Synthesis and stress relaxation of ZnO/Al-doped ZnO core–shell nanowires

Hong-bo, Wang; Ma, Fei; Li, Qianqian; Dong, Cezhou; Ma, Dengke; Wang, Hong-Tao; Xu, Ke

doi:10.1039/c3nr33584d

Cited by 26 publications

(24 citation statements)

References 33 publications

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“…With the aim of discerning the structural origin of the observed results different possibilities were explored, i.e. that dopant Al ions diffuse into the ZnO matrix and occupy substitutional locations (Wang et al, 2013), or the formation of an interface between a ZnO nanowire core and an Al 2 O 3 shell. The results of the calculations (not shown) clearly indicate that Al does not enter the ZnO matrix.…”

Section: Figure 16mentioning

confidence: 99%

EXAFS and XANES analysis of oxides at the nanoscale

Kuzmin

Chaboy

2014

IUCrJ

215

202

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Worldwide research activity at the nanoscale is triggering the appearance of new, and frequently surprising, materials properties in which the increasing importance of surface and interface effects plays a fundamental role. This opens further possibilities in the development of new multifunctional materials with tuned physical properties that do not arise together at the bulk scale. Unfortunately, the standard methods currently available for solving the atomic structure of bulk crystals fail for nanomaterials due to nanoscale effects (very small crystallite sizes, large surface-to-volume ratio, near-surface relaxation, local lattice distortions etc.). As a consequence, a critical reexamination of the available local-structure characterization methods is needed. This work discusses the real possibilities and limits of X-ray absorption spectroscopy (XAS) analysis at the nanoscale. To this end, the present state of the art for the interpretation of extended X-ray absorption fine structure (EXAFS) is described, including an advanced approach based on the use of classical molecular dynamics and its application to nickel oxide nanoparticles. The limits and possibilities of X-ray absorption near-edge spectroscopy (XANES) to determine several effects associated with the nanocrystalline nature of materials are discussed in connection with the development of ZnO-based dilute magnetic semiconductors (DMSs) and iron oxide nanoparticles.

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Section: Figure 16mentioning

confidence: 99%

EXAFS and XANES analysis of oxides at the nanoscale

Kuzmin

Chaboy

2014

IUCrJ

215

202

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“…on ZnO usually leads to an increase of UV emission and decrement of green emission. 12,14 Whereas in cases of small work function metal (Ti, Zn, Al, Ni, Ag, etc.) decoration, the UV and green emissions were both enhanced due to the ohmic contact at interface.…”

mentioning

confidence: 98%

“…11 Among them, metal nanoparticles (NPs), which exhibit surface plasmon resonance (SPR) features, have generated a considerable amount of interests over years. Enhanced NBE emissions have been achieved by incorporating various metal NPs such as Au, 12 Ag, 13 Al, 14 and Pt. 15 The mechanism is generally interpreted as the coupling between the SPR of the metal NPs and the transition of charge transfer through the metal/ZnO interfaces.…”

mentioning

confidence: 99%

The surface-plasmon-resonance and band bending effects on the photoluminescence enhancement of Ag-decorated ZnO nanorods

Qin

Xie

et al. 2014

Journal of Applied Physics

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Doping with noble metal nanoparticles (NPs) is an effective method to tune the photoluminescence (PL) properties of semiconductor materials. The mechanism is widely attributed to the localized surface-plasmon-resonance (SPR) effect of the metal NPs, while the contribution of potential barrier at the interface between metal and semiconductor is less discussed. Taking ZnO nanorods on fused silica substrates as a model system, we present a facile low-temperature fabrication method to derive Ag metal NPs coated ZnO nanorods. Great enhancement of the near-band-edge (NBE) ultraviolet emission of the ZnO nanorods was achieved by the surface decoration with Ag NPs, accompanied with a decrement of deep-level (DL) emission intensity. Since, the Ag NPs are active even at ambient conditions, spontaneous changes in PL properties have been observed with aging time. The influence of oxidation state of Ag on the contacting potential and subsequently on the PL properties of ZnO nanorods were studied by employing a subsequent thermal annealing process. The role of contacting behavior and the varied potential barrier are comprehensively discussed. It was demonstrated that both the SPR effect and band bending effect can enhance the NBE emission and suppress the DL emission. In the Ag-decorated ZnO nanorods, the SPR effect is the main reason for PL enhancement of the metallic silver, while the potential barrier enhancement is the main reason for the oxidized silver.

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“…We suppose such extended spots parallel to the axial direction caused by presence of axial defects. [28] According to literature, the lattice spacing for d = 0.316 and 0.638 nm are supposed to be graphite (0002) and (0001), respectively. We compared the lattice spacing d = 0.363 nm from previous report that the lattice constant is very similar with nano-crystal diamond (d ≈ 0.358 nm) [29].…”

Section: Cross-sectional Analysis For Periodic Structurementioning

confidence: 99%

Nano Periodic Structure Formation in 4H–SiC Crystal Using Femtosecond Laser Double-Pulses

Kim

Shimotsuma

Sakakura

et al. 2018

J. Superhard Mater.

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Nano periodic structure formation in 4H-SiC crystal using femtosecond laser double-pulses The photo-induced periodic nano structure inside 4H-SiC have been induced by a femtosecond double pulse train. The alignment of the periodic structure is in the direction independently from crystal orientation. In particular, FE-SEM analysis revealed that the periodic structure on the fractured surface can be classified into two categories of the polarization-dependent and polarization-independent.

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Synthesis and stress relaxation of ZnO/Al-doped ZnO core–shell nanowires

Cited by 26 publications

References 33 publications

EXAFS and XANES analysis of oxides at the nanoscale

EXAFS and XANES analysis of oxides at the nanoscale

The surface-plasmon-resonance and band bending effects on the photoluminescence enhancement of Ag-decorated ZnO nanorods

Nano Periodic Structure Formation in 4H–SiC Crystal Using Femtosecond Laser Double-Pulses

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