XRD analysis
The result of my XRD analysis showed stong bands at angles of 38.11, 44.38, 64.44, 76.57 and 82.12. This result reveals silver crystal formation which respectively corresponds to 111, 200, 220, 311 and 222 Bragg’s planes. but alwas I have unassigned band at 28 . 20. Why?
The undesirable peak are due to formation of side products as plant extract contains large number of compounds or may be due to crystallisation of plant extract
Dear Dr. K:
On the ResearchGate there is a set of papers at about the Ag0 synthesis with bio-inspiration, as an example;
https://www.researchgate.net/publication/280628468_BIOSYNTHESIS_OF_SILVER_NANOPARTICLES_USING_LATEX_OF_SYANDENIUM_GRANTII_HOOK_F_AND_ITS_ASSESSMENT_OF_ANTIBACTERIAL_ACTIVITIES
https://www.researchgate.net/publication/281237564_Titanium_Dioxide_Nanoparticles_Biosynthesis_for_Dye_Sensitized_Solar_Cells_application_Review
https://www.researchgate.net/publication/281952070_Silver_nanoparticles_biosynthesis_using_Spirulina_platensis_used_as_antioxidant_and_antimicrobial_agent
https://www.researchgate.net/publication/271528836_Biosynthesis_of_silver_nanoparticles_Biosynthesis_of_Silver_Nanoparticles_by_using_Marine_Bacteria_Vibrio_alginolyticus
If material was previously dried following DRX characterization, the extra diffraction line positioned two-theta equal to 28.20 can be associated to a salt.
In the question, there is small information at about, but supposing that the biosynthesis process adopted as a raw-precursor for Ag a sulphate. It is possible that sulphate groups was not "consumed". In the sequence, during Ago concetration procedure, this sulpahte groups undergone some kind of reaction with some cation of vegetable fluid, them during dry process this salt precipitate.
In this sense, being this salt present in a minor fraction, the diffraction line more evident is the diffraction line of 100%, that appears small due its small relative amount.
Then, a possibility is find a salt that has a diffraction line of 100% of relative intensity positioned at two-theta position equal to 28.20. There is a broad variety of cationic species in a typical sap compositions, but only few are present at significant concentrations, typically: Mg, K, Ca... In this sense, a salt of magnesium would be detected. Since, infrared of Ago is a classical spectrum, infrared of material characterized by DRX can also be investigated by infrared, that is proper to detect or exhibit the presence of radical groups as nitrate, sulphates in a clear way, etc...
Well, at end, verify the amount of sample characterized is in according to the recommendation in the diffractometer manual’s. At least two between several varieties of SiO2: quartz, amorphous glass...exhibits diffraction line and diffraction halo in the region of two theta equal to 28o. If the sample-holder is of one of these materials, the extra diffraction line stemming the “Quartz”. But, one another possibility is the extract contamination from long time milling of vegetable parts in a glass or agate mortar.
Best regards
Marcos Nobre
Article Biosynthesis of silver nanoparticles Biosynthesis of Silver ...
Article Biosynthesis of silver nanoparticles using latex of syandeni...
Article Titanium Dioxide Nanoparticles Biosynthesis for Dye Sensitiz...
Article Silver nanoparticles biosynthesis using Spirulina platensis ...
No dear dr. I don't think that FTIR can help for identify the nanparticles.
I think FTIR no need for our research.
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