ZnO Nanowalls Grown with High-Pressure PLD and Their Applications as Field Emitters and UV Detectors

Cao, Bingqiang; Matsumoto, Takafumi; Matsumoto, Masato; Higashihata, Mitsuhiro; Nakamura, Daisuke; Okada, Tatsuo

doi:10.1021/jp902603s

Cited by 64 publications

(45 citation statements)

References 45 publications

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“…Although the UV sensing mechanism of the 2D ZnO structures is basically the same as that of the other form of ZnO structures, due to their high specific surface area, the 2D ZnO photodetector shows higher sensitivity as can be noticed from Table 1 [9,55,59]. In comparison with 1D ZnO structures, the growth of 2D ZnO nanostructures is much more difficult partially due to its hexagonal polar structure.…”

Section: Uv Detection Mechanisms In 2d Zno Structuresmentioning

confidence: 95%

“…Furthermore, the strong dependence of the PL peak locations and intensities of ZnO nanostructures on the size and shape of the nanostructures was noted [35,61]. Several 2D ZnO structures, such as 2D plate [27], nanodisk [35], and nanosheet [59] ZnO structures, show low intensity of the near edge UV emission, which was attributed to the surface states being nonradioactive centres due to their large surface-to-volume ratio [60] and higher intensity in the visible broadband. This was attributed to the wide surface area of the 2D structures that make the density of surface defects higher compared to the other ZnO structures, such as nanorods and nanowires [57,60].…”

Section: Optoelectronics -Advanced Device Structuresmentioning

confidence: 98%

“…This UV emission had been attributed to different origins; it may be attributed to either excitonic or defect-related emission [59]. It was also attributed to the near band-edge emission of ZnO (3.37 eV) [35].…”

Section: Optoelectronics -Advanced Device Structuresmentioning

confidence: 99%

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Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Al-Hardan¹,

Hamid²,

RoslindaShamsudin³

et al. 2017

Optoelectronics - Advanced Device Structures

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In this chapter, we review the application of zinc oxide (ZnO) in ultraviolet (UV) sensing and emphasise on the two-dimensional (2D) ZnO structures. The synthesis of 2D ZnO structures, the morphologies, and the photoluminescence emission will be reviewed and highlighted. The performance of the UV sensors based on 2D ZnO structures is explored. The lack in the study of the 2D ZnO UV sensors might be due to the difficulties of controlling the growth of the 2D ZnO compared to the one-dimensional (1D) ZnO structures.

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Section: Uv Detection Mechanisms In 2d Zno Structuresmentioning

confidence: 95%

Section: Optoelectronics -Advanced Device Structuresmentioning

confidence: 98%

See 1 more Smart Citation

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Al-Hardan¹,

Hamid²,

RoslindaShamsudin³

et al. 2017

Optoelectronics - Advanced Device Structures

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“…The edges of the NWalls grown on Al wire (Al 95 %, copper 4 %, manganese 1 %) were found to be particularly sharp (5 nm tips) and offer interesting potential for applications as field emitters [16].…”

Section: Resultsmentioning

confidence: 99%

Sonochemical approach for rapid growth of zinc oxide nanowalls

et al. 2012

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The sonochemical process drives chemical reactions with sound fields by creating extraordinarily high density of energy, pressure and temperatures. The process resulted in a number of unexpected chemical species and thought-provoking results in the recent past. In this paper, we present a new sonochemical approach to synthesize ZnO (zinc oxide) nanowalls (NWalls) on aluminum and alumina coated substrates at room ambient conditions. We achieved highly dense and uniform ZnO NWalls in areas that are coated with Al or Al 2 O 3 (alumina). The synthesis process was shown not to occur on Si, SiO 2 , Cr, or Ag surfaces. A series of experiments on understanding the growth kinetics offers detailed insight into the growth dynamics over time. Photoluminescence (PL) measurements, UV Vis spectroscopy, and SEM-EDS results confirm NWalls composed of crystalline ZnO that are formed via Al assisted growth induced by phase transformations under extraordinary pressure, temperature, and chemical growth kinetics. The chemical growth method as reported here, is applicable to arbitrary A.P. Nayak · A.M. Katzenmeyer · M.S. Islam ( ) substrates coated with an Al thin film. We demonstrate the applications of the as-formed NWalls in UV photoconductors and gas sensors.

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“…2D nanostructures have many special potential applications in electrical, optical, photochemistry, sensors and ion-exchange properties. [2,3,4] Relative to the comprehensive investigations of zero-and one-dimensional (1D) nanostructures, 2D nanostructures have almost been neglected over the last decade. One important reason is the synthesis of single-crystalline 2D nanostructures is more difficult to control.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

Azimirad

Khosravi

Moshfegh

2011

Surface & Interface Analysis

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A simple method for synthesis of W 17 O 47 nanothick plates by annealing sol-gel-deposited tungsten oxide thin films on soda lime substrate has been reported. After heat treatment of the dried thin films at 700• C in N 2 ambient for 60 min, W 17 O 47 nanothick plates with [100] orientation were obtained. The synthesized product was characterized and analyzed by, X-ray diffraction (XRD), SEM, XPS and ultraviolet-visible spectrophotometery. According to SEM observations, nanothick plates grew with random orientations on the surface. In addition, it was observed that some of the nanothick plates were constituted from several nanosheets. XRD analysis determined that the nanothick plates were mainly composed of monoclinic W 17 O 47 phase with strong (500) diffraction peak and about 50 nm average crystalline size. Basing on XPS analysis, the surface composition of the nanothick plates was determined WO 2.78 . It was found that the 60 min annealed sample has the maximum number of nanothick plates per unit area over the surface as compared to the samples annealed for 15, 45 and 80 min. In addition, the photocatalytic degradation of methylene blue over this sample exhibited the highest photoactivity rate. A mechanism for photocatalytic activity of the W 17 O 47 nanothick plates was also proposed.

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ZnO Nanowalls Grown with High-Pressure PLD and Their Applications as Field Emitters and UV Detectors

Cited by 64 publications

References 45 publications

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Sonochemical approach for rapid growth of zinc oxide nanowalls

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

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ZnO Nanowalls Grown with High-Pressure PLD and Their Applications as Field Emitters and UV Detectors

Cited by 64 publications

References 45 publications

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

Sonochemical approach for rapid growth of zinc oxide nanowalls

Synthesis of W17O47 nanothick plates with preferred orientation and their photocatalytic activity

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Product

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Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity