CN101570345A - Method for preparing SnO2 superfine powder - Google Patents
Method for preparing SnO2 superfine powder Download PDFInfo
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- CN101570345A CN101570345A CNA2009100721822A CN200910072182A CN101570345A CN 101570345 A CN101570345 A CN 101570345A CN A2009100721822 A CNA2009100721822 A CN A2009100721822A CN 200910072182 A CN200910072182 A CN 200910072182A CN 101570345 A CN101570345 A CN 101570345A
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- powder
- superfine powder
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- precipitate
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Abstract
The invention provides a method for preparing SnO2 superfine powder, which comprises: SnCl4 is completely dissolved in deionized water to form solution with mass ratio concentration of 35 percent, and weak aqua ammonia with mass ratio concentration of 28 percent is dropwise added and the PH value is adjusted to range from 2 to 3, thereby forming precipitate; the precipitate is repeatedly and uniformly stirred and then is cleaned, filtered and dried; after being ground, the precipitate is led into a muffle furnace; and after being sintered for 1 hour at 550 DEG C, the precipitate is ground into powder to obtain the SnO2 superfine powder material. The powder prepared by the invention has the advantages of small grain size and large specific surface area of the material, thereby showing higher sensitivity to low concentration gas.
Description
(1) technical field
The present invention relates to a kind of SnO
2The preparation method of superfine powder.
(2) background technology
SnO
2The demand of powder in the gas sensor industry is huge, and present preparation method mainly contains following three kinds: (1) directly prepares SnO by tin by burning or acid-treated method
2(2) be that raw material is through Processing of Preparation SnO such as high temperature sinterings with the stannic acid
2(3) muriate with tin is that raw material adopts chemical precipitation method to make Sn (OH)
4, prepare SnO through pyroprocessing again
2Obtain SnO in order to last method
2Face shaping and granularity not ideal enough, the gas-sensitive property of element is had very big influence.
(3) summary of the invention
The object of the present invention is to provide that a kind of to access powder grain size little, the material specific surface area is big, can present the SnO of higher sensitivity to light concentration gas
2A kind of SnO of superfine powdery material
2The preparation method of superfine powder.
The object of the present invention is achieved like this:
With SnCl
4Be dissolved in deionized water and make it to dissolve fully that to form quality be 35% solution than concentration, dripping quality then is 28% weak ammonia than concentration, adjusts pH value to 2-3, makes it to form and precipitates; Throw out is stirred, cleans, filters the back oven dry repeatedly, and grinding is placed in the retort furnace; 550 ℃ of sintering 1 hour, grind into powder obtained SnO again
2Superfine powdery material.
SnO
2The size of powder, coating of particles, homogeneity, stability all directly influence the important parameters such as sensitivity, power consumption, selectivity, response recovery characteristics and stability of gas sensor.Powder granule is more little, and the unit specific surface area of powder is big more, and activity is high more, and it is just high more to make element sensitivity thus, and power consumption is just low more, and response recovery time is short more.Defectives such as traditional preparation method exists that sample granularity is big, specific surface area is little, easy reunion, inhomogeneous and reaction time are long.The powder grain size of patent preparation of the present invention is little, and the material specific surface area is big, thereby can present higher sensitivity to light concentration gas.
(4) description of drawings
Accompanying drawing is the SnO that method of the present invention obtains
2The microanalysis photo of superfine powder (amplifying 100000 times).
(5) embodiment
For example the present invention is done in more detail below and describes:
Embodiment one: with SnCl
4Be dissolved in deionized water and make it to dissolve fully that to form quality be 35% solution than concentration, dripping quality then is 28% weak ammonia than concentration, adjusts pH value to 2-3, makes it to form and precipitates; Throw out is stirred, cleans, filters the back oven dry repeatedly, and grinding is placed in the retort furnace; 550 ℃ of sintering 1 hour, grind into powder obtained SnO again
2Superfine powdery material.
Embodiment two: present embodiment is on the basis of embodiment one, and pH value is selected 2.2-2.8.
Embodiment three: present embodiment is on the basis of embodiment two, and pH value is selected 2.4-2.6.
Embodiment four: present embodiment is on the basis of embodiment three, and pH value selects 2.5.
Claims (4)
1, a kind of SnO
2The preparation method of superfine powder is characterized in that: with SnCl
4Be dissolved in deionized water and make it to dissolve fully that to form quality be 35% solution than concentration, dripping quality then is 28% weak ammonia than concentration, adjusts pH value to 2-3, makes it to form and precipitates; Throw out is stirred, cleans, filters the back oven dry repeatedly, and grinding is placed in the retort furnace; 550 ℃ of sintering 1 hour, grind into powder obtained SnO again
2Superfine powdery material.
2, a kind of SnO according to claim 1
2The preparation method of superfine powder is characterized in that: described pH value is 2.2-2.8.
3, a kind of SnO according to claim 2
2The preparation method of superfine powder is characterized in that: pH value is 2.4-2.6.
4, a kind of SnO according to claim 3
2The preparation method of superfine powder is characterized in that: pH value is 2.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100721822A CN101570345A (en) | 2009-06-04 | 2009-06-04 | Method for preparing SnO2 superfine powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100721822A CN101570345A (en) | 2009-06-04 | 2009-06-04 | Method for preparing SnO2 superfine powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101570345A true CN101570345A (en) | 2009-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100721822A Pending CN101570345A (en) | 2009-06-04 | 2009-06-04 | Method for preparing SnO2 superfine powder |
Country Status (1)
| Country | Link |
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| CN (1) | CN101570345A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881122A (en) * | 2014-04-21 | 2014-06-25 | 河北科技大学 | Preparation method of polyvinyl chloride/nano-tin dioxide composite film with high visible light catalytic activity |
| CN105439555A (en) * | 2014-08-12 | 2016-03-30 | 中国科学院大连化学物理研究所 | High-specific-surface-area nano barium stannate preparation method |
-
2009
- 2009-06-04 CN CNA2009100721822A patent/CN101570345A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881122A (en) * | 2014-04-21 | 2014-06-25 | 河北科技大学 | Preparation method of polyvinyl chloride/nano-tin dioxide composite film with high visible light catalytic activity |
| CN103881122B (en) * | 2014-04-21 | 2016-08-17 | 河北科技大学 | The preparation method of the polyvinyl chloride/nano tin ash composite membrane of high visible light catalytic activity |
| CN105439555A (en) * | 2014-08-12 | 2016-03-30 | 中国科学院大连化学物理研究所 | High-specific-surface-area nano barium stannate preparation method |
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Open date: 20091104 |