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691973.pdf (8.38 MB)

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2019-04-06

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cc-by-nc-nd (c) Elsevier, 2019
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/142071

Role of aluminum and HMTA in the hydrothermal synthesis of two-dimensional n-doped ZnO nanosheets

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https://doi.org/10.1016/j.nanoen.2019.04.017

Resum

This work reports the study of the processes behind the growth of two-dimensional (2D) n-doped ZnO nanostructures on an AlN layer. We have demonstrated that AlN undergoes a slow dissociation process due to the basic controlled environment promoted by the hexamethylenetetramine (HMTA). The Al(OH)4- ions created inhibits the growth along the c-axis, effectively promoting the fast formation of a planar geometry selectively grown on top of the AlN layer. With the use of this promoting layer and a standard hydrothermal method, a selective area growth is observed with micrometric resolution. In addition, by using several advanced characterization techniques such as, X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS/EDX), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL), we observed a resulting doping with aluminum of the ZnO nanostructures, occupying substitutional and interstitial sites, that could lead to new promising applications. These high-quality n-doped ZnO nanosheets (NSs) exhibit strong ultraviolet emission in the 385-405 nm region without broad deep level emission. The piezoelectric nature of these nanostructures has been demonstrated by using piezoresponse atomic force microscope (PFM) and with the support of a piezoelectric test device. Therefore, this low-cost and fast selective-area synthesis of 2D n-doped ZnO NSs can be applicable to other aluminum based materials and paves the way to new promising applications, such as bioelectronic applications, energy generation or self-powered sensing

Matèries

Alumini, Òxid de zinc, Nanocristalls

Matèries (anglès)

Aluminum, Zinc oxide, Nanocrystals

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Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

Citació

MURILLO, Gonzalo, LEÓN-SALGUERO, Edgardo, MARTÍNEZ-ALANIS, Paulina r., ESTEVE TINTÓ, Jaume, ALVARADO-RIVERA, Josefina, GÜELL VILÀ, Frank. Role of aluminum and HMTA in the hydrothermal synthesis of two-dimensional n-doped ZnO nanosheets. _Nano Energy_. 2019. Vol. 60, núm. 817-826. [consulta: 7 de gener de 2026]. ISSN: 2211-2855. [Disponible a: https://hdl.handle.net/2445/142071]

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