Abstract
An ultrasensitive enzyme-free glucose sensor was facilely prepared by electrodepositing three-dimensional dendritic Cu on a room temperature exfoliated graphite-derived film (RTEG-F). An excellent electrocatalytic performance was demonstrated for glucose by using Cu/RTEG-F as an electrode. In terms of the high conductivity of RTEG-F and the good catalytic activity of the dendritic Cu structures, the sensor demonstrates high sensitivities of 23.237 mA/mM/cm2, R2 = 0.990, and 10.098 mA/mM/cm2, R2 = 0.999, corresponding to the concentration of glucose ranging from 0.025 mM to 1.0 mM and 1.0 mM to 2.7 mM, respectively, and the detection limit is 0.68 μM. In addition, the Cu/RTEG-F electrode demonstrates excellent anti-interference to interfering species and a high stability. Our work provides a new idea for the preparation of high-performance electrochemical enzyme-free glucose sensor.
Highlights
In the process of preventing diabetes, it is very important to obtain the blood glucose concentration quickly and effectively [1]
Enzyme-free glucose sensors have received more attention recently, and they need catalytic active sites to react with glucose, which is similar to enzyme glucose sensors [4]
The enzyme-free glucose sensors avoid the shortcomings of enzyme glucose sensors, one of which is being affected by environmental factors [5]
Summary
In the process of preventing diabetes, it is very important to obtain the blood glucose concentration quickly and effectively [1]. Enzyme glucose sensors are very popular and have good selectivity and sensitivity, which is mainly due to the unique selectivity of glucose oxidase (GOx) to glucose [3]. Enzyme-free glucose sensors have received more attention recently, and they need catalytic active sites to react with glucose, which is similar to enzyme glucose sensors [4]. The enzyme-free glucose sensors avoid the shortcomings of enzyme glucose sensors, one of which is being affected by environmental factors (temperature, humidity, and toxic chemicals) [5]. The nonenzymatic sensors have high usefulness in body fluids (blood/urine) and food samples’ glucose detection [6]
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