posted on 2025-02-04, 22:13authored byAmanda Neumann, Luiz Otávio Orzari, Juliano Alves Bonacin, Bruno Campos Janegitz
Graphite is one of the most utilized materials for producing
conductive
inks for screen-printed electrodes (SPEs). Because of their wide range
of applications, several brands are available in the market. Consequently,
it is possible to find particles with different properties. In this
context, these differences can generate variations in the device performance.
Based on this, the present work compares paper analytical devices
(PADs), which were prepared with three different graphite brands and
photographic paper, to evaluate how these possible distinctions can
affect the devices’ performance. CA detection was carried out
with square wave voltammetry, where the devices produced with Fisher
Chemical and Sigma-Aldrich graphite stood out for their high stability
and current magnitude. Under the optimized parameters, analytical
curves were constructed for each PAD, resulting in 5.0 × 10–6 to 1.0 × 10–4 mol L–1 and 5.0 × 10–7 to 1.0 × 10–4 mol L–1 for that manufactured with Fisher Chemical
and Sigma-Aldrich graphite, respectively. In addition, the limits
of detection were 1.39 μmol L–1 for the one
produced with Fisher Chemical graphite and 0.288 μmol L–1 for the one produced with Sigma-Aldrich graphite.