研究目的
To demonstrate the detection of H2O2 with a novel, ?exible and non-enzymatic electrochemical sensor based on a laser scribed graphene electrode decorated with silver nanoparticles(LSG-Ag).
研究成果
A ?exible electrochemical device based on LSG and electrodeposited AgNps for non-enzymatic H2O2 detection was developed. The laser-induced sensor showed a wide linear range from 0.1 to 10 mM (R2 = 0.9982) and low LOD of 7.9 μM (n = 3). The LSG-Ag sensor showed a fast amperometric response after only 3 s, high repeatability and reproducibility with low loss of performance after continuous bending. The method conveniently produces ?exible laser-induced sensors, that are suitable for the development of sensitivity, selective and integrated electrochemical systems, that can be suitable for trending areas where ?exibility is required such as wearable technology.
研究不足
The limitations include the need for further electrodeposition and chlorination of the patterned reference electrode to overcome higher background noise and higher impedance compared with the conventional electrochemical cell.
1：Fabrication of LSG electrodes:
Graphite oxide was obtained by Hummers method and ultrasonically exfoliated to obtain GO. A solution prepared with GO and distilled water was drop casted over a PET sheet attached to the top of a LightScribe CD. The CD was allowed to dry at room temperature prior to laser irradiation using the 780 nm 5 mW infrared laser from the DVD unit. Designs for single electrodes and three-electrode system (LSG-3E) were created in Corel Draw and transferred to the GO film using the LightScribe freeware.
2：Electrodeposition of silver nanoparticles:
Decoration of LSG electrode with silver nanoparticles (LSG-Ag) was performed by electrodeposition using a three-electrode configuration.
3：Detection and selectivity of hydrogen peroxide with LSG-Ag electrode:
The electrochemical response of LSG-Ag electrode to H2O2 solutions prepared in PBS at pH
4：4 were tested using CV with potentials from -8 to 2 V. The amperometric detection of H2O2 was performed from 1 to 10 mM at a constant potential of -5 V with triplicate measurements. Flexibility test with LSG-Ag electrode:
To evaluate the flexibility of the LSG-Ag electrode, H2O2 solutions from 1 to 10 mM were measured after continuously bending the device against a 5 mm cylinder for 20, 40 and 80 times.
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