A kind of preparation method of composite structure sensor for detecting clenbuterol hydrochloride
A technology of clenbuterol hydrochloride and composite structure, which is applied in the field of gold nanoparticle and nanoporous conductive diamond composite structure sensor and its preparation, can solve the problems of easy adsorption of oxidation products, lower detection efficiency and sensitivity, etc., and achieve good electrical conductivity Chemical properties, repeated detection results are stable, and the effect of low cost
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Embodiment 1
[0029] Example 1 Preparation of gold nanoparticles and nanoporous boron-doped diamond composite structure sensor
[0030] The silicon wafer is pretreated with nano-diamond powder and then placed in a microwave plasma chemical vapor deposition equipment chamber for boron-doped diamond film deposition. The gas flow ratio in the film preparation process was hydrogen:methane:trimethyl borate=200:6:2 (sccm). Subsequently, gold nanofilms were deposited on the surface of boron-doped diamond by ion sputtering for 20 seconds, with an average thickness of 40 nm, to obtain a gold film-boron-doped diamond film structure. The scanning electron microscope image is as follows: figure 1 shown. It can be seen that the boron-doped diamond has a complete crystal form, clear grain boundaries and smooth surface, the main crystal orientation is (111) crystal plane, and the gold nanofilm is evenly distributed. Then it was placed in a tube furnace and heated from room temperature to 800°C under arg...
Embodiment 2
[0031] Example 2: Preparation and processing of boron-doped diamond film (without gold)
[0032] The silicon wafer is pretreated with nano-diamond powder and then placed in a microwave plasma chemical vapor deposition equipment chamber for boron-doped diamond film deposition. The gas flow ratio in the film preparation process was hydrogen:methane:trimethyl borate=200:6:2 (sccm). Then it was placed in a tube furnace and heated from room temperature to 800°C under high-purity argon protective gas at a heating rate of 5°C min -1 . When the temperature reaches the requirement, pass argon gas as the carrier gas into the conical flask containing ultrapure water (40℃), and the gas flow rate is 150mL min -1 , the water vapor is brought into a high temperature tube furnace for annealing for 2 hours. The structure of boron-doped diamond thin film (no gold, same annealing treatment) is obtained, and its scanning electron microscope image is as follows Figure 4 . It can be seen that...
Embodiment 3
[0035] Example 3: Cyclic Voltammetry Test of Sample 1# and Sample 2#
[0036] Using the composite structure sensor sample 1# prepared in Example 1 and the sample 2# prepared in Example 2, the low concentration (5.0×10 -6 mol L-1 ) Clenbuterol hydrochloride for detection, see the current-voltage curve Figure 5 . After comparison, it can be found that sample 1# has an oxidation peak signal in the detection of clenbuterol hydrochloride, while sample 2# does not have any peak signal, which can prove that the use of boron-doped diamond film alone cannot achieve low detection of clenbuterol hydrochloride. The composite structure enhances the electrochemical activity of the sensor and can be used as a detection sensor, which plays an important role in improving the detection level of clenbuterol hydrochloride.
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