A kind of preparation method and use of composite material for biosensor
A composite nanomaterial and nitride technology, applied in the field of biosensors, can solve the problems of nanoparticle agglomeration and small specific surface area, and achieve the effect of high catalytic activity and large specific surface area.
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Embodiment 1
[0029] Example 1 Preparation of different kinds of nitride carriers
[0030] Taking the hydrothermal-amination method in the prior art (Acta Catalysis, 2019, 40(2): 160-167) as a template and improving the amination conditions, design and prepare different kinds of nitride carriers, and measure the properties of the nitride carriers. Specific surface area, the method is as follows:
[0031] 1) Take 10 mmol of different kinds of metal salts (Fe(NO) 3 ) 3 , Cu(NO 3 ) 2 , Ni(NO 3 ) 2 , Zn(NO 3 ) 2 ·6H 2O), 0.3mmol of precipitant cyclohexamethylenetetramine were added to 100ml of water and nitrogen nitrogen dimethylformamide solution (water / DMF=1:1), and then transferred to polytetrafluoroethylene lining after stirring The temperature was raised to 130-150 °C in the hydrothermal reaction kettle for 12-24 h, then cooled to room temperature, filtered, washed with acetone, and then vacuum-dried to constant weight at 40-50 °C to obtain the precursor;
[0032] 2) Place the pr...
Embodiment 2
[0039] In order to further solve the defect of easy aggregation of Zn / Cu bimetallic nitride nanoparticles, the present invention attempts to add different kinds of additives (such as classic cetyltrimethylammonium bromide, sodium oleate) to the step of hydrothermal reaction The conditions were optimized, and it was surprisingly found that the introduction of diethylenetriamine could transform the Zn / Cu bimetallic nitride from a disordered two-dimensional sheet-like stacking structure to an ordered three-dimensional spherical structure, and could further increase the composite nitride's specific surface area.
[0040] The specific preparation method is as follows:
[0041] 1) Take 10mmol Cu(NO 3 ) 2 and 10mmolZn(NO 3 ) 2 ·6H 2 O, 0.3mmol precipitant cyclohexamethylenetetramine and 0.5mmol diethylenetriamine were added to the solution of 100ml water and nitrogen nitrogen dimethylformamide (volume ratio water / DMF=1:1), after stirring evenly Transfer to a polytetrafluoroethy...
Embodiment 3
[0045] Using the three-dimensional spherical Zn / Cu bimetallic nano-nitride prepared by adding diethylenetriamine in Example 2 as a carrier, the graphene quantum dots are loaded to make electrodes, and the method is as follows:
[0046] Take 10 mg of three-dimensional spherical Zn / Cu bimetallic nano-nitrides in 10 ml of anhydrous methanol to form a 1 mg / ml dispersion system, and then add 10 mg of graphene quantum dots (XF075) and ultrasonically for more than 24 hours at room temperature to obtain Zn / Cu-GQDs containing Zn / Cu-GQDs. Alcohol solution of composite nanomaterials (sampling and drying to remove methanol and then scanning electron microscope detection, such as figure 2 It can be seen that the graphene quantum dots are uniformly distributed on the three-dimensional spherical Zn / Cu bimetallic nano-nitride).
[0047] Take 10 μl of the alcoholic solution of Zn / Cu-GQD composite nanomaterials and drop it onto the pretreated ITO electrode (1 × 1 cm 2 ) surface, after drying ...
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