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Page 12 of 15 Cheng et al. Soft Sci. 2026, 6, 36

Figure 5. (A-C) LSV curves of the yarns prepared with different NiHCF-MIP amounts (0.6, 1.2, and 2.4 wt%) tested in blank and 1
nmol/L~10 μmol/L cortisol. Ag/AgCl as the reference electrode and Pt as the counter electrode; (D) Linear fitting plots (n = 3, signifying 3
independent sensors); (E) Summary and comparison of current difference (DI) and sensitivity (n = 3, signifying 3 independent sensors);
(F) Calibration curve of the amperometric response versus cortisol concentration in artificial sweat, ranging from 1 nmol/L to 10 μmol/L.
Inset: calibration plot with a linear fit (n = 3, signifying 3 independent sensors); (G) Selectivity of the yarns towards cortisol and other
sweat secretions (n = 3, signifying 3 independent sensors); (H) LSV current response of the sensing fiber to a fixed cortisol concentration
(1 μmol/L) under various mechanical deformations (e.g., bending at 0°, 30°, 60°, and 90°) (n = 3, signifying 3 independent sensors); (I)
Long-term stability assessment of the fiber sensor for detecting a fixed cortisol concentration (1 μmol/L) (n = 3, signifying 3 independent
sensors). Error bars represent the SD of the mean from three sensors in (D-I). LSV: Linear sweep voltammetry; NiHCF: nickel
hexacyanoferrate; MIP: molecularly imprinted polymer; SD: standard deviation.

Table 1. Comparison of sensing properties with previous related reports
Incubation
Sensing materials Test methods Sensitivity LOD Refs.
time
PB-MIP CA 38.8 nA·dec -1 0.9 nmol/L 120 s [15]
AuNPs-MIP SWV 2.061 μA·dec -1 200 fmol/L 480 s [35]
CNTfiber-PB-MIP CA 48.7 μA·dec -1 1 pmol/L 120 s [19]
MXene/AuNPs-aptamer DPV 0.389 μA·dec -1 0.276 nmol/L 40 min [36]
PB-MIP-PEDOT:PSS LSV 2.549 μA·dec -1 0.36 nmol/L 150 s [37]
NiHCF-MIP LSV 2.08 μA·dec -1 0.4 nmol/L 120 s This work

LOD: Limit of detection; PB: Prussian blue; MIP: molecularly imprinted polymer; CA: chronoamperometry; AuNPs: gold nanoparticles; SWV: square
wave voltammetry; CNT: carbon nanotube; DPV: differential pulse voltammetry; PEDOT: poly(3,4-ethylenedioxythiophene); PSS:
poly(styrenesulfonate); LSV: linear sweep voltammetry; NiHCF: nickel hexacyanoferrate.