Comparison of the electrochemical sensors for the detection of potassium ions.

Sensing material	Detection range	LOD	Method of detection	Detection medium	Types of sample	Ref.
AuE/11-MUA/4-AB-18-C-6	1 μM to 10 mM	N/A	DPV	0.1 TBAB	N/A	151
GCE/GO-crown	0.1–10−7 μM	1 pM	EIS	1.5 mM MB	N/A	152
AuE/G-quadruplex/hemin	0.1 nM to 0.1 μM	0.1 nM	DPV	100 mM Tris–HCl buffer (pH 6.2)	N/A	153
Al–Cu/Si-p/SiO2/Si3N4/PVC-membrane	1 μM to 10−1 M	N/A	EIS	0.1 M Tris–HCl buffer (pH 7)	N/A	154
AuE/K+ ssDNA	10−8 to 10−5 M	2.31 × 10−9 M	CV	MB, AQMS, Na4Fe(CN)6	N/A	153
AuE/p-ATP/AuNPs/DNA	0.1–1 mM	0.1 mM	SWV	0.1 M Tris–HCl buffer (pH 7.41)	N/A	157
	1–30 mM
GCE/P(Py-co-PAA)/G-aptamer	20 fM to 1 mM	14.7 fM	EIS	20 mM Tris–HCl buffer (pH 7.4)	N/A	158
SPC/Nafion/4-AB-18-C-6	1–500 ppm	N/A	DPV	3 mMRu(NH3)6+/0.1 TBAB	N/A	159
SCE/CPE/hollandite-MnO2	4.97 × 10−5 to 9.05 × 10−4 M	N/A	Amperometry	Tris–buffer (pH 8)	N/A	160
GCE/MnO2 nanorods	2–90 μM	0.05 μM	CV	Tris–buffer (pH 7.4)	Tap and DI water	161
CPEM/KSr2Nb2O15	1.26 × 10−5 to 1.62 × 10−3 M	7.27 × 10–5 M	Amperometry	0.1 M Tris–buffer (pH 8.3)	N/A	168
AuE/ssDNS-G rich	0.1 nM to 50 nM	0.1 nM	SWV	20 mM Tris–HCl buffer (pH 7.41)	Human serum	164
Carbon SPE/PANI/valinomycin	10−5 to 1 M	10−5.8 M	Potentiometric	N/A	Artificial serum	75
Al/F-MWCNTs/ZnO/valinomycin	5–25 mM	N/A	EIS	N/A	Soil	166
PET/graphene- valinomycuin	1–20 000 μM	N/A	FET	Tris–HCl buffer	N/A	169
PET/Gel/valinomycin	5–100 μM	N/A	N/A	N/A	Serum	170
3DPE sensors	1–10 000 ppm	1.35 ppm	CV	pH 1.44	Soil pore water samples	167
Valinomycin supported ZnO/rGO nanocomposites on GCE	—	0.956 mM	CV	N/A	Soil sample	171
F-MWCNT/ZnO/valinomycin composites	5–25 mM	—	Impedance	N/A	Soil sample	172
Prussian blue nanotube sensor	5.0 × 10−8 to 7.0 × 10−4 M	2.0 × 10−8 M	CV	N/A	Water	173