Laser-pyrolyzed electrochemical paper-based analytical sensor for sulphite analysis

Laser‐pyrolysed paper electrodes for the square‐wave anodic stripping voltammetric detection of lead

“…Laser-pyrolysed paper electrodes, also known as laser-scribed paper analytical devices (LSPaDs), have been recently developed (Martins et al, 2019;de Araujo et al, 2017); they are produced during the single-step laser pyrolysis of the cellulosic material, resulting in F I G U R E 2 SWASV curves obtained for different concentrations of Pb, and 10 ppm of Zn as the internal standard (moving average baseline correction was applied to the original voltammograms). Inlay a: the corresponding calibration curve, ratio of peak current Pb/Zn vs. Pb concentration.…”

Microfluidic Paper-Based Analytical Devices: From Design to Applications

“…There are various techniques to incorporate electrodes into ePADs, such as screen printing, ,, stencil printing, − inkjet printing, ,, pencil/pen drawing, − microwire placement, , laser scribing, , and sputtering. ,, Screen printing was the first reported method for fabricating ePADs, where a custom-made screen or mesh (typically made of silk or nylon) is used to pattern conductive inks onto paper. Carbon composite inks are typically used; however, metal inks have also been reported for screen printing electrodes.…”

“…Thus, multiple layers of printing are often necessary to achieve sufficient conductivity in the printed electrodes, which can increase the fabrication time. Another automated technique to create carbon electrodes on paper is by laser scribing. , This technique employs a CO 2 laser to pyrolyze the surface of the paper to produce conductive carbon as an electrode. Laser scribing is considered a greener alternative to the previously described methods as no chemicals are required for the fabrication.…”

A pencil graphite-based disposable device for electrochemical monitoring of sulfanilamide in honey and water samples

“…2–4 The main advantages of disposable devices refer to the possibility of building miniaturized sensors that require smaller sample volumes and reagents, which results in minimal waste generation. 5–8 Furthermore, these devices can be constructed by combining different alternative materials that act synergistically leading to electrocatalytic effects on to redox processes, 3,9 and can be easily replaced circumventing the problems of poisoning and renewing the electrode surface. 1…”