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Dem’yanets, L. N.; Костомаров, Д. В.; Kuz'mina, I. P.

doi:10.1023/a:1014008909633

Cited by 56 publications

(29 citation statements)

References 9 publications

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“…In light of all these factors, it is proposed that the ZnO javelin growth occurs through a different pathway under the conditions of the effective and rapid homogeneous heating of the microwave process. Based on our experimental results and the previous reports 25,43,57,64,65 the growth process can be explained as follows. The high supersaturation of Zn 2+ species at the initial stage (under the neutral pH condition) of the MW irradiation of zinc nitrate and excess urea (10 times) results in the precipitation of Zn 5 (CO 3 ) 2 (OH) 6 and ZnO nuclei according to the reaction:…”

mentioning

confidence: 70%

Microwave-assisted synthesis of ZnO micro-javelins

et al. 2009

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The microwave (MW)-assisted formation of ZnO micro-javelins from zinc nitrate and urea in aqueous solution is described. The particles (named as 'micro-javelins' because of their high aspect ratio and needle-like tips) grow hexagonally with well-defined facets in the h01 10i direction and pointed tips in (0001) direction. Powder X-ray diffraction patterns show the appearance of a strikingly dominant (1000) orientation. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations reveal the morphological evolution of these hexagonal ZnO particles with time. The effect of precursor concentrations, counterion type and MW irradiation power and their consequent influence on pH and Zn 2+ ion concentration are investigated. A mechanism for the formation of the micro-javelins is postulated. The microwave induced supersaturation of Zn(OH) + species under the weakly basic pH condition and the initial growth through the (000 1) direction (oxygen-rich face) are proposed to be the key factors that dictate the formation of these ZnO micro-javelins. The present one-step microwave process is a straightforward and a reproducible method for the bulk synthesis of defect-free ZnO micro-javelins, which would find potential applications in microelectronic devices (e.g. lasers, cantilevers in surface probing equipment, etc.).

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confidence: 70%

Microwave-assisted synthesis of ZnO micro-javelins

et al. 2009

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“…This is one of the reasons why ZnO has attracted a lot of interest for developing nanogenerators [1]. The synthesis of aligned ZnO NW arrays has been studied [9,10] during the past several years due to the various potential applications of aligned ZnO NW arrays in light emitting diodes [11][12][13], lasers [14,15], solar cells [16][17][18], nanogenerators [19][20][21] and piezotronics [22,23], etc. Various methods have been reported for synthesizing ZnO NW arrays, mainly including physical vapor phase transport and deposition [24][25][26], metal organic chemical vapor deposition (MOCVD) [27,28] and the low temperature hydrothermal approach [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Handwriting enabled harvested piezoelectric power using ZnO nanowires/polymer composite on paper substrate

et al. 2014

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We here, present a flexible handwriting driven nanogenerator (NG) based on zinc oxide (ZnO) nanowires (NWs)/polymer composite grown/deposited on paper substrate. The targeted configuration is composed of ZnO NWs/PVDF polymer ink pasted and sandwiched between two pieces of paper with ZnO NWs grown chemically on one side of each piece of paper.Other configurations utilizing a ZnO/PVDF ink with different ZnO morphology on paper platform and others on plastic platform were fabricated for comparison. The mechanical pressure exerted on the paper platform while handwriting is then harvested by the ZnO NWs/polymer based NG to deliver electrical energy. Two handwriting modes were tested; these were slow (low pressure) and fast (high pressure) handwriting. The maximum achieved harvested open circuit voltage was 4.8 V. While an out power density as high as 1.3 mW/mm 2 was estimated when connecting the NG to a 100 Ω load resistor. The observed results were stable and reproducible. The present NG provides a low cost and scalable approach with many potential applications, like e.g. programmable paper for signature verification.

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“…As shown in the Eqns 1-5, the major reactions involved in the synthesis are illustrated [165][166]. According to eqn 2, Zn(OH) 4 2-is not necessarily the product, can also exist as Zn(OH) 2 or Zn(OH) + , this thus depend on the operational parameters which include the pH value and concentration of Zn 2+ as exposed in Fig.…”

Section: Zno Growth In General Alkaline Solutionsmentioning

confidence: 99%