I got a peak at below 38 (around 36) for Ag. can anyone help with the interpretation?

More Uzair Hashmi's questions See All

Do you think Biological synthesis of Nanoparticles can meet upto physical and chemical methods of nanoparticles synthesis?

I m doing my MS in Industrial biotechnology and my research areas are fabrication of nanoparticles from natural sources ( Plants, microorganisms). Biological method for synthesis is an emerging...

04 May 2015 6,715 0 View

How do you measure quantum yield of fluorescence of nanoparticles from fluorescence microscopy image?

09 October 2014 5,308 3 View

How do you relate linear dynamic range with quantitative proteomics?

I am trying to understand the concept of linear dynamic range in quantitative proteomic. As I am a beginner in Proteomics. How the dynamic range is related with the fluorescent dye for 2DE?

09 October 2014 5,598 1 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Can we block unwanted images during the x-ray prediction?

i am try to classify the x-ray images. During classification , can i block unwanted images (except x-ray image).

03 March 2021 7,100 1 View

I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

02 March 2021 1,787 2 View

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

How to compare different concentrations of nanoparticles for characterization from ICP-MS?

I took measurements of different concentrations of 15 nm and 5 nm Au nano particle solutions. I'm trying to determine which concentration I measured gives the best reading overall. I also...

02 March 2021 7,626 1 View

Can chitosan alone can act as a reducing agent for Cu(0) nanoparticle sythesis?

[Synthesizing Cu nanoparticles without using chemical reductants]

01 March 2021 8,359 1 View

What are the new 2D nanomaterials were used for Silver nanoparticles stabilization?

In the stabilization of AgNPs are vital in current research interest. However, some of the 2D nano-materials like graphene oxide, MoS2, etc... previously used to stabilize it. But still they shown...

01 March 2021 2,207 3 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

Does anyone know to clarify these changes?

01 March 2021 1,290 2 View

How to check the uv-vis absorption of nanoparticle by surface plasmon resonance?

I try to check the uv-vis absorption of Indium nanoparticle. Now I am measuring in solution, can I measure it in the form of a film?

01 March 2021 930 3 View

Atilla Atli

I beleived that it is the XRD diffractogram !!!

What is your sample? Are you sure that it is silver ? metallic? oxide?

Uzair Hashmi

The nano particles have been synthesized from algal extracts. i am expecting metallic silver nano particles.

Robert Anthony Roggers

I mean, what are we looking at, obviously the axis are labeled intensity and 2*theta, so it is a pXRD pattern. But what is the compound that is being analyzed? Is it supposed to be bulk metallic silver, silver nanoparticles, silver oxide? I mean, to be honest, it doesn't really look like any silver I've encountered before (but that does not mean that it is not a silver compound).

i have prepared silver nanoparticles from algal extracts. After UV-vis analysis of the dispersion silver peak was indicated and the size was further confirmed by SEM. the dispersion for XRD was lyophilized prior to perform the XRD. so i am expecting the nanosilver crystals. There ofcousre exists the possibility of the oxidation of silver atoms (Metallic Silver) into its oxide..

i am unable to interpret what has gone wrong. and i need help. the Peak is close to that of metallic Silver but is not at the exact position which is confusing to me

@Atilla yes the compound is Silver .. as indicated from XRF and EDX analysis. i am expecting metallic silver. but it may be oxide. this is where i am stuck , weather it is metallic silver nanoparticles of Silver Oxide.

Daniel L. Starnes

A similar question has been asked previously about something like this:

https://www.researchgate.net/post/In_XRD_of_silver_nanoparticles_what_does_the_2theta_value_at_32_degree_mean_How_to_interpret_it

You may want to take some of your sample and use TEM and EDX (not perfect) but may help resolve what could be causing your issue. Given that you using an alga extract I have a feeling that your Ag-NPs are being coated with something in the preparation step that is making you Ag-NPs have more irregular crystal structures. Also are you sure that you are looking at true nano-Ag? Depending on your prep, media, and so on, AgNPs can be very unstable (especially uncoated/non-functionalized).

You may want to TGA some of you sample.

Good luck.

Lawrence Margulies

two theta doesn't mean much unless you give the x-ray energy. Better to convert it to d-spacing to try to identify what kind of unit cell could have such a d-spacing.

Donato E. Conte

Dear Uzair,

this XRD has definitely something wrong. From the online free database (http://rruff.geo.arizona.edu/AMS/amcsd.php), it's a little bit outdated but it works for simple elements, I found the following:

-AgO has a 100% intensity peak at 32 2theta

-Ag2O has a 100% intensity peak at 33 2theta

-Ag has a 100% intensity peak at 38 2theta

so far NONE of these peaks belong to your diffractogram OR they are wildly shifted. Besides, you never have the enlargement typical of nanomaterials.

My guess would be:

-you are looking at the sample holder alloy

-you are wildly out of focus during measurement (generally the height of the sample) so your peaks shift a lot

-you did not measure enough powder (so you basically see only the sample holder)

By the way, what Lawrence suggests might be a good solution to solve the problem.

Think about it.

D. Fruchart

Do you know this recent paper

International Journal of Metals

Volume 2014 (2014), Article ID 692643, 8 pages

http://dx.doi.org/10.1155/2014/692643

Algae Mediated Green Fabrication of Silver Nanoparticles and Examination of Its Antifungal Activity against Clinical Pathogens

Shanmugam Rajeshkumar, Chelladurai Malarkodi, Kanniah Paulkumar, Mahendran Vanaja, Gnanadas Gnanajobitha, and Gurusamy Annadurai

Environmental Nanotechnology Division, Sri Paramakalyani Centre for Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamilnadu 627412, India

The authors check for the possble presence of AgNO3 that can be involved during the synthesis method.

No only the used XRD, but also FTIR, UV, SEM, TEM, pH etc analyses..

Can you process similar investigations?

Best regards

Daniel

Biserka Grzeta

Please perform XRD measurement of the empty sample holder (without sample) for comparison. Also, please provide an information about the anode material of your X-ray tube. Diffraction lines in your present XRD pattern are narrow, so they do not belong to nano particles.

Regards, Biserka