The Synthesis and Optical Properties of ZnO Nanocombs

Zang, Chunhe; Liu, Yichun; Zhao, Dan; Zhang, J Y; Shen, Dayong

doi:10.1166/jnn.2010.2480

Cited by 8 publications

(6 citation statements)

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“…Statistical analysis on many SEM images shows that the dimensions of the combs are: teeth length l = (580 ± 160) nm, teeth period a = (180 ± 20) nm, teeth diameter and body height d = (79 ± 6) nm and body width w = (190 ± 40) nm. Figure 1(b) shows hexagonal shaped teeth tips, supporting the fact that the growth direction of those nanowires is along the c axis of wurtzite ZnO, as has been reported in other similar works [27,28]. Room temperature optical spectra were obtained by using a linearly polarized Ti:Sapphire (Ti:Sa) pulsed laser as the excitation source, with 180 mW of average power and 70 fs pulse width with a repetition rate of 90 MHz.…”

Section: Experimental Setup and Sample Growingsupporting

confidence: 82%

Nonlinear excitation of polariton cavity modes in ZnO single nanocombs

Capeluto¹,

Grinblat²,

Tirado³

et al. 2014

Opt. Express

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Tunable second harmonic (SH) polaritons have been efficiently generated in ZnO nanocombs, when the material is excited close to half of the band-gap. The nonlinear signal couples to the nanocavity modes, and, as a result, Fabry-Pérot resonances with high Q factors of about 500 are detected. Due to the low effective volume of the confined modes, matterlight interaction is very much enhanced. This effect lowers the velocity of the SH polariton in the material by 50 times, and increases the SH confinement inside the nanocavity due to this higher refractive index. We also show that the SH phase-matching condition is achieved through LOphonon mediation. Finally, birrefringence of the crystal produces a strong SH intensity dependence on the input polarization, with a high polarization contrast, which could be used as a mechanism for light switching in the nanoscale.

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Section: Experimental Setup and Sample Growingsupporting

confidence: 82%

Nonlinear excitation of polariton cavity modes in ZnO single nanocombs

Capeluto¹,

Grinblat²,

Tirado³

et al. 2014

Opt. Express

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“…They are randomly oriented and composed of a $5 lm length, $140 nm width belt, from which about 10-80 nm diameter, $1 lm long NWs grew perpendicularly. As pointed out in previous reports, 11,12 these teeth are probably formed through a self-catalyzed vapor-solid process since they start from another ZnO NW.…”

mentioning

confidence: 57%

Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence

Grinblat

Capeluto

Tirado

et al. 2012

Applied Physics Letters

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ZnO nanowires were grown by vapor-transport and deposition on Au nanocluster covered fused and thermal silica and c-Si. The nanowire size and density depended strongly on the substrate type. By decreasing the O2 to local Zn partial pressure ratio, the growth pattern changed to nanocombs and nanosheets. ZnO nanohedgehogs were found on bare c-Si. We observe a remarkable correlation between the defect to exciton photoluminescence intensity ratio and the nanostructures specific surface areas. These results indicate that changes in strain and O deficiency defects at surfaces are behind the observed morphology changes, one to two-dimensional growth transition, and corresponding luminescence.

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“…Different methods such as chemical vapor deposition [12,13], sol-gel process [14], direct current sputtering [15], radio frequency sputtering [16], and thermal-evaporation have been proposed to deposit ZnO films on a PS layer [17]. Despite various methods of preparing ZnO layers with a nanostructure, there is still the need to develop a low-cost, reproducible method for creating these layers.…”

Section: Introductionmentioning

confidence: 99%

Growth of Zinc Oxide Nanocombs on Porous Silicon Layer by Thermal-Evaporation Method

Salman¹

2015

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Zinc oxide (ZnO) film was deposited on a porous silicon (PS) layer prepared by electrochemical etching through the thermal-evaporation method. ZnO nanocombs structure arrays were directly fabricated on the PS substrate through zinc powder evaporation, which uses a simple thermal-evaporation method without a catalyst. The ZnO nanocombs were highly oriented along the c-axis perpendicular to the PS layer. The average crystallite size of the PS and the ZnO nanocombs were 17.06 and 17.94 nm, respectively. The photoluminescence emission spectra of the ZnO nanocombs grown on the PS layer showed three emission peaks. The two peaks located at 387.5 and 605 nm were caused by the ZnO nanocombs, whereas the third peak located at 637.5 nm was caused by the PS layer. The ZnO nanocombs grown on the PS layer exhibited exceptional light trapping at wavelengths ranging from 400 to 1000 nm, which was expected to increase the efficiency of nano-electronic and nano-optical devices such as (solar cells).

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The Synthesis and Optical Properties of ZnO Nanocombs

Cited by 8 publications

References 0 publications

Nonlinear excitation of polariton cavity modes in ZnO single nanocombs

Nonlinear excitation of polariton cavity modes in ZnO single nanocombs

Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence

Growth of Zinc Oxide Nanocombs on Porous Silicon Layer by Thermal-Evaporation Method

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