Nanochemistry lab: Production and nanoscale ... · Nanochemistry lab: Production and nanoscale...
Transcript of Nanochemistry lab: Production and nanoscale ... · Nanochemistry lab: Production and nanoscale...
Nanochemistry lab:Production and nanoscale characterization
of new materials
Andrea Liscio
COFFEE TALKS @ ISOF
2012, July 2nd
COFFEE TALKS @ ISOF
Project Management Future?
Mophological-electronic characterization of supramolecular structures
Donor-acceptor blends, dielectrics for OFET
Scanning Probe Microscopies(AFM, EFM, KPFM)
Tip-sample interactionsWork Function, HOMO-LUMO
Charge injection(CNR ISOF, Bologna)
Physico-chemical characterization of Surfaces and Interfaces
Advanced Electron SpectroscopiesElectronic correlation in solid state physics
(CNR IMAI-IMIP-ISC, Montelibretti)
COFFEE TALKS @ ISOF
Pre-ISOF years Surface and interface electronic states (2D systems)
Exponential decay
Surface statesMatching the two behaviours
Bloch electrons
Surface crystallographic quality: LEED, RHEELSSurface dielectric behaviours: REELS, ILEEDElectronic surface states: UPS, XPS, AugerElectron density: (e,2e), (, +e), (,2e)
Surface: Bulk-vacuum interface
COFFEE TALKS @ ISOF
Pre-ISOF years Surface and interface electronic states (2D systems)
0.0 0.5 1.0 1.5 2.0-20-18-16-14-12-10-8-6-4-202
E B (eV
)
q// (Å-1)
3
2
1
L
•
Reconstruction of the electronic bands at surface•
Direct measurement of the
surface momentum density:
2ke
Electron wavefunction “deformation” due to the presence of adsorbate
molecules at surface
COFFEE TALKS @ ISOF
ISOF years Scanning Probe Microscopies (AFM, EFM, KPFM...)
V. Palermo, M. Palma and P. Samorì,
Adv. Mater. (Review Article) 2006,
18, 145-164A. Liscio, V. Palermo
and
P. Samorì, Acc. Chem. Res. 2010, 43, 541-550
AFM setup
• Metals • Semiconductors • Thin insulators
Morphology &Work Function (charge density)simultaneously
ISOF years Scanning Probe Microscopies (AFM, EFM, KPFM...)
Fully description of the SPM measurement
• Theoretical description of tip-sample interaction,
• Quantitative definition of the lateral resolution: effective area
• Quantitative analysis of the acquired image:
Artifacts
Roughnesss
Surface Potential
Charge density
Key point: The measured objects may be smaller than the size of the used probe
COFFEE TALKS @ ISOF
Transfer function representation
zrW
zrrzrr
zr
,,
lim,//
2////
0,//////
surface
meas zdzrSPzrrrdrSP0
//0//////// ,,
E electric fieldW electrostatic energy
Liscio
et
al., Adv. Funct. Mater. 16, (2006), 1407,
Liscio et al., Adv. Funct. Mater. 18,
(2008),
907,
Liscio et al., J. Phys. Chem. C 112, (2008), 173698,
Liscio et al., Acc. Chem. Res. 43, (2010), 541, Liscio et al., Small 7, (2011), 634
?Real Potential Image Measured Potential Image
COFFEE TALKS @ ISOF
COFFEE TALKS @ ISOF
Quasi 1D-systems:P3HT nanofibres on HOPG
Merlo
J.A. et
al., J. Phys. Chem. 108
(2004), 19169
Poly-3-hexylthiophene (P3HT)
200 nm 200 nm 200 nm
Topography Measured KPFM Simulated
KPFM
Z range = 10 nm Z range = 180 mV Z range = 180 mV
-1 0 1 2 3 4 5 6 7-200
-150
-100
-50
0
50
SP
(mV)
length (m)
1 m 1 m
A. Liscio, G. De Luca, F. Nolde, V. Palermo, K. Müllen, P. Samorì,
JACS 2008, 130, 780-781
Z range = 60 mV
N
O
O
N
O
O
Acceptor (PDI)
AFM KPFM (DARK)
Z range = 40 nm
S
C6H13
* *n
Donor (P3HT)
Photovoltaic activity occurring between PDI and P3HT
Z range = 60 mV
1 m
KPFM (LIGHT)
A A D
COFFEE TALKS @ ISOF
COFFEE TALKS @ ISOF
A. Liscio, G. De Luca, F. Nolde, V. Palermo, K. Müllen, P. Samorì,
JACS 2008, 130, 780-781
Photovoltaic activity occurring between PDI and P3HT
A A D
A
D
A
D
Photo-induced charges at interface = ca
103
electrons / μm2
VdQ
COFFEE TALKS @ ISOF
Present work in ISOF
Project Manager activities in an ITN project:
Technical/administrative skills:
• finance,
• time budgeting,
• reporting.
Scientific skills:
• interdisciplinary,
• intra-node coordination,
• inter-node coordination.
COFFEE TALKS @ ISOF
GENIUS will offer a top-quality environment for multidisciplinary training
and
Transfer of Knowledge (ToK)
in a very wide spectrum of techniques including:
• organic and supramolecular synthesis,
• nanofabrication techniques to self-assemble the GOHs in solution and on surfaces,
• SPM characterization of physico-chemical properties of the GOHs,
• new computational techniques to model graphenic systems,
• steady-state and time-resolved spectroscopies both in solution and solid state,
• fabrication and testing of graphene-based devices,
• development of new composites for electronics and consumer products.
Aim of the project
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ISOF-CNRSelf-assembly of graphene-based materials, electrical characterization at nanoscale by SPM
UCAMNanomaterials and Spectroscopy(Raman)
UCLOptoelectronics and nano-optics
UBERSurface characterisation (STM, STS, XPS, UPS)
BASFSynthesis and electronics
MPGOrganic synthesis
UMONSMolecular mechanics/dynamics and quantum chemical calculations
UdSSelf-assembly, nanoprobes and nanofabrication of nanodevices
Partners
COFFEE TALKS @ ISOF
ISOF UCL
UMONS
UdS
UCAM
MPG
BASF
UBER
Networking
Molecular design Molecular synthesis
Devices
Physico-chemical characterization
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Nanochemisty lab (ISOF)
Main activities• Graphene oxide single layer• Graphite exfoliation• Graphene-organic hybrid systems• Boron nitride exfoliation
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Zhen Yuan Xia(ER)
HOPG exfoliation in solution
Sonication
in DMF Electrochemical oxidation(0.5 M H2
SO4
, 0.5 h)Chemical oxidation(H2
SO4
, KMnO4
)
Studies of the mechanismsperformed by• OM• AFM• SEM
COFFEE TALKS @ ISOF
Andrea Schlierf(ESR)
Graphite exfoliation in solution using small molecules
centrifugation + excess dye removal
Exfoliation and suspension of graphene
Mas
s co
ncen
tratio
n [m
g/m
L]
Sonication time [hrs]
CompositionRAMAN
% S
ingl
e sh
eets
Morphology AFM TEM
P S 2
PS2
1m
PS1 PS2 PS3 PS4
COFFEE TALKS @ ISOF
Konstantinos K. Agalou(ESR)
Boron nitride exfoliation
1. Powder 2. Solution in IPA 3. Centrifugation
AFM
200 nm
4. Deposition on Si substrate
profile
Multi-layer: 2 nm
Single layer: ca 0.5 nm
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BOLOGNA Dr. Vincenzo PalermoDr. Emanuele Treossi
Networking & Aknowledgments
Graphene-Organic SuPramolEcular functionaL composites
www.gospel-network.eu/
www.genius-network.eu/
www.graphene-flagship.eu/
Marie Curie RTN Threadmil (2006-2010)Marie Curie IEF Hesperus (2008-2010)Marie Curie ITN Superior (2009-2012)
NanoSci-E+ project SENSORS (2009-2011)
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Collaborations
S
S
S
S
HN
O
SiEtO
EtOOEt
GO +
GOT4T4
Chemical functionalization of GO
Direct visualization of polymeric nanocarriers
electrostatically
loaded with porphyrin
photosensitizers
Plasmonic: direct visualization of Rabi splitting
Casimir effect: Patches influence
AFM KPFM
Size: 1.28 x 1.28 μm2