Synthesis of ZnO Nanocrystals

Zhang J, Wen B, Wang F, Ding Y, Zhang S, Yang M (2011) In situ synthesis of ZnO nanocrystal/PET hybrid nanofibers via electrospinning. J Poljrm Sd B Poljm Phys 49 1360-1368... 

Reaction Synthesis of ZnO nanocrystals based on the hydrolysis reaction. 

Reaction System This example describes the synthesis of ZnO nanocrystals based on the hydrolysis reaction at room temperature according to the procedure reported by Choi et al. [104]. The hydrolysis ratio is increased with an increase of reaction pH yielding zinc aquo-hyroxo ions [Zn(OH2)4 (OH)J , the precursor for the nucleation of the ZnO NCs. Once sufficient amounts of the precursors are present in the aqueous medium, the ZnO forms nuclei via the condensation reaction. The subsequent condensation reaction continues by diffusion and adsorption of the precursors, leading to the formation of ZnO NCs. The precursors are bridged by... 

MW-HT techniques can shorten the reaction time. For example, Ivanov et al. [38] synthesized ZnO nanocrystals in 10 min with the assistance of microwave hydro-thermal methods. Huang et al. [39] also demonstrated the use of microwave radiation in the hydrothermal synthesis of ZnO complex nanostructures. These nanocrystals showed high photocatalytic activity in a model reaction of Methyl Orange photodegradation. Li et al. [40] synthesized W03 nanorods in 20 min and showed high... 

Liu, Z. Sun, Z. Han, B., Zhang, J. Huang, J. Du, J. Miao, S. (2006) Microwave-Assisted Synthesis of Pt Nanocrystals and Deposition on Carbon Nanotubes in Ionic Liquids, / Nanosci Nanotech, 2006,6,1,175-179,1550-7033 Movahedi, M. Kowsari, E. Mahjoub, A. R. Yavari, I. (2008) A task specific basic ionic liquid for synthesis of flower-like ZnO by hydrothermal method. Mater lett, 62, 23, 3856-3858, 0167-577X... 

Figure 6. ZnO band-gap (a) intensities and (b) energies collected during synthesis of Co2+-doped ZnO nanocrystals, plotted versus initial dopant concentration. [Adapted from (52).]...

To elucidate a possibility of synthesis of N-doped, In-N codoped and p-type ZnO nanocrystals we used the electrical discharge between Zn-Zn and Zn-ln electrodes immersed into 10% aqueous ammonia solution. Material composition, optical and electrical properties of the products where studied. 

Similarly, C o was converted into MWCNTs above 700°C via amorphous carbon under hydro-thermal conditions [119], SWCNTs under hydrothermal conditions can only survive mild- and short-term treatment in high-temperature, high-pressure water. With time, SWCNTs gradually transform into MWCNTs and polyhedral graphitic nanoparticles [35]. Both carbon filaments and MWCNTs are produced using ferrocene, Fe, or Fe/Pt nanocrystals at supercritical toluene at 600°C and 12.4 MPa. In this study, toluene serves as both the carbon source for nanotube formation and as a solvent [154]. Recently, direct synthesis of MWCNTs/CdS, MWCNT/ZnO, Ti/CNT, FeO/ MWCNTs, and CNT-F-doped Sn02 nanocomposites under hydrothermal process has been used for various applications [155-159]. 

Viswanatha R, Sarma DD (2006) Study of the growth of capped ZnO nanocrystals a route to rational synthesis. Chem Eur J 12 180-186... 

Zhou, Y. Antonietti, M. (2003). Synthesis of very small Ti02 nanocrystals in a room-temperature ionic liquid and their self-assembly toward mesoporous spherical aggregates. / Am Chem Soc 125, 49,14960-14961, 0002-7863 Zhu, H. Huang, J. Pan, Z. Dai, S. (2006). lonothermal Synthesis of Hierarchical ZnO Nanostructures from Ionic-Liquid Precursors. Chem Mater, 18,18, 4473-4477, 0897-4756... 

Xie, R. Kolb, U. Li, I Basche,T. Mews, A. 2005. Synthesis and characterization of highly luminescent CdSe-core CdS/Zno.sCdo.sS/ZnS multishell nanocrystals. J. Amer. Chem. Soc. 127 7480-7488. 

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