CN112142098A - Ag coated SnO2Preparation of SO2Method for sensing material - Google Patents
Ag coated SnO2Preparation of SO2Method for sensing material Download PDFInfo
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Abstract
The invention belongs to the technical field of semiconductor gas sensors and environment monitoring, and provides Ag-coated SnO2Preparation of SO2The method for preparing the sensitive material is to extract SnO from stannum mud2And carrying out Ag coating to prepare SO2A method for sensing a material. The invention carries out acid washing, water washing and oxidizing roasting on the tin mud to extract the tin dioxide in the tin mud. And depositing Ag nano particles on the surface of the tin dioxide serving as a matrix to prepare the sulfur dioxide sensitive material. Prepared SO2Gas sensor pair SO2The high-stability high-selectivity high-response-value and good stability, selectivity and response-recovery characteristics are shown. The recovery process of the tin dioxide adopted by the invention is simpleAnd the industrial mass production can be realized. More importantly, the used raw materials have low cost, the comprehensive utilization of resources is realized, and the method meets the aim of environment-friendly development. The prepared sulfur dioxide gas sensor has wide application prospect in the aspect of sulfur dioxide gas detection.
Description
Technical Field
The invention belongs to the technical field of metal oxide semiconductor-based gas sensors and environmental monitoring, and particularly relates to a method for purifying SnO (stannic oxide) by taking tin mud as a raw material2And carrying out Ag coating to prepare SO2A method for sensing a material.
Background
At present, with the improvement of the requirements of people on living environment, more and more people are dedicated to research and prepare sensitive materials capable of rapidly and accurately detecting toxic, harmful, flammable and explosive gases. Among them, the semiconductor tin dioxide has been widely noticed by domestic and foreign scholars due to its excellent physical and chemical properties and gas sensitivity. The gas-sensitive material taking the nano tin dioxide as the matrix has better detection performance on a plurality of harmful reducing gases. At present, the preparation method of the nano tin dioxide comprises a chemical precipitation method, a sol-gel method, a solvothermal method, a magnetron sputtering method and the like. However, these methods have problems in that raw materials and equipment are expensive, the yield is low, the production process is complicated, and the like. More seriously, as one of the most scarce minerals in the world, tin ore resources have failed to meet the increasing demand for tin resources. By 2016, the global tin reserves were 470 million tons, only 50% of the 1999 reserves. The current tin reserves can only guarantee the resource usage in the next 17 years according to the global tin resource consumption of 2016 (28 million tons). Because the resource collection and storage ratio of tin is very low, the tin resource will be more and more in short supply in the future. Therefore, research on recycling tin from the tin-containing secondary resource to reduce the waste of the tin resource and relieve the shortage of the tin resource has urgency and significance.
Tin sludge generated in the electrolytic tinning line is one of the most important secondary resources of tin. As an industrial waste, tin sludge is composed mainly of tin oxide and a small amount of metal sulfonate, wherein the content of tin oxide is as high as 90 wt.%. And the yield is huge, wherein the annual tin mud yield of one Chinese enterprise is 6000 tons. However, so far, tin sludge has been recycled as only an industrial waste for metallic tin extraction, and few researchers have studied high value-added recycling of tin sludge. Obviously, discarding tin sludge as industrial waste or performing metallic tin extraction as a tin-containing waste would result in severe loss of tin resources, as well as increase of enterprise costs and cause severe environmental pollution.
Based on the background, the patent researches the green recovery of tin oxide in tin mud, and researches the application of the tin oxide in a sulfur dioxide gas sensor with high added value by combining a modified preparation method of a gas sensitive material. It is well known that sulphur dioxide is one of the most serious atmospheric pollutants, and prolonged exposure to sulphur dioxide can lead to skin and eye damage, as well as lung damage and even lung failure, and ultimately even death. Sulfur dioxide is also one of the major gases responsible for acid rain, which can cause serious environmental damage. Therefore, accurate and rapid real-time monitoring and early warning of sulfur dioxide are of great significance to reducing harm caused by the sulfur dioxide. The method mainly takes the nano tin dioxide material recovered from the tin mud as a matrix, and carries out noble metal doping on the matrix so as to obtain more excellent sensitive characteristics. Noble metal doping can significantly improve the gas sensing performance of semiconducting metal oxides by increasing the active sites, as well as creating metal-oxide heterojunctions. The Ag-coated nano tin dioxide sensitive material is prepared by adopting an Ag nano particle coating method, and the prepared sensitive material has excellent response characteristic to sulfur dioxide.
Disclosure of Invention
In order to relieve the shortage of tin resources, reduce the waste of resources and reduce the cost of enterprises. The invention researches the green recovery of the industrial byproduct, namely the tin mud, generated in the tin plating industry, namely the high value-added recycling. The green recovery process of tin dioxide in tin mud comprises acid washing and oxidizing roasting. And coating the Ag nano particles on the tin dioxide nano particles to prepare the Ag-coated tin dioxide nano particles. The compound has high response value, good selectivity, stability and response-recovery characteristics when used for detecting sulfur dioxide.
The technical scheme adopted by the invention is as follows:
ag coated SnO2Preparation of SO2A method of sensing a material comprising the steps of:
step 1, purifying tin mud: adding original tin mud into 0.1-0.3 mol/L dilute hydrochloric acid at normal temperature, magnetically stirring for 2-6 h, centrifuging, precipitating, washing, drying, oxidizing and roasting at 400-600 ℃ for 1-3 h, and recovering to obtain SnO2A nanomaterial;
Further, the tin mud is a byproduct generated in the tin electroplating process, and is an industrial waste.
Further, the washing process is to wash the precipitate with deionized water and absolute ethyl alcohol respectively for three times.
Preferably, the drying process is carried out at 80 ℃ and the drying time is 12 h.
Preferably, the Ag coating process is KBH4By rapidly pouring the desired volume of 0.6mol/L of KBH directly into the solution4And (3) solution.
Preferably, the SnO2Nano-particlesThe particles are SnO with particle size of 5-12 nm2Irregular large particles formed by aggregating nano particles.
Another object of the present invention is to prepare a SnO coated with Ag nanoparticles2Nano material, SnO coated by Ag nano particles2The porous nanoparticles are SnO2The nano-particles are cores, and an Ag nano-particle shell is coated and grown on the surfaces of the nano-particles.
Further, said SnO2The porous nano particles are purified and then the soluble and volatile impurities in the original tin mud are removed.
The invention prepares SnO based on Ag coating2SO of nanoparticles2A gas sensor is prepared by the following steps,
SnO coating the above Ag2Mixing the nano particles and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate plated with an interdigital electrode, air-drying, and welding a working electrode and a heating electrode on a gas-sensitive element base to obtain SO2A gas sensor.
The invention relates to Ag-coated SnO prepared by extracting stannic oxide from stannic mud and coating the stannic oxide with Ag2The nanoparticle approach has the following advantages:
aiming at the problems of shortage and waste of the existing tin resources, the invention provides the method for extracting tin oxide with high added value from the tin secondary resources to relieve the shortage of the resources and reduce the environmental burden.
Secondly, the tin mud used in the invention is industrial waste generated in a tin plating process, and is not efficiently recycled at present, so that the waste of tin resources is caused. The green recycling process provided by the invention can effectively reduce the enterprise cost and realize the high value-added recycling of secondary resources.
The raw material (tin mud) used in the invention has low cost and simple extraction process, and can solve the problems of complex process, high raw material cost, low yield and the like in the existing preparation of tin dioxide. Can realize industrialized and mass production.
The Ag coating process provided by the invention can be used for preparing the tin dioxide particles with the surfaces uniformly coated with the Ag nano particles, is beneficial to increasing the specific surface area of the material and enriching the active sites on the surfaces.
The Ag coating process of the tin dioxide can effectively improve the sulfur dioxide sensitivity of the material. The effective monitoring of the sulfur dioxide is realized.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) photograph of Ag coated tin dioxide; (a) and (b) are different in size standard;
FIG. 2 shows a sulfur dioxide sensor for SO of different concentrations in comparative example and example 2 of the present invention2The response curve of the gas;
the response value S of the gas sensor is defined as: r ═ Sa/Rg，RaAnd RgThe resistance values of the interdigital electrodes when the sensor is in the air and the sulfur dioxide gas with certain concentration are respectively shown.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
Polyethylene glycol 400 is abbreviated as PEG-400.
Comparative example
Recovery of SnO from tin sludge2Preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.1mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; SnO2Mixing the nano particles and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and then welding an electrode to obtain the sulfur dioxide gas sensor.
Example 1
Recovery of SnO from tin sludge2And carrying out Ag coating to prepare SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.1mol/L dilute hydrochloric acid solution, and carrying out magnetic forceStirring for 4h, performing centrifugal separation, precipitation, washing and drying, and performing oxidizing roasting at 500 ℃ for 2h to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 2
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 3
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.3mol/L dilute hydrochloric acid solution, magnetically stirring for 4 hours, centrifugally separating, precipitating, washing and drying the obtained productOxidizing and roasting at 500 ℃ for 2h to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 4
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out 400 ℃ oxidizing roasting for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 5
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 600 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 6
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 1 hour to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 7
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 3 hours to obtain recovered SnO2A nanoparticle; removing silver nitrate, polyethylene glycolThe ratio of sub-water to water is 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 8
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.03: 10:50, 0.05g of silver nitrate, to which 1ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 9
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.08:10: a mass ratio of 50 is configured as a solution,wherein the addition amount of silver nitrate is 0.05g, and 3ml of 0.6mol L KBH is added into the above solution under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 10
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 400 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 11
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, wherein the amount of silver nitrate added is 0.05g, under magnetic stirringTo the above solution was added 2ml of 0.6mol L of KBH, respectively, with stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 500 ℃ for 1h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 12
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, 0.05g of silver nitrate, to which 2ml of 0.6mol L of KBH was added under magnetic stirring4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 0.5h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Example 13
Recovery of SnO from tin sludge2And carrying out Ag coating preparation of SO2A gas sensor.
Taking 10g of original tin mud to be put into 100ml of 0.2mol/L dilute hydrochloric acid solution, after magnetic stirring for 4 hours, centrifugally separating, precipitating, washing and drying, and then carrying out oxidizing roasting at 500 ℃ for 2 hours to obtain recovered SnO2A nanoparticle; mixing silver nitrate, polyethylene glycol and deionized water in a ratio of 0.05: 10:50, wherein the amount of silver nitrate added was 0.05g, and 2ml of 0.6mol was added to the above solutions under magnetic stirringKBH of L4The solution yielded a silver sol. 1g of SnO was further added to the silver sol2Magnetically stirring the nano particles for 2h, performing solid-liquid separation, washing and drying, and performing heat treatment at 450 ℃ for 1.5h to obtain SnO coated with Ag nano particles2A sensitive material; and mixing the sensitive material and deionized water according to the mass ratio of 1:1, grinding to prepare slurry, uniformly coating the slurry on a ceramic substrate, naturally drying, and carrying out electrode welding to obtain the sulfur dioxide gas sensor.
Claims (6)
1. Ag coated SnO2Preparation of SO2A method of sensing a material, comprising the steps of:
step 1, purifying tin mud: adding original tin mud into 0.1-0.3 mol/L dilute hydrochloric acid at normal temperature, magnetically stirring for 2-6 h, centrifuging, precipitating, washing, drying, oxidizing and roasting at 400-600 ℃ for 1-3 h, and recovering to obtain SnO2A nanomaterial;
step 2, Ag coating: preparing silver nitrate, polyethylene glycol and deionized water into a mixed solution, and adding KBH into the mixed solution under magnetic stirring4Obtaining silver sol from the solution, and adding SnO into the silver sol2Nanoparticles of silver nitrate, polyethylene glycol, deionized water, KBH4And SnO2The mass ratio of (A) to (B) is 0.03-0.08: 10:50: 0.03-0.09: 1; after magnetic stirring, solid-liquid separation, washing and drying, and heat treatment at 400-500 ℃ for 0.5-1.5 h to obtain SnO coated with Ag nano particles2Porous nanoparticles.
2. The method of claim 1, wherein the Ag coating process is KBH4By rapidly pouring the desired volume of 0.6mol/L of KBH directly into the solution4And (3) solution.
3. The method according to claim 1 or 2, wherein the drying is carried out at 80 ℃ for 12 hours.
4. The method according to claim 1 or 2, wherein the washing process comprises three washing times of the precipitate with deionized water and absolute ethanol, respectively.
5. The method of claim 1 or 2, wherein said SnO is2The nano-particles are SnO with the particle size of 5-12 nm2Irregular large particles formed by aggregating nano particles.
6. SO prepared by the process of any of claims 1 to 52Use of a sensitive material for the preparation of SO2Gas sensor, the sensor is of a flat plate structure and is made of Al2O3The substrate is used as a substrate, the front surface of the substrate is sputtered with interdigital gold electrodes in advance, the back surface of the substrate is coated with a high-temperature heating sheet, and SnO coated with Ag2The nano particles are gas sensitive materials coated on the front surface of the ceramic substrate.
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| CN113008946A (en) * | 2021-03-03 | 2021-06-22 | 南开大学 | Ag-doped SnO2Preparation method of gas-sensitive material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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