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8/10/2010
1
Sonochemical Growth of Zinc Oxide Nanostructures at Room Ambient
University of California, DavisInano (Integrated Nano-devices and Systems Research)
http://www.ece.ucdavis.edu/inano/
1
SonochemistryAcoustic Energy Mechanical EnergyElectrical Energy
ZnO Nanorose ZnO Nanowalls ZnO Nanowires
2
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ZnO Nanowires ZnO Nanowires
ZnO Nanowires ZnO Nanowires
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Zinc Oxide Nanowires grown using ultrasound sonication in under 15 minutes.
AGlass substrate
Shipley 1813 Resist (2µm)AGlass substrate
Shipley 1813 Resist (2µm)
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Zinc Oxide Nanowires grown on photoresist polymer using ultrasound sonication.
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5
Human Hair
Glass substrateFHuman Hair
Glass substrate
Human Hair
Glass substrateF
Zinc Oxide Nanowires grown on human hair using ultrasound sonication.
Zinc Oxide Nanowires grown on cotton using ultrasound sonication
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Zinc Oxide Nanowires grown on cotton using ultrasound sonication.
AMK3
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Variation of shape and size of ZnO nanostructures with change in pH level.
AMK1
1 2E 09
1.4E-09
1.6E-09
Response curve for ZnO nanowires exposed to ammonia
NH3 Off
2.0E-10
4.0E-10
6.0E-10
8.0E-10
1.0E-09
1.2E-09
Cur
rent
(A)
NH3 On
8
0.0E+00
0 10 20 30 40 50 60 70 80 90 100 110
Time (sec)
Zinc Oxide Nanowires serving as a gas sensor when exposed to ammonia.
AMK2
Slide 7
AMK1 Lower right image is not due to a modified pH.Aaron M. Katzenmeyer, 7/25/2010
Slide 8
AMK2 It's not clear how what is shown comprises a device. It functions as a varistor as a function of ammoniaexposure? Aaron M. Katzenmeyer, 7/25/2010
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SiSi02 SiC Al
Cr
SiO2SiO2 Ag
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Selective deposition of zinc oxide nanowires and nanowalls on different substrates.
AlSi02 Pt
Cr
SiO2SiO2
Si
Cr Si
Al
Al
Si02
Si02
Pt
Al
Si02
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Selective deposition of zinc oxide nanowires and nanowalls on different substrates.
Al
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Zinc Oxide nanowalls grown on aluminum coated glass
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Zinc Oxide nanowalls grown on Al wire, Al pallet, Al coated glass and Al foil.
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Transparency results before and after ZnO nanowall growth for different thickness’ of Al. The inset shows the optical images of the processed and unprocessed samples
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Growth kinetics for the formation of ZnO nanowalls
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(a) Seeding (b)Annealing (c) Growth( ) g ( ) g ( )
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The formation of ZnO nanowires
ZnO nanowire array grown using sonochemical method with thermally decomposed zinc acetate seed.
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Zinc Oxide nanowire array grown using the sonochemical method with spin cast ZnO nanocrystals.
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