Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires

Chong, Su Kong; Dee, Chang Fu; Rahman, Saadah Abdul

doi:10.1186/1556-276x-8-174

Cited by 20 publications

(10 citation statements)

References 55 publications

(80 reference statements)

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“…High-resolution transmission electron microscopy (HRTEM) micrographs of the samples were taken via a JEOL HRTEM (JEM-2100F), operating at an accelerating voltage of 200 kV. Characterization by X-ray diffraction and photoluminescence have been previously performed and published [ 17 , 18 ] (see Additional file 1 ). A preliminary PEC cell testing has been carried out to characterize the photocurrent.…”

Section: Methodsmentioning

confidence: 99%

Hierarchical Si/ZnO trunk-branch nanostructure for photocurrent enhancement

Dee¹,

Chong²,

Rahman³

et al. 2014

Nanoscale Res Lett

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Hierarchical Si/ZnO trunk-branch nanostructures (NSs) have been synthesized by hot wire assisted chemical vapor deposition method for trunk Si nanowires (NWs) on indium tin oxide (ITO) substrate and followed by the vapor transport condensation (VTC) method for zinc oxide (ZnO) nanorods (NRs) which was laterally grown from each Si nanowires (NWs). A spin coating method has been used for zinc oxide (ZnO) seeding. This method is better compared with other group where they used sputtering method for the same process. The sputtering method only results in the growth of ZnO NRs on top of the Si trunk. Our method shows improvement by having the growth evenly distributed on the lateral sides and caps of the Si trunks, resulting in pine-leave-like NSs. Field emission scanning electron microscope image shows the hierarchical nanostructures resembling the shape of the leaves of pine trees. Single crystalline structure for the ZnO branch grown laterally from the crystalline Si trunk has been identified by using a lattice-resolved transmission electron microscope. A preliminary photoelectrochemical (PEC) cell testing has been setup to characterize the photocurrent of sole array of ZnO NR growth by both hydrothermal-grown (HTG) method and VTC method on ITO substrates. VTC-grown ZnO NRs showed greater photocurrent effect due to its better structural properties. The measured photocurrent was also compared with the array of hierarchical Si/ZnO trunk-branch NSs. The cell with the array of Si/ZnO trunk-branch NSs revealed four-fold magnitude enhancement in photocurrent density compared with the sole array of ZnO NRs obtain from VTC processes.

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Section: Methodsmentioning

confidence: 99%

Hierarchical Si/ZnO trunk-branch nanostructure for photocurrent enhancement

Dee¹,

Chong²,

Rahman³

et al. 2014

Nanoscale Res Lett

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“…One of the main challenges is to avoid ZnO from forming an outer-shell layer on the Si NWs due to the more favored in planar growth rather than the c-axis growth on the Si NWs. 21 Metal catalyst, 22 photo-resist layer 14 and ZnO seeds layer 13 15 17 were independently used by researchers in order to direct the c-axis growth of ZnO NRs. ZnO seed layer is a better candidate as it avoids contamination due to the diffusion of catalyst or residual photo-resist compound.…”

Section: Articlementioning

confidence: 99%

Hierarchical-Oriented Si/ZnO Heterostructured Nanowires

Chong

Lim

Yap³

et al. 2014

sci adv mater

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In this work, self-catalytic growth of zinc oxide (ZnO) nanostructures on silicon nanowires (Si NWs) was studied using a vapor transport and condensation (VTC) method. ZnO seeded Si NWs were used as a base for the growth of ZnO nanostructure branches. We investigated the changes in morphologies of the ZnO nanostructures by varying the average size of the ZnO seeds and ZnO evaporation time. Our observations showed that the larger ZnO seeds are energetically more stable in promoting growth of ZnO nanorods (NRs) along the [0001] direction (c-axis). Increase in ZnO evaporation time lengthens the ZnO NRs, however, results in non-uniform diameter along the NRs due to irregular supply and precipitation of ZnO vapors on the non-polar surfaces of the NRs. The mechanisms of the seed size-dependent growth and time-dependent growth of ZnO nanostructures on Si NWs base were addressed. The hierarchical oriented Si/ZnO heterostructure NWs revealed interesting optical properties, among which, an enhancement in near band edge emission and suppression in optical reflection of the Si NWs.

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“…Because of their interesting properties for electronic and light emission devices applications, the ZnO structures constitute an interesting topic of research [1,2]. In particular, the Zinc Oxide (ZnO) nanostructures with different shapes, such as wires [3,4], spheres [5][6][7] and belts [8,9], are useful for applications in nanophotonics [10].…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Crystals with Controlled Size and Morphology

Debut

Fernandez-Morales

2016

Biol Med (Aligarh)

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Zinc Oxide (ZnO) has been synthesized by evaporation, condensation, and oxidation of metallic Zn under atmospheric pressure, the objective of this study is the growth the particles of ZnO and its relationship with the deposition zone. Pieces of Zn were introduced into a quartz tube acting as reactor which is placed inside the tubefurnace at 920-950°C under controlled pressure and heating profile. Carefully monitoring the temperature zones inside the reactor, ZnO crystals were growth. During heating, the oxygen in the surrounding environment reacted with the Zn pieces' surface to form a ZnO capsule with liquid and gaseous Zn inside. When the pressure inside the capsule surpasses the ambient pressure, cracks are formed in the oxide crust and the Zn vapor is released. Zinc in gaseous state oxidizes as it flows through air, and, depending on its trajectory, a variety of crystallites are obtained with size ranging from 20 nm, for the smallest particles, to 5 μm for the tetrapod nanostructures.

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Structural and photoluminescence studies on catalytic growth of silicon/zinc oxide heterostructure nanowires

Cited by 20 publications

References 55 publications

Hierarchical Si/ZnO trunk-branch nanostructure for photocurrent enhancement

Hierarchical Si/ZnO trunk-branch nanostructure for photocurrent enhancement

Hierarchical-Oriented Si/ZnO Heterostructured Nanowires

Zinc Oxide Crystals with Controlled Size and Morphology

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