Growth mechanism and photoluminescence property of hydrothermal oriented ZnO nanostructures evolving from nanorods to nanoplates

Liu, Yuanyuan; Zhang, Zhiyong; Yan, Junfeng; Zhao, Wenguang; Zhai, Chunxue; Liu, Jin

doi:10.1016/j.jallcom.2017.05.075

Cited by 57 publications

(24 citation statements)

References 44 publications

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“…The intensities of these two visible emission peaks (I Vis ) are both quite low compared to the intensity of UV emission peak (I UV ) as shown in PL spectra. The value of I UV / I Vis is an important factor to compare the optical properties of materials . For our samples synthesized in solution, the high ratio of I UV / I Vis probably suggests their high crystal quality with low intrinsic and interface defects.…”

Section: Resultsmentioning

confidence: 94%

One‐Step Low‐Temperature Synthesis of Syringe‐Shaped ZnO Nanorod Arrays, Growth Mechanism and Optical Properties

Huang

et al. 2018

Crystal Research and Technology

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The syringe-shaped ZnO nanorod arrays (ZNAs) are synthesized by one-step aqueous solution method. The SiN x /Si substrate with this structure exhibits rather lower surface reflectance over a wide range of wavelengths than the samples without it or with round top ZNAs. The theoretical reflectance simulated by three-dimensional finite-difference time-domain method also reveals that the ZnO nanorods with ultrasharp tips can effectively suppress the surface reflectance, which attributes to the effective refractive index gradual increasing from air to the bottom of syringe-shaped ZNAs. Also, from the room-temperature PL spectra, the UV emission peak is found at around 380 nm, and the intensity is much higher than other two broad visible peaks (at around 460 nm and 540 nm respectively), indicating ZNAs synthesized in solution have high crystal quality. Furthermore, the possible growth mechanism of syringe-shaped ZNAs is proposed.

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Section: Resultsmentioning

confidence: 94%

One‐Step Low‐Temperature Synthesis of Syringe‐Shaped ZnO Nanorod Arrays, Growth Mechanism and Optical Properties

Huang

et al. 2018

Crystal Research and Technology

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“…On taking a closer look at the peak‐to‐peak ratios between the E 2 (high) and E 1 (LO) modes for the plasma‐treated ZnO network, a clear difference in the intensity can be observed when compared to the peaks of the untreated T‐ZnO. The E 2 (high) mode has been assigned to the vibrations originating from the oxygen sub‐lattice, its high intensity ensuring the high crystallinity of the wurtzite ZnO . The intensity reduction, on the other hand, might indicate disruptions/distortions in the crystal structure of the ZnO.…”

Section: Resultsmentioning

confidence: 99%

Surface modification of highly porous 3D networks via atmospheric plasma treatment

Smazna

Shree

Hoppe

et al. 2018

Contributions to Plasma Physics

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Tetrapodal ZnO (T‐ZnO) and aerographite networks represent two highly open porous (94.6 and 99.96%, respectively) model materials on which the impact of an atmospheric‐pressure plasma was studied for the first time. The air plasma treatment by a surface barrier discharge caused remarkable surface modifications on the T‐ZnO template, leading to a large number of oxygen vacancies. These observations were made using scanning electron microscopy (SEM) and Raman spectroscopy. In the second proposed set‐up, pellets of aerographite material were processed to a plasma jet with pressurized air and nitrogen. Hexamethyldisiloxane (HMDSO) was introduced as a precursor into the effluent jet for nanoparticle deposition. Opposing trends in atomic concentrations versus distance to the plasma source were observed when the gas (nitrogen or pressurized air) was changed. More pronounced nanoparticle coverage occurred in the pressurized air plasma. Their distribution was studied using SEM, energy‐dispersive X‐ray (EDX), and Raman spectroscopy. Because of the higher oxidation in the pressurized air plasma treatment, the deposited nanostructures appeared to be a mixture of Si and SiOx nanoparticles.

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“…A Figura 4 mostra os espectros do óxido de zinco e óxido dopado com bismuto em diferentes teores. A alta concentração de defeitos intrínsecos e impurezas produz bandas alargadas, e o aumento destes defeitos e impurezas, aumenta a intensidade [28,[30][31][32]. Este aumento pode ser visto nos espectros, conforme aumenta a dopagem de bismuto, aumenta a intensidade.…”

Section: Resultados E Discussõesunclassified

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

2018

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____________________________________________________________________________________________________________ RESUMOO óxido de zinco devido à presença de defeitos intrínsecos possibilita a dopagem com outros materiais, como o bismuto. O BZO (óxido de zinco dopado com bismuto) preparado via síntese hidrotermal assistida por microondas (MAHS) foi estudado por sua concentração de dopante e caracterização morfológica. Os produtos foram caracterizados DRX, MEV e PL; Cálculos de banda gap por espectroscopia de transmissão. Os resultados indicam que as nanoestruturas de BZO foram obtidas com tamanhos de cristalitos variando de 5,82 a 8,37 nm. A mesma estrutura morfológica, tipo flor, foi formada com diferentes concentrações de dopantes. PL demonstra que os defeitos aumentam com a dopagem do bismuto. O intervalo de band gap encontrado foi de 2,79-3,3 eV e tem potencial uso em aplicações de fotodegradação.

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Growth mechanism and photoluminescence property of hydrothermal oriented ZnO nanostructures evolving from nanorods to nanoplates

Cited by 57 publications

References 44 publications

One‐Step Low‐Temperature Synthesis of Syringe‐Shaped ZnO Nanorod Arrays, Growth Mechanism and Optical Properties

One‐Step Low‐Temperature Synthesis of Syringe‐Shaped ZnO Nanorod Arrays, Growth Mechanism and Optical Properties

Surface modification of highly porous 3D networks via atmospheric plasma treatment

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

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