Fluorescent patterning of paper through laser engraving

Abstract

Thermal treatment of paper leads to the formation of aromatic structures, allowing patterning the substrates and their use as sensors.

A fluorescence digital image-based method using carbon quantum dots to evaluate the compliance of a biocidal agent

“…19 Another feature of CQDs is the possibility of their functionalization and use as selective sensors. Thus, CQDs have been applied for detection of metal ions, 20 pesticides, 21 inorganic compounds, [22][23][24] reduced or oxidant species, 25 biomolecules 26 and others. Due to the increase in the number of people infected with SARS-COV-2 (severe acute respiratory syndrome coronavirus-2) several prevention methods have been performed as a way to mitigate the transmission of the coronavirus, 27 including the use of a sanitizing mat.…”

Au‐Modified Carbon Electrodes Produced by Laser Scribing for Electrochemical Analysis of Probiotic Activity

“…The electrodes were fabricated by laser scribing of desired patterns on the sheets using laser engraver (Epilog Laser) equipped with 30 W CO 2 laser. The engraver is also capable of laser cutting thus offering a convenient all‐in‐one setup for sensor fabrication [37,38] . The three‐electrode system, which included a counter (CE), a working (WE), and a reference electrode (RE), was first engraved under the raster mode at ~9.6 W (defocused laser power), and ~2.64 mm s −1 lateral speed.…”

“…The engraver is also capable of laser cutting thus offering a convenient all-in-one setup for sensor fabrication. [37,38] The threeelectrode system, which included a counter (CE), a working (WE), and a reference electrode (RE), was first engraved under the raster mode at ~9.6 W (defocused laser power), and ~2.64 mm s À 1 lateral speed. The rectangular sensors were cut into using the laser's vector mode using ~21 W of power (focused on the surface), ~13.2 mm s À 1 lateral speed, and a frequency of 2500 Hz.…”

Printable biosensors towards next-generation point-of-care testing: paper substrate as an example

“…After treating the chromatography paper using a CO 2 laser engraver, a blue fluorescent pattern could be observed when the substrate was irradiated with UV light under selected experimental conditions. 85 Their study reveals the potential of a novel and effective laser printing method for optical biosensor fabrication.…”