CN115015328B - N-amyl alcohol gas sensor based on PtAu alloy nanocrystalline modified flower-shaped WO3 sensitive material and preparation method thereof - Google Patents
N-amyl alcohol gas sensor based on PtAu alloy nanocrystalline modified flower-shaped WO3 sensitive material and preparation method thereof Download PDFInfo
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Abstract
Flower-shaped WO (WO) based on PtAu alloy nanocrystalline modification 3 N-amyl alcohol gas sensor of sensitive material and its preparing process, which belongs to semiconductor metal oxidationAn object gas sensor technology field. In the invention, ptAu alloy nanocrystalline is synthesized by oleylamine, and flower-shaped WO 3 The PtAu alloy nanocrystalline is prepared by a simple hydrothermal method and is loaded to flower-shaped WO by an impregnation method 3 Preparing PtAu alloy nanocrystalline modified flower-shaped WO on the surface 3 Sensitive material. The sensor is made of Al with gold electrode on the surface 2 O 3 The ceramic tube, the coated sensitive material and the Cr-Ni alloy heating wire. The n-amyl alcohol sensor has excellent gas-sensitive performance, and test results show that the response of the sensor to 20ppm n-amyl alcohol gas can reach 161.7, and the response speed is only 1s. In addition, the sensor has good selectivity to n-amyl alcohol. The sensor is expected to realize the rapid detection of the n-amyl alcohol gas.
Description
Technical Field
The invention belongs to the technical field of semiconductor metal oxide gas sensors, and particularly relates to a flower-shaped WO based on PtAu alloy nanocrystalline modification 3 An n-amyl alcohol gas sensor of sensitive material and a preparation method thereof.
Background
Environmental pollution and health damage from Volatile Organic Compounds (VOCs) emissions have attracted considerable attention over the past decades. N-pentanol, a colorless, odorless flammable liquid, is one of the most representative volatile organic compounds, which has a wide range of use scenarios, including for perfume production, medicine and biofuel. When n-amyl alcohol vapor volatilizes into the surrounding environment, it not only severely contaminates the air, but also poses a health hazard to the human body, such as irritating the skin and eyes of humans, damaging the respiratory system and causing headache and nausea when n-amyl alcohol concentration exceeds 15.6 ppm. In order to protect human health and monitor air pollution, it is important to accurately and timely detect n-amyl alcohol in the environment. Common methods for detecting n-pentanol mainly include gas chromatography-mass spectrometry and fluorescence spectrometry. Although they have low detection limits and high accuracy, the detection instruments have large volumes, high energy consumption and long detection periods, thereby limiting their application in air quality monitoring and environmental protection. Compared with them, semiconductor Metal Oxide (MOS) -based gas sensors have been widely studied and paid attention to because of their low cost, small size, environmental friendliness, ease of manufacture, and real-time on-line monitoring.
In all MOS materials, flower-like WO 3 Is a typical n-type semiconductor, and is an excellent candidate material for detecting n-amyl alcohol due to low cost, good stability, high electron mobility and good gas sensitivity. Because the carbon chain of n-amyl alcohol is long and the relative molecular weight is large, the n-amyl alcohol gas sensor based on pure MOS generally has the problems of unsatisfactory response, low recovery speed and the like. Many studies have shown that noble metal surface modification is an effective method for improving sensing performance. Noble metal Pt is widely applied to the field of gas sensitivity due to its excellent catalytic performance, and researches show that Pt can promote response, accelerate response speed and reduce working temperature. Au is also reported as another commonly used noble metal element to enhance the gas-sensitive properties to VOCs. Therefore, the bimetal alloy nanocrystalline formed by Pt and Au is expected to be capable of improving the response to n-amyl alcohol, improving the response speed and the recovery characteristics of the sensor.
Disclosure of Invention
The invention aims to provide a flower-shaped WO based on PtAu alloy nanocrystalline modification 3 An n-amyl alcohol gas sensor of sensitive material and a preparation method thereof.
Flower-like WO modified by PtAu alloy nanocrystalline 3 As a sensitive material, ptAu alloy nanocrystals overflows to WO after dissociating oxygen molecules 3 The surface can greatly increase the surface adsorbed oxygen content, which promotes the redox reactions that occur at the surface of the sensitive material. In addition, since Pt (5.65 eV) and Au (5.1 eV) have work functions greater than WO 3 (4.56 eV), so WO 3 The electrons of the (E) are lost to PtAu alloy nano particles, and the process not only ensures WO 3 The expansion of the depletion layer also increases the electron density on the surface of PtAu nano particles so as to strengthen the capturing capability of oxygenIs beneficial to improving the gas-sensitive response when detecting the n-amyl alcohol gas. The invention adopts a commercially available tubular structure sensor, has simple manufacturing process and small volume, is beneficial to industrial mass production, and has important application value.
Flower-shaped WO based on PtAu alloy nanocrystalline modification 3 An n-amyl alcohol gas sensor of sensitive material is prepared from Al with two parallel, annular and separated Au electrodes on its surface 2 O 3 Ceramic tube, sensitive material coated on Au electrode and outer surface of ceramic tube and positioned on Al 2 O 3 The inner part of the ceramic tube is composed of Cr-Ni alloy heating wires for providing temperature for sensitive materials; the method is characterized in that: the sensitive material is PtAu alloy nanocrystalline modified flower-shaped WO 3 The sensitive material is prepared by the following steps:
(1) H was added at 1.035mL and 0.05g/mL 2 PtCl 6 ·6H 2 O aqueous solution and 0.783mL, 0.05g/mL AuCl 3 ·3H 2 Uniformly mixing O aqueous solution and uniformly carrying out ultrasonic treatment, adding 9-10 mL of oleylamine and 1-2 mL of oleic acid by a liquid-transferring gun, stirring at 50-60 ℃ for 0.5-2.0 h, heating to 140-150 ℃ at the speed of 1.5-3.0 ℃/min, and reducing for 0.5-2.0 h under the protection of nitrogen; after cooling to room temperature, centrifugally washing the obtained product with a mixed solution of normal hexane and ethanol for 2-4 times, and dispersing the obtained PtAu alloy nanocrystalline into normal hexane to obtain PtAu alloy nanocrystalline colloid, wherein the concentration of the PtAu alloy nanocrystalline is 6.61mg/mL; the concentration calculation method of PtAu alloy nanocrystalline comprises the following steps: dripping 0.3-0.5 mL of PtAu alloy nanocrystals dispersed in n-hexane onto a clean glass sheet, drying, measuring the quality difference before and after the glass sheet to obtain the quality of PtAu alloy nanocrystals, and dividing the quality of PtAu alloy nanocrystals by the volume of a solution dripped onto the glass sheet to obtain the concentration of PtAu alloy nanocrystals;
(2) 0.336 g of P123 (polyoxyethylene-polyoxypropylene-polyoxyethylene, purchased from China medicine group) is dissolved in a mixed solution of 50-60 mL of absolute ethanol and 0.5-1 mL of water, and is vigorously stirred for 30-50 minutes (800-1200 rpm), and 1.332g of WCl is added into the mixed solution under continuous stirring 6 Until a clear yellow transparent solution was formed; transferring the clarified solution into a polytetrafluoroethylene reaction kettle, and keeping the temperature at 140-160 ℃ for 3-5 hours; after the reaction is cooled to room temperature, centrifugally collecting the precipitate, and alternately washing the precipitate with deionized water and ethanol for 4-6 times; finally, the precipitate is dried overnight at 50-70 ℃, and then annealed for 1.5-3.0 hours in the air at 350-450 ℃ to obtain the flower-like WO 3 A powder;
(3) 100mg of flower-like WO 3 Adding the powder into 15-30 mL of n-hexane, and performing ultrasonic dispersion for 20-40 minutes to obtain WO 3 A dispersion; then 0.015-0.106 mL PtAu alloy nanocrystalline colloid is added into WO 3 Ultrasonic treatment is carried out for 20 to 40 minutes in the dispersion liquid; finally, drying at 60-80 ℃ for 3-4 hours to evaporate n-hexane, thereby obtaining the PtAu alloy nanocrystalline modified WO 3 Sensitive material (PtAu-WO) 3 )。
The flower-shaped WO based on PtAu alloy nanocrystalline modification 3 The preparation method of the n-amyl alcohol sensor of the sensitive material comprises the following steps:
(1) Flower-shaped WO (WO) modified by 50-100 mg PtAu alloy nanocrystalline 3 Mixing the sensitive material with 0.05-0.1 mL absolute ethyl alcohol, and carrying out ultrasonic treatment for 10-20 minutes to uniformly disperse the sensitive material to obtain slurry; the paste is dipped by a brush and uniformly coated on the outer surface with two parallel, annular and separated Au electrodes of Al 2 O 3 The outer surface of the ceramic tube is provided with a sensitive material layer with the thickness of 30-40 mu m, so that the sensitive material completely covers the gold electrode;
(2) Al obtained in the step (1) 2 O 3 Calcining the ceramic tube at 180-220 ℃ for 1.5-3.0 h to fix the sensitive material layer thereon; then the Cr-Ni alloy heating wire with the resistance value of 30 to 40 omega passes through Al 2 O 3 Finally, the ceramic tube is welded on the hexagonal base according to a side heating type gas sensor, thereby obtaining the flower-shaped WO based on PtAu alloy nanocrystalline modification 3 N-amyl alcohol sensor of sensitive material.
Al 2 O 3 The ceramic tube has a length of 4.0-4.5 mm, an outer diameter of 1.0-1.5 mm, and an inner diameter of 0.7-1.0 mm. Au electricThe width of the electrode is 0.3-0.6 mm, and the interval between the two Au electrodes is 2.0-2.5 mm.
Flower-shaped WO based on PtAu alloy nanocrystalline modification prepared by the invention 3 The n-amyl alcohol gas sensor of the sensitive material has the following advantages:
1. PtAu alloy nanocrystalline is synthesized by using an oleylamine co-reduction method, and WO is synthesized by using a solvothermal method 3 A main body material, finally PtAu alloy nanocrystalline is loaded on WO by an immersion method 3 The surface is made into sensitive materials, and the synthetic method is economical and simple;
2. the chemical sensitization of PtAu alloy nanocrystalline greatly improves WO 3 Adsorbed oxygen content of the surface, WO due to work function difference 3 The loss of electrons of (2) further expands WO 3 The thickness of the depletion layer on the surface is greatly improved, so that the response of the depletion layer to the n-amyl alcohol gas is greatly improved;
3. flower-shaped WO modified by PtAu alloy nanocrystalline 3 The sensitive material shows high response and ultra-fast response speed to 20ppm n-amyl alcohol at 200 ℃;
4. the ceramic tube type sensor structure is adopted, the volume is small, the process is simple, and mass production can be realized.
Drawings
Fig. 1: flower-shaped WO based on PtAu alloy nanocrystalline modification 3 Sensitive materials (PtAu-WO) 3 ) A structural schematic diagram of the n-amyl alcohol gas sensor;
fig. 2: (a) A TEM image of a PtAu alloy nanocrystal, (b) an XRD image of a PtAu alloy nanocrystal;
fig. 3: (a) Pure WO 3 (b) PtAu-WO 3 SEM images of (a);
fig. 4: flower-like WO 3 Flower-shaped WO modified by PtAu alloy nanocrystalline 3 (PtAu-WO 3 ) An XRD pattern of (b);
fig. 5: (a) Pure WO 3 Dynamic response curve at 200℃for 20ppm n-pentanol, (b) PtAu-WO 3 A dynamic response curve for 20ppm n-pentanol at 200 ℃;
fig. 6: pure WO 3 At 200℃and PtAu-WO 3 Response to 1-20 ppm n-pentanol at 200 DEG CA curve;
fig. 7: pure WO 3 And PtAu-WO 3 A graph of selectivity for different interfering gases at 200 ℃.
As shown in FIG. 1, flower-like WO based on PtAu alloy nanocrystalline modification 3 The structure of the n-amyl alcohol gas sensor of the sensitive material comprises a hexagonal base, a ceramic tube, the sensitive material, an Au electrode and a Cr-Ni heating wire; the two gold electrodes and the Cr-Ni heating wire are welded on the hexagonal base through Pt wire leads, the sensitive material is coated on the outer surfaces of the ceramic tube and the gold electrodes, and the Cr-Ni heating wire penetrates through the inside of the ceramic tube.
As shown in fig. 2a, it can be seen that the nanocrystals are pseudo-spherical, with a size of about 5 nm; fig. 2b shows that the nanocrystals are platinum phase, and that the 2 theta shift of the PtAu alloy is low compared to the XRD of Pt, indicating that the lattice of Au doped with Pt increases the lattice parameter.
As shown in FIG. 3, a flower-like WO can be seen from FIG. 3a 3 Is in the order of micrometers and is assembled from a plurality of nano-sheets. FIG. 3b shows that PtAu alloy nanocrystalline loaded on WO 3 The method has no influence, and the morphology is unchanged before and after loading.
As shown in FIG. 4, pure WO 3 And PtAu modified WO 3 The XRD peak position and peak intensity of the alloy hardly change, which shows that after PtAu alloy nanocrystalline is introduced, WO 3 No change in lattice parameter occurs.
As shown in FIG. 5, it can be seen from comparative example (a) and example (b) that the resistance was reduced when the sensor was exposed to n-amyl alcohol gas, whereas PtAu alloy modified WO 3 The reduction is more remarkable, the response speed is remarkably improved, and the time is shortened to 1s. When the sensor is placed in an air atmosphere, the resistance values can return to the initial state. Pure WO 3 And PtAu modified WO 3 The working temperature is 200 ℃ and is unchanged.
As shown in FIG. 6, the responsiveness of the comparative example and the example to 1 to 20ppm n-pentanol increases with increasing concentration, ptAu-modified WO 3 The responsivity of (C) is greater than that of pure WO at each concentration 3 The response to 20ppm n-amyl alcohol gas can reach 161.7, and the response has good linear relation.
As can be seen from FIG. 7, ptAu modified WO 3 Good selectivity was shown for 20ppm n-pentanol.
Note that: the responsivity of the sensor is defined as the resistance in air between two gold electrodes (R a ) And the resistance value (R) in n-amyl alcohol g ) The ratio is S=R a /R g . During the test, a static test system is used for testing. The device is placed in a 1L air chamber, a certain amount of n-amyl alcohol gas is injected inwards, the resistance change is observed and recorded, and the corresponding responsivity value is obtained through calculation.
Detailed Description
Comparative example 1:
in the shape of flower WO 3 The sensitive material is used for manufacturing the n-amyl alcohol gas sensor, and the specific manufacturing process is as follows:
1. 0.336 g of P123 (polyoxyethylene-polyoxypropylene-polyoxyethylene) was dissolved in a mixed solution of 54.8mL of absolute ethanol and 0.5mL of water, vigorously stirred for 40 minutes, and then 1.332g of WCl was added to the solution with continuous stirring 6 Until a clear yellow transparent solution formed.
2. The clear solution was transferred to a polytetrafluoroethylene reaction vessel which was maintained at 150℃for 4 hours. After the reaction is cooled to room temperature, the precipitate is collected by centrifugation and is alternately washed with deionized water and absolute ethyl alcohol for 5 times. Finally, the precipitate was dried in an oven at 60℃overnight and annealed in air at 400℃for 2 hours to give a flower-like WO 3 Sensitive material powder.
3. 50mg of flower-like WO 3 The sensitive material powder was mixed with 0.1mL of absolute ethanol and sonicated uniformly, and then the brush dipped slurry was uniformly coated on Al with two parallel, annular and discrete gold electrodes 2 O 3 The surface of the ceramic tube is provided with a sensitive material which completely covers the gold electrode, and the thickness of the sensitive material is 35 mu m.
4. Al is added with 2 O 3 Calcining the ceramic tube at 200 ℃ for 2 hours to fix the sensing layer thereon; then the Cr-Ni alloy heating wire with the resistance value of 35 omega is passed through Al 2 O 3 Inside the ceramic tube, the ceramic tube is finally heated by the bypass type gasThe sensor element is welded to a hexagonal base, thereby obtaining a pattern-based WO 3 N-amyl alcohol sensor of sensitive material.
5. The sensitivity of the sensor to n-amyl alcohol was tested at 200 ℃.
Example 1:
flower-shaped WO based on PtAu alloy nanocrystalline modification 3 The specific manufacturing process of the n-amyl alcohol gas sensor of the sensitive material is as follows:
1. h was added at 1.035mL and 0.05g/mL 2 PtCl 6 ·6H 2 O aqueous solution and 0.783mL, 0.05g/mL AuCl 3 ·3H 2 The O aqueous solution is uniformly mixed and ultrasonically homogenized. Subsequently, the uniformly mixed solution was transferred to a three-necked flask, 9.5mL of oleylamine and 1.5mL of oleic acid were added by a pipette and stirred at 60℃for 1 hour, then heated to 150℃at 2℃per minute, and finally reduced under a nitrogen blanket for 1 hour. After cooling, the obtained product is collected, centrifugally washed for 3 times by using a mixed solution of normal hexane and absolute ethyl alcohol, and then the obtained PtAu alloy nanocrystalline is dispersed into normal hexane to obtain PtAu alloy nanocrystalline colloid. The concentration calculation method of PtAu alloy nanocrystalline comprises the following steps: and (3) dripping 0.3mL of PtAu alloy nanocrystals dispersed in n-hexane onto a clean glass sheet, drying, measuring the mass difference before and after the glass sheet to obtain the mass of PtAu alloy nanocrystals, and dividing the mass of PtAu alloy nanocrystals by the volume of a solution dripped onto the glass sheet to obtain the concentration of PtAu alloy nanocrystals of 6.61mg/mL.
2. 0.336 g of P123 (polyoxyethylene-polyoxypropylene-polyoxyethylene) was dissolved in a mixed solution of 54.8mL of absolute ethanol and 0.5mL of water, vigorously stirred for 40 minutes, and then 1.332g of WCl was added to the solution with continuous stirring 6 Until a clear yellow transparent solution formed. Thereafter, the clarified solution was transferred to a polytetrafluoroethylene reaction vessel which was maintained at 150℃for 4 hours. After the reaction is cooled to room temperature, the precipitate is collected by centrifugation and is alternately washed with deionized water and absolute ethyl alcohol for 5 times. Finally, the precipitate was dried in an oven at 60℃overnight and annealed in air at 400℃for 2 hours to give a flower-like WO 3 Sensitive material powder.
3. 100mg of flower-like WO 3 Adding the sensitive material powder into 20mL of normal hexane, performing ultrasonic treatment for 30 minutes, and adding 0.0756mL of PtAu alloy nanocrystalline colloid into the dispersed flower-shaped WO 3 In (3) ultrasonic treatment for 30 minutes. Finally, ptAu modified WO is obtained by centrifugation and drying at 60℃for 8 hours 3 A sensitive material.
4. WO modified by 50mg PtAu alloy nanocrystalline 3 The sensitive material of the micrometer flower is mixed with 0.1mL of absolute ethyl alcohol, and is dispersed evenly by ultrasonic for 10 minutes to obtain slurry, and then the slurry is dipped by a brush and is evenly coated on Al with two parallel and separated gold electrodes 2 O 3 The surface of the ceramic tube enables the sensitive material to completely cover the gold electrode; the thickness of the sensitive material was 35 μm.
5. Al is added with 2 O 3 Calcining the ceramic tube at 200 ℃ for 2 hours to fix the sensing layer thereon; then the Cr-Ni alloy heating wire with the resistance value of 35 omega is passed through Al 2 O 3 Finally, the ceramic tube is welded on a hexagonal base according to a side heating type gas sensor, thereby obtaining the flower-shaped WO based on PtAu alloy nanocrystalline modification 3 N-amyl alcohol sensor of sensitive material.
6. Testing PtAu alloy nanocrystalline modified flower-like WO at 200 DEG C 3 The sensor of the sensitive material is responsive to the gas sensitivity of n-amyl alcohol.
Claims (3)
1. Flower-shaped WO (WO) based on PtAu alloy nanocrystalline modification 3 An n-amyl alcohol sensor of sensitive material is prepared from Al with two parallel, annular and separated Au electrodes on its surface 2 O 3 Ceramic tube, sensitive material coated on Au electrode and outer surface of ceramic tube and positioned on Al 2 O 3 The inner part of the ceramic tube is composed of Cr-Ni alloy heating wires for providing temperature for sensitive materials; the method is characterized in that: WO with PtAu alloy nanocrystalline modification as sensitive material 3 The micron flower sensitive material is prepared by the following steps,
(1) H was added at 1.035mL and 0.05g/mL 2 PtCl 6 ·6H 2 O aqueous solution and 0.783mL, 0.05g/mL AuCl 3 ·3H 2 Uniformly mixing O aqueous solution and uniformly carrying out ultrasonic treatment, adding 9-10 mL of oleylamine and 1-2 mL of oleic acid by a liquid-transferring gun, stirring at 50-60 ℃ for 0.5-2.0 h, heating to 140-150 ℃ at the speed of 1.5-3.0 ℃/min, and reducing for 0.5-2.0 h under the protection of nitrogen; after cooling to room temperature, centrifugally washing the obtained product with a mixed solution of normal hexane and ethanol for 2-4 times, and dispersing the obtained PtAu alloy nanocrystalline into normal hexane to obtain PtAu alloy nanocrystalline colloid, wherein the concentration of the PtAu alloy nanocrystalline is 6.61mg/mL;
(2) Dissolving 0.334g of polyoxyethylene-polyoxypropylene-polyoxyethylene in a mixed solution of 50-60 mL of absolute ethanol and 0.5-1 mL of water, vigorously stirring for 30-50 minutes, and adding 1.332g of WCl to the mixed solution under continuous stirring 6 Until a clear yellow transparent solution was formed; transferring the clarified solution into a polytetrafluoroethylene reaction kettle, and keeping the temperature at 140-160 ℃ for 3-5 hours; after the reaction is cooled to room temperature, centrifugally collecting the precipitate, and alternately washing the precipitate with deionized water and ethanol for 4-6 times; finally, the precipitate is dried overnight at 50-70 ℃, and then annealed for 1.5-3.0 hours in the air at 350-450 ℃ to obtain the flower-like WO 3 A powder;
(3) 100mg of flower-like WO 3 Adding the powder into 15-30 mL of n-hexane, and performing ultrasonic dispersion for 20-40 minutes to obtain WO 3 A dispersion; then 0.015-0.106 mL PtAu alloy nanocrystalline colloid is added into WO 3 Ultrasonic treatment is carried out for 20 to 40 minutes in the dispersion liquid; finally, drying at 60-80 ℃ for 3-4 hours to evaporate n-hexane, thereby obtaining the PtAu alloy nanocrystalline modified WO 3 A sensitive material.
2. Flower-like WO based on a nanocrystalline modification of PtAu alloy as claimed in claim 1 3 An n-amyl alcohol sensor of sensitive material, characterized in that: al (Al) 2 O 3 The length of the ceramic tube is 4.0-4.5 mm, the outer diameter is 1.0-1.5 mm, and the inner diameter is 0.7-1.0 mm;
the width of the Au electrode is 0.3-0.6 mm, and the interval between the two Au electrodes is 2.0-2.5 mm.
3. Weight(s)Flower-like WO based on nanocrystalline modification of PtAu alloy as claimed in claim 1 or 2 3 The preparation method of the n-amyl alcohol gas sensor of the sensitive material comprises the following steps:
(1) Flower-shaped WO (WO) modified by 50-100 mg PtAu alloy nanocrystalline 3 Mixing the sensitive material with 0.05-0.1 mL absolute ethyl alcohol, and carrying out ultrasonic treatment for 10-20 minutes to uniformly disperse the sensitive material to obtain slurry; the paste is dipped by a brush and uniformly coated on the outer surface with two parallel, annular and separated Au electrodes of Al 2 O 3 The outer surface of the ceramic tube is provided with a sensitive material layer with the thickness of 30-40 mu m, so that the sensitive material completely covers the gold electrode;
(2) Al obtained in the step (1) 2 O 3 Calcining the ceramic tube at 180-220 ℃ for 1.5-3.0 h to fix the sensitive material layer thereon; then the Cr-Ni alloy heating wire with the resistance value of 30 to 40 omega passes through Al 2 O 3 Finally, the ceramic tube is welded on the hexagonal base according to a side heating type gas sensor, thereby obtaining the flower-shaped WO based on PtAu alloy nanocrystalline modification 3 N-amyl alcohol sensor of sensitive material.
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| CN105891272A (en) * | 2016-04-12 | 2016-08-24 | 吉林大学 | N-butanol gas sensor based on mesoporous WO3 material supporting precious metal Au and preparation method of n-butanol gas sensor |
| CN108956715A (en) * | 2018-07-19 | 2018-12-07 | 东北大学 | A kind of Au@WO3Core-shell nanospheres and its preparation method and application |
| CN110993967A (en) * | 2020-01-08 | 2020-04-10 | 济南大学 | CeO supported by Pt-Ni binary alloy2Nanoparticles and method for preparing same |
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| CN105891272A (en) * | 2016-04-12 | 2016-08-24 | 吉林大学 | N-butanol gas sensor based on mesoporous WO3 material supporting precious metal Au and preparation method of n-butanol gas sensor |
| CN108956715A (en) * | 2018-07-19 | 2018-12-07 | 东北大学 | A kind of Au@WO3Core-shell nanospheres and its preparation method and application |
| CN110993967A (en) * | 2020-01-08 | 2020-04-10 | 济南大学 | CeO supported by Pt-Ni binary alloy2Nanoparticles and method for preparing same |
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