Journal ArticleDOI
The mechanism for hydrothermal growth of zinc oxide
TLDR
In this paper, the mechanism for the growth of ZnO was studied in ammonium hydroxide solution at pH near 11 (0.3 M NH4OH), and the products formed at 20-90 °C and ambient pressure were characterised using Fourier Transform Infrared Spectrograph (FTIR), X-ray Photon Spectroscopy (XPS), XRD and secondary ion mass spectroscopy(SIMS).Abstract:
The mechanism for hydrothermal growth of ZnO was studied in ammonium hydroxide solution at pH near 11 (0.3 M NH4OH). The products formed at 20–90 °C and ambient pressure were characterised using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photon Spectroscopy (XPS), X-ray Diffraction (XRD) and Secondary Ion Mass Spectroscopy (SIMS). Under these conditions, the growth of ZnO occurs via the initial precipitation of e-Zn(OH)2 (Wulfingite), which subsequently dehydrates, to form Wurtzite ZnO. Isotope tracking experiments show that most of the oxygen atoms do not mix with water during the conversion from Wulfingite to ZnO, and thus that the reaction proceeds primarily in the solid phase rather than through dissolution then reprecipitation. XPS results show that the surface of hydrothermal ZnO consists primarily of zinc hydroxide at lower temperatures, and there is a significant fraction of zinc hydroxide persisting at higher temperatures. Together these results show that much of the solid-solution interface is mainly comprised of zinc hydroxide not ZnO. These findings may have implications for understanding how small organic molecules can be used to control the morphology of zinc oxide crystals grown under hydrothermal conditions.read more
Citations
More filters
Journal ArticleDOI
Dissolvable Metals for Transient Electronics
Lan Yin,Huanyu Cheng,Shimin Mao,Richard T. Haasch,Yuhao Liu,Xu Xie,Suk Won Hwang,Harshvardhan Jain,Seung-Kyun Kang,Yewang Su,Rui Li,Yonggang Huang,John A. Rogers +12 more
TL;DR: In this article, the potential for use of these metals in water-soluble, physically "transient" electronics is evaluated. But the results indicate that the electrical dissolution rates in thin films can be much different that traditionally reported corrosion rates in corresponding bulk materials.
PatentDOI
Biodegradable materials for multilayer transient printed circuit boards
John A. Rogers,Xian Huang +1 more
TL;DR: Biodegradable printed circuit boards based on water-soluble materials can dissolve in water within 10 mins to yield end-products that are environmentally safe and have the potential to reduce hazardous waste streams associated with electronics disposal.
Journal ArticleDOI
Zinc oxide light-emitting diodes: a review
TL;DR: A survey of the various material schemes and device structures that have been explored in the quest toward developing light-emitting diodes (LEDs) based on zinc oxide (ZnO) and related II-oxide semiconductors can be found in this paper.
Journal ArticleDOI
Chemistry of Ammonothermal Synthesis
TL;DR: Ammonothermal synthesis is a method for synthesis and crystal growth suitable for a large range of chemically different materials, such as nitrides, amides, and polychalcogenides as mentioned in this paper.
Journal ArticleDOI
Characterization and photocatalytic performance of ternary Cu-doped ZnO/Graphene materials
Shu Han Hsieh,Jyh-Ming Ting +1 more
TL;DR: In this article, a ternary nanocomposite photocatalyst consisting of Cu-doped ZnO and reduced graphene oxide (RGO) was synthesized using a facile one-step microwave-assisted hydrothermal method.
References
More filters
Journal ArticleDOI
VESTA: a three-dimensional visualization system for electronic and structural analysis
Koichi Momma,Fujio Izumi +1 more
TL;DR: VESTA as mentioned in this paper is a cross-platform program for visualizing both structural and volumetric data in multiple windows with tabs, including isosurfaces, bird's-eye views and two-dimensional maps.
Journal ArticleDOI
Growth of Arrayed Nanorods and Nanowires of ZnO from Aqueous Solutions
TL;DR: In this article, a template-less and surfactant-free aqueous method is proposed to generate metal oxide thin films with controlled complexity. But the synthesis involves a templateless and a surfactent-free approach, which enables the generation of, at large-scale, low-cost, and moderate temperatures, advanced metal oxide particle-to-particle thin films.
Journal ArticleDOI
Direct-current nanogenerator driven by ultrasonic waves
TL;DR: A nanowire nanogenerator that is driven by an ultrasonic wave to produce continuous direct-current output and offers a potential solution for powering nanodevices and nanosystems.
Journal ArticleDOI
Growth mechanism and growth habit of oxide crystals
TL;DR: In this article, the growth mechanism and growth habit of oxide crystals are investigated from a kinetics viewpoint, starting from the hypothesis of growth unit, and a new rule concerning the growth habit is deduced considering the relation between the growth rate and the orientation of the coordination polyhedron at the interface.
Journal ArticleDOI
Growth conditions for wurtzite zinc oxide films in aqueous solutions
Satoshi Yamabi,Hiroaki Imai +1 more
TL;DR: A pH above 9.0 was essential for the formation of wurtzite zinc oxide (ZnO) in aqueous solution systems as discussed by the authors, and the addition of complexing agents to decrease the deposition rate was required for the direct growth of ZnO on the surface of substrates through heterogeneous nucleation.