Electrochemistry Application — Ultrasensitive levofloxacin electrochemical biosensor based on semiconducting covalent organic framework/poly-L-cysteine/triangular Ag nanoplates modified glassy carbon electrode

6 measurement groups · 18 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

chronocoulometry

TABQ-CHHO-COF/Poly-L-Cys/Tri-AgNP/GCE · Electrode

Chronocoulometric curves in blank PBS and PBS + 100 uM LEV; potential jump 0.6 V; equilibrium time 3 min.

Context: target composite sensor
Measurement source: p007-p008 · S5. Chronocoulometry · Fig. S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
blank PBS chronocoulometry regression	Q(mC) = -0.0898 t1/2(s1/2) + 0.0135; R2 = 0.998	—	—	Text Exact Reported	p007-p008 · S5. Chronocoulometry · Fig. S7
chronocoulometry equilibrium time	3 min	—	—	Caption Exact Reported	p007-p008 · S5. Chronocoulometry · Fig. S7
PBS + 100 uM LEV chronocoulometry regression	Q(mC) = -0.341 t1/2(s1/2) + 0.0458; R2 = 0.999	—	—	Text Exact Reported	p007-p008 · S5. Chronocoulometry · Fig. S7
chronocoulometry potential jump	0.6 V	—	—	Caption Exact Reported	p007-p008 · S5. Chronocoulometry · Fig. S7
saturated adsorption amount of LEV	7.01 x 10^-9 mol cm-2	—	—	Text Exact Reported	p007-p008 · S5. Chronocoulometry · Fig. S7

electrochemical impedance spectroscopy

Impedance spectroscopy

bare GCE · Electrode

1.0 mM [Fe(CN)6]3-/4- solution containing 0.1 M KCl; comparison of electrode charge-transfer resistance.

Geometry: three-electrode system with SCE reference and Pt counter electrode
Context: bare electrode control
Measurement source: p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance	313.6 ohm	—	—	Text Exact Reported	p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

electrochemical impedance spectroscopy

Impedance spectroscopy

TABQ-CHHO-COF/GCE · Electrode

1.0 mM [Fe(CN)6]3-/4- solution containing 0.1 M KCl; comparison of electrode charge-transfer resistance.

Geometry: three-electrode system with SCE reference and Pt counter electrode
Context: pristine COF-modified electrode
Measurement source: p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance	21.9 ohm	—	—	Text Exact Reported	p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

electrochemical impedance spectroscopy

Impedance spectroscopy

TABQ-CHHO-COF/Poly-L-Cys/Tri-AgNP/GCE · Electrode

1.0 mM [Fe(CN)6]3-/4- solution containing 0.1 M KCl; comparison of electrode charge-transfer resistance.

Geometry: three-electrode system with SCE reference and Pt counter electrode
Context: target composite sensor
Measurement source: p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistanceMarked as a best value within this paper	12.99 ohm	—	—	Text Exact Reported	p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

electrochemical impedance spectroscopy

Impedance spectroscopy

Poly-L-Cys/Tri-AgNP/GCE · Electrode

1.0 mM [Fe(CN)6]3-/4- solution containing 0.1 M KCl; comparison of electrode charge-transfer resistance.

Geometry: three-electrode system with SCE reference and Pt counter electrode
Context: non-COF composite control
Measurement source: p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance	152 ohm	—	—	Text Exact Reported	p005 · Electrochemical characterization of the modified electrodes · Fig. 2b

CV and Randles-Sevcik analysis

Voltammetry

TABQ-CHHO-COF/Poly-L-Cys/Tri-AgNP/GCE · Electrode

Effective electroactive surface areas measured in 1.0 mM [Fe(CN)6]3-/4- with 0.1 M KCl at scan rates from 40 to 200 mV/s.

Context: target composite sensor and controls
Measurement source: p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
bare GCE electroactive surface area	0.0037 cm2	—	—	SI Table Exact Reported	p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
TABQ-CHHO-COF/GCE electroactive surface area	0.0076 cm2	—	—	SI Table Exact Reported	p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
final composite electroactive surface areaMarked as a best value within this paper	0.0079 cm2	—	—	SI Table Exact Reported	p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
final electroactive area increase versus bare GCEMarked as a best value within this paper	2 times larger than GCE	—	—	Text Rounded Reported	p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
Poly-L-Cys/Tri-AgNP/GCE electroactive surface area	0.0052 cm2	—	—	SI Table Exact Reported	p006-p007 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
bare GCE Randles-Sevcik regression slope	ipa = 2.68 v1/2 (mV/s) + 3.2; R2 = 0.999	—	—	Text Exact Reported	p006 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
TABQ-CHHO-COF/GCE Randles-Sevcik regression slope	ipa = 5.60 v1/2 (mV/s) - 0.965; R2 = 0.999	—	—	Text Exact Reported	p006 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
final composite Randles-Sevcik regression slopeMarked as a best value within this paper	ipa = 5.72 v1/2 (mV/s) - 10.6; R2 = 0.999	—	—	Text Exact Reported	p006 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6
Poly-L-Cys/Tri-AgNP/GCE Randles-Sevcik regression slope	ipa = 3.79 v1/2 (mV/s) + 3.97; R2 = 0.997	—	—	Text Exact Reported	p006 · S4. Effective electroactive surface area of different modified electrodes · Fig. S6