Application of ITO films to photocatalysis

Yumoto, Hisami; Inoue, Takashi; Li, S.J.; Sako, T; Nishiyama, Kozaburo

doi:10.1016/s0040-6090(99)00094-2

Cited by 102 publications

(54 citation statements)

References 9 publications

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“…Zinc oxide (ZnO), an important II-VI semiconductor with a bandgap of 3.37 eV and a large exciton binding energy of 60 meV, has been extensively studied because of its potential applications in solar cells, [1] sensors, [2,3] photocatalysis, [4] etc. Over the past few years, tremendous efforts have been made to synthesize diverse nanometer-scaled ZnO building blocks (e.g., nanoparticles, nanowires, nanobelts, nanotubes, and nanosheets) with controlled sizes and morphologies.…”

Section: Introductionmentioning

confidence: 99%

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

Cai

Zhang

2008

Adv Funct Materials

594

345

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A novel ZnO hierarchical micro/nanoarchitecture is fabricated by a facile solvothermal approach in an aqueous solution of ethylenediamine (EDA). This complex architecture is of a core/shell structure, composed of dense nanosheet‐built networks that stand on a hexagonal‐pyramid‐like microcrystal (core part). The ZnO hexagonal micropyramid has external surfaces that consist of a basal plane (000${\bar 1}$) and lateral planes {0${\bar 1}$11}. The nanosheets are a uniform thickness of about 10 nm and have a single‐crystal structure with sheet‐planar surfaces as {2${\bar 1}\,{\bar 1}$0} planes. These nanosheets interlace and overlap each other with an angle of 60° or 120°, and assemble into a discernible net‐ or grid‐like morphology (about 100 nm in grid‐size) on the micropyramid, which shows a high specific surface area (185.6 m2 g−1). Such a ZnO micro/nanoarchitecture is new in the family of ZnO nanostructures. Its formation depends on the concentration of the EDA solution as well as on the type of zinc source. A two‐step sequential growth model is proposed based on observations from a time‐dependent morphology evolution process. Importantly, such structured ZnO has shown a strong structure‐induced enhancement of photocatalytic performance and has exhibited a much better photocatalytic property and durability for the photodegradation of methyl orange than that of other nanostructured ZnO, such as the powders of nanoparticles, nanosheets, and nanoneedles. This is mainly attributed to its higher surface‐to‐volume ratio and stability against aggregation. This work not only gives insight into understanding the hierarchical growth behaviour of complex ZnO micro/nanoarchitectures in a solution‐phase synthetic system, but also provides an efficient route to enhance the photocatalytic performance of ZnO, which could also be extended to other catalysts, such as the inherently excellent TiO2, if they are of the same hierarchical micro/nanoarchitecture with an open and porous nanostructured surface layer.

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Section: Introductionmentioning

confidence: 99%

ZnO Hierarchical Micro/Nanoarchitectures: Solvothermal Synthesis and Structurally Enhanced Photocatalytic Performance

Cai

Zhang

2008

Adv Funct Materials

594

345

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show abstract

“…Especially, for the past few years, substantial efforts have been devoted to control the architecture and spatial patterning of metal oxide semiconductor materials. Among various transition metal oxides and their derivatives, zinc oxide (ZnO) have attracted a great deal of interest because of their intriguing optical, electronic, and mechanical properties and potential applications in optoelectronics, photonics, field emission, energy conversion, catalysis, and sensors [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of ZnO nanostructures on a zinc substrate assisted with mixed cationic/anionic surfactants

Wang

Zhou

et al. 2009

Journal of Alloys and Compounds

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“…Nanocrystalline ZnO as a wide band semiconductor has attracted more and more attention over the past few years due to its potential applications in solar cells [1], chemical sensors [2], photocatalysis [3], optoelectronics [4], and field emission [5]. Especially zinc oxide is thought to be the most suitable material for an ultraviolet (UV) laser device due to its direct wide band gap (3.37 eV) and large exciton binding energy (60 meV).…”

Section: Introductionmentioning

confidence: 99%