ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties

Tomić, Milena; Claros, Martha; Gràcia, I.; Figueras, E.; Cané, C.; Vallejos, Stella

doi:10.3390/s21134509

Cited by 15 publications

(6 citation statements)

References 60 publications

(76 reference statements)

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“…A brief study of the hysteresis graph in Figure g showed that the device responds to NO at a concentration as low as 0.5 ppm. These results showcase the exceptional gas sensing property of green synthesized CuO/ZnO heterostructures at low operating temperatures and low analyte gas concentrations, unlike most chemically synthesized SMO that are responsive only at higher operating temperatures and high concentrations of analyte gas. − Another notable observation was that, that the increase in temperature (50 °C) did not have any adverse effects on the shape and quality of the bioplastic substrate. This means that the substrate could be used at operating temperatures slightly higher than RT.…”

Section: Resultsmentioning

confidence: 70%

Sustainable Approach toward the Development of Next-Generation Gas Sensors

Fathima

Jha

Bhat

2023

ACS Sustainable Chem. Eng.

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The increase in the usage of non-biodegradable substrates and the generation of toxic wastes from laboratories has led to a sharp increase in the pollution caused by the electronics industry. In this study, we report on a novel approach to tackle this by successfully fabricating a completely biodegradable and ecofriendly chemiresistive gas sensor. The substrate was made of bioplastic and was coated with a silk mesh. This substrate was thoroughly studied for its flexibility, tensile strength, biodegradability, and thermal stability. It was found that the bioplastic/silk substrate exhibited superior results as compared to the bioplastic substrate without silk. Further, a green synthesized CuO/ZnO heterostructure from clove extract was utilized as a receptor layer. It was observed that the device fabricated on a bioplastic/silk substrate outperforms the device with bioplastic substrates at room temperature, as well as at elevated temperature (i.e., 50 °C). The device exhibited an ideal piezotronics behavior demonstrating that the chemiresistive gas sensor with green synthesized CuO/ZnO heterostructures on a bioplastic/silk substrate can be very well used over curvilinear surfaces. Therefore, the sustainable approach toward the development of biodegradable and eco-friendly toxic gas sensors taken in this study can be an alternative to the current high-temperature sensors.

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Section: Resultsmentioning

confidence: 70%

Sustainable Approach toward the Development of Next-Generation Gas Sensors

Fathima

Jha

Bhat

2023

ACS Sustainable Chem. Eng.

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“…The Au‐modified ZnO films exhibited remarkable response and sensitivity, particularly towards NO 2 and ethanol, with a 47‐fold more robust response to 10 ppm NO 2 than the unmodified ZnO structures with 39.96 % ppm −1 sensitivity and 26 parts per billion (ppb) LOD. The catalytic nature of the Au nanoparticles, the gas‐sensing mechanism induced by the nano‐interfaces between ZnO and Au, and the presence of oxygen vacancies are all aspects that contributed to these results [150] …”

Section: Development Of Materials By Aacvd For Carious Applicationsmentioning

confidence: 98%

“…The catalytic nature of the Au nanoparticles, the gas-sensing mechanism induced by the nano-interfaces between ZnO and Au, and the presence of oxygen vacancies are all aspects that contributed to these results. [150] 4.8. Super-Hydrophobic Thin Films Superhydrophobic surfaces are an exciting research area that has established their worth in various technological fields of aerospace, automotive, construction, medical, and optical.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Recent Advances in Processing and Applications of Heterobimetallic Oxide Thin Films by Aerosol‐Assisted Chemical Vapor Deposition

Ehsan

Shah

Basha

et al. 2021

The Chemical Record

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The fabrication of smart, efficient, and innovative devices critically needs highly refined thin‐film nanomaterials; therefore, facile, scalable, and economical methods of thin films production are highly sought‐after for the sustainable growth of the hi‐tech industry. The chemical vapor deposition (CVD) technique is widely implemented at the industrial level due to its versatile features. However, common issues with a precursor, such as reduced volatility and thermal stability, restrict the use of CVD to produce novel and unique materials. A modified CVD approach, named aerosol‐assisted CVD (AACVD), has been the center of attention due to its remarkable tendency to fabricate uniform, homogenous, and distinct nano‐architecture thin films in an uncomplicated and straightforward manner. Above all, AACVD can utilize any custom‐made or commercially available precursors, which can be transformed into a transparent solution in a common organic solvent; thus, a vast array of compounds can be used for the formation of nanomaterial thin films. This review article highlights the importance of AACVD in fabricating heterobimetallic oxide thin films and their potential in making energy production (e. g., photoelectrochemical water splitting), energy storage (e. g., supercapacitors), and environmental protection (e. g., electrochemical sensors) devices. A heterobimetallic oxide system involves two metallic species either in a composite, solid solution, or metal‐doped metal oxides. Moreover, the AACVD tunable parameters, such as temperature, deposition time, and precursor, which drastically affect thin films microstructure and their performance in device applications, are also discussed. Lastly, the key challenges and issues of scaling up AACVD to the industrial level and processing for emerging functional materials are also highlighted.

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“…Furthermore, even at a lower ethanol concentration of 10 ppm, the composite material exhibited a good response value of 63 and fast response/recovery times of 4 s/5 s. However, it is worth noting that without Au functionalization, the sensing performance of single composite n-n MOS materials does not seem to be ideal. Tomic et al 172 conducted experimental studies on Au/ZnO, Fe 2 O 3 /ZnO, Cu 2 O/ZnO, and pure ZnO samples to investigate the effect of modifiers on ZnO. Sensing detection showed that Au/ZnO exhibited the best sensing performance, while the pure ZnO sample exhibited the worst performance.…”

Section: Dalton Transactions Perspectivementioning

confidence: 99%