Preparation and application of photoelectrochemical sensor based on cadmium sulfide nanoparticle/titanium dioxide nanowire array composite material
A nanowire array and nanoparticle technology is applied in the field of preparation of photoelectrochemical sensors to achieve the effects of low cost, good anti-interference performance and high signal reproducibility
Active Publication Date: 2021-04-16
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 preparation and application of a photoelectrochemical sensor based on a cadmium sulfide nanoparticle / titanium dioxide nanowire array composite material. The method comprises the following steps of: preparing a TiO2 nanowire array / FTO electrode by adopting a hydrothermal method; and preparing CdS nanoparticles and a TiO2 nanowire array composite material electrode by adopting a hydrothermal method. The photoelectrochemical sensor provided by the invention can be used for detecting nitrite. In the method provided by the invention, the detection of nitrite is mainly based on a brand-new mechanism, namely the etching phenomenon of nitrite on CdS. According to the method, some defects existing in a traditional electrochemical nitrite detection method are overcome, the photoelectrochemical sensor based on a new sensing strategy is constructed on the basis of the newly discovered etching phenomenon of the nitrite to CdS, and the sensor can achieve high-sensitivity and high-selectivity analysis and detection of the nitrite.
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