versatile multi-layered metal-oxide inverse opal ...764851/fulltext01.pdf · creation of opals...
TRANSCRIPT
![Page 1: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/1.jpg)
Versatile multi-layered metal-oxide inverse opal
fabrication for photocatalytic applications
Delphine Lebrun Div. Solid state physics
Dep. Engineering Sciences
Uppsala University
Sweden
![Page 2: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/2.jpg)
![Page 3: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/3.jpg)
Photonic crystals
Engineering choices
Creation of opals
Creation of inverse opals
Controlled Structure
Acknowledgments
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 4: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/4.jpg)
Blue peafowl
Pavo cristatus
Comb-jellyfish
Beroë cucumis
Beetle
Pachyrrhynchus congestus
pavonius
Morpho Rethenor Opal Jun Xu 2013
Photonic crystals
![Page 5: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/5.jpg)
STRUCTURAL: 2 DIELECTRICS
∆ 𝜀 ≥ 2
Standing waves Frequency gaps
EM(𝑥) depends on 𝜀(𝑥) ∙ 𝐼(𝑥):
Two standing waves have different energies at zone boundaries ↓
Frequency gaps form & prevent photons from propagating ↓
Light totally reflected at these “photonic band gap” (PBG) energies
Photonic crystals
![Page 6: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/6.jpg)
Forbidden region in orange = total reflection
→ Photonic Band Gap (PBG)
Above and Below = light propagates in the structure
Band structure alumina inverse opal (FTDT)
P. Sahoo (KTH) MIT Photonics
Photonic crystals
![Page 7: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/7.jpg)
Engineering choices
Creation of opals
Creation of inverse opals
Controlled structure
Acknowledgments
Photonic crystals
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 8: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/8.jpg)
With a direct electronic band
gap material
With an indirect electronic
band gap material
Forbidden photonic band
Quench recombination rate
Slow light velocity at higher energy
PBG edge increase electron-hole
pair generation
PBG
PBG
Electronic
band gap
Electronic
band gap
𝑑𝐸
𝑑𝑘= 𝑉𝐺
Engineering choices Ideal position of the PBG for light harvesting
![Page 9: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/9.jpg)
Refractive indices difference
TiO2 Fe2O3 ZnO
Al2O3
Air
H2O
Polystyrene
1.5 1.9 1.0 0.7
1.1 1.6 0.7 0.4
0.9 1.4 0.4 0.1
Engineering choices
![Page 10: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/10.jpg)
Creation of opals
Creation of inverse opals
Controlled structure
Acknowledgments
Photonic crystals
Engineering choices
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 11: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/11.jpg)
Convective
Evaporation
Beads: PS, silica, PMMA
Substrates: quartz, glass, ITO
Cleaning: Decon90
T= 50°C
25mL beakers
20mL solution
Small angle <10°
Ultra-sonic bath 15 min prior deposition!
Anneal at 85°C for 1h30.
Creation of opals
![Page 12: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/12.jpg)
Periodicity
SHAPE
=
FWHM
SCALE = DEPTH
Photonic Band Gap
Concentration
Temperature
& Humidity
Refractive index
difference
✓ ✓
✓ ✓ ✓
✓
Creation of opals 2 cm
![Page 13: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/13.jpg)
Creation of inverse opals
Controlled structure
Acknowledgments
Photonic crystals
Engineering choices
Creation of opals
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 14: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/14.jpg)
Atomic Layer Deposition Alumina example
H2O Purge
TMA Purge
´3
´3
0.1 s
0.1 s
120 s
120 s
Creation of inverse opals
![Page 15: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/15.jpg)
85°C 450°C
➊ ➋ ➌
Convective evaporation Atomic Layer Deposition Annealing
Creation of inverse opals
![Page 16: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/16.jpg)
Controlled structure
Acknowledgments
Photonic crystals
Engineering choices
Creation of opals
Creation of inverse opals
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 17: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/17.jpg)
Filling factor influence Example of 150nm periodicity Al2O3 inverse opal
Blue: 50 cycles
Red: 100 cycles Green: 150 cycles
Black: 200 cycles
245
250
255
260
265
270
275
280
285
290
0 5 10 15 20 25Braggl(nm)
Al2O3thickness(nm)
Opal diameter 148nm
Simulated PGB position
Controlled structure
![Page 18: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/18.jpg)
Multi-layer EDS
SEM
TiO2
Al2O3
Air
Controlled structure
![Page 19: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/19.jpg)
Inverse core-shell structure simulation:
Shift of the Bragg peak vs TiO2 thicknesses
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
325 375 425 475 525
Tra
nsm
itta
nce
λ(nm)
Inverse Alumina 2 nm 5 nm 10 nm
17nm shift 40nm shift 60nm shift
Bragg peak position obtained by FDTD simulation
P. Sahoo (KTH)
Controlled structure
![Page 20: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/20.jpg)
Red: 70 cycles
Blue: 155 cycles
Green : 200 cycles
Black: 250 cycles
ALD Al2O3 : 200 cycles
Experimental shift of the PBG with TiO2 thickness
ALD TiO2
5nm
10nm
15nm 19nm
Controlled structure
![Page 21: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/21.jpg)
Δ = 5 Δ= 11
0
10
20
30
40
50
60
70
0
50
100
150
200
250
300
350
400
450
500
0 2 4 6 8 10 12 14 16 18 20
FW
HM
(n
m)
PB
G (
nm
)
TiO2 thickness (nm)
FWHM vs TiO2 thickness
Simulated
Experimental
PGB position vs TiO2 thickness
Simulated
Experimental
Data analysis of the Al2O3/TiO2 200nm periodicity inverse opals
Controlled structure
![Page 22: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/22.jpg)
Acknowledgments
Photonic crystals
Engineering choices
Creation of opals
Creation of inverse opals
Controlled structure
Versatile multi-layered metal-oxide inverse opal fabrication for photocatalytic
applications
![Page 23: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/23.jpg)
Acknowledgments
Supervision: L. Österlund, G. Niklasson, Dep.
Engineering Sciences, and V. Kapaklis, Dep.
Physics and Astronomy, Uppsala University,
Sweden
ALD deposition: M. Fondell and M. Boman, Dep.
Chemistry, Uppsala University, Sweden & M.
Pemble, Tyndall National Institute,
Ireland
Simulations: P. Sahoo and S. Anand, Dep.
Materials Physics, KTH,
Sweden
![Page 24: Versatile multi-layered metal-oxide inverse opal ...764851/FULLTEXT01.pdf · Creation of opals Creation of inverse opals Controlled structure Acknowledgments Photonic crystals Engineering](https://reader034.vdocument.in/reader034/viewer/2022042411/5f2a278e9645833c1b64b5c5/html5/thumbnails/24.jpg)
Thank you for your attention!
I would be glad to answer
questions and take home
remarks.
Delphine
Contact: dele@angstrom
.uu.se