-
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
-
8/10/2010
2
ZnO Nanowires ZnO Nanowires
ZnO Nanowires ZnO Nanowires
3
Zinc Oxide Nanowires grown using ultrasound sonication in under
15 minutes.
AGlass substrate
Shipley 1813 Resist (2µm)AGlass substrate
Shipley 1813 Resist (2µm)
4
Zinc Oxide Nanowires grown on photoresist polymer using
ultrasound sonication.
-
8/10/2010
3
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
6
Zinc Oxide Nanowires grown on cotton using ultrasound
sonication.
AMK3
-
8/10/2010
4
7
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
-
8/10/2010
5
SiSi02 SiC Al
Cr
SiO2SiO2 Ag
9
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
10
Selective deposition of zinc oxide nanowires and nanowalls on
different substrates.
Al
-
8/10/2010
6
11
Zinc Oxide nanowalls grown on aluminum coated glass
12
Zinc Oxide nanowalls grown on Al wire, Al pallet, Al coated
glass and Al foil.
-
8/10/2010
7
13
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
14
Growth kinetics for the formation of ZnO nanowalls
-
8/10/2010
8
(a) Seeding (b)Annealing (c) Growth( ) g ( ) g ( )
15
The formation of ZnO nanowires
ZnO nanowire
array grown using sonochemical method with thermally decomposed zinc acetate seed.
16
Zinc Oxide nanowire array grown using the sonochemical method
with spin cast ZnO nanocrystals.