICAL SOC

Relação

Journal of Physical Chemistry C

Direitos

restrictedAccess

Copyright AMER CHEMICAL SOC

Palavras-Chave #BY-LAYER FILMS #POLYELECTROLYTE MULTILAYERS #PLATINUM NANOPARTICLES #BIOSENSORS #COMPOSITES #DENDRIMERS #GROWTH #NANOCOMPOSITES #ASSEMBLIES #NANOSCALE #Chemistry, Physical #Nanoscience & Nanotechnology #Materials Science, Multidisciplinary
Tipo

article

original article

publishedVersion