Optical and structural properties of porous zinc oxide fabricated via electrochemical etching method

Ching, C. G.; Lee, S.C.; Ooi, P. K.; Ng, Sha Shiong; Hassan, Z.; Hassan, H. Abu; Abdullah, M.J.

doi:10.1016/j.mseb.2013.05.002

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…However, the techniques used for the synthesis of hybrid materials are expensive. Other researchers have developed less expensive techniques such as the electrochemical method [27], spray pyrolysis [28] and sol-gel process [29]. Recently, Kesraoui et al (2018) reported that the precipitation method can be a simple and cheap method used for the synthesis of hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Textile Wastewater Purification Using an Elaborated Biosorbent Hybrid Material (Luffa–Cylindrica–Zinc Oxide) Assisted by Alternating Current

Othmani

Kesraoui

Boada

et al. 2019

Water

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This paper aims to synthesize hybrid materials with high pollutant-uptake capacity and low costbased based on Luffa cylindrica (L.C) and different percentage of Zn2+ in the presence and absence of alternating current (AC). Physico-chemical, morphological and structural characterizations of the hybrid materials were performed by Boehm method, point zero charge (pHpzc), infrared characterizations (IR), scanning electron microscopy (SEM), energy–dispersive spectroscopyand and X-ray photoelectron spectroscopy. The efficiency of the designed hybrid materials was optimized based on their performance in water depollution. Methylene blue (MB) and industrial textile wastewater were the investigated pollutants models. IR characterizations confirmed the fixation of Zn2+ onto the L.C by the creation of Zn-OH, Zn-O and Zn-O-C bonds. Boehm titration showed that the fixation of Zn2+ onto L.C is accompanied by an increase of the basic functions of its surface and subsequently an increase in the pHpzc. SEM results confirmed the fixation of Zn2+ onto the L.C coupling AC with biosorption showed an increase in the adsorbed amount of MB and speed when adding the 4% of Zn2+ compared to the pure L.C the Qm shifted from 3.22 to 9.84 and 8.81 mg/g, respectively, for hybrid materials synthesized under AC, in absence of AC and pure L.C.

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Section: Introductionmentioning

confidence: 99%

Textile Wastewater Purification Using an Elaborated Biosorbent Hybrid Material (Luffa–Cylindrica–Zinc Oxide) Assisted by Alternating Current

Othmani

Kesraoui

Boada

et al. 2019

Water

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“…This anisotropic effect can be modulated by the use of various etching method, agent and conditions. For instance, a dominant vertical etching process has been obtained on rf-sputtered ZnO film etched electrochemically using 10 wt% KOH solution [34,35]. In this work, post-chemical etching was then performed in a second step in order to enlarge the inter-grain space and increase the accessibility of the thin film surface area.…”

Section: Hcl-etched Zno Thin Filmsmentioning

confidence: 99%

Detailed microstructure analysis of as-deposited and etched porous ZnO films

Shang

Thimont

Barnabé

et al. 2015

Applied Surface Science

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ZnO nanostructured materials in thin film forms are of particular interest for photovoltaic or photocatalysis processes but they suffer from a lack of simple methods for optimizing their microstructure. We have demonstrated that microporous ZnO thin films with optimized inter grain accessibility can be produce by radio frequency magnetron sputtering process and chemical etching with 2.75 mM HCl solution for different duration. The as-deposited ZnO thin films were first characterized in terms of structure, grain size, inter grain space, open cavity depth and total thickness of the film by XRD, AFM, SEM, profilometry and optical measurements. A specific attention was dedicated to the determination of the surface enhancement factor (SEF) by using basic geometrical considerations and images treatments. In addition, the porous fraction and its distribution in the thickness have been estimated thanks to the optical simulation of the experimental UV-Visible-IR spectrums using the Bruggeman dielectric model and cross section SEM images analysis respectively. This study showed that the microstructure of the as-deposited films consists of a dense layer covered by a porous upper layer developing a SEF of 12-13 m 2 m −2. This two layers architecture is not modified by the etching process. The etching process only affects the upper porous layer in which the overall porosity and the inter-grain space increase with the etching duration. Column diameter and total film thickness decrease at the same time when the films are soaked in the HCl bath. The microporous structure obtained after the etching process could generate a great interest for the interfaces electronic exchanges for solar cells, photocatalysis and gas sensors applications.

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“…The aim of this research is to determine the best conditions for wet etching of ZnO according to different concentrations and etching times. Numerous studies have been conducted on several kinds of surfaces, etching methods, and ZnO growth parameters [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The effects of etching time and hydrogen peroxide concentration on the ZnO/glass substrate

Alias¹,

Yusoff²,

Yahya³

2023

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The purpose of the study is to determine the best technique for etching ZnO thin films. ZnO is deposited on the glass substrate using a radio frequency sputtering equipment. To etch the ZnO thin film, hydrogen peroxide (H2O2) concentrations of 10%, 20%, and 30% are utilised, with etching times of 30 and 60 seconds. The optical band gap is lowered after a specific quantity of etching, which shows that the film's crystallinity quality has improved. The impact of various ZnO thicknesses on the sample's optical properties is investigated using OPAL 2 simulator. In comparison to other ZnO layers of varied thickness, the OPAL 2 simulation shows that the 400 nm ZnO layer has the lowest transmission in the UV wavelength range.

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Optical and structural properties of porous zinc oxide fabricated via electrochemical etching method

Cited by 6 publications

References 21 publications

Textile Wastewater Purification Using an Elaborated Biosorbent Hybrid Material (Luffa–Cylindrica–Zinc Oxide) Assisted by Alternating Current

Textile Wastewater Purification Using an Elaborated Biosorbent Hybrid Material (Luffa–Cylindrica–Zinc Oxide) Assisted by Alternating Current

Detailed microstructure analysis of as-deposited and etched porous ZnO films

The effects of etching time and hydrogen peroxide concentration on the ZnO/glass substrate

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