applications of nmr in materials physics: from nano to...
TRANSCRIPT
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Applications of NMR in Materials Physics: Applications of NMR in Materials Physics: From Nano to Bulk MaterialsFrom Nano to Bulk Materials
Yue Wu
Department of Physics and Astronomyand
Curriculum in Applied and Materials SciencesUniversity of North CarolinaChapel Hill, NC 27599-3255
Email: [email protected]
Support: NSF, ARO, ONR, NASA, DOE, PRF, and CNSF
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Two bottom line questions we face:Two bottom line questions we face:
1. When a funding agency solicits proposals to address a certain problem, what could NMR offer to get you funded?
relevance to technology
2. Could NMR provide unique information and discover new physics?
relevance to science
MoneyMoney
PapersPapers
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1952 Physics
1991 Chemistry 2002 Chemistry
Kurt Wüthrich
Paul C. Lauterbur Sir Peter Mansfield
2003 Medicine
Felix BlochEdward Purcell
Richard Ernst
30 MHz
0.68 T
Nobel Prize and NMR
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Some Basic Information by NMR• Structures (protein)• Electronic properties (d-wave of high-Tc superconductor)• Dynamics (diffusion)
Necessary conditions to be competitiveSensitivity, resolution, extreme conditions (high and low temperatures, high pressure, etc…), environment control (orientation, optical, vacuum or vapor, etc…)
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Outline: a few examples on what we have learned Outline: a few examples on what we have learned with NMR with NMR
Very Important: You have to have interesting, the best, and very well characterized materials.
1. Nanotubes and nanocontainers
2. Bulk metallic glasses
B Zhang, D. Q. Zhao, M. X. Pan, W. H. Wang, A. L. Greer, PRL 94, 205502 (2005)
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Intrinsic Electronic Properties:
X.-P. Tang, et. al. Science 288, 492 (2000).13C
Gas Adsorption:A. Kleinhammes et. al.Phys. Rev. B 68, 075418 (2003).
NMR Studies of SWNTsNMR Studies of SWNTs
Lithium Intercalation:B. Gao et al. Chem. Phys. Lett. 307, 153-157 (1999).H. Shimoda et al. Phys. Rev. Lett. 88, 015502 (2002).
Water Adsorption:S.-H. Mao et al.
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Uncorrelated electron theory!
Structure Theoretical Prediction1. n1=n2 armchair Truly metallic2. n1 - n2 =3m Very narrow gap3. all others Semiconducting
Electronic Structure of SWNTs
1/3
2/3
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InformationInformation
13C
e n e nen 3 5
2en
3( )( )= dipolar interaction
8= ( ) Fermi contact interaction3
( ) [ , ]
n e en
e n
r rr r
I S r
d t idt
μ μ μ μ
π γ γ δ
ρ ρ
= + +
−
=
i i i
i
H H H H
H
H
H
H0
Hloc
Electron spin Nuclear spin
e e Sμ γ= −n n Iμ γ=
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FT
rf pulse
rf detection
Sample in coil
gate
LC1
=ω
Nuclear Magnetic ResonanceNuclear Magnetic Resonance
H0
( )
dJ Hdt
Jd Hdt
μ
μ γμ μ γ
= ×
=
= ×
M0
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Ref:TMS σ11 σ22 σ33 σiso (ppm) η Benzene 217 141 1 120 0.64Graphite 178 178 0 119 0
C60 220 186 25 143 0.29SWNTs (0.85 nm) 195 160 17 124 0.33SWNTs (1.40 nm) 120
1313C NMR of Pure Carbon NanotubesC NMR of Pure Carbon Nanotubes
H0
Hloc13C
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Nuclear SpinNuclear Spin--Lattice RelaxationLattice Relaxation
Thermal equilibrium
Infinite temperature
Thermal equilibrium
0nz n
B
HNMV k T
μμ=
[ ])/exp(1)( 10 TtMtM z −−=
equilibrium
Tn = ∞Te = T
H0
2 2
1
2 1 ( )Bdip F
ave
k A g ETT
π=
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Metallic and Semiconducting SWNTsMetallic and Semiconducting SWNTs
βα αα 11 //* )1()( TtTt eetM −− −+=
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Ni/Co: 0.6 at% each
SpinSpin--Lattice Relaxation in SWNTsLattice Relaxation in SWNTs
2 2
1
2 1 ( )Bdip F
ave
k A g ETT
π=
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Nuclear Spin-Lattice Relaxation
2 2
1
2 1 ( )Bdip F
ave
k A g ETT
π=
23
2 15dip e nA
rγ γ= 78.23 10dipA eV−= ×Ab initio for ppπ:
1 1
1
1 0.00028ave
K sTT
− −= ( ) 0.022 /( )Fg E states eV spin atom= ⋅ ⋅
Prediction for (10,10) tubes: ( ) 0.015 /( )Fg E states eV spin atom= ⋅ ⋅
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Lithium BatteryLithium Battery
Graphene sheet Li
High Density Anode Storage Material
B. Gao et al. Chemical Physics Letters 307, 153-157 (1999).
50 mA/g, 800 mAh/g
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Molecular AdsorptionMolecular Adsorption
Molecular transport and delivery
Molecular filters, sensors, and toxic molecule removal
sarin methanesulfonylchloride
methyl methacrylate
Fuel cells: hydrogen storage
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Lithium IntercalationLithium Intercalation
Cut SWNTs
Uncut SWNTs
T1=12.0s
T1=3.2s
T1=6.0s
13C
H. Shimoda et al. Physical Review Letters 88, 015502 (2002).
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H2: 2.96ÅO2: 3.43ÅN2: 3.85ÅHe: 2.57ÅCO2: 3.897ÅCO: 3.59ÅN2O: 3.816ÅXe: 4.31ÅCH4:3.82Å
Gas AdsorptionGas Adsorption
(10,10)
17Å
13.56Å
surface
groove
interstitial
inside
2.6Å
Surface area (N2-B.E.T.):300 m2/g50 tubes/bundleBundle diameter:12 nm
A. Kleinhammes et. al., Phys. Rev. B 68, 075418 (2003).
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Gas ExposureGas Exposure
Pump
H2Pressure Gauge
Valve Superconductor
Magnet
Probe
Saddle Coil
Sample holder
System Control
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Influence of Gas ExposureInfluence of Gas Exposure
interstitial(10,10)
17Å
13.56Å
surface
groove
inside
2.6Å
H2: 2.96ÅO2: 3.43ÅN2: 3.85ÅHe: 2.57ÅCO2: 3.897ÅCO: 3.59ÅN2O: 3.816ÅXe: 4.31ÅCH4:3.82Å
0.1
1
0 5 10 15 20 25 30 35 40
vacuumH
2 gas
CO2 gas
He gasairO
2 gas
M*(
t)
Recovery time t (s)
13C NMR
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Proton Spectrum of CHProton Spectrum of CH44 Adsorbed in Cut SWNTsAdsorbed in Cut SWNTs
Adsorbedmoleculesinside SWNTs
NMR rf coil
Gas molecules
NMR sampletube
-1 104-5000050001 104
Frequency (Hz)
CH4 at 0.044 MPa Cut SWNTs
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Methane and Ethane AdsorptionMethane and Ethane Adsorption
-1.5 104-1 104-5000050001 1041.5 104
Frequency (Hz)
C2H
6
CH4
1H at 4.7 Teslacut SWNTs Gas pressure: 0.045 MPa
)/exp(10 13 Tks Bετ −=
meV 330for 108.2 8
=×= −
ετ s
Residence time
Gas
Adsorbed outside
Adsorbed inside
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0.01
0.1
1
0 2000 4000 6000Ec
ho H
eigh
t2τ (μs)
T2a
: 125 (μs)
T2b
: 2.8 (ms)
SpinSpin--Spin RelaxationSpin Relaxation
Gas
Adsorbed outside
Adsorbed inside
2
2
0
1
( )
( )
( )
x xx
y yy
zzz
dM MHdt T
dM MH
dt TM MdM H
dt T
γ μ
γ μ
γ μ
= × −
= × −
−= × +
H0 H0 H0 H0
T2 T1rf pulse
-1 104-5000050001 104
Frequency (Hz)
CH4 at 0.044 MPa Cut SWNTs
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Spin Lattice RelaxationSpin Lattice Relaxation
0
50
100
150
200
250
300
350
0 1 105 2 105 3 105 4 105 5 105 6 105
T 1 (ms)
Pressure (Pa)
Gas
Adsorbed
ethane
1
1 ( ) ( )
collision collision
gas wall
R gas R wallT
cn n
= +
=+
B0
rLocal field fluctuations
νh
-1 104-5000050001 104
Frequency (Hz)
CH4 at 0.044 MPa Cut SWNTs
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0
1
2
3
0 2 105 4 105 6 105 8 105
CH4 gas
Adsorbed CH4 (cut)
Adsorbed CH4 (uncut)
C2H
6 gas
Adsorbed C2H
6 (cut)
Num
ber o
f Mol
ecul
es (m
mol
/g)
Pressure (Pa)
Adsorption IsothermAdsorption Isotherm
Cut SWNTs
Uncut SWNTs
-1 104-5000050001 104
Frequency (Hz)
CH4 at 0.044 MPa Cut SWNTs
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Langmuir Adsorption IsothermLangmuir Adsorption Isotherm
bPbPnTPn+
= ∞ 1),(
)/exp( 20
TkETmk
b BdBπν
σ=
kJ/mol 22.7meV 235 ==dEFor methane
kJ/mol 29.2meV 303 ==dEFor ethane
219methane m 106.1 −×=σ 219
ethane m 100.2 −×=σ
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-1 104-5000050001 1041.5 104
420 torr CH4, 600 torr O
2
420 torr CH4
Frequency (Hz)
Competitive Adsorption: Methane and OxygenCompetitive Adsorption: Methane and Oxygen
---The adsorption energy of oxygen molecules in carbon nanotubes is very small. ---Why is there then such large oxygen effects on electronic properties?
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Question:Could dipole-dipole interactions be tuned in gases/liquids without changing the density?
Yes!
Size and shape effect:
Gases in NanoGases in Nano--ContainersContainers
J. Baugh, et. al. Science 294, 1505 (2001).
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Dipolar Interactions of Gas Contained in an EllipsoidDipolar Interactions of Gas Contained in an Ellipsoid
( ) ( )2
23
3cos 11 32
jkd j k jz kz
j k jk
I I I Ir
θγ
<
−= • −∑H
( )223
(cos )3jk
d j k jz kzj k jk
PI I I I
rθ
γ<
= • −∑H
( )2 23
,
(cos ) 1 3cos 1 ( / )2
jk j k
jkV V
P dV dV f b ar V V V
θ= Ω −∫∫
oB
Ωrθ
b
a
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Elongated Aligned Nanovoids in HWCVD aElongated Aligned Nanovoids in HWCVD a--Si:HSi:H
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0.1
1
10
100
200 400 600 800 1000
858068554530150
time (microseconds)
Echo
hei
ght (
a.u.
) angle (o)
Orientation DependenceOrientation Dependence
)(cos Hz 4602/36.2 22 Ω= PM π
2
3
224
2
3
224
2 21cos3)1)(1(3
1cos31)1(23
rNII
rNIIM
kj jk
jk −−+=
−+= ∑
<
θγθ
γ
V
PabfVNIIM
)(cos2)/(/)1()1(32
2Ω−+
=γ
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2a=9.2 nm,2b =3 nm
Estimation of the NanoEstimation of the Nano--Container SizeContainer Size
2 22.36 / 2 460 Hz (cos )M Pπ = Ω
2 3 ( 1) ( 1)/ ( / ) (cos )22
I I N V f b a PM
V
γ + − Ω=
2a
2b
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Glass TransitionGlass Transition
Ent
halp
y or
Vol
ume
Temperature
Glass
Crystal
Tg Tm
liquidsolid: glass
solid: crystal10 s
Tc>Tg
---X.-P. Tang, R. Busch, W. L. Johnson, and Y. Wu, Phys. Rev. Letts. 81, 5358 (1998).---X.-P. Tang, U. Geyer, R. Busch, W. L. Johnson, and Y. Wu, Nature 402, 160 (1999).---J. Schroers, Y. Wu, R. Busch, and W. L. Johnson, Acta Materialia 49 (14), 2773 (2001).---L. Li, J. Schroers, and Y. Wu, Phys. Rev. Letts. 91, 265502 (2003).
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NMR and Local FieldNMR and Local Field
|-1/2>
|1/2>
0( )n local zE B B Iγ ωΔ = + =
Probability of finding a spin at a given local field
B0
Shift:local field
( ) ( ) ( )i i ir t R t u t= +
The average shift of this peak is not affected by in glassy and liquid systems regardless of its timescale. How about ?
( )iR t( )iu t
3000 2500 2000 1500 1000 500 0
Glass
Shift (ppm)
Liquid
31PPdNiCuP
induced motional narrowing( )iR t
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Knight Shift
vibrations
Dynamically Induced ShiftDynamically Induced Shift
0 s 0.1 ps 0.2 ps
T
28 (0)3 F
obs refPauli
Eref
Kν ν π ψ χ
ν−
≡ = Ω
22 ( )Pauli B Fg Eχ μ=
0( ) ( ) ( ( ))i i ir r r R uψ ψ ψ= + − +∑
F
2 20 1 (0)
Ea a uψ = + < >
A crude analysis of explicit T dependence
Volume dependence, , i PauliR χΩ
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0( ) ( ) ( ) ( )i i ii neighbors
r r r R uψ ψ ψ=
= + − +∑
F
2 20 1 (0)
Ea a uψ = + < >
28 (0)3 F
PauliE
K π ψ χ= Ω
2 2 2vib ratu u u< >=< > + < > 2
vib Bu k T< >∝
Mode-coupling theory
Above Tc: constantBelow Tc
22 2 11 ( ) /
2rat c c cu u a T T T⎛ ⎞< >= − −⎜ ⎟⎝ ⎠
2ratu< >
Dynamically Induced Shift Dynamically Induced Shift
2 20( ) ( ) ( ) )vib ratK K V a V u b V u= + Δ < > + Δ < >
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3131P NMR Spectra of PdP NMR Spectra of Pd4343NiNi1010CuCu2727PP2020
3000 2500 2000 1500 1000 500 0
CrystalGlass
Shift (ppm)
Liquid
RT
1057 K
550 600 650 700 750 800 850 90050
100
150
200
250
Tx=670 K
Tliq=870 K
Hea
t Flo
w (m
J/s)
Temperature (K)
DSC: 20 K/min, Pd43Ni10Cu27P20
Tg=583 K
B2O3 flux
Al2O3spacer
PdNiCuPIsothermal DSC
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3000 2000 1000 0Shift (ppm)
1036K
750K
730K
583K
300K
2200 2100 2000 1900 1800 1700 1600Shift (ppm)
1036K
740K
750K
730K
Temperature Dependence of the ShiftTemperature Dependence of the ShiftPd43Ni10Cu27P20
31P
550 600 650 700 750 800 850 90050
100
150
200
250
Tx=670 K
Tliq=870 K
Hea
t Flo
w (m
J/s)
Temperature (K)
DSC: 20 K/min, Pd43Ni10Cu27P20
Tg=583 K
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200 400 600 800 1000
1000
1100
1200
160017001800190020002100 Tliq
Shift
(ppm
)
Temperature (K)
Melting point
Tg
Temperature Dependence of the ShiftTemperature Dependence of the Shift
crystal
Tc=660 K to 700 K2
22 /)(211 ⎟
⎠⎞
⎜⎝⎛ −−>=< cccrat TTTauu
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ln ln lnln ln lnP T V P
K K K TV V T V
∂ ∂ ∂ ∂⎛ ⎞ ⎛ ⎞ ⎛ ⎞ ⎛ ⎞= +⎜ ⎟ ⎜ ⎟ ⎜ ⎟ ⎜ ⎟∂ ∂ ∂ ∂⎝ ⎠ ⎝ ⎠ ⎝ ⎠ ⎝ ⎠
200 400 600 800 1000
1000
1100
1200
160017001800190020002100 Tliq
Sh
ift (p
pm)
Temperature (K)
Melting point
Tg
Effect of Thermal ExpansionEffect of Thermal Expansion
I.-R. Lu et al., APL 80, 4534 (2002)
For a volume increase of 6%, the expected increase of the shift is:
2/3 2( ) ( ) (1 / )3
K V V V V V V Vα α+ Δ = + Δ ≈ + Δ2/ / 4%3
K K V VΔ = Δ =
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F
221 3 3 2 2 21 e n F B
64 (0) ( )9 E
T g E k Tπ γ γ ψ− =
22 e
1 s 2B n
4
TTK fkγ
π γ=
SpinSpin--Lattice Relaxation: Lattice Relaxation: KorringaKorringa RelationRelation
300 600 9001
2
3
4
5
6
T 1TK2 (1
0-6 K
*s)
Temperature (K)28 (0)
3 FPauli
EK π ψ χ= Ω
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28 (0)3 F
obs refPauli
Eref
Kν ν π ψ χ
ν−
≡ = Ω
22 22 2 0
0 20 0
(0) ( )1(0) ( ( )) (0) ( ) shear strain terms2 ( / )
F
F F
E
E E
V t VV t VV V V
ψψ ψ
∂ ⎛ ⎞−= + +⎜ ⎟∂ ⎝ ⎠
compressional strain2
0
0
( ) /BV t V k T
Vβ
⎛ ⎞−≈ Ω⎜ ⎟
⎝ ⎠β: volume compressibility
Qualitative InterpretationQualitative Interpretation
200 400 600 800 1000
1000
1100
1200
160017001800190020002100 Tliq
Shift
(ppm
)
Temperature (K)
Melting point
Tg
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Participants in my group: Alfred Kleinhammes, Xiaoping Tang, Jonathan Baugh, Lilong Li, Shenghua Mao, Marcelo Behar
Otto Zhou’s group at UNC-CH
Weihua Wang’s group at the Institute of Physics, CAS.
AcknowledgementAcknowledgement