Direct in situ observation of ZnO nucleation and growth via transmission X-ray microscopy

Tay, Stephen En Rong; Goode, Angela E.; Weker, Johanna Nelson; Cruickshank, Amy; Heutz, Sandrine; Porter, Alexandra E.; Ryan, Mary P.; Toney, Michael F.

doi:10.1039/c5nr07019h

Cited by 14 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several publications have discussed the process of nucleation and growth of ZnO NRs. [ 32,33 ] Based on these experimental results, the process of the electrolytic chemical synthesis of zinc oxide NRs from the nitrate precursor is explained as follows [ 31 ]

Zn {({NO}_{3})}_{2} \to {Zn}^{2 +} + 2 {NO}_{3}^{-}

{NO}_{3}^{-} + {normalH}_{2} O + 2 {normale}^{-} ⇌ {NO}_{2}^{-} + 2 {OH}^{-}

{Zn}^{2 +} + 2 {OH}^{-} \to Zn {(OH)}_{2}

Zn {(OH)}_{2} \to ZnO + {normalH}_{2} O

…”

Section: Resultsmentioning

confidence: 99%

Electrodeposited ZnO Nanorods as Efficient Photoanodes for the Degradation of Rhodamine B

Hssi

Amaterz

Labchir

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein the synthesis of ZnO nanorods (NRs) by means of the one‐ and two‐step electrochemical deposition (ECD) process is focused upon. A comparison of the crystal structure, morphology, optical properties, and photoelectrocatalytic (PEC) activities of nanostructured ZnO cultivated by the two methods is conducted. X‐ray diffraction (XRD) analysis reveals that all samples annealed at 300 °C are polycrystalline and have a hexagonal (wurtzite) structure and significant improvement in the crystallinity of the sample deposited by the two‐step process. The morphological characterizations show that the NRs are well hexagonal and well oriented in the same sample. The optical spectra show a transmittance higher than 70% and direct bandgaps of 3.12 and 3.04 eV for the samples synthesized by one‐step and two‐step electrodeposition, respectively. The PEC properties of the films obtained are studied and reveal an efficient and rapid rhodamine B (RhB) azo dye degradation. In addition, the scavengers of reactive species as well as the kinetics during degradation are also studied and show that the superoxide radicals contribute significantly in degradation.

show abstract

Zn {({NO}_{3})}_{2} \to {Zn}^{2 +} + 2 {NO}_{3}^{-}

{NO}_{3}^{-} + {normalH}_{2} O + 2 {normale}^{-} ⇌ {NO}_{2}^{-} + 2 {OH}^{-}

{Zn}^{2 +} + 2 {OH}^{-} \to Zn {(OH)}_{2}

Zn {(OH)}_{2} \to ZnO + {normalH}_{2} O

…”

Section: Resultsmentioning

confidence: 99%

Electrodeposited ZnO Nanorods as Efficient Photoanodes for the Degradation of Rhodamine B

Hssi

Amaterz

Labchir

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…CoCrMo particles were imaged in situ using a 3D printed electrochemical cell (details previously reported in ref. 27 ). To capture the onset of morphological changes, TXM images were collected as the potential was scanned from 0 to 0.7 V (at 0.5 mV/s).…”

Section: In Situ Spectroscopy At Diamond Beamline I20mentioning

confidence: 99%

Understanding the reactivity of CoCrMo-implant wear particles

et al. 2018

View full text Add to dashboard Cite

CoCrMo-based metal-on-metal hip implants experienced unexpectedly high failure rates despite the high wear and corrosion resistance of the bulk material. Although they exhibit a lower volumetric wear compared to other implant materials, CoCrMo-based implants produced a significantly larger 'number' of smaller wear particles. CoCrMo is nominally an extremely stable material with high Cr content providing passivity. However, despite the Co:Cr ratio in the original alloy being 2:1; chemical analyses of wear particles from periprosthetic tissue have found the particles to be composed predominately of Cr species, with only trace amounts of Co remaining. Here a correlative spectroscopy and microscopy approach has shown that these particles dissolve via a nonstoichiometric, and geometrically inhomogeneous, mechanism similar to de-alloying. This mechanism is previously unreported for this material and was not apparent in any of the regulatory required tests, suggesting that such tests are insufficiently discriminating.

show abstract

“…23 Transmission X-ray microscopy has been used to detect ZnO nucleation and growth. 24 In transmission electron microscopy, cation exchange could be observed in situ. 25 Raman spectroscopy as a simple, lab-based, nondestructive technique has been widely used to probe the physical state, phonon confinement, and crystal structure of ZnO.…”

Section: Introductionmentioning

confidence: 99%

Gradient in defect density of ZnO nanorods grown by cathodic delamination, a corrosion process, leads to end-specific luminescence

2018

View full text Add to dashboard Cite

ZnO nanorods were grown on a zinc substrate via cathodic delamination of a polymer coating, a tailored corrosion process, at room temperature. A comparison between in situ Raman spectra and post mortem cross sectional analysis by Raman spectroscopy, photoluminescence spectroscopy and scanning electron microscopy shows that in the initial stages of the synthesis, preferentially defect rich ZnO grows. At later stages, crystalline wurtzite ZnO growth dominates. The result is nanorod arrays consisting of nanorods with a large density of point defects in the approximate to 500 nmrange near the zinc substrate, and low defect density in the regions further away from the interface. The growth, which proceeds over several hours, can be interrupted at any time. Large salt concentrations in the corrosive medium increase the growth rate, but also the amount of point defects. The resulting rods show strongly position-dependent luminescence and Raman spectra. Different luminescence can thus be selectively excited, based on the position of excitation

show abstract

Direct in situ observation of ZnO nucleation and growth via transmission X-ray microscopy

Cited by 14 publications

References 20 publications

Electrodeposited ZnO Nanorods as Efficient Photoanodes for the Degradation of Rhodamine B

Electrodeposited ZnO Nanorods as Efficient Photoanodes for the Degradation of Rhodamine B

Understanding the reactivity of CoCrMo-implant wear particles

Gradient in defect density of ZnO nanorods grown by cathodic delamination, a corrosion process, leads to end-specific luminescence

Contact Info

Product

Resources

About