Sprayed ZnO thin films for gas sensing: effect of substrate temperature, molarity and precursor solution

Karthik, T. V. K.; Hernandez, A.G.; Kudriavtsev, Yu.; Gómez-Pozos, Heberto; Ramírez-Cruz, M. G.; Martínez-Ayala, Lizeth; Escobosa, A.

doi:10.1007/s10854-020-02987-7

Cited by 15 publications

(13 citation statements)

References 50 publications

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“…A wide variety of metal oxide sensing materials have been reported for their use in CO

detection. One such sensing material under this class is reported by Karthik et al, who developed a Zinc oxide (ZnO) sensing material, synthesized by the thermal decomposition of precursors such as zinc acetate and zinc nitrate [ 48 ]. Though active heating would be required to maintain an operating temperature of 300 °C, this material yields a wide CO

concentration range and a 50 ppm limit of detection.…”

Section: Sensing Materials For Target Analyte Detectionmentioning

confidence: 99%

A Review on Advanced Sensing Materials for Agricultural Gas Sensors

Love

Nazemi

El-Masri

et al. 2021

Sensors

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This work is a comprehensive review of sensing materials, which interact with several target gases pertinent to agricultural monitoring applications. Sensing materials which interact with carbon dioxide, water vapor (relative humidity), hydrogen sulfide, ethylene and ethanol are the focus of this work. Performance characteristics such as dynamic range, recovery time, operating temperature, long-term stability and method of deposition are discussed to determine the commercial viability of the sensing materials considered in this work. In addition to the sensing materials, deposition methods are considered to obtain the desired sensing material thickness based on the sensor’s mechanism of operation. Various material classes including metal oxides, conductive polymers and carbon allotropes are included in this review. By implementing multiple sensing materials to detect a single target analyte, the issue of selectivity due to cross sensitivity can be mitigated. For this reason, where possible, it is desirable to utilize more than one sensing material to monitor a single target gas. Among those considered in this work, it is observed that PEDOT PSS/graphene and TiO2-coated g-C3N4 NS are best suited for CO2 detection, given their wide dynamic range and modest operating temperature. To monitor the presence of ethylene, BMIM-NTf2, SWCNTs and PtTiO2 offer a dynamic range most suitable for the application and require no active heating. Due to the wide dynamic range offered by SiO2/Si nanowires, this material is best suited for the detection of ethanol; a gas artificially introduced to prolong the shelf life of the harvested crop. Finally, among all other sensing materials investigated, it observed that both SWCNTs and CNTs/SnO2/CuO are most suitable for H2S detection in the given application.

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“…A wide variety of metal oxide sensing materials have been reported for their use in CO

concentration range and a 50 ppm limit of detection.…”

Section: Sensing Materials For Target Analyte Detectionmentioning

confidence: 99%

A Review on Advanced Sensing Materials for Agricultural Gas Sensors

Love

Nazemi

El-Masri

et al. 2021

Sensors

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“…Posteriormente, los sustratos fueron colocados sobre estaño líquido contenido en la cámara de depósito del equipo de rocío químico (previamente reportado) a 260°C, con la finalidad de lograr un depósito homogéneo [13]. La solución precursora de ZnO fue diluyendo 0.2M de acetato de zinc dihidratato (Zn( 3) 2 2 2 ) en methanol ( 4 ) y manteniendo un tiempo de depósito durante 10 minutos en ambiente nitrógeno [5,14]. Finalmente, las muestras fueron sometidas a tratamiento térmico en aire a una temperatura de 400°C durante 30 minutos.…”

Section: Metodología Experimentalunclassified

“…El óxido de zinc (ZnO) es un material semiconductor del grupo II-VI con ancho de banda directa de 3.37 eV y una energía de excitón de 60 MeV [1]. Sus propiedades como transparencia óptica, comportamiento piezoeléctrico y polimorfismo lo han convertido en un buen candidato en aplicaciones como: celdas solares, ventanas ópticas de paneles solares, conductores transparentes, sensores de gas [2][3][4][5].…”

Section: Introductionunclassified

“…Se han reportado diferentes técnicas para la síntesis de ZnO, entre ellas destacan deposición química de vapor, deposición física de vapor, pulverización catódica, centrifugación sol-gel, rocío químico, entre otros [5][6][7][8][9]. La elección de una técnica económica, de fácil reproducibilidad y con la capacidad de obtener nanoestructuras es un parámetro importante en la síntesis de ZnO.…”

Section: Introductionunclassified

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Síntesis de nanohojuelas de ZnO mediante la técnica rocío químico por ultrasonicación

Martínez-Ayala

Ruíz

Garcı́a-Salgado

2021

ESTR

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En el presente trabajo reportamos la fabricación de nanohojuelas de óxido de zinc (ZnO) en sustratos de vidrio sintetizadas mediante la técnica rocío químico por ultrasonicación. La fabricación de nanohojuelas consistió en depositar ZnO a 260°C durante 10 minutos utilizando la técnica rocío químico por nebulización y su subsecuente tratamiento térmico a 400°C durante 30 minutos. Las propiedades ópticas, morfológicas y estructurales fueron analizadas mediante espectrometría UV-visible, microscopía electrónica de barrido (MEB) y difracción de rayos X (DRX). El estudio de las propiedades del ZnO depositado en vidrio corroboró la presencia y formación de nanohojuelas de ZnO homogéneamente interconectadas en tamaños de aproximadamente 35 nm (grosor) y 240-350 nm (longitud).

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“…It is one of the most relevant transparent conducting and multifunctional materials, with inherent physical characteristics including wide direct band gap (3.37 eV), high electron mobility and high energy of an excitonic nature [6]. Several methods are created to synthesize ZnO nanoparticles and thin films like: sol-gel [5], chemical bath deposition (CBD) [7], pulsed laser deposition(PLD) [8], and spray pyrolysis [9]. The spray pyrolysis technique has been commonly used to deposit almost all the semiconductor oxides, as a result of its cost-effectiveness and viability for mass production.…”

Section: Introductionmentioning

confidence: 99%

Impact of the meso-PSi substrate on ZnO thin films deposited by spray pyrolysis technique for UV photodetectors

et al. 2021

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ZnO thin films were successfully deposited via spray pyrolysis technique over various substrates, including glass, silicon, and mesoporous silicon (PSi). The effect of substrate type on the surface morphological, structural, and electrical properties of ZnO thin film was investigated. Scanning Electron Microscopy confirms the morphology of the meso-PSi substrate and displays the morphologies of the deposited ZnO. The (ZnO/PSi) heterojunction shows a porous ZnO layer with a large surface area by comparison to other structures. The patterns of X-ray Diffraction exposed that the deposited ZnO films have a hexagonal wurtzite polycrystalline structure. Ultraviolet (UV) metal-semiconductor-metal photodetectors have been investigated. The fabricated (ZnO/PSi) UV photodetector showed much higher photocurrent than other structures.

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Sprayed ZnO thin films for gas sensing: effect of substrate temperature, molarity and precursor solution

Cited by 15 publications

References 50 publications

A Review on Advanced Sensing Materials for Agricultural Gas Sensors

A Review on Advanced Sensing Materials for Agricultural Gas Sensors

Síntesis de nanohojuelas de ZnO mediante la técnica rocío químico por ultrasonicación

Impact of the meso-PSi substrate on ZnO thin films deposited by spray pyrolysis technique for UV photodetectors

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