Although lateral flow assays (LFAs) are currently being a handful of diagnostic technologies that can identify severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and other common respiratory viruses in one strip, it remains a grand challenge to substantially enhance their sensitivity. We propose here a straightforward method to overcome such drawbacks by employing nitrocellulose (NC) membrane femtosecond laser micromachining to control the analyte flow rate. The findings provided in this work indicate that tailoring the diameters of the μ-channels in NC can effectively expedite the immunological reaction time between the analyte and the labeled antibody, leading to an observable signal increase compared to pristine LFA.
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