Synthesis and characterization of amorphous SiO2 nanowires directly grown on Cu substrates
- 146 Downloads
A novel procedure for the growth of Silica nanowires directly from Cu substrates is reported. The single-step synthesis procedure consists of a thermal treatment at 900 °C in Ar-H2 atmosphere, without the need for additional catalysts. Nanowires grow from Cu protrusions generated on the surface during annealing via Vapor–Liquid–Solid method, giving rise to a branched structure. These SiO2 nanostructures present an amorphous structure as evidenced by transmission electron microscopy. Silica nanowires grown on Cu and Si substrates have been characterized by XPS. Additionally, room-temperature photoluminescence measurements show a blue-green emission peak at ca. 509 nm (2.44 eV) attributed to oxygen deficiencies in the structure. The success of this procedure allows for future possible incorporation of these nanowires in optoelectronic devices.
New procedure for the growth of silica nanowires (SiO2NWs) directly on Cu substrates, via a single-step thermal treatment process without the need for additional catalysts. The process follows a VLS mechanism where SiO acts as the gaseous precursor of both: the SiO2NWs grown on the top Si fragment and those grown on the Cu substrate, roots-like nanowires (SiO2NRs). This synthesis permits to preserve the PL properties of the SiO2NWs on conductive Cu substrates, which could be of paramount importance in the design and implementation of integrated electronics and devices. Open image in new window
KeywordsSilica nanowires Vapor–liquid–solid mechanism Photoluminescence Cu foil
A. Gomez-Martinez wishes to acknowledge the Spanish Ministry of Education and Science for a FPI fellowship at the Autonomous University of Madrid (UAM). Financial support from the Ministerio de Economía y Competitividad (MINECO) under contract ENE2014-57977-C2-1-R, from the U.S. Department of Energy, through the Massie Chair Project at Turabo University, and from the U.S. Department of Defense under Grant W911NF-14-1-0046 are gratefully acknowledged. The authors thank the technical assistance of I. Poveda from the “Servicio Interdepartamental de Investigacion (SIdI)” at UAM for SEM measurements, as well as D. Daly and EK. McCarthy for technical support at the CRANN Advanced Microscopy Laboratory, Dublin, Ireland.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
- 2.Wu W, Feng H, Rao H et al. (2014) Maximizing omnidirectional light harvesting in metal oxide hyperbranched array architectures. Nat Commun 5:3968Google Scholar
- 18.Gomez-Martinez A, Marquez F, Elizalde E, Morant C (2014) Microspheres for the growth of silicon nanowires via vapor-liquid-solid mechanism. J Nanomater. Article ID 362798, 8 pages, http://dx.doi.org/10.1155/2014/362798
- 20.Gomez-Martinez A, Márquez F, Morant C (2016) A new approach of the synthesis of SiO2 nanowires by using bulk copper foils as catalyst. Appl Surf Sci 387:1072–1079Google Scholar
- 23.Moulder JF, Stickle WF, Sobol PE, Bomben KD (1995) Handbook of X-ray photoelectron spectroscopy. Physical Electronics, Eden Prairie, MNGoogle Scholar