Next Article in Journal
An Organophosphorus(III)-Selective Chemodosimeter for the Ratiometric Electrochemical Detection of Phosphines
Previous Article in Journal
Surface Functionalization of Cotton Fabric with Fluorescent Dendrimers, Spectral Characterization, Cytotoxicity, Antimicrobial and Antitumor Activity
Previous Article in Special Issue
Porous Gig-Lox TiO2 Doped with N2 at Room Temperature for P-Type Response to Ethanol
Article Menu

Article Versions

Export Article

Open AccessArticle
Chemosensors 2019, 7(2), 18; https://doi.org/10.3390/chemosensors7020018

Improved Synthesis of ZnO Nanowalls: Effects of Chemical Bath Deposition Time and Annealing Temperature

1
Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università Degli Studi di Catania, via S. Sofia 64, 95123 Catania, Italy
2
MATIS CNR-IMM, via S. Sofia 64, 95123 Catania, Italy
3
BRIT (Bio-nanotechResearchInnovationTower), Università degli Studi di Catania, via S. Sofia 89, 95123 Catania, Italy
*
Author to whom correspondence should be addressed.
Received: 18 February 2019 / Revised: 26 March 2019 / Accepted: 27 March 2019 / Published: 1 April 2019
(This article belongs to the Special Issue Nanotechnology Efforts for Chemical Sensors)
PDF [510 KB, uploaded 1 April 2019]

Abstract

Zinc Oxide (ZnO) nanowalls (NWLs) are interesting nanostructures for sensing application. In order to push towards the realization of room-temperature operating sensors, a detailed investigation of the synthesis effect on the electrical and optical properties is needed. This work focuses on the low-cost synthesis of ZnO NWLs by means of chemical bath deposition (growth time of 5, 60, and 120 minutes) followed by annealing in inert ambient (temperature of 100, 200, and 300 °C). The as-grown NWLs show a typical intertwined network of vertical sheets whose features (thickness and height) stabilize after 60 minutes growth. During thermal annealing, NWLs are converted into ZnO. The electric transport across the ZnO NWL network radically changes after annealing. A higher resistivity was observed for longer deposition times and for higher annealing temperatures, at which the photoluminescence spectra resemble those obtained for ZnO material. A longer deposition time allows for a better transformation to ZnO during the annealing, thanks to the presence of ZnO seeds just after the growth. These findings can have a significant role in promoting the realization of room-temperature operating sensors based on ZnO NWLs.
Keywords: ZnO; nanowalls; morphological aspects; electrical properties; optical properties ZnO; nanowalls; morphological aspects; electrical properties; optical properties
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Pellegrino, D.; Franzò, G.; Strano, V.; Mirabella, S.; Bruno, E. Improved Synthesis of ZnO Nanowalls: Effects of Chemical Bath Deposition Time and Annealing Temperature. Chemosensors 2019, 7, 18.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Chemosensors EISSN 2227-9040 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top