Fabrication and application of photoelectrochemical sensors based on cadmium sulfide nanoparticles/titanium dioxide nanowire array composites
A nanowire array and nanoparticle technology, which is applied in the field of photoelectrochemical sensor preparation, achieves good anti-interference performance, high signal reproducibility, and is beneficial to portability.
Active Publication Date: 2022-03-15
GUANGZHOU UNIVERSITY
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The above studies show that the photoelectrochemical method can achieve high-performance analysis and detection of nitrite, but there are relatively few studies of this type at present, so it also has great application prospects and performance improvement potential
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Embodiment 1
[0051] (1) TiO 2 Preparation of nanowire array / FTO: Mix 15mL of water and 15mL of hydrochloric acid (~37wt% concentrated hydrochloric acid), and then add 0.4mL of tetraisopropyl titanate to prepare a hydrothermal reaction solution. Cut the FTO conductive glass into a size of 0.8cm×2.5cm, and clean it ultrasonically. Put the conductive surface of the glass piece into the inner tank of the hydrothermal reaction kettle at an angle, and add 6mL of the hydrothermal reaction solution. The reaction kettle was sealed and put into an oven, and kept at 150° C. for 5 hours. Take out the FTO conductive glass sheet, wash it and dry it. Since the hydrothermal reaction solution has not completely submerged the glass sheet, only a part of the surface of the FTO conductive glass sheet is decorated with TiO 2 nanowire array ( figure 1 a) in. Put the FTO conductive glass sheet into a ceramic crucible, put the crucible into a muffle furnace, raise the temperature to 500°C at 3°C / min and keep ...
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The invention discloses the preparation and application of a photoelectrochemical sensor based on cadmium sulfide nanoparticle / titanium dioxide nanowire array composite material. The method comprises the steps of: preparing TiO by hydrothermal method 2 Nanowire array / FTO electrode; preparation of CdS nanoparticles and TiO by hydrothermal method 2 Nanowire array composite electrodes. The photoelectrochemical sensor provided by the invention can be used to detect nitrite. In the method of the present invention, the detection of nitrite is mainly based on a brand-new mechanism—the etching phenomenon of CdS by nitrite. The method of the present invention overcomes some disadvantages in the traditional method for electrochemical detection of nitrite, and based on the newly discovered etching phenomenon of nitrite on CdS, a photoelectrochemical sensor based on a new sensing strategy is constructed, and the sensor It can realize the analysis and detection of nitrite with high sensitivity and high selectivity.
Description
technical field [0001] The invention belongs to the technical field of photoelectrochemical sensing, and in particular relates to the preparation and application of a photoelectrochemical sensor based on cadmium sulfide nanoparticle / titanium dioxide nanowire array composite material. Background technique [0002] Nitrite is a chemical compound of great concern to the food industry, which can be found in many types of natural and processed foods. Nitrite can be transferred to fruits and vegetables from polluted soil or water sources caused by the abuse of chemical fertilizers; it may also be produced by bacteria reducing nitrate in spoiled food; it is also an additive for meat products, which can prevent meat and color enhancement. Given the fact that it is ubiquitous in food, the serious physiological problems that can arise from ingestion of nitrite cannot be ignored. Ingestion of large doses of nitrite can cause it to combine with hemoglobin in human red blood cells to c...
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IPC IPC(8): G01N27/36B82Y15/00B82Y30/00B82Y40/00
Inventor 牛利韩冬雪高博文
Owner GUANGZHOU UNIVERSITY