Naked Science Forum
Non Life Sciences => Chemistry => Topic started by: Dr.IC on 04/03/2009 09:49:32
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Which acid reacts with Si.
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HF etches the oxide - used in glasswork. Is this what you meant?
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Which acid reacts with Si.
HF dissolve Si too, but only if it's not in crystalline form. In crystalline form no acid can attack it.
It can be attacked by hot, concentrated sodium or potassium hydroxide:
Si + 2OH- + H2O --> SiO32- + 2H2↑
Among gasses, F2 attacks it at cold, Cl2 and Br2 at 300°C, O2 at 400°C.
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Which acid reacts with Si.
Why do you ask?
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HF etches the oxide - used in glasswork. Is this what you meant?
its not SiO2, its Silicon cap in IC.
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Which acid reacts with Si.
HF dissolve Si too, but only if it's not in crystalline form. In crystalline form no acid can attack it.
It can be attacked by hot, concentrated sodium or potassium hydroxide:
Si + 2OH- + H2O --> SiO32- + 2H2↑
Among gasses, F2 attacks it at cold, Cl2 and Br2 at 300°C, O2 at 400°C.
thanks i will try this..
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Which acid reacts with Si.
Why do you ask?
i need to remove a Si cap which covers MEMS in an IC.
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how to prepare aqueous KOH solution.
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how to prepare aqueous KOH solution.
Dissolving KOH in water. Add little amounts of water to a fixed amount of KOH, till the water is slightly enough to dissolve it; in this way you have a concentrated solution. Remember that it should probably be hot and you will probably need some time for etching, but I'm not sure because I've never done this.
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how to prepare aqueous KOH solution.
Dissolving KOH in water. Add little amounts of water to a fixed amount of KOH, till the water is slightly enough to dissolve it; in this way you have a concentrated solution. Remember that it should probably be hot and you will probably need some time for etching, but I'm not sure because I've never done this.
thanks ..
i will try this..
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If you add a small amount of water to soild KOH it wil get very hot. Quite possible hot enough to boil and spatter the solution.
Since hot concentrated KOH solution is very corrosive I would advise that you do not do this.
Weigh out roughly equal amounts of KOH and ice. Put them both in the same beaker and stir carefully.
Gloves are a good idea and some sort of eye protection is a requirement. Also, if you are doing this with more than a few grams of material you really need to make sure you hev lots of fresh water to wash the stuff away if you spill it.
This stuff is a nasty corrosive mixture, remember that.
What are you actually trying to do? There may be an easier way.
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Also he shouldn't of course do it in a container that can be attacked from the strong alcali solution, for example glass.
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If you add a small amount of water to soild KOH it wil get very hot. Quite possible hot enough to boil and spatter the solution.
Since hot concentrated KOH solution is very corrosive I would advise that you do not do this.
Weigh out roughly equal amounts of KOH and ice. Put them both in the same beaker and stir carefully.
Gloves are a good idea and some sort of eye protection is a requirement. Also, if you are doing this with more than a few grams of material you really need to make sure you hev lots of fresh water to wash the stuff away if you spill it.
This stuff is a nasty corrosive mixture, remember that.
What are you actually trying to do? There may be an easier way.
I am trying to etch Si cap which is covering the MEMS on Integrated circuit.
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Hi guys
Thanks for your valuable suggestion, if u have some more suggestion, please reply to the post. [:)]
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What is organometallic compound?
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Any compound that contains a carbon-metal bond is a organometallic compound.
For example, chlorobenzene reacts with magnesium metal in ether to give phenylmagnesium chloride.
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Then molybdenum hexa carbonyl and tungsten hexa carbonyl is also a organometallic compound. what is the chemical properties of this compound.
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molybdenum hexa carbonyl and tungsten hexa carbonyl is also a organometallic compound. what is the chemical properties of this compound.
A recurring minor debate in some chemical circles concerns the definition of an "organometallic" compound. Usually, organometallic indicates the presence of a metal directly bonded via a M-C bond to an organic fragment, which must in turn have a C-H bond. By this strict definition, Mo(CO)6 is not organometallic.
http://en.wikipedia.org/wiki/Molybdenum_hexacarbonyl
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I don't know much about their properties so have a look at these links:
http://en.wikipedia.org/wiki/Molybdenum_hexacarbonyl
http://www.reciprocalnet.org/recipnet/showsamplebasic.jsp?sampleId=27344468
http://en.wikipedia.org/wiki/Tungsten_hexacarbonyl