advanced nanoscale ir spectroscopy and applications webinar · 2019-05-29 · webinar – advanced...
TRANSCRIPT
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Advanced nanoscale IR spectroscopy and Applications Webinar
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Professor Alexandre Dazzi, University Paris-Sud, Orsay France
Advanced nanoscale IR spectroscopy and Applications Webinar May 21st
Dr Curtis Marcott Light Light Solutions
Webinar – Advanced AFM-IR Techniques and Applications
Presenter Host & Moderator
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Bruker Nano Acquires Anasys Instruments
• Bruker Nano Surfaces Division acquired Anasys Instruments Corp on April 10th 2018
• All nanoIR products are now integrated into the Bruker Nano Product Support
Webinar – Advanced AFM-IR Techniques and Applications
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The leader in nanoscale IR spectroscopy
• History of patented technology for nanoscale IR spectroscopy & materials property mapping
• Ernst Abbe award for Alex Dazzi - Inventor of AFM-IR
nanoIR™ 1st Generation
AFM-IR
nanoIR2™ 2nd Generation AFM-IR
Top Down Configuration & Resonance Enhanced
nanoIR2-s™ Combined
IR s-SNOM & AFM-IR
nanoIR2-FS™ 3RD Generation FASTspectra
2010 2014 2015 2016 2017
Tapping AFM-IR HYPERspectra
NEW nanoIR3™
Latest Generation nanoIR platform with
Tapping AFM-IR
2018
4 Webinar – Advanced AFM-IR Techniques and Applications
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NEW nanoIR3 platform configurations
nanoIR3-s™ High Performance IR nano-spectroscopy
• Complementary sSNOM & Tapping AFM-IR • Highest Performance IR nano-spectroscopy • Broadband Spectroscopy & Chemical Imaging • Nanoscale property mapping • Versatility & Easy to Use
nanoIR3™ - Latest Generation nanoIR platform with Tapping AFM-IR
• Highest performance nanoIR spectra with AFM-IR • Sub-10nm resolution IR chemical imaging with Tapping AFM-IR • Correlates to FTIR & industry databases • Easy to use for fast, productive measurements
S-SNOM imaging Phase and Amplitude on
HbN Plasmonic Imaging on Graphene with
Tapping AFM-IR & s-SNOM
nanoIR Spectroscopy of Polyethersulphone (PES)
5 Webinar – Advanced AFM-IR Techniques and Applications
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Organic nano Contaminants
Polymer blends & Block Copolymers
Multilayer films Nanofibers
Nano-Composites
Broad range of nanoIR applications
+ + +
Perovskites &
Solar Cells nanoIR spectra
2D Materials/Graphene
Life Science
Webinar – Advanced AFM-IR Techniques and Applications
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European Forum on Nanoscale IR Spectroscopy University of Amsterdam, Sept 11-12th
Co-hosted by University of Amsterdam & Bruker
Webinar – Advanced AFM-IR Techniques and Applications
Select Key Speakers
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AFM-IR : Advanced nanoscale IR
spectroscopy and Applications
Alexandre Dazzi
Laboratoire de chimie physique
Université Paris-Sud
Bruker Webinar 21st May 2019
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Introduction
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AFM-IR technique
AFM IR laser
AFM-IR
Infrared spectroscopy and imaging at nanoscale
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AFM-IR technique and microscope evolution
• 2005 : Birth of the technique in UPSud
• 2007 : Patent with Anasys Instruments
• 2010 : 1st commercial microscope
The nanoIR1
• 2012 : nanoIR2
• 2014 : nanoIR2s
• 2018 : nanoIR3
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NanoIR platform at U-Psud
NanoIR2 NanoIR1
NanoIR2s
AFM-IR TEAM
Ariane Deniset-Besseau Dominique Bazin
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Accumulation of biopolymer
or lipids
Localisation and quantification
Local composition, TAG, DAG,
MAG and FFA differentiation
MICRO-ORGANISMS
Nanoparticules and cell:
macrophage
Calcification in human tissues
Extracellular vesicles
Penetration of nanocarriers
Fine structure of the hair…
TISSUE – Human cells
Protein assemblies
Collagen fibrils denaturation
System complex: Collagen-
antibiotic
NANOMETRIC SCALE
Bacterial amyloids
Beta structure of amyloids
Prion, lipids bilayer
Field of applications - Biology
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- IR signatures: heterogeneities in
ancient tissues or violin sections
Heritage sciences Polymers sciences
- Polymeric Nps
Nanoparticles
Field of applications
- Investigate
parchments
degradation
Trace of adjuvant blooming
- Investigation of
organic matter in
micrometeorites
Astrochemistry
Multilayers:
Structure-cristallinity
Mathurin J., 10.1039/C8AN01239C, Analyst, 2018
A Dazzi, International journal of pharmaceutics
Volume 484, Issues 1–2, 2015 J. Mathurin, A&A, 2019
G.Latour, Scientific Report, 2016 A Dazzi, Chem Rev, 2016
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Technique principle
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Nanoscale IR spectroscopy
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topography Chemical mapping (l=5,76µm)
Nanoscale IR spectroscopy
- Absorption Spectrum (fix tip position and scan the wavelength of the laser)
Wavenumber (cm-1)
- Chemical mapping (fix the laser wavelength and scan the surface with the tip)
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Theoretical concept of AFM-IR
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Basic principle of spectroscopy :
Iincident Itransmitted
Ireflected
(Beer-Lambert law)
Extinction coefficient
Absorbance
Transmission coefficient
d
n
Infrared spectroscopy
Wavenumber (cm-1)
Absorbance spectrum
Str. C-H asym and sym (CH2)
Str. C-H of aromatic
Str. of aromatic ring C=C
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Laser Illumination
0 tp t
IR Pulse
a sphere radius
V volume
n refractive index
Absorbed power:
if a <<
Photothermal effect and spectroscopy
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Weak absorption
ni << nr
Heat Equation:
density, C heat capacity, k thermal conductivity
w0
nr
w0
ni
0
1.5 10-2
10-2
Photothermal effect and spectroscopy
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Temperature behavior of the sphere (a <<
with and
Only for tp <<
relax
Tmax
t tp 0
Photothermal effect and spectroscopy
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Thermoelastic effect
IR Pulse a
da
T
da(t)
a=
1+n
1-n
asph
3T(t)
a0 =1+n
1-n
a
3asphTmax =
1+n
1-n
aasphPabstp
3rsphCsphVµAbsorbance
asph thermal expansion coefficient
n Poisson coefficient
a0
t tp 0
Photoacoustic effect and spectroscopy
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z
x
0
L
H
EI¶4z
¶x4+ rA
¶2z
¶t 2+ k
¶z
¶t= 0
E Young modulus, I inertial momentum, r density, A section, k Cantilever damping
kz
kx
kz >> kc NO indentation
Motion equation of the cantilever
L length, H tip height,
kx lateral stiffness, ky normal stiffness
kc =3EI
L3with kc cantilever stiffness :
Detection by AFM
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Eigenvalues equation :
-1+ cosX coshX -UX(sinX coshX - cosX sinhX) = 0
U =kcL
2
3kxH2,X = bLwith
kx 0 (slipping) ∞ (pinned)
Mode Xn=bnL Xn=bnL
0 3.92662 4.73004
1 7.06858 7.8532
2 10.3518 14.1372
Si Cantilever in contact
Mode 0
AFM-IR, a new tool for nanoscale IR spectroscopy
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AFM-IR, a new tool for nanoscale IR spectroscopy
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EI¶ 4z
¶x4+ rA
¶ 2z
¶t2+k
¶z
¶t= S(x,t)
Solution expression of the cantilever motion :
Motion equation with external excitation
with S(x,t) external excitation
Excitation expression for a photothermal expansion :
a0
L L-∆x
Detection by AFM
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AFM-IR Technique
Classic measurement
Laser shoot
modes
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AFM-IR and spectroscopy
Polystyrene
Photothermal approach gives a direct
measurement of the Imaginary part of the index
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Resonance Enhanced mode
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Cantilever
deflection
detection
Contact
Resonance
Demonstrated by Pr. Belkin team in 2011 (Opt. Express)
Sensitivity limit 2-5 nm
Resonance enhanced AFM-IR
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Resonance Enhanced Mode
Deflection signal
laser signal
Resonance enhanced AFM-IR
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Forced resonance makes AFM-IR more sensitive
Laser repetition rate
Resonance enhanced AFM-IR
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Deflection expression for 1 single pulse (OPO)
Deflection expression when the repetition rate = contact resonance (QCL)
Resonance enhanced AFM-IR
Amplitude(Z) thermal expansion(a0) absorbance µ µ
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Improving the sensitivity and resolution…
Bacteriorhodopsin protein
Detected inside a purple membrane
1660 cm-1
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Tapping AFM-IR
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IMAGING MODE IN AFM
CONTACT
MODE
TAPPING
MODE
AFM image
AFM image
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Heterodyne force detection M.T. Cuberes et al J.Phys.D:Appl.Phys. 2000
Z1(t)=A1 cos(w1t)
Zs(t)=As cos(wst)
Z2(t)=A2 cos(w2t+f2) Non linear interaction : w2=wp+w1
or w2=wp-w1
Zp(t)=Ap cos(wpt)
Tapping AFM-IR
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Tapping AFM-IR
Tapping AFM-IR configuration
Z1(t)=A1 cos(2pf1t)
Zs(t)=u0(t) * S d(t-n/fp
f1= Driving frequency of the tapping mode
fp = repetition rate of the QCL laser
Z2(t)=A2 cos(2pf2t+f2)
Non linear interaction : f2=f1+fp
D
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Tapping AFM-IR
Motion equation of the second mode f2 :
Fts(t) = ks A1 cos(w1t)-D-u0(t)( ) + cs A1 cos(w1t)-D-u0(t)( )2
+...
f1 fp 2f1
2fp
Fts(t) = -2c s A1 cos(2p f1t)P(t )* d(t -m / f1)m
åæ
èç
ö
ø÷ u0(t)* d(t -n / fp )
n
åæ
èç
ö
ø÷
t is the time of contact driven by the f1
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Tapping AFM-IR
Fourier Transform of equation :
ff2
T( f )
f1 + fpf2 = f1 + fp
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Tapping AFM-IR
Amplitude of the second mode f2
Thermal expansion
α Absorbance
Non linear elasticity contact coefficient
Setpoint
Laser pulse
Cantilever parameters
Driving amplitude
Tapping AFM-IR signal is proportional to absorbance
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Tapping AFM-IR
Comparison between
Tapping AFM-IR spectrum
and FTIR spectrum
Height IR Image at 1730 cm-1
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Sub-10nm chemical Imaging & Monolayer Sensitivity with Tapping AFM-IR
Block Co-polymer
(a) AFM-IR spectra of various locations on a monolayer bacterial membrane
(b) Tapping AFM-IR collected at the amide 1 band showing variations in protein orientation due to the polarization dependent absorption of the incident light
(c) Profile cross section highlighting achieved spatial resolution, 4nm
Monolayer Sensitivity
Chemical characterization of PS-P2VP block co-polymer sample by Tapping AFM-IR (a) Tapping AFM height image. (b) Tapping AFM-IR spectra clearly identifying each chemical
component. (c) Tapping AFM-IR overlay image highlighting both components
(PS@ 1492 and P2VP@ 1588). (d) Profile cross section highlighting the achievable spatial
resolution, 10 nm. Sample courtesy of Dr. Gilles Pecastaings and Antoine Segolene at University of Bordeaux
44 Webinar – Advanced AFM-IR Techniques and Applications
Tapping AFM-IR
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Polymeric NPs for drug delivery
FTIR spectra of products
PLA
PLGA antibiotic
PVA
Antibiotic = pipemidic acid
(coll. R.Gref, ISMO, U-Psud France)
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Polymeric NPs for drug delivery
PLA/PVA nanoparticle
AFM-IR contact mode Tapping AFM-IR
Mapping at 1760 cm-1 center on ester carbonyl band of PLA
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Polymeric NPs for drug delivery
PLA/PVA nanoparticle
Mapping at 1425 cm-1 center on absorption band of PVA
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Polymeric NPs for drug delivery
PLGA/PVA nanoparticles with antibiotic
topography
@1640 cm-1
@1425 cm-1
@1415 cm-1
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CORRELATIVE IMAGING
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AFM-IR and Fluorescence analysis of NPs
IR absorption at 1770cm-1
10 µm
AFM topography
AFM-IR chemical mapping of fixed macrophage
Fluo imaging
E.Pancani et al. Part. Part. syst. Charact 2018
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D.Partouche et al. J. Microsc. 2019
AFM-IR and TEM analysis of Hfq fibrils
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@1710 cm-1 @1600 cm-1 @1460 cm-1
J.Mathurin et al. A&A 2018
AFM-IR and SEM-EDX analysis of UCAMMs
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Conclusion
AFM-IR is the only technique allowing to have a direct
measurement of the Imaginary part of the refractive
index. Leading to reliable spectra and comparable to
FTIR.
Tapping AFM-IR is a big improvement that allows to
study new kind of samples (soft, non adhesive).
Resolution expected to be better than tapping as it is a
nonlinear interaction (down to 10 nm).
Open to correlative imaging
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Thanks to
AFM-IR team:
A.Deniset-Besseau
D.Bazin
J.Mathurin
J.Waytens
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QUESTIONS
www.Bruker.com/nanoIR
Webinar – Advanced AFM-IR Techniques and Applications
nanoIR3-s™ Latest Generation
nanoIR platform with Tapping AFM-IR & Scattering SNOM
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