Three-electrode photoelectrochemical chip and application thereof in detection of glucose and mercury ions
A photoelectrochemical, three-electrode technology, applied in the direction of electrochemical variables of materials, can solve rare and other problems, and achieve the effect of simple use, simple operation process and cheap production
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Embodiment 1
[0092] A preparation method and detection of a photoelectrochemical cloth chip for enzyme-free glucose detection, comprising the following steps:
[0093] (1) Cloth chip obtained by screen printing technology
[0094] According to the method of Example 1 of Chinese invention patent ZL201510387790.8, a three-electrode cloth chip was prepared;
[0095] (2) Materials required for the modification of the working electrode (WE) of the synthetic cloth chip
[0096] First, polydiallyldimethylammonium chloride (PDDA) functionalized multi-walled carbon nanotubes (MWCNTs) (PDDA-MWCNTs) were prepared. Add 1g MWCNTs to 40mL H 2 SO 4 (95-98%) and HNO 3 (65-68%) in a mixed solution (v / v, 3:1), then ultrasonically shake the mixed solution for 8 hours at room temperature, and finally wash the solution to neutrality (pH 6.5-7.5) by repeated centrifugal washing, The obtained black solid was dried (80° C., 24 h) and stored at room temperature. 0.1 g of acidified MWCNTs was added into 20 mL...
Embodiment 2
[0105] Some important factors (PDDA-MWCNTs concentration, CdS QDs concentration, excitation wavelength, optical power density, voltage size, NaOH concentration) is optimized:
[0106] a) Preferred concentration of PDDA-MWCNTs
[0107] 1. The concentration of glucose to be tested is 100μΜ, the concentration of gradient PDDA-MWCNTs, the concentration of CdS QDs is 5.3g / L, the wavelength is 365nm, and the optical power density is 69.23mW cm -1 , the voltage is 0.1V, and the NaOH concentration is 0.1M.
[0108] 2. Several experimental groups were set up: the concentration of PDDA-MWCNTs was set to several different values (0g / L, 1g / L, 2g / L, 3g / L, 3.5g / L, 4g / L, 4.5g / L, 5g / L).
[0109] 3, steps and other materials are identical with embodiment 1, and test result is as follows figure 2 shown.
[0110] It can be seen from the experimental results that the photocurrent intensity increases with the increase of the concentration of PDDA-MWCNTs, and begins to decrease when the con...
Embodiment 3
[0137] The optimized conditions explored in Example 2 were used for quantitative detection of glucose on the photoelectrochemical cloth chip.
[0138] 1. Several experimental groups are set: glucose standard samples are set to several different values (0 μM, 0.05 μM, 0.1 μM, 1 μM, 10 μM, 50 μM, 100 μM, 500 μM, 1000 μM);
[0139] 2. Steps and other materials are the same as in Example 1, and the preferred parameters are the same as in Example 2.
[0140] Depend on Figure 8 It can be seen that there is a certain linear relationship between the photocurrent intensity (expressed by Y) and the logarithmic value of glucose concentration (expressed by X), the linear equation can be expressed as Y=4.033X+12.898, and the square value of the correlation coefficient is 0.9949.
[0141] The method used to calculate the detection limit is: X L =X b +3S b (X b is the average photocurrent signal of the blank control, S b is the standard deviation of the blank control) (five repeated...
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