CN-116773617-B - Sensor for detecting thiophene sulfides in diesel oil and preparation method and application thereof

Abstract

The invention discloses a sensor for detecting thiophene sulfides in diesel oil, a preparation method and application thereof, wherein the sensor comprises a substrate, an interdigital conducting layer is etched on the surface of the substrate, and a molybdenum disulfide nano material or a ZnS-ZnO shell-core structure nano rod material is arranged at an interdigital position. According to the invention, a zinc sulfide-zinc oxide shell-core structure nanorod is grown on a substrate with an interdigital conductive layer on the surface by utilizing a hydrothermal growth method to prepare the sensor for detecting thiophene sulfides in diesel oil, the sensor can stably exist in the diesel oil for a long time, a sensitive material can interact with the thiophene sulfides in the diesel oil to influence the charge density at an interdigital position, so that capacitance change is generated, and the concentration of the thiophene sulfides in the diesel oil is detected by detecting the capacitance change of the sensor through LCR. The invention has the advantages of low cost, simple preparation method, high portability of the sensor, good sensitivity and capability of realizing rapid and accurate measurement of thiophene sulfides in diesel oil.

Inventors

• CHENG XINQUN
• XU ZIYI
• GAO YUNZHI

Assignees

• 哈尔滨工业大学

Dates

Publication Date

20260508

Application Date

20230508

Claims (7)

1. 1. The sensor for detecting thiophene sulfides in diesel oil is characterized by comprising a substrate, wherein an interdigital conducting layer is etched on the surface of the substrate, molybdenum disulfide nano materials or ZnS-ZnO shell core structure nano rod materials are grown on interdigital positions in a hydrothermal mode, the interdigital conducting layer is made of fluorine-doped tin dioxide, and the finger spacing of the interdigital conducting layer is 50-100 mu m.
2. 2. The sensor for detecting thiophenic sulfides in diesel according to claim 1, wherein said interdigital conductive layer is made from a laser etched substrate.
3. 3. Sensor for detecting thiophenic sulfides in diesel fuel according to claim 1 or 2, characterized in that said substrate is a conductive glass substrate.
4. 4. A method for manufacturing a sensor for detecting thiophenic sulfides in diesel fuel according to any one of claims 1 to 3, characterized in that said method comprises the steps of: step one, etching an FTO substrate conductive surface by laser to prepare an interdigital conductive layer; And secondly, growing a molybdenum disulfide nano material or a ZnS-ZnO nano rod material on the interdigital conducting layer by adopting a hydrothermal method.
5. 5. Use of a sensor according to any one of claims 1 to 3 for testing the content of thiophenic sulfides in diesel fuel.
6. 6. The application of the sensor in testing the content of thiophene sulfides in diesel oil according to claim 5 is characterized in that the method for testing the content of thiophene sulfides in diesel oil is characterized by comprising the steps of connecting an external lead of the sensor with LCR, placing the sensor into diesel oil, and testing the capacitance change of the sensor in diesel oil samples with different benzothiophene concentrations.
7. 7. The application of the sensor in testing the content of thiophene sulfides in diesel oil, which is characterized in that after the sensor is connected with LCR, the sensor is soaked in normal hexane solution to obtain a base line value, and when the capacitance of the sensor is tested, the LCR tester is set to be 1V and the frequency is 10kHz.

Description

Sensor for detecting thiophene sulfides in diesel oil and preparation method and application thereof Technical Field The invention belongs to the technical field of sensors, relates to a sensor and a preparation method and application thereof, and in particular relates to a sensor for detecting thiophene sulfides in diesel oil and a preparation method and application thereof. Background The too high sulfur content in the diesel oil can reduce the service life of the vehicle power part, accelerate the corrosion of oil refining equipment, and the burning of sulfur-containing organic matters can generate sulfur dioxide and other gases which are toxic and harmful to human bodies and natural environments. At present, most methods for measuring the sulfur content in oil, such as coulomb method, ultraviolet fluorescence method, X-ray fluorescence method and the like, need large-scale instruments, and have poor portability and high cost. Therefore, a portable, rapid, highly sensitive, highly selective detection method is needed. Disclosure of Invention The invention provides a sensor for detecting thiophene sulfides in diesel oil, and a preparation method and application thereof, in order to solve the problems of poor portability and high cost of the existing method for detecting sulfur content in diesel oil. According to the invention, a zinc sulfide-zinc oxide shell-core structure nanorod is grown on a substrate with an interdigital conductive layer on the surface by utilizing a hydrothermal growth method to prepare the sensor for detecting thiophene sulfides in diesel oil, the sensor can stably exist in the diesel oil for a long time, a sensitive material can interact with the thiophene sulfides in the diesel oil to influence the charge density at an interdigital position, so that capacitance change is generated, and the capacitance change of the sensor is detected by a digital bridge measuring instrument (LCR) to detect the concentration of the thiophene sulfides in the diesel oil. The invention aims at realizing the following technical scheme: the sensor for detecting thiophene sulfides in diesel oil comprises a substrate, wherein an interdigital conducting layer is etched on the surface of the substrate, and a molybdenum disulfide nano material or a ZnS-ZnO shell-core structure nano rod material is arranged at an interdigital position, wherein: the substrate is a conductive glass (FTO) substrate; the interdigital conducting layer is prepared by etching a substrate by laser; The interdigital conducting layer is made of fluorine-doped tin dioxide; The finger spacing of the interdigital conducting layer is 50-100 mu m, if the finger spacing is too large, the sensitivity of the sensor is reduced, and if the finger spacing is too small, the requirements on the sensor preparation process are too high, and the manufacturing cost is increased; The sensor and the sensitive material thereof can stably exist in diesel oil, the interaction of the sensitive material and thiophene sulfides can influence the charge density at the interdigital position, so that the change of capacitance is generated, the sensitive material is mainly ZnS material, znO is a part which is not completely converted, and also can be molybdenum disulfide or other metal ions are metal sulfide materials of interface acid or soft acid. The preparation method of the sensor for detecting thiophene sulfides in diesel oil comprises the following steps: step one, etching an FTO substrate conductive surface by laser to prepare an interdigital conductive layer; Secondly, growing a molybdenum disulfide nano material or a ZnS-ZnO nano rod material on the interdigital conducting layer by adopting a hydrothermal method, wherein: in the hydrothermal reaction, the substrate is fixed on a bracket, and the conductive surface is placed in a reaction kettle downwards; When the ZnO nano rod material with the ZnS-ZnO shell-core structure grows on the interdigital conducting layer by adopting a hydrothermal method, the ZnO nano rod is prepared by adopting the hydrothermal method, and the ZnO surface is further converted into ZnS by adopting a vulcanization treatment by adopting the hydrothermal method. The sensor can be used for testing the content of thiophene sulfides in diesel oil, and the specific testing method comprises the following steps of connecting an external lead of the sensor with a digital bridge measuring instrument (LCR), placing the sensor into the diesel oil, and testing the capacitance change of the sensor in diesel oil samples with different benzothiophene concentrations, wherein the sensor is soaked in normal hexane solution to obtain a base line value after being connected with the LCR, and when the capacitance of the sensor is tested, the LCR tester is set to be 1V and the frequency is 10kHz. Compared with the prior art, the invention has the following advantages: 1. The zinc sulfide-zinc oxide shell core structure nano rod grows firmly on the sur