Maria Magro

11 Questions 46 Answers 0 Followers

Questions related from Maria Magro

Can one calculate the number of layers from an (001) XRD reflection peak?

I am using the Scherrer's equation to determine the crystallite size of graphene oxide using the main (001) reflection peak from XRD characterisation. From papers I've read it shows that the (002)...

02 December 2024 8,805 3 View

How can one measure a molar ratio of two elements from XPS data?

I need to calculate the N/C molar ratio from my XPS data of two polymers. I need to confirm whether the calculation is carried out using data from Survey spectra or High-resolution spectra of N 1s...

02 November 2024 8,026 2 View

Why at% concentration of C from C1s peak fitting is not the same as the at% concentration measured from survey spectrum?

This question is about the XPS quantification of commercial polyurethane foam. I performed peak fitting of C1s of polyurethane foam. The C at% concentration from the peak fit relative to the...

24 October 2024 609 7 View

How can one be sure that a correct XPS peak fitting is achieved?

Hello, I would like to see what your opinion is on how one decides if a C 1s peak or O 1s peak are fitted correctly, i.e. with the correct choice of backgrounds and line-shapes. I know that with...

04 August 2020 3,222 13 View

Which supplier do you suggest to buy highly pure Ag, Au, and Cu foils for the calibration of energy scales in XPS?

Hi, I would like to calibrate the energy scales of our XPS system, and would like to receive recommendations of suppliers that sell highly pure Ag, Au and Cu foils (thickness greater than 20...

17 February 2020 5,023 5 View

Why am I not seeing any Au peaks in an XPS spectrum?

I tried do an XPS scan of a silicon wafer covered with gold, however, the spectrum does not show any gold peaks. I tried to vary several parameters, including Epass, sample position, and even...

23 January 2019 9,053 6 View

Can I use a Si wafer and spin coat it with graphene or graphene oxide for XPS analysis?

Is it possible to spin coat a Silicon wafer with a suspension of graphene or graphene oxide to carry out XPS, AFM, and SEM characterisations? Are there any protocols that show the ideal rpm value...

02 July 2018 5,341 8 View

Best substrate for XPS characterisation of graphene and graphene oxide?

What is the best substrate for the XPS characterisation of graphene and graphene oxide? I will be using mostly the Al Ka radiation (hm = 1486.6 eV) to irradiate the samples, however not limited...

04 May 2018 5,458 3 View

Anyone familiar with Kovats Indices or RI for Essential Oil Identification?

Hi, I am trying to extract and identify the composition of essential oils from hemp inflorescences. I have to run an alkane mixture, but the one available at the lab is from C16-C40. Do you...

21 July 2015 8,543 14 View

How can one be sure that all of the solvent after soxhlet extraction is removed completely?

I am using acetone and heptane for separate soxhlet extractions, then evaporate the solvent under vacuum. However, once evaporation is complete I can still detect the solvent smell, so it is...

01 June 2015 2,414 7 View

Polymer XPS Database

Any XPS experts here can recommend from where I can buy and get hold of a copy of High Resolution XPS of Organic Polymers the Scientia ESCA300 Database of G. Beamson and D. Briggs (Wiley,...

01 January 1970 575 9 View