Title: Structure%20of%20ZnO%20Nanorods%20using%20X-ray%20Diffraction
1Structure of ZnO Nanorods using X-ray Diffraction
Marci Howdyshell Albion College Mentors Bridget
Ingham and Michael Toney
2Introduction
- What?
- Zinc Oxide (ZnO)
- Why?
- Future applications of ZnO such as chemical
sensing and optoelectronics - The nanostructures enhance bulk characteristics
- The crystal structures of nanorods affect
different properties - We can look at orientations
- How?
- X-ray diffraction!
3The experiment
1/2 O2 H2O 2e - --gt 2OH - Zn2 2OH - --gt
ZnO 2 H2O
Schematic diagram of experimental setup CE is
counter electrode RE is reference electrode.
-The electrochemistry is controlled as the x-ray
beam reflects off the top of the quartz rod
(working electrode) and onto the detector.
4Diffraction Pattern
ZnO (102)
ZnO (102)
5Making some sense of it
ZnO (102)
6Making some sense of it Intensity vs. ? Plots
Au (111)
ZnO (002)
ZnO (102)
ZnO (101)
7ZnO (102) Peak Width
- Width corresponds with how much the grain
direction varies about the midpoint.
- Less negative potential means greater width and
therefore more variation of grains about the
midpoint
Potential (mV vs. Ag/AgCl/KCl
8Growth of ZnO Nanostructures
More negative thicker
Less negative thinner
Less negative potentials (-370 mV)
9SEM Images
-970 mV
-770 mV
-370 mV
-670 mV
65C, 5mM Zinc Nitrate,0.1M KCl
10Future Analysis
- Complement with electron microscopy
- Time series modeling
- XANES/EXAFS
- B. Ingham, B. N. Illy, J. R. Mackay, S. P. White,
S.C. Hendy, M. P. Ryan, Mat. Res. Soc. Symp.
Proc. 1017 (2007) DD12.16 - B. Ingham, B. N. Illy and M. P. Ryan, J. Phys.
Chem. C (submitted)
11Acknowledgements
- Bridget Ingham, Michael Toney (SSRL)
- Benoit Illy and Mary Ryan (Imperial College
London) - DOE, SULI Program Coordinators