Polyaniline were initially partially soluble in DI and DMSO at room temperature but sonication at 40 deg Celsius gives out dark green solution. I want to know how this solvent could affect the UV-Vis analysis.
Can we apply PL analysis for PANI sample.
Dear all, Polyaniline is NOT SOLUBLE at all in any solvent. The dark green clear colour is due to the presence of nanoscopically dispersed PAni particles; in case can visually detect particles (by eye or by microscope), then your dispersion is not perfect.
I have shown why PAni can not be soluble, but instead of it can be made nicely dispersible:
https://www.researchgate.net/publication/253651172_Conductive_Polymers_as_Organic_Nanometals
https://www.researchgate.net/publication/229428580_Conductive_Polymer__Solvent_systems_solutions_or_dispersions(Can_conductive_polymers_form_true_solutions)httpwww.organic-nanometal.dewww2ResearchSynthmetcontent.html
The effect of DMSO on UV-VIS spectrum will be that you get nicer absorption peaks, less noisy base line, but no shift in peak wavelength.
For more details about spectra, you can have a look here:
https://www.researchgate.net/publication/49593603_New_Insight_into_Organic_Metal_Polyaniline_Morphology_and_Structure?ev=prf_pub
Chapter Conductive Polymers as Organic Nanometals
Chapter Conductive Polymer / Solvent systems: solutions or dispersio...
Article New Insight into Organic Metal Polyaniline Morphology and Structure
Doped polyaniline is partially soluble in DMSO. The dark green solution formed upon sonication contains very finely dispersed particles. It is better to centrifuge the solution after sonication and use the only partial solution portion for UV-VIS.
Thank you, Mr.S.Bhandari, i am grateful to you kind advice and I will make you that you are 100% correct in observation part.
What the difference we would expect if we carry UV-Vis study with different solvent like DI and DMSO,
and second thing can we use PL study also to know different energy exchange level in the material.
Thanks
Polyaniline is les soluble in DI compared to DMSO. Thus, in DI solution it will show less absorption or more transmittance. I am not very much sure about PL from such dispersion. Polyaniline can be dispersed in any low b.p. solvent e.g. THF or acetone and cast dropwise on glass slide to make uniformly dispersed particle (it will look like film) prior to do PL.
Dear all, Polyaniline is NOT SOLUBLE at all in any solvent. The dark green clear colour is due to the presence of nanoscopically dispersed PAni particles; in case can visually detect particles (by eye or by microscope), then your dispersion is not perfect.
I have shown why PAni can not be soluble, but instead of it can be made nicely dispersible:
https://www.researchgate.net/publication/253651172_Conductive_Polymers_as_Organic_Nanometals
https://www.researchgate.net/publication/229428580_Conductive_Polymer__Solvent_systems_solutions_or_dispersions(Can_conductive_polymers_form_true_solutions)httpwww.organic-nanometal.dewww2ResearchSynthmetcontent.html
The effect of DMSO on UV-VIS spectrum will be that you get nicer absorption peaks, less noisy base line, but no shift in peak wavelength.
For more details about spectra, you can have a look here:
https://www.researchgate.net/publication/49593603_New_Insight_into_Organic_Metal_Polyaniline_Morphology_and_Structure?ev=prf_pub
Chapter Conductive Polymers as Organic Nanometals
Chapter Conductive Polymer / Solvent systems: solutions or dispersio...
Article New Insight into Organic Metal Polyaniline Morphology and Structure
Bernhard Wessling , its great Sir, I am really benefited by your answer, you explained as well as send me very useful link.
Thank you ....worthful for all young researcher
Dear Saurav,
Concerning your question: I copied it below:
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Polyaniline were initially partially soluble in DI and DMSO at room temperature but sonication at 40 deg Celsius gives out dark green solution.
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you give polyaniline without specification and company and structure e.g polymerisation degree and , very important , about purity of it.
Presence of impurities will affect and falsify your results.
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I want to know how this solvent could affect the UV-Vis analysis
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UVVis analysis :
Please avoid the SHORT CUT DI and give the full name.
DMSO is very hygroscopic and must destilled only under vacuum and dried . The cut off of DMSO is important for your UV-Vis spectrum analysis too.
What a kind of spectrometer are you using (single, dual or arrays)?
According to Bernhard et other answerers you must investigate the degree and aspect of dispersion because it is important when you use single or dual beam spectrometer.
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Can we apply PL analysis for PANI sample?
If you want to apply PL e.g Photoluminescence:for the analysis, you must investigate the QUALITY and ASPECT of your FILM .
On other part, it is useful to take a PL spectrum at room temp. and another spectra at various low temperature. You can see perhaps a variation of the shape e.g. structure of your spectrum.
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About solvents and PANi :
this link is interesting :
https://www.google.com/patents/EP2190285A1?cl=en&dq=difference+between+aniline+black++and+PANi&hl=de&sa=X&ei=ae4AU4TLN8uRswbZ2IAo&ved=0CDUQ6AEwADgK
Good luck
JRG
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