Effects of surface modification of the individual ZnO nanowire with oxygen plasma treatment

Ra, Hyun-Wook; Khan, Rizwan; Kim, J.T.; Kang, Bonan; Bai, KH; Im, Yeon-Ho

doi:10.1016/j.matlet.2009.08.054

Cited by 48 publications

(25 citation statements)

References 14 publications

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“…A few approaches have been proposed that can enhance the performance of the ZnO-based UV photoconductive sensor by improving the ZnO surface condition and reducing the defects. These approaches include the use of polymer and metal surface coatings [13,[21][22][23] and plasma and chemical surface treatments [24][25][26][27][28]. These techniques facilitate efficient photogeneration processes in the ZnO under UV illumination, thereby contributing to improved performance of the device, such as a high and stable photocurrent, high sensitivity, and a fast photoresponse.…”

Section: Introductionmentioning

confidence: 99%

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

Mamat

Khalin

Mohammad

et al. 2012

Journal of Nanomaterials

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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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Section: Introductionmentioning

confidence: 99%

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

Mamat

Khalin

Mohammad

et al. 2012

Journal of Nanomaterials

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“…The analysis shows that calcination treatment results in more separated product with well‐defined morphology as compared to the product without calcination treatment. Different morphologies of ZnO nanomaterial have been reported as nanoflakes, nanorods,, nanospheres, nanoneedles, nanowires, nanopowder, nanofilms,, nanobelts,, nanodiscs, nanoflowers and nanotubes etc. but tubes and flowers have not been reported yet through any preparation technique.…”

Section: Resultsmentioning

confidence: 99%

Layer by Layer Assembly of Zinc Oxide Nanotubes and Nanoflowers as Catalyst for Separate and Simultaneous Catalytic Degradation of Dyes and Fuel Additive

et al. 2019

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Zinc oxide nanotubes and nanoflowers are synthesized using urea as template through hydrothermal technique. XRD confirmed that product is consists of zinc and oxygen atoms forming a hexagonal crystal system with ZnO chemical formula. SEM showed that tubes and flower like particles are formed. ATR‐IR confirmed the presence of Zn−O bond as a functional group. UV‐VIS spectroscopic analysis exhibits that product has a band gap energy of 3.49 eV. Synthesized product due to its outstanding properties such as wide band gap semiconductor and large surface area to volume ratio is used as a catalyst for individual and simultaneous catalytic degradation of methylene blue (MB) and Congo red (CR) dyes. The apparent rate constant (kapp) value of individual and simultaneous catalytic degradation of CR dye is decreased with increase in catalyst dosage while kapp value of individual and simultaneous catalytic degradation of MB dye is increased with increase in catalyst dosage. The synthesized product is found more active towards CR dye as compared to MB dye. Small size and high surface area to volume ratio of product also make it a desirable additive for enhancing the efficiency of diesel fuel. Results obtained from fuel additive activity show that as the concentration of nanoadditive is increased from 20, 40, 60, 80 and 100 ppm the calorific value is increased which indicates the enhanced efficiency of fuel due to additive.

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“…An oxygen vacancy is a donor type defect, which is different from defects that interfere with the movement of electrons and result in a decreased mobility and conductivity. Oxygen vacancies are known to play a role as electron donors in oxide nanowire channels and in the passage of current flow [15], [16], and this is assumed to be one of the main reasons for the change of the transistor characteristics. Thus, if the distribution and generation rate of the oxygen vacancies are varied by the process conditions or growth environment during the growth of the oxide nanowire, the basic characteristics of the oxide nanowire will be changed along with the transistor characteristics.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the In 2 O 3 nanowire was dispersed, and the semiconductor channels were formed. The In 2 O 3 nanowire was grown by chemical vapor deposition (CVD) using gold seeds as the catalyst [15]. The average diameter and length of the In 2 O 3 nanowires were 60 nm and 10 μm, respectively.…”

Section: F Undamental Research [1]-[3] On 1-d Nanowires Hasmentioning

confidence: 99%

Metallic, Linear, and Saturated Output Characteristics of Oxide Nanowire Transistors

Kim¹,

Kwag²,

Lee³

et al. 2012

IEEE Trans. Nanotechnology

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Ideal nanowire transistors exhibit saturation and square-law behavior in their output characteristics. The current saturation above the pinch-off voltage is an essential characteristic for transistors to be applied to a display device that is required to produce a consistent level of brightness even during long operation periods. However, fabricated oxide nanowire transistors exhibit three representative output characteristics-metallic, linearly increasing, and saturated curves-within a measurable range. In this study, through experiments and simulations using In 2 O 3 nanowire transistors, we show that fewer oxygen vacancies in the nanowire produce output characteristics more similar to ideal MOSFET characteristics. This result indicates that differences in electrical characteristics of the nanowire transistor are derived from the difference in the number of oxygen vacancies in the oxide nanowire.

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Effects of surface modification of the individual ZnO nanowire with oxygen plasma treatment

Cited by 48 publications

References 14 publications

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

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

Layer by Layer Assembly of Zinc Oxide Nanotubes and Nanoflowers as Catalyst for Separate and Simultaneous Catalytic Degradation of Dyes and Fuel Additive

Metallic, Linear, and Saturated Output Characteristics of Oxide Nanowire Transistors

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