x-ray photoelectron spectroscopy (xps)€¦ · a result of released energy due to atom from higher...
TRANSCRIPT
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X-ray Photoelectron Spectroscopy (XPS)
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Contents
WHAT is XPS?
HOW does it work? An
in-depth look at each
component of the
instrument
WHERE can this
technique be applied?
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WHAT is XPS?
https://slideplayer.com/slide/13488710/
• Quantitative surface analysis technique
• Provides spatial distribution information
via mapping or depth profiling
• Binding energy is measured giving
information on the origin of the
photoelectron
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HOW does this instrument work?
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Applications: Elemental
composition in wide scans
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A result of released
energy due to atom
from higher energy
level filling gap of
emitted electron
from same
Laura Trapiella-Alfonso, Fanny D’Orlye, Philani Mashazi, Anne Varenne*, Tebello Nyokong. Physical and in-solution characterisation of graphitic carbon nitride, graphene and nitrogen-doped graphene quantum dots*, work in progress
![Page 7: X-ray Photoelectron Spectroscopy (XPS)€¦ · A result of released energy due to atom from higher energy level filling gap of emitted electron from same Laura Trapiella-Alfonso,](https://reader033.vdocument.in/reader033/viewer/2022042212/5eb4958a5a45414de06c7722/html5/thumbnails/7.jpg)
S.R Nxele, T. Nyokong, Conjugation of Azide-functionalised CdSe/ZnS Quantum Dots with Tetrakis(5-hexyn-oxy) Fe(II)
phthalocyanine via Click Chemistry for Electrocatalysis, Electrochim. Acta 194 (2016) 26-39.
1200 1000 800 600 400 200 0
Inte
nsi
ty (
cps)
Binding Energy (eV)
Bare GCP
N(1s)
Zn(2p)
S(2p)
Se(3d)
GSH-capped QDs
N(1s)Cd(3d)
Cd(3d)
Azide-QDs
Fe(2p) N(1s)
C(1s)
O(1s)
clicked FePc-QDs
Analysis done on glassy carbon plates
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Applications: Elemental
composition and bond-types in
high resolution scans
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Physical characterisation: XPS N1s/C1s high
resolution scans & RNH/COOH values
GQDs
0
2
4
6
8
10
12
280282284286288290292
Inte
ns
ity (
x 1
03
cp
s)
Binding energy (eV)
C 1s
0
1
2
3
4
5
6
7
396398400402404
Inte
ns
ity (
x1
03
cp
s)
Binding Energy (eV)
N 1s
Element Binding energy (eV) Peak assignment
C1s 287.5 COOH
286.2 C-O
284.8 C=O
283.9 C=N
N1s 400.9 NH
402.1 NC=O
399.3 N=C
397.4 C-N-C
RNH/COOH = 0.20
9Laura Trapiella-Alfonso, Fanny D’Orlye, Philani Mashazi, Anne Varenne*, Tebello Nyokong. Physical and in-solution characterisation of graphitic carbon nitride, graphene and nitrogen-doped graphene quantum dots*, work in
progress
![Page 10: X-ray Photoelectron Spectroscopy (XPS)€¦ · A result of released energy due to atom from higher energy level filling gap of emitted electron from same Laura Trapiella-Alfonso,](https://reader033.vdocument.in/reader033/viewer/2022042212/5eb4958a5a45414de06c7722/html5/thumbnails/10.jpg)
Physical characterisation: XPS N1s/C1s high
resolution scans & RNH/COOH values
GQDs
0,0
0,5
1,0
1,5
2,0
2,5
280282284286288290292
Inte
ns
ity (
x 1
04
cp
s)
Binding Energy (eV)
C 1s
0
0,4
0,8
1,2
1,6
2
396398400402404
Inte
ns
ity (
10
3c
ps
)
Binding Energy (eV)
N 1s
Element Binding energy (eV) Peak assignment
C1s
288.4 COOH
286.8 C-O
284.9 C=N
N1s
401.1 NH
399.4 N=C
398.1 C-N-C
RNH/COOH = 0.0410
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Physical characterisation: XPS N1s/C1s high
resolution scans & RNH/COOH values
GQDs
Element Binding energy (eV) Peak assignment
C1s 288.6 COOH
287.2 C=O
285.8 C-O
284.7 C=N
283.4 C-C
N1s 402.4 N-C=O
401.1 N-H
399.2 N=C
398.4 C-N-C
RNH/COOH = 0.4511
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12
390 392 394 396 398 400 402 404 406 408 410
Inte
nsit
y (
cp
s)
Binding Energy (eV)
Azide QDs
Clicked FePc-QDs
405.5
404.6
399.6
399.4
N=N+=N
-
N=N+=N
-
S.R Nxele, T. Nyokong, Conjugation of Azide-functionalised CdSe/ZnS Quantum Dots with Tetrakis(5-hexyn-oxy) Fe(II)
phthalocyanine via Click Chemistry for Electrocatalysis, Electrochim. Acta 194 (2016) 26-39.
![Page 13: X-ray Photoelectron Spectroscopy (XPS)€¦ · A result of released energy due to atom from higher energy level filling gap of emitted electron from same Laura Trapiella-Alfonso,](https://reader033.vdocument.in/reader033/viewer/2022042212/5eb4958a5a45414de06c7722/html5/thumbnails/13.jpg)
13
David O. Oluwolea*, Sello L. Manotob, Patience Mthunzi-Kufab and Tebello Nyokong, Evaluation of the
Photophysicochemical Properties and Photodynamic Therapy of Zinc Phthalocyanine–Metallic Nanoparticles
Conjugates
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Final remarks
XPS is one of the best techniques to characterize molecules and
determine their elemental composition
It also is good for determining bonds formed between molecules
It is also a useful technique as it gives quantitative data or
information
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