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Ultrasensitive glucose sensor based on grapheneized carbon fiber substrate and its preparation method
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A glucose sensor, graphene carbon technology, applied in the direction of sensors, carbon fibers, nano-scale sensors, etc., to achieve excellent detection performance, huge application prospects, and simple preparation methods
Active Publication Date: 2021-05-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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The lower limit of detection is about 5mM, and the detection sensitivity needs to be further improved
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Embodiment 1
[0030] Example 1 Ultrasensitive glucose sensor based on grapheneized carbon fiber substrate and its preparation method
[0031] Refer to as figure 1 and image 3 The schematic diagram showing the preparation of the glucose sensor of the present invention:
[0032] (1), select graphene carbon cloth and pretreatment:
[0033] Select a 1×3cm graphene carbon cloth and place it in isopropanol, 0.1M H 2 SO 4 Soak in solution and deionized water for 30 minutes to make it hydrophilic;
[0034] Wherein, the graphene carbon cloth is a carbon cloth (GR / CC) grown with vertical graphene, which is prepared by thermal CVD, specifically at 1100 degrees Celsius, 95% CH 4 and 5%H 2 Under atmospheric conditions, vapor deposition of graphene was carried out for 10 h. The SEM picture of graphene carbon cloth is as follows figure 2 shown, where figure 2 a) SEM of carbon cloth at low resolution, figure 2 b) SEM of carbon cloth at high resolution, figure 2 c) High-resolution SEM of car...
Embodiment 2
[0037] Embodiment 2 performance test
[0038] The glucose sensor prepared in Example 1 was placed in a three-electrode system in which the electrolyte was 0.1M PBS solution with pH=7.4, the working electrode was GOD / GR / CC, the counter electrode was a Pt sheet, and the reference electrode was a saturated calomel electrode. Measure the glucose concentration.
[0039] Figure 4 It is the experimental data chart measured by differential pulse voltammetry (DPV), it can be seen that the sensitivity of the glucose sensor is high at low concentrations, GOD / GR / CC is 1.7μA mM -1 cm -2 (0 ~ 1mM). The detection lower limit of the sensor of the invention can reach 0.1 mM, which greatly improves the lower detection limit of glucose.
[0040] Figure 5 It is the experimental data chart measured by cyclic pulse voltammetry (CV), it can be seen that the sensitivity of the glucose sensor is high at low concentrations, and the GOD / GR / CC is 14.3μA mM -1 cm -2 (0 ~ 1mM). The detection lowe...
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Abstract
The invention belongs to the technical field of material preparation, and in particular relates to an ultrasensitive glucose sensor based on a grapheneized carbon fiber substrate and a preparation method thereof. The method includes selecting carbon cloth with upright graphene grown on the surface, pre-treating it to make it hydrophilic, soaking it directly in PBS solution with pH=7.4 of glucose oxidase, taking it out and drying it at room temperature to obtain a glucose sensor. The invention pushes the lower limit of glucose detection to about 0.1mM, and also has multi-segment corresponding characteristics, which can realize different detection coefficients and capabilities in different glucose concentration ranges, greatly improving its application range and accuracy.
Description
technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to an ultrasensitive glucose sensor based on a grapheneized carbon fiber substrate and a preparation method thereof. Background technique [0002] At present, carbon fiber cloth is widely used as a flexible sensor substrate material due to its flexibility and good chemical stability. There are countless electrochemical sensors based on carbon cloth on the market. Due to favorable factors such as its huge market demand and mild detection conditions, the glucose electrochemical sensor has achieved large-scale commercial production. However, the quality of glucose electrochemical sensors on the market is uneven, and the sensitivity is very low, which greatly limits its application in ultra-low concentration high-end biochemical detection. [0003] Especially with the rise of several emerging industries such as flexible electronics, wearables and big health, t...
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