CuO-Ga2O3 Thin Films as a Gas-Sensitive Material for Acetone Detection

Dyndał, Katarzyna; Zarzycki, A.; Andrysiewicz, Wojciech; Grochala, Dominik; Marszałek, К.; Rydosz, Artur

doi:10.3390/s20113142

Cited by 21 publications

(15 citation statements)

References 100 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main mechanism of gas detection is that potential barrier changes due to the interaction between the pre‐adsorbed O species and target gas molecules at the surface of the metal oxide. [ 36–40 ] First, when the CuO gas sensor is exposed to air at high temperatures, the O molecules in the air are being adsorbed at the surface, and their state is changed by electrons (Equations ()–()).

\begin{matrix} {normalO}_{2 (gas)} \to {normalO}_{2 (ads)} \end{matrix}

\begin{matrix} {normalO}_{2 (ads)} + {normale}^{-} \to {normalO}_{2 (ads)}^{-} \end{matrix}

\begin{matrix} {normalO}_{2 (ads)}^{-} + {normale}^{-} \to 2 {normalO}_{(ads)}^{-} \end{matrix}

\begin{matrix} {normalO}_{(ads)}^{-} + {normale}^{-} \to {normalO}_{(ads)}^{2 -} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Effect of Coordinatively Unsaturated Sites in MOF‐Derived Highly Porous CuO for Catalyst‐Free ppb‐Level Gas Sensors

Kim

Choi

Itoh

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Herein, the authors successfully synthesize diamond‐ and square‐type Cu‐metal–organic frameworks (MOFs) and then convert them to highly porous CuO nanostructures with maintaining their morphology. Both the CuO‐diamond (CuO‐D) and CuO‐square (CuO‐S) gas sensors can detect a tiny concentration of acetone gas up to 50 ppb. However, the gas sensitivity depends on the morphology and the CuO‐D exhibits a higher gas response (Rg/Ra: 3.3) for 1 ppm of acetone as compared with CuO‐S sensors (Rg/Ra: 2.5). The mainly exposed crystal facet on the surface significantly affects the sensor performance. Especially, coordinatively unsaturated metal sites in an exposed facet can allow enhancing the sensitivity. The (111) facet is the main exposed facet of CuO‐D and it includes Cu3‐fold which is a coordinatively unsaturated metal site. These relatively unstable Cu3‐fold sites are favorable to react with other molecules to stabilize themselves as compared with coordinatively saturated Cu4‐fold. Thus, CuO‐D demonstrates higher sensitivity as compared to CuO‐S, which is the main reaction surface as (020) facet composed only of Cu4‐fold.

show abstract

\begin{matrix} {normalO}_{2 (gas)} \to {normalO}_{2 (ads)} \end{matrix}

\begin{matrix} {normalO}_{2 (ads)} + {normale}^{-} \to {normalO}_{2 (ads)}^{-} \end{matrix}

\begin{matrix} {normalO}_{2 (ads)}^{-} + {normale}^{-} \to 2 {normalO}_{(ads)}^{-} \end{matrix}

\begin{matrix} {normalO}_{(ads)}^{-} + {normale}^{-} \to {normalO}_{(ads)}^{2 -} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Effect of Coordinatively Unsaturated Sites in MOF‐Derived Highly Porous CuO for Catalyst‐Free ppb‐Level Gas Sensors

Kim

Choi

Itoh

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Moreover, it can detect the acetone even at sub-ppm concentration (~0.2 ppm) and the sensor can operates at 90% humid condition, thus become an exceptional candidate in acetone quantitation. Apart from the aforementioned diverse nanostructures, nanocomposites that are not described under any unique nano-architectures also show their high selective sensitivity to acetone [148][149][150][151][152][153] as shown in Table 1. Wherein, a few of them operate at diverse humid conditions (10-90% RH) and some others require optimization of operating temperature to attain high sensitivity.…”

Section: Diverse Nanostructures In Acetone Detectionmentioning

confidence: 99%

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

Shellaiah

Sun

2021

Sensors

View full text Add to dashboard Cite

Environmental pollution related to volatile organic compounds (VOCs) has become a global issue which attracts intensive work towards their controlling and monitoring. To this direction various regulations and research towards VOCs detection have been laid down and conducted by many countries. Distinct devices are proposed to monitor the VOCs pollution. Among them, chemiresistor devices comprised of inorganic-semiconducting materials with diverse nanostructures are most attractive because they are cost-effective and eco-friendly. These diverse nanostructured materials-based devices are usually made up of nanoparticles, nanowires/rods, nanocrystals, nanotubes, nanocages, nanocubes, nanocomposites, etc. They can be employed in monitoring the VOCs present in the reliable sources. This review outlines the device-based VOC detection using diverse semiconducting-nanostructured materials and covers more than 340 references that have been published since 2016.

show abstract

“…The literature reports on chemiresistive oxygen concentration sensors based on undoped β-Ga 2 O 3 thin films operating at high temperature (1000 • C) [18,19] and, more recently, on β-Ga 2 O 3 thin films doped with Si, and Cr 2 O 3 operating at a medium temperature (400 • C) [20,21]. The conductivity of thin and thick films of gallium oxide increases in the presence of ethanol, methanol, carbon monoxide, acetone, hydrogen, hydrogen sulfide, and ammonia in the ambient atmosphere [22][23][24]. Moreover, β-Ga 2 O 3 thin films exhibit hydrophobic properties, which is why the humidity of the ambient atmosphere has little effect on their gas sensing properties, even at room temperature [24].…”

Section: Introductionmentioning

confidence: 99%

P-type Inversion at the Surface of β-Ga2O3 Epitaxial Layer Modified with Au Nanoparticles

Krawczyk

Korbutowicz

Szukiewicz

et al. 2022

Sensors

View full text Add to dashboard Cite

The electric properties and chemical and thermal stability of gallium oxide β-Ga2O3 make it a promising material for a wide variety of electronic devices, including chemiresistive gas sensors. However, p-type doping of β-Ga2O3 still remains a challenge. A β-Ga2O3 epitaxial layer with a highly developed surface was synthesized on gold electrodes on a Al2O3 substrate via a Halide Vapor Phase Epitaxy (HVPE) method. The epitaxial layer was impregnated with an aqueous colloidal solution of gold nanoparticles with an average diameter of Au nanoparticle less than 5 nm. Electrical impedance of the layer was measured before and after modification with the Au nanoparticles in an ambient atmosphere, in dry nitrogen, and in air containing dimethyl sulfide C2H6S (DMS). After the impregnation of the β-Ga2O3 epitaxial layer with Au nanoparticles, its conductance increased, and its electric response to air containing DMS had been inversed. The introduction of Au nanoparticles at the surface of the metal oxide was responsible for the formation of an internal depleted region and p-type conductivity at the surface.

show abstract

CuO-Ga2O3 Thin Films as a Gas-Sensitive Material for Acetone Detection

Cited by 21 publications

References 100 publications

Effect of Coordinatively Unsaturated Sites in MOF‐Derived Highly Porous CuO for Catalyst‐Free ppb‐Level Gas Sensors

Effect of Coordinatively Unsaturated Sites in MOF‐Derived Highly Porous CuO for Catalyst‐Free ppb‐Level Gas Sensors

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

P-type Inversion at the Surface of β-Ga2O3 Epitaxial Layer Modified with Au Nanoparticles

Contact Info

Product

Resources

About