Synthesis, microstructure and photoluminescence of well-aligned ZnO nanorods on Si substrate

Liu, Miao; Ieda, Y.; Tanemura, Sakae; Cao, Yongge; Tanemura, Masaki; Hayashi, Yûji; Toh, Shoichi; Kaneko, Kenji

doi:10.1016/j.stam.2007.02.012

Cited by 23 publications

(12 citation statements)

References 23 publications

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“…The most common methods to synthesize ZnO nanostructures are either vapor routes (usually at high temperatures, from 500–1500 °C) or solution routes (typically at temperatures below 200 °C). Commonly used vapor route techniques are vapor phase transport, − physical vapor deposition, , and chemical vapor deposition. − Frequently used solution routes are hydrothermal methods, chemical bath deposition (CBD), spray pyrolysis, electrophoresis, , and microwave-assisted thermal decomposition . Depending on the synthesis process used, three crystal forms of ZnO can be formed; rock salt which requires relatively high pressure for its formation, zinc blende which can only be synthesized using cubic substrates, and the wurtzite structure which is the thermodynamically stable phase synthesized under ambient reaction conditions. , …”

Section: Znomentioning

confidence: 99%

Interactions between Metal Oxides and Biomolecules: from Fundamental Understanding to Applications

et al. 2018

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Metallo-oxide (MO)-based bioinorganic nanocomposites promise unique structures, physicochemical properties, and novel biochemical functionalities, and within the past decade, investment in research on materials such as ZnO, TiO 2 , SiO 2 , and GeO 2 has significantly increased. Besides traditional approaches, the synthesis, shaping, structural patterning, and postprocessing chemical functionalization of the materials surface is inspired by strategies which mimic processes in nature. Would such materials deliver new technologies? Answering this question requires the merging of historical knowledge and current research from different fields of science. Practically, we need an effective defragmentation of the research area. From our perspective, the superficial accounting of material properties, chemistry of the surfaces, and the behavior of biomolecules next to such surfaces is a problem. This is particularly of concern when we wish to bridge between technologies in vitro and biotechnologies in vivo. Further, besides the potential practical technological efficiency and advantages such materials might exhibit, we have to consider the wider long-term implications of material stability and toxicity. In this contribution, we present a critical review of recent advances in the chemistry and engineering of MO-based biocomposites, highlighting the role of interactions at the interface and the techniques by which these can be studied. At the end of the article, we outline the challenges which hamper progress in research and extrapolate to developing and promising directions including additive manufacturing and synthetic biology that could benefit from molecular level understanding of interactions occurring between inanimate (abiotic) and living (biotic) materials.

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Section: Znomentioning

confidence: 99%

Interactions between Metal Oxides and Biomolecules: from Fundamental Understanding to Applications

et al. 2018

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“…It is also noted that the introduction of metal catalysts leads to the impurity level in band gap that could degrade the optical properties, and the metal catalysts may be not compatible with the COMS process in the device fabrication [185]. Naturally considering of the catathermal sublimation technique [186]. Another method without metal catalysts is MOCVD, which could also obtain the ZnO nanowires on sapphire with high optical quality [187].…”

Section: D and 2d Zno Nanostructuresmentioning

confidence: 99%

Zno Thin Films and Nanostructures for Acoustic Wave-Based Microfluidic and Sensing Applications

Peng¹,

Luo²,

Fu³

2018

Functional Materials and Electronics

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Progress in ZnO thin films and nanostructures for the acoustic wave microfluidic and sensing applications are reviewed in this chapter. ZnO thin films with good piezoelectric properties possess large electromechanical coupling coefficients and can be fabricated for the surface acoustic wave (SAW) and film-bulk acoustic resonator (FBAR) devices with a good acoustic performance. The SAWs can be excited to mix, stream, pump, eject, and atomize the liquid, and precision sensing can be performed using SAWs and FBARs. Therefore, the ZnO SAW devices are attractive to be integrated into a labon-chip system where the SAWs can transport bio-fluids to the desired area, mix the extracted DNA or proteins, and detect the changes of the signals using SAWs or FBARs. The ZnO SAW and FBAR devices in combination with different sensing layers could also be used to successfully detect gas, UV light, and biochemicals with remarkable sensitivities. 5.1 INTRODUCTION Zinc oxide (ZnO) is a binary compound via a covalent bonding between the transition-metal zinc atom and oxygen atom. ZnO thin films and nanostructures are multifunctional materials, which have attracted much attention from as early as 1930s until today due to various fundamental electronic, years, the development of new growth technologies of ZnO thin films and nanostructures and their new applications has renewed lots of interest on investigation of their growth mechanism, band structures, excitons, and deep centers in luminescence, nonlinear optics, and UV lasing [8,9]. With in-depth understanding of the semiconducting, optical, electronic, piezoelectric, and pyroelectric properties, ZnO has now been widely applied for microfluidics, These immense applications also have boosted the extensive researches on the fundamentals and growth techniques of the ZnO-based materials. typically at micron and submicron dimensions in a miniaturized system and the corresponding technologies for such systems. This multidisciplinary technology is comprehensively based on physics, nanotechnology, biotech-ZnO Thin Films and Nanostructures for Acoustic 197 the developments of the inkjet print-heads, DNA chips, and lab-on-a-chip is conveniently handled through generating, transporting, separating, consumption, high-throughput, compactness, high sensitivity, fast response, at microscale has been supported with the urgent needs from healthcare, medical research, life science, drug-development sectors. However, the and phenomena become dominant at a microscale level, such as capillary forces, surface roughness and undesired chemical interactions. These may be

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“…These include the use of surfactants (Ortiz Landeros et al 2012;Zhang et al 2009), emulsification (Binks et al 2010;Noshirvani et al 2017) external forces (Bandekar et al 2014;Guo et al 2016;Sauter et al 2008) and the use of substrates (Miao et al 2007;Zhang, Xue and Wang 2002). In principle, nanoparticles synthesized on substrates will be fixed in space and agglomeration can be prevented (Sun and Sirringhaus 2006).…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of ZnO nanoparticles grown on porous silica microparticles

et al. 2017

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ZnO nanoparticles (NPs) have been synthesized on porous silica microparticles, namely sand microparticles using the sol-gel technique. The ZnO NPs grown on the multifaceted surface of porous silica microparticles were applied as photocatalyst for the degradation of methylene blue (MB) in aqueous solution. The enhanced rate constant observed was due to two reasons. Firstly, the multifaceted surface of the sand substrate provided fixed space for growth space which prevented agglomeration of the ZnO NPs photocatalyst, thus maintaining a large surface area. Secondly, the presence of nanopores on the sand surface provided adsorption sites for MB molecules to be in the vicinity of the photocatalyst. The photocatalytic activity was significantly enhanced where photodegradation efficiency of supported ZnO NPs reached 71.7% compared to 48.2% for unsupported ZnO NPs under UV light irradiation within 150 min. The values of k increased from 4.3 9 10 -3 min -1 to 8.6 9 10 -3 min -1 for unsupported and supported ZnO NPs, respectively.

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Synthesis, microstructure and photoluminescence of well-aligned ZnO nanorods on Si substrate

Cited by 23 publications

References 23 publications

Interactions between Metal Oxides and Biomolecules: from Fundamental Understanding to Applications

Interactions between Metal Oxides and Biomolecules: from Fundamental Understanding to Applications

Zno Thin Films and Nanostructures for Acoustic Wave-Based Microfluidic and Sensing Applications

Enhanced photocatalytic activity of ZnO nanoparticles grown on porous silica microparticles

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