Large-scale fabrication of ZnO micro-and nano-structures by microwave thermal evaporation deposition

Cheng, Hongbin; Cheng, Jiping; Zhang, Yunjin; Wang, Qing Ming

doi:10.1016/j.jcrysgro.2006.10.245

Cited by 92 publications

(47 citation statements)

References 22 publications

(22 reference statements)

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“…The S2 sample shows peaks of ZnO phase with 21% of byproducts such as ZnCO 3 and NaNO 3 between 200 and 600 o C, which decomposed with the increase in the temperature, originating pure phase of ZnO above 800 o C. Figure 3 shows infrared spectra of the ZnO samples (S1 and S2) treated at various temperatures. The spectra show bands (3500 cm −1 ) assigned to OH − stretching vibrations of crystalline and adsorbed H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Influence of drying on the characteristics of zinc oxide nanoparticles

Rezende¹,

Silva

Mohallem³

2009

Braz. J. Phys.

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The recent growth in the field of porous and nanometric materials prepared by non-conventional processes has stimulated the search of new applications of ZnO nanoparticulate. Zinc oxide is an interesting semiconductor material due to its application on solar cells, gas sensors, ceramics, catalysts, cosmetics and varistors. In this work, the precipitation method was used followed by controlled and freezing drying processes. The materials obtained were thermally treated at various temperatures. The influence of temperature on structural, textural, and morphological properties of the materials was studied by powder X-ray diffraction, infrared spectroscopy, scanning electron microscopy, nitrogen adsorption, and thermal analysis. The characteristics of both materials were compared.

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Section: Resultsmentioning

confidence: 99%

Influence of drying on the characteristics of zinc oxide nanoparticles

Rezende¹,

Silva

Mohallem³

2009

Braz. J. Phys.

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“…The use of microwave power of 100 W seemed inadequate since it formed poorly crystalline, irregular mesoporous MSN structures with a small surface area. Since to the electromagnetic field generated by microwaves affects the enhancement of crystal growth, a low microwave power with a short irradiation time was probably insufficient to provide the homogeneous heating required for optimal crystal growth [15]. The irregularities in the structure were presumed to be a consequence of the formation of ''hot spots'' at certain locations in the microwave reactor.…”

Section: Figure 2 X-ray Diffraction Patterns Of All Msnsmentioning

confidence: 99%

Microwave-Assisted Synthesis of Mesoporous Silica Nanoparticles as a Drug Delivery Vehicle

Kamarudin

Jalil

Triwahyono

et al. 2016

MJAS

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Nanotechnology has been utilized in medicine for therapeutic drug delivery and the development of treatments for a variety of diseases and disorders. Mesoporous silica nanoparticles (MSN), which combine both unique properties of nanomaterials and mesostructured substances, have aroused special attention in biomedical research field due to its great advantages in many aspects such as well biocompatible, unique properties of tunable pore size and structure, large surface areas and pore volumes, controllable morphology and modifiable surfaces, high chemical and thermal stabilities. In this study, the microwave was utilized to synthesize MSN under 100 W, 300 W and 450 W heating powers. All MSNs was tested for adsorption and release of an anti-inflammatory and anti-cancer drug, ibuprofen. The characterization revealed that the MSN prepared under 450 W (MSN450) produced the most ordered and prominent mesoporous structure compared to lower power applied. MSN450 exhibited the highest ibuprofen adsorption, followed by MSN300 and MSN100, confirming that more ordered MSN demonstrated higher adsorptivity toward ibuprofen. For the release study, MSN450 showed the slowest release rate of ibuprofen, followed by MSN300 and MSN100. All MSNs was found to exhibit good activity for the ibuprofen adsorption and release. Keywords: microwave, mesoporous silica, ibuprofen, adsorption, drug delivery AbstrakTeknologi nano telah digunakan dalam bidang perubatan untuk penyampaian ubat terapeutik dan pembangunan rawatan untuk pelbagai penyakit dan gangguan. Partikel nano silika mesoliang, yang menggabungkan kedua-dua ciri-ciri yang unik bahan nano dan bahan struktur meso, telah membangkitkan perhatian khusus dalam bidang penyelidikan bioperubatan kerana kelebihan yang besar dalam banyak aspek seperti bioserasi, ciri-ciri unik bolehubah saiz liang dan struktur, kawasan permukaan dan isipadu liang yang besar, morfologi bolehkawal dan permukaan boleh ubahsuai, serta tinggi kestabilan kimia dan haba. Dalam kajian ini, gelombang mikro telah digunakan untuk mensintesis partikel nano silika mesoliang (MSN) dibawah kuasa pemanasan 100 W, 300 W dan 450 W. Semua MSN telah diuji untuk penjerapan dan pembebasan ubat anti-radang dan anti-kanser, ibuprofen. Pencirian mendedahkan bahawa MSN yang disediakan di bawah 450 W (MSN 450 ) menghasilkan struktur paling tersusun dan terbaik dibandingkan dengan kuasa lebih rendah. MSN 450 telah mencapai penjerapan ibuprofen tertinggi, diikuti dengan MSN 300 dan MSN 100 , mengesahkan bahawa MSN yang lebih tersusun menunjukkan penjerapan ibuprofen lebih tinggi. Untuk kajian

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“…The UV emission is assumed to correspond to the near band edge emission of the wide band gap of ZnO due to the annihilation of excitons [22]. The blue emission bands are possibly attributed to the deep-level defect [23], and blue-green ones are related to the singly ionized oxygen vacancy [24] in ZnO and result from the recombination of a hole with the single ionized charge state of this defect. The blue and blue-green emissions imply that there are a few surface defects in ZnO hexagonal tubes which are caused by the vacancies in the crystal structure.…”

Section: Optical Properties Of Zno Microtubesmentioning

confidence: 99%

Rapid growth of ZnO hexagonal tubes by direct microwave heating

Zhu

Zhou

2010

Int J Miner Metall Mater

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Zinc oxide hexagonal tubular crystals were synthesized by direct microwave heating from ZnO powders within 5 min without any metal catalysts or transport agents. ZnO source materials were evaporated from the high-temperature zone in an enclosure, and crystals were grown on the self-source substrate in an appropriate condition. The ZnO vapor formed in the high-temperature zone can deposit and grow on the powders located in the low-temperature zone to form crystals. The scanning electron microscopy (SEM) reveals that these products are hexagonal tube crystals with 80 μm in diameter and 250 μm in length, having a well faceted end and side surface. A possible growth mechanism and the influence of reaction temperature on the formation of crystalline ZnO hexagonal tubes were presented. The photoluminescence (PL) exhibits strong ultraviolet emission at room temperature, indicating the potential applications in short-wave light-emitting photonic devices.

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Large-scale fabrication of ZnO micro-and nano-structures by microwave thermal evaporation deposition

Cited by 92 publications

References 22 publications

Influence of drying on the characteristics of zinc oxide nanoparticles

Influence of drying on the characteristics of zinc oxide nanoparticles

Microwave-Assisted Synthesis of Mesoporous Silica Nanoparticles as a Drug Delivery Vehicle

Rapid growth of ZnO hexagonal tubes by direct microwave heating

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