2. The narrow scan B(1s) and N(1s) XPS spectra was acquired for a sample of crys

Question

2. The narrow scan B(1s) and N(1s) XPS spectra was acquired for a sample of crystalline BN. The spectra acquired before and after sputtering was performed with an Ar gun are shown in the diagram below. Assign all peaks to in spectra and explain the change in the spectra after sputtering. You will need to use the NIST online database (http://srdata.nist.gov/xps/) or a similar reference work. After 200eV Before sputteringAr*s B Is B Is 206 304 nding Energy (e N Is N Is 4124?????31 ding treno (0)6??392 412 410 Binding Energy (ev) Binding herge (er) Binding Energy (e

Explanation / Answer

Elemental Boron 1s has an experimental peak at approx. 186.4

Boron in BN has a peak around 190. Higher binding energy of Boron in this case suggests that Boron is bound to some electronegative element i.e. N.

Another peak at 192 corresponds to oxide on the surface. Since oxygen is more electronegative, so peak for Boron in this case is seen at higher binding energy.

So before sputtering Boron had two peaks due to N and O attachments. But after sputtering with Ar, oxygen contaminants is removed and only peak of BN is seen.

Similar is the case for N 1s . After sputtering, Nitrogen oxide from the surface is removed and only 1 peak is seen due to BN.

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