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Construction of Nanostructured Cobalt Oxide Thin Films

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Title: Construction of Nanostructured Cobalt Oxide Thin Films


1
Construction of Nanostructured Cobalt Oxide Thin
Films
  • Jordan Maron
  • Jamie Neilson
  • Daniel Morse
  • Biomolecular Science and Engineering

2
Why Study Cobalt Oxide?
  • Energy application photocatalytic water
    splitting generating hydrogen fuel from light
  • Enabled by
  • Atomic structures with Co(III), e.g. Co3O4
  • Morphology with high surface area

Cobalt Oxide Powder
Cobalt Oxide Atomic Structure
3
Cobalt Oxide Background
  • Usually produced with irregular morphology and
    microstructure
  • Hard to characterize
  • Our method of synthesis allows for control of
    morphology on the nano scale
  • More useful for proposed applications

4
My Project Goal
  • Find which cobalt counter ion and annealing
    temperature produce the most crystalline cobalt
    oxide sample with the highest specific surface
    area derived from a nanostructured architecture

5
Experimental Methods
  • Synthesize cobalt hydroxide by reacting various
    CoAx precursors with ammonia via vapor diffusion
  • Cobalt chloride
  • Cobalt perchlorate
  • Cobalt sulfate
  • Cobalt iodide
  • Sample Treatment
  • One substrate left as is
  • One put in 180C oven
  • One put in 500C furnace
  • One put in 800C furnace
  • Analysis and characterization

6
Experimental Methods Visual
Start
Finish
7
Characterization
  • Two machines are used
  • X-Ray diffractometer
  • Scanning electron microscope
  • Used to identify compound and analyze its
    morphology

8
X-Ray Diffraction
  • Control Alfa Aesar cobalt oxide

9
X-Ray Data Continued
  • Cobalt chloride precursor

10
X-Ray Data Continued
  • Cobalt perchlorate precursor

Both Cobalt Oxide
Amorphous
Cobalt Hydroxide
11
Scanning Electron Microscopy
  • Control Alfa Aesar cobalt oxide

Relatively unstructured morphology
12
SEM Data Continued
  • Cobalt chloride precursor

Individual platelets at all temperatures
Notice strange Swiss- cheese platelet morphology
in 900C sample
13
SEM Data Continued
Varying morphology at all temperatures
  • Cobalt perchlorate precursor

Very interesting porous nanostructure -
cause unknown
14
Results Summary
15
Conclusions
  • Both counter ion and annealing temperature
    determine material properties
  • Determines morphology
  • Crystal orientation
  • Atomic structure
  • Larger counter ions decrease annealing
    temperature needed and increases microporosity

16
Future Exploration
  • Perform a second trial with each precursor to see
    whether or not the results can be reproduced or
    improved
  • Investigate causes of certain morphologies
  • Test performance of our cobalt oxide and compare
    to that of commercially available cobalt oxide
  • Analyze with transmission electron microscope
  • Measure specific surface area

17
Reflections
  • I got a taste of what it is like to do graduate
    research in a real laboratory
  • I confirmed for myself that pursuing a career in
    the sciences seems to be the right path for me
    take
  • I loved getting to use all the really fancy
    equipment

18
Acknowledgements
  • Jamie Neilson and Birgit Schwenzer for being my
    mentors
  • Professor Daniel Morse for allowing me to work in
    his department
  • California NanoSystems Institute, Institute for
    Collaborative Biotechnologies, Department of
    Energy, and National Science Foundation for
    funding the research
  • Lubi, Anthony, and Herb for organizing the
    program

19
Construction of Nanostructured Cobalt Oxide Thin
Films
  • Jordan Maron
  • Jamie Neilson
  • Daniel Morse
  • Biomolecular Science and Engineering

20
X-Ray Data
  • Cobalt sulfate precursor

Notice consistency between trials
Cobalt oxide confirmed in matching 800C
samples 500C contained one cobalt oxide peak As
is and 180C shown to contain cobalt hydroxide
21
SEM Data
  • Cobalt sulfate precursor

Globule Morphology
22
X-Ray Data
  • Cobalt iodide precursor

Co3O4
Co3O4
Disordered Co3O4
Cobalt Hydroxide
23
SEM Data
  • Cobalt iodide precursor

Morphology resembles that of the 800C sulfate
sample
24
TGA Data
Chloride Sample
25
TGA Data
Perchlorate Sample
26
TGA Data
Sulfate Sample
27
TGA Data
Iodide Sample
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