Aggregation-induced growth of hexagonal ZnO hierarchical mesocrystals with interior space: nonaqueous synthesis, growth mechanism, and optical properties

Wang, Hequan; Xin, Ling; Wang, Hai; Yu, Xiao; Liu, Yong; Zhou, Xiang; Li, Baojun

doi:10.1039/c3ra23010d

Cited by 21 publications

(19 citation statements)

References 47 publications

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“…10f) which may be due to the Ostwald ripening [44][45]. It is obvious from the images that the shapes of the grains of all the three top layers resemble with their bottom layer counterparts.…”

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confidence: 94%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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A triple layer system (TaZO/Ag/TaZO) consists of tantalum doped zinc oxide (TaZO) as the top and bottom layers and metallic silver (Ag) as the intermediate layer was deposited onto glass substrates. The top and bottom layers were deposited using an inexpensive homemade Automated Jet Nebulizer Spray Technique (AJNSP) and the intermediate Ag layer was deposited using thermal evaporation technique. Three different sets of samples with top and bottom layers having thickness values around 50, 75 and 100 nm were prepared keeping the thickness of the middle layer constant (15 nm). The influence of thickness on structural,electrical, optical and photoluminescence properties along with surface morphology of the deposited triple layer system was studied. Structural study revealed that the deposited films have hexagonal wurzite structure of ZnO and x-ray photoelectron spectroscopic study confirms the presence of the expected elements in the system. Optical studies show that the overall thickness of the films influences only marginally the transmittance of the films. The decrease in sheet resistance with the increase in thickness is explained on the basis of grain boundary scattering mechanism. Among all the films examined, the multi-layer film with 75+15+75 nm thickness exhibits best quality factor (8.98 × 10 -3 (Ω/sq.) -1 ), which may be considered as a potential candidate for transparent electrode applications. To the best of our knowledge, this is the first report in which a low cost chemical technique is employed to fabricate a triple layered system. ________________________________________________________________________________________________________________

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confidence: 94%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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“…This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , [13][14][15][16][17][18][19][20][21][22][23] ZnO, [24][25][26][27][28][29][30][31][32][33][34] hematite (a-Fe 2 O 3 ), [35][36][37][38][39][40] maghemite (g-Fe 2 O 3 ), 41 Co 3 O 4 , 42 SnO, [43][44][45] Ag 2 O, 46 CuO [47][48][49] ), metal chalcogenides (for example, ZnS, 50,51 PbS, 52 PbSe 53,54 ), metals (for example, Au, 55 Ag, 56,57 Cu, 58 Pt, 59,60 Pd 61 ), organic compounds (for example, DL-alanine, 62,63…”

Section: Introductionmentioning

confidence: 99%

“…This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , 13-23 ZnO, [24][25][26][27][28][29][30][31][32][33][34] Among metal oxides, TiO 2 is used in many applications that deal with environmental and energy problems (for example, photodegradation of pollutants, 67 water splitting for H 2 evolution, 68 dyesensitized solar cells 68 and lithium-ion batteries 69 ) owing to its …”

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confidence: 99%

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

Tachikawa

Majima

2014

NPG Asia Mater

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Mesocrystals (MCs) are superstructures with a crystallographically ordered alignment of nanoparticles. Owing to their organized structures, MCs posses some unique characteristics such as a high surface area, pore accessibility, and good electronic conductivity and thermal stability; thus, MCs could be beneficial for many areas of research and application. This review begins with a description of the common synthesis strategies for, and characterization and fundamental properties of metal oxide MCs. Newly developed analytical methods (that is, photoconductive atomic force microscopy and single-molecule, single-particle fluorescence microscopy) for unraveling the charge transport and photocatalytic properties of individual MCs are then introduced. Further, recent developments in the applications of various metal oxide MCs, especially in the fields of energy conversion and storage, are also reviewed. Finally, several perspectives in terms of future research on MCs are highlighted. NPG Asia Materials (2014) 6, e100; doi:10.1038/am.2014.21; published online 16 May 2014 Keywords: energy storage; mesocrystal; metal oxide; photocatalysis; solar energy conversion; superstructure INTRODUCTIONThe self-assembly of nanoparticle building blocks into highly ordered superstructures is one of the actively pursued research topics in materials science and technology. 1-4 Such hierarchical architectures have potentially tunable electronic, optical and magnetic properties, which promise various applications ranging from catalysis to optoelectronics. A mesocrystal (MC), which was first introduced by Cölfen in the early years of 2000s, is defined as a superstructure consisting of nanoparticles on the scale of several hundred nanometers to micrometers. [5][6][7][8][9][10][11] In contrast to the classical mechanism of atom/ ion-mediated growth of a single crystal, the particle-mediated growth mechanisms of MCs are termed as non-classical crystallization (Figure 1). This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , 13-23 ZnO, [24][25][26][27][28][29][30][31][32][33][34] Among metal oxides, TiO 2 is used in many applications that deal with environmental and energy problems (for example, photodegradation of pollutants, 67 water splitting for H 2 evolution, 68 dyesensitized solar cells 68 and lithium-ion batteries 69 ) owing to its

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“…Despite the flourishing emergence of reports on the fabrication of mesocrystals, the history of mesocrystal synthesis is closely related to the continuous exploitation of mesocrystals with new compositions and the persistent development of synthetic procedures having advantages in terms of low cost, convenience in handling, and easiness in compositional and structural control [35][36][37][38][39][40][41]. To date, mesocrystals with a broad range of compositions involving metal oxides (e.g., TiO2 , ZnO [69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85], Fe2O3 [86][87][88][89][90][91][92][93][94][95], CuO [96][97][98][99][100][101], SnOx [102,103], Co3O4 [104][105][106][107]…”

Section: Introductionmentioning

confidence: 99%

“…Although significant attention has been directed to fabricating TiO2 mesocrystals with controlled morphologies, the realization of TiO2 mesocrystals is always a challenging task, probably because the titanium precursors used are highly reactive, and it is rather difficult to precisely control the growth dynamic of TiO2 crystals. Additionally, considering To date, mesocrystals with a broad range of compositions involving metal oxides (e.g., TiO 2 , ZnO [69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85], Fe 2 O 3 [86][87][88][89][90][91][92][93][94][95], CuO [96][97][98][99][100][101], SnOx [102,103], Co 3 O 4 [104][105][106][107][108], Ag 2 O [109]), metal chalcogenides (e.g., ZnS [110], PbS [111][112][113],Ag 2 S [114], PbS...…”

Section: Introductionmentioning

confidence: 99%

Titanium Dioxide (TiO2) Mesocrystals: Synthesis, Growth Mechanisms and Photocatalytic Properties

Zhang

Cao

et al. 2019

Catalysts

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Hierarchical TiO2 superstructures with desired architectures and intriguing physico-chemical properties are considered to be one of the most promising candidates for solving the serious issues related to global energy exhaustion as well as environmental deterioration via the well-known photocatalytic process. In particular, TiO2 mesocrystals, which are built from TiO2 nanocrystal building blocks in the same crystallographical orientation, have attracted intensive research interest in the area of photocatalysis owing to their distinctive structural properties such as high crystallinity, high specific surface area, and single-crystal-like nature. The deeper understanding of TiO2 mesocrystals-based photocatalysis is beneficial for developing new types of photocatalytic materials with multiple functionalities. In this paper, a comprehensive review of the recent advances toward fabricating and modifying TiO2 mesocrystals is provided, with special focus on the underlying mesocrystallization mechanism and controlling rules. The potential applications of as-synthesized TiO2 mesocrystals in photocatalysis are then discussed to shed light on the structure–performance relationships, thus guiding the development of highly efficient TiO2 mesocrystal-based photocatalysts for certain applications. Finally, the prospects of future research on TiO2 mesocrystals in photocatalysis are briefly highlighted.

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Aggregation-induced growth of hexagonal ZnO hierarchical mesocrystals with interior space: nonaqueous synthesis, growth mechanism, and optical properties

Cited by 21 publications

References 47 publications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

Titanium Dioxide (TiO2) Mesocrystals: Synthesis, Growth Mechanisms and Photocatalytic Properties

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