Table 3. Comparison of the Analytical Performance of the Flexible Electrochemical NiS/Ni-foam Sensor with Other Sensors Used for the Analysis of DNA Nucleobases.

Material	Synthesis route	Electrode fabrication	Flexible	NB’s	Linear range	LOD	Ref
MWCNTs-COOH	DSP	drop cast	no	G	0.04–130 μM	0.0055 μM	(83)
				A	0.06–130 μM	0.0072 μM
Cu-MOF/GO composites	DSP	drop cast	no	G	(0.02–10)–(20–100) μM	0.012 μM	(62)
				A	(0.005–20)–(40–200) μM	0.002 μM
graphitic carbon nitride nanoflakes	DSP	drop cast	no	G	0.3 × 10–7–6.6 × 10–6 M	4.7 nM	(61)
				A	0.3 × 10–7–7.3 × 10–6 M	3.5 nM
				T	5.3 × 10–6–63.3 × 10–4 M	55 nM
Cu@Ni/MWCNTs	DSP	drop cast	no	G	1.0–180 μM	0.17 μM	(67)
				A	2.0–150 μM	0.33 μM
DomP/s-SWNTs	DSP	drop cast	no	G	0.5–100 μM	3.394 μM	(84)
				A	0.5–140 μM	3.594 μM
Co3O4@ TADM COF/MWCNT	DSP	drop cast	no	G	0.6–180 μM	0.020 μM	(85)
				A	0.6–180 μM	0.024 μM
GQDs-AgNC	DSP	drop cast	no	G	0.1–6.0 μM	0.1 μM	(86)
				A	0.1–5.0 μM	0.1 μM
AuPtNCs-rGO	DSP	drop cast	no	G	1.0 μM to 0.2 mM	60 nM	(87)
				A	1.0 μM to 0.2 mM	100 nM
WS2 nanosheet	DSP	hydrothermal method	yes	G	0.5 μM–20 μM	20 μM	(88)
		temp-265 °C		A	0.5 μM–20 μM	20 μM
MoS2	DSP	hydrothermal method	no	G	15–120 μM	0.76 μM	(89)
		temp-200 °C		A	15–120 μM	2.38 μM
2-D Marcasite FeS2	DSP	drop cast	no	G	500–2000 μM	254 μM	(90)
				A	500–2000 μM	313 μM
				T	500–2000 μM	294 μM
				C	500–2000 μM	387 μM
NiS	SSP	hydrothermal method	yes	G	200 μM–1000 μM	147.6 μM	this work
		temp-135 °C		A	200 μM–1000 μM	159 μM
				T	50 μM–500 μM	16.8 μM
				C	50 μM–500 μM	45.9 μM