Nonstoichiometric Zinc Oxide Nanorod Arrays Doped Co or Ni as Effective Antimicrobial Materials

Nonstoichiometric Zinc oxide (ZnO) nanorod arrays doped Co or Ni can be easily obtained by calicining soaked ZnO nanorod arrays. More importantly, the nonstoichiometric doped ZnO nanoarrays have more effective antimicrobial than pure ZnO nanoarrays, which means we can obtain a kind of promising new effective functional nanomaterials.

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Effects of Annealing Environments on the Solution-Grown, Aligned Aluminium-Doped Zinc Oxide Nanorod-Array-Based Ultraviolet Photoconductive Sensor

Journal of Nanomaterials ◽

10.1155/2012/189279 ◽

2012 ◽

Vol 2012 ◽

pp. 1-15 ◽

Cited By ~ 25

Author(s):

Mohamad Hafiz Mamat ◽

Mohd Izzudin Che Khalin ◽

Nik Noor Hafizah Nik Mohammad ◽

Zuraida Khusaimi ◽

Nor Diyana Md Sin ◽

...

Keyword(s):

Zinc Oxide ◽

Surface Condition ◽

Zno Nanorods ◽

Average Diameter ◽

Nanorod Array ◽

Zno Nanorod ◽

Nanorod Arrays ◽

Zno Nanorod Arrays ◽

High Concentration ◽

Doped Zno

We have fabricated metal-semiconductor-metal- (MSM-) type ultraviolet (UV) photoconductive sensors using aluminium- (Al-) doped zinc oxide (ZnO) nanorod arrays that were annealed in different environments: air, oxygen, or a vacuum. The Al-doped ZnO nanorods had an average diameter of 60 nm with a thickness of approximately 600 nm that included the seed layer (with thickness~200 nm). Our results show that the vacuum-annealed nanorod-array-based UV photoconductive sensor has the highest photocurrent value of 2.43 × 10-4 A. The high photocurrent is due to the high concentration of zinc (Zn) interstitials in the vacuum-annealed nanorod arrays. In contrast, the oxygen-annealing process applied to the Al-doped ZnO nanorod arrays produced highly sensitive UV photoconductive sensors, in which the sensitivity reached 55.6, due to the surface properties of the oxygen-annealed nanorods, which have a higher affinity for oxygen adsorption than the other samples and were thereby capable of reducing the sensor’s dark current. In addition, the sensor fabricated using the oxygen-annealed nanorod arrays had the lowest rise and decay time constants. Our result shows that the annealing environment greatly affects the surface condition and properties of the Al-doped ZnO nanorod arrays, which influences the performance of the UV photoconductive sensors.

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Fabrication of Intrinsic Zinc Oxide-Coated, Aluminium-Doped Zinc Oxide Nanorod Array-Based Ultraviolet Photoconductive Sensors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.773-774.696 ◽

2015 ◽

Vol 773-774 ◽

pp. 696-700

Author(s):

Mohamad Hafiz Mamat ◽

Mohd Firdaus Malek ◽

N.N. Hafizah ◽

Nor Diyana Md Sin ◽

I. Saurdi ◽

...

Keyword(s):

Zinc Oxide ◽

Sol Gel ◽

Rf Magnetron Sputtering ◽

Nanorod Array ◽

Zno Nanorod ◽

Nanorod Arrays ◽

Zno Nanorod Arrays ◽

Immersion Method ◽

Doped Zno ◽

And Performance

Fabrication and performance of metal-semiconductor-metal (MSM)–type intrinsic zinc oxide-coated, aluminium-doped ZnO nanorod array-based ultraviolet photoconductive sensors were reported and discussed. The Al-doped ZnO nanorod arrays were prepared using sonicated sol-gel immersion method. The coating process of intrinsic ZnO onto Al-doped ZnO nanorod arrays was performed using radio-frequency (RF) magnetron sputtering at different deposition times varying from 0 to 10 min. We observed that responsivity of the sensors decreased with increasing intrinsic ZnO deposition time, decreasing from 4.81 A/W without coating to 1.37 A/W after 10 min of coating. Interestingly, the sensitivity of the sensors improved with intrinsic ZnO coating, having a maximum value of 19.0 after 1 min coating.

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