. 2021 Nov 3;6(45):30281–30291. doi: 10.1021/acsomega.1c02222

Table 2. Selectivity of ISFETs Measured in a HEPES-Buffered Locke’s Solution^a.

graphene support
	Ca²⁺ Selective Membrane
	S_{V_Dirac}^{Ca²⁺/Na⁺}	S_{g_m}^{Ca²⁺/Na⁺}	S_{V_Dirac}^Ca²⁺/K⁺	S_{g_m}^Ca²⁺/K⁺
SiO₂	1.57	45.4	1.76	228
hBN	2.09	1610	2.28	3710
	K⁺ Selective Membrane
	S_{V_Dirac}^K⁺/Ca²⁺	S_{g_m}^K⁺/Ca²⁺	S_{V_Dirac}^K⁺/Na⁺	S_{g_m}^K⁺/Na⁺
SiO₂	13	72.7	2.65	5.96
hBN	12.8	279	2.67	8.69
	Na⁺ Selective Membrane
	S_{V_Dirac}^{Na⁺/Ca²⁺}	S_{g_m}^{Na⁺/Ca²⁺}	S_{V_Dirac}^Na⁺/K⁺	S_{g_m}^Na⁺/K⁺
SiO₂	12.6	60.5	2.65	8.95
hBN	13.8	111	2.55	7.85

S_{V_Dirac}^{Ca²⁺/Na⁺} denotes selectivity of detecting Ca²⁺ over Na⁺ with sensitivity measured in terms of the shift in V_Dirac. Values rounded to first three accurate digits.

Table 2. Selectivity of ISFETs Measured in a HEPES-Buffered Locke’s Solutiona.

Table 2. Selectivity of ISFETs Measured in a HEPES-Buffered Locke’s Solution^a.