14.25 o14 i islah u-din
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Transcript of 14.25 o14 i islah u-din
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Implanting Alkali Metal Atoms in Nanosized Cavities of Metal Oxide Based Organic-Inorganic Hybrids
Islah-u-din SupervisorsDr Jeff L. Tallon (IRL)Dr Mark R. Waterland(Massey)Dr Shane G. Telfer(Massey)
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Contents
• Introduction and applications of hybrid materials
• Research outline
• Experimental work
• Results
• Future Directions
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Organic-Inorganic Materials
A hybrid material is biphasic in nature with organic and inorganic components mixed together at very small scale.
Macroscopic Phase
Micro or nanoscale building blocks
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Types of Hybrid Materials
[CH3(CH2)11NH3]SnI3 (Mg,Al)2Si4O10(OH)·4(H2O)
Class-I Hybrid Materials Class-II Hybrid Materials
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Applications
Nanohybrid solar cell Protective coatings
C. Sanchez, B. Julián, P. Belleville and M. Popall, Journal of Materials Chemistry, 2005, 15, 3559-3592.
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Superconductivity
Tc = 78 K before intercalation
Tc = 82 K after intercalation
S.-J. Kwon and J.-H. Choy, Inorg. Chem, 2003, 42, 8134-8136
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Superconductivity
WO3 ( Na+)
Tc = 125 K for Na+
A. E. Aliev, Superconductor Science and Technology, 2008, 21, 115022
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Research Outline
• Synthesize Crystalline W (or Mo)O3 Hybrids
• Intercalation of metal species by Ion-Implantation
• Structural Characterization Before and After Implantation
• Fabrication of Films
• Intercalation of metal species by Ion-Implantation
• Physical Property Measurement
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Hydrothermal Synthesis
• Self-assembly
• Autogenous Pressure
• 120-260 oC
• Slow Cooling
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Single-Crystal XRD•Rigaku-Spider X-ray diffractometer, Massey University
•Cu Kα (λ = 1.5428 Å)
•Measurements on same crystal before and after implantation
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Ion-Implantation•Low energy lab-built ion-implanter, GNS Sciences•Na+, Ca2+ and K+
•25 Kev•2% and 4% of atomic sites
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WO3(4,4-bipyridyl)0.5
W
O
N
C
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Na+-WO3(4,4-bipyridyl)0.5 Ca2+-WO3(4,4-bipyridyl)0.5 K+-WO3(4,4-bipyridyl)0.5
Islah-u-din, M. R. Fox, H. n. Martin, G. J. Gainsford, J. Kennedy, A. Markwitz, S. G. Telfer, G. B. Jameson and J. L. Tallon, Chemical Communications, 46, 4261-4263.
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WO3(4,4-bipyridyl)0.5 Thick Films•Physical Property Measurements
•Modified layer-by-layer deposition
•Characterization before and after implantation
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Structure of thick films
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Raman Measurements
O – W – O W =O
4,4-bipyridyl
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X-Ray Photoelectron Spectroscopy
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Raman Measurements
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Resistivity Measurements
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Conclusions
• Incorporation of metal ions within small cavities of host materials
• Structural agreement between bulk and thick films
• Reduced tungsten species• Injection of charge carriers to conduction band
upon implantation
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Future Directions
• Synthezie new layered hybrids with different ligands
• Seek Ion-Implantion
• Fabricate thin films
• Confirm insulator-to-metal transition
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Acknowledgement Funding
The Higher Education Commission, Pakistan The MacDiarmid Institute for Advanced Materials and
Nanotechnology
Collaborators Dr Shen V. Chong, Industrial Research Limited Ms Vivian Fang, GNS Sciences Prof. Geoffery B. Jamseson, Massey University
Supervisors Dr Jeff L. Tallon, Dr Mark R. Waterland, Dr Shane G. Telfer
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Thanks