Hydrothermal synthesis of alumina nanotubes templated by anionic surfactant

Qu, Lihong; He, Chaoliang; Yang, Yue; He, Yanli; Liu, Zhongmin

doi:10.1016/j.matlet.2005.07.059

Cited by 95 publications

(57 citation statements)

References 28 publications

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“…The surfactant-assisted hydrothermal method is a clear example of a bottom-up method for the synthesis of nanostructured ceramics [3,25], wherein different products exposing unique morphologies could be obtained as a result of surfactant acting as soft templates or growth-directing agent [71,[75][76][77][78][79][80][81][82][83][84][85][86][87]. For instance, Zhao et al [75] prepared crystalline calcium carbonate particles (CaCO 3 ) through the surfactant-assisted hydrothermal method.…”

Section: Surfactant-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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Section: Surfactant-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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“…Al 2 O 3 is a wide band-gap (*6 eV at 300 k for bulk material) dielectric material which can exist in different crystalline forms such as gamma, delta, theta and alpha phases. Many techniques were used to prepare Al 2 O 3 nanoparticles such as sol-gel (Mirjalili et al 2010), sputtering (Trinh et al 2008), spray (Kavitha and Jayaram 2006), hydrothermal (Qu et al 2005), mechanical milling (Reid et al 2008) and laser ablation (Yatsui et al 2000). Synthesis of nanoparticles by pulsed laser ablation in liquid (PLAL) has many advantages compared to other conventional techniques: the produced nanoparticles are pure and have no impurities; the process does not need any complex agents; a large variety of materials may be synthesized; material stoichiometry is preserved; there is fair control on the size of the produced nanoparticles; the process is cost-effective and fast (Petersen and Barcikowski 2009;Yang et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of aluminum oxide nanoparticles by laser ablation in liquid as passivating and anti-reflection coating for silicon photodiodes

2017

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In this study, we have prepared aluminum oxide (Al 2 O 3 nanoparticles) NPs with size ranging from 50 to 90 nm by laser ablation of aluminum target in ethanol. The effect of laser fluence on the structural, morphological and optical properties of Al 2 O 3 was demonstrated and discussed. X-ray diffraction XRD results confirm that the synthesized Al 2 O 3 NPs are crystalline in nature. The sample prepared at 3.5 J/cm 2 /pulse exhibits single phase of c-Al 2 O 3 , while the XRD patterns of the nanoparticles synthesized at 5.3 and 7.5 J/cm 2 /pulse show the co-existence of the a-Al 2 O 3 and c-Al 2 O 3 phases. Nanostructured Al 2 O 3 films have been used as anti-reflecting coating and surface passivation layer to improve the photoresponse characteristics of silicon photodiode. The experimental data showed that the optical energy gap decreases from 5.3 to 5 eV as the laser fluence increases from 3.5 to 7.3 J/cm 2 . The lowest optical reflectivity was found for silicon photodiode deposited with a single layer of Al 2 O 3 prepared at 3.5 J/cm 2 /pulse. The effect of laser fluence on the refractive index and extinction coefficient of the nanostructured Al 2 O 3 film was studied. The photosensitivity of the silicon photodiode increased from 0.4 to 1.4 AW -1 at 800 nm after depositing Al 2 O 3 prepared at 3.5 J/cm 2 /pulse, followed by rapid thermal annealing at 400°C for 60 s.

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“…22 Amongst these, hydrothermal methods are popular as they are cheap, reproducible, simple and can be easily scaled up. There are numerous published reports of hydrothermal syntheses of g-Al 2 O 3 using structure directing agents (SDAs) such as surfactants [7][8][9] and polymers, 1,23 which function as a template. However, these additives can affect the product crystallinity and SDAs can be hard to remove completely from the nal materials.…”

Section: Introductionmentioning

confidence: 99%

γ-Al₂O₃nanorods with tuneable dimensions – a mechanistic understanding of their hydrothermal synthesis

et al. 2017

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This paper reports for the first time the size control of well-defined and morphologically pure alumina (gAl 2 O 3 ) nanorods, presenting an economic and reproducible route for the manufacture of these materials with tuneable sizes for useful applications, for example serving as adsorbents, catalysts and catalyst supports. A detailed understanding of the different steps taking place during the hydrothermal synthesis has been deduced herein. Understanding the effect of temperature on the relative rates of these steps is essential for achieving size and morphology selectivity, but has often been overlooked in the literature.This systematic study identifies six distinct steps taking place during the synthesis: (1)

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Hydrothermal synthesis of alumina nanotubes templated by anionic surfactant

Cited by 95 publications

References 28 publications

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Preparation and characterization of aluminum oxide nanoparticles by laser ablation in liquid as passivating and anti-reflection coating for silicon photodiodes

γ-Al₂O₃nanorods with tuneable dimensions – a mechanistic understanding of their hydrothermal synthesis

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Hydrothermal synthesis of alumina nanotubes templated by anionic surfactant

Cited by 95 publications

References 28 publications

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Preparation and characterization of aluminum oxide nanoparticles by laser ablation in liquid as passivating and anti-reflection coating for silicon photodiodes

γ-Al2O3nanorods with tuneable dimensions – a mechanistic understanding of their hydrothermal synthesis

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γ-Al₂O₃nanorods with tuneable dimensions – a mechanistic understanding of their hydrothermal synthesis