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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/

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SonochemistryAcoustic Energy Mechanical EnergyElectrical Energy

ZnO  Nanorose ZnO  Nanowalls ZnO  Nanowires

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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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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

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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.