Fig. 2From: CRISPR-Cas13a-powered electrochemical biosensor for the detection of the L452R mutation in clinical samples of SARS-CoV-2 variantsScanning electron microscopy (SEM)Shown are the SEM images of (a) ultrathin Ti3C2 nanosheets (MXene) and (b) MXene-AuNPs composites. (c) SEM-EDS images of corresponding elemental mapping of Au, Ti, C, and O for MXene-AuNPs(AuNP, gold nanoparticle; EDS, energy-dispersive X-ray spectrometry)Back to article page