A kind of pd/sno2 nanosphere and its preparation method and application

A technology of nanospheres and nanoparticles, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of complicated preparation steps, and achieve simple preparation process, high yield, and no need for heat treatment Effect

Active Publication Date: 2018-10-12
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the methods for preparing Pd / SnO2 composite materials are two-step methods, and the preparation steps are complicated.

Method used

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  • A kind of pd/sno2 nanosphere and its preparation method and application
  • A kind of pd/sno2 nanosphere and its preparation method and application
  • A kind of pd/sno2 nanosphere and its preparation method and application

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Embodiment 1

[0028] 1) Add 0.6 g SnCl 2 Dissolve it in 30 ml of deionized water containing 0.4 ml of 37% by mass, configure it as an aqueous solution of stannous chloride, and stir to obtain a transparent solution.

[0029] 2) Add 0.3ml of chloropalladium acid solution with a concentration of 10mg / ml to the above transparent solution dropwise, and stir at 80°C for 10h to obtain a brown suspension.

[0030] 3) The suspension was cooled, centrifuged, washed three times with distilled water and absolute ethanol respectively, and the obtained product was dried in a vacuum at 50°C to obtain Pd / SnO 2 nanospheres.

[0031] The Pd / SnO prepared above 2 The X-ray diffraction pattern of nanospheres is shown in Figure 1. The diffraction peaks are mainly tetragonal rutile phase tin oxide, and there is no obvious diffraction peak of Pd, mainly because the content of Pd is too low. The Pd / SnO prepared above 2 SEM image of the nanospheres (see Figure 2), from which it can be seen that the Pd / SnO 2 Th...

Embodiment 2

[0035] 1) Add 1 g SnCl 2 Dissolve it in 30 ml of deionized water containing 0.4 ml of 30% by mass, configure it as an aqueous solution of stannous chloride, and stir to obtain a transparent solution.

[0036] 2) Add 0.6ml of chloropalladium acid solution with a concentration of 10mg / ml to the above transparent solution dropwise, and stir at 80°C for 10h to obtain a brown suspension.

[0037] 3) The suspension was cooled, centrifuged, washed three times with distilled water and absolute ethanol respectively, and the obtained product was dried in a vacuum at 50°C to obtain Pd / SnO 2 nanospheres.

[0038] The Pd / SnO prepared above 2 The TEM image of the nanospheres is shown in Figure 4, from which it can be seen that the nanospheres are made of SnO 2 nanoparticles and Pd nanoparticles.

[0039] The above-prepared Pd / SnO 2 Nanospheres are used to detect methanol, triethylamine and ethanol gases. The prepared gas sensor has an optimum working temperature of 240°C for 100ppm of t...

Embodiment 3

[0042] 1) Add 1 g SnCl 2 Dissolve it in 30 ml of deionized water containing 0.4 ml of 30% by mass, configure it as an aqueous solution of stannous chloride, and stir to obtain a transparent solution.

[0043] 2) Add 0.6ml of chloropalladium acid solution with a concentration of 10mg / ml to the above transparent solution dropwise, and stir at 80°C for 10h to obtain a brown suspension.

[0044] 3) The suspension was cooled, centrifuged, washed three times with distilled water and absolute ethanol respectively, and the obtained product was dried in a vacuum at 50°C to obtain Pd / SnO 2 nanospheres.

[0045] The above-prepared Pd / SnO 2 Nanospheres are used to detect methanol, triethylamine and ethanol gases. The prepared gas sensor has an optimum working temperature of 240°C for 500ppm of three different gases, which is better than that of pure SnO 2 Lower 20°C. The sensitivities to the three detection gases at the optimum working temperature are 102.1, 106.8 and 104.5 respectiv...

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Abstract

The invention relates to Pd / SnO2 nanospheres as well as a preparation method and an application thereof. The nanospheres have uniform sizes and good dispersity. The nanospheres are prepared with a one-step thermostatic water bath evaporation method, a clear solution is obtained by adding anhydrous SnCl2 to an HCl solution, then, chloropalladic acid solutions in different proportions are added, the nucleation and growth speeds of Sn and Pd are regulated by adjusting the water bath temperature, Pd / SnO2 nanosphere precipitates are prepared, then, products are subjected to centrifugal separation, washing and drying, and the Pd / SnO2 nanospheres in uniform size can be obtained. The preparation process has the advantages as follows: (1) no templates or dispersants are used in the reaction process, and the experiment process is simple and low in cost; (2) no precious metal reductants are used, posttreatment is not required, and no pollution is caused to the environment; (3) the reaction condition is mild, no high-temperature and high-pressure conditions are used, and mass synthesis is easy to realize; (4) the products have uniform forms and good dispersity. The obtained Pd / SnO2 nanospheres have good application prospects in catalysis, air-sensitivity, lithium batteries and other fields.

Description

technical field [0001] The present invention relates to a kind of Pd / SnO 2 Nanospheres and their preparation methods and applications. Background technique [0002] Tin dioxide, a wide bandgap n-type semiconductor, Eg=3.65eV, is widely used in gas sensors, photocatalysis, lithium batteries and other fields, and is a research hotspot in the field of materials. At present, the methods for preparing tin oxide nanoparticles mainly include hydrothermal method, precipitation method, precursor decomposition method, electrospinning method and so on. Due to the large specific surface area and high surface energy in the preparation process of nanoparticles, the nanoparticles are easy to agglomerate, and the dispersion of nanoparticles is poor. Therefore, it is very important to find a suitable method to prepare nanoparticles with good dispersibility. [0003] SnO 2 The application of nanoparticles in photocatalysis, gas sensing, lithium batteries and other fields is the current Sn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02B01J23/62B01J35/08
CPCB01J23/626B01J35/08C01G19/02C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/52C01P2004/62C01P2004/64
Inventor 乔秀清李东升赵君侯东芳吴亚盘董文文
Owner CHINA THREE GORGES UNIV
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