Fig. 2.

(a) Photograph, (b) corresponding scanning waveforms of fluorescence, (c) fluorescence intensity of SiTQD-based ICA with different concentration of SARS-CoV-2 NP antigen and FluA H1N1: (i) 10 ng/mL, 10⁴ pfu/mL; (ii) 10 ng/mL, 0 pfu/mL; (iii) 0 ng/mL, 10⁴ pfu/mL; and (iv) 0 ng/mL, 0 pfu/mL. (d) Typical SEM images of the test zone for SARS-CoV-2 NP antigen concentrations of 10 ng/mL (*) and 0 ng/mL (**). Optimization of (e) SARS-CoV-2 NP capture antibody and (f) FluA capture antibody concentration on the T line. The error bars showed standard deviations calculated from three tests.