Comparison of the LoD with systems in the existing literatures for the sensing of AA.

Catalyst	Method	Limit of detection of ascorbic acid	Reference
Gr/CuPc/PANI	Electrochemical method	6.3 × 10−8 M	7
PANI/HNTs	Electrophoretic deposition method	0.21 μM	39
Graphene-based 3D nanocomposites	Electrochemical method	460 μM	40
Polymer-coated electrodes	Electrochemical method	0.0267 μM	43
PANI/MnO2–Sb2O3	Electrochemical method	0.12 mM	44
S,N co-doped graphene quantum	Fluorescence method	1.2 μM	45
Carbon dots on CoOOH	Fluorescence method	25 nM	46
MoS2-decorated N-doped carbon nanotubes	Colorimetric method	0.12 mM	47
Nickel ferrite nanoparticles on a carbonaceous matrix	Colorimetric method	260 nM	48
Mustard seeds	Colorimetric method	3.26 μM	49
3,4:9,10-perylene tetracarboxylic acid-modified zinc ferrite	Colorimetric method	0.834 μM	50
PANI–MnO2	Colorimetric method	26 nM	29
NF–PANI	Colorimetric method	0.232 nM	Present work