NO<sub>2</sub> Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets

Kim, Min Young; Hwang, Jeong Yun; Mirzaei, Ali; Choi, Sun‐Woo; Kim, Sang‐il; Kim, Hyun-Sik; Kim, Sun–Jae; Roh, Jong Wook; Choi, Myung Sik; Lee, Kyu Hyoung; Lee, Seung Yong; Jin, Changhyun

doi:10.1155/2023/9021169

Cited by 15 publications

(4 citation statements)

References 57 publications

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“…To further highlight this work, Table lists the performances of NO 2 gas sensors using various sensing membranes. − It was understood that the NO 2 gas sensor using a sensing membrane with gold-black NP-decorated Ga 2 O 3 nanorods is a promising candidate applied in high-performance environment systems.…”

Section: Resultsmentioning

confidence: 99%

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Chu,

Wu,

Yeh

et al. 2023

ACS Sens.

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In this work, a vapor cooling condensation system was utilized to deposit various amounts of p-type gold-black nanoparticles (NPs) onto the surface of n-type gallium oxide (Ga 2 O 3 ) nanorods forming p−n heterojunction-structured sensing membranes of nitrogen dioxide (NO 2 ) gas sensors. The role and the sensing mechanism of the various gold-black NP-decorated Ga 2 O 3 nanorods in NO 2 gas sensors were investigated. The coverage and atomic percentage of the sensing membranes were observed using high-resolution transmission electron microscopy (HRTEM) measurements and energy-dispersive spectroscopy (EDS), respectively. For the NO 2 gas sensor using the sensing membrane of 60 s-deposited gold-black NP-decorated Ga 2 O 3 nanorods under a NO 2 concentration of 10 ppm, the highest responsivity of 5221.1% was obtained. This result was attributed to the spillover effect and the formation of the p−n heterojunction, which increased more ionized-oxygen adsorption sites and promoted the reaction between NO 2 gas and Ga 2 O 3 nanorods. Furthermore, the NO 2 gas sensor could detect the low NO 2 concentration of 100 ppb and achieved a responsivity of 56.9%. The resulting NO 2 gas sensor also exhibited excellent selectivity for detecting NO 2 gas, with higher responsivity at a NO 2 concentration of 10 ppm compared with that of the C 2 H 5 OH and NH 3 concentrations of 100 ppm.

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Section: Resultsmentioning

confidence: 99%

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Chu,

Wu,

Yeh

et al. 2023

ACS Sens.

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“…This was associated with a high regression coefficient of 0.999 versus Freundlich's model. So, it indicates a monolayer of lead ions that are and uniformly sequestration on to ZnO-NR surface [31].…”

Section: Adsorption Isotherm Modeling Adsorption Isothermsmentioning

confidence: 99%

Adsorption Thermodynamics, Modeling, and Kinetics Studies for the Removal of Lead Ions Using ZnO Nanorods

Ata,

Tabassum,

Shaheed

et al. 2023

Adsorption Science & Technology

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In the present investigation, zinc oxide nanorods (ZnO-NR) were synthesized via the hydrothermal method using ZnCl2 as a zinc ion precursor in the presence of cetyltrimethylammonium bromide. Synthesized ZnO-NR was featured using advanced techniques including XRD, PL, SEM, and UV-visible spectroscopy. The role of these assynthesized ZnO-NR was evaluated for the sequestration of lead ions in batch mode. The elimination of lead ions was achieved at pH 6-7 using a 0.06 g adsorbent dose, 25 min contact time, 25 mg/L initial lead ion concentration, 323 K temperature, and 200 rpm agitation speed. A thermodynamic study revealed the endothermic nature of lead ion sequestration onto ZnO-NR. The lead ion sequestration followed kinetic (pseudo-second-order) and isotherm (Langmuir) models. The lead ions were eliminated up to 142 mg/g at the optimum level of affecting variables. The ZnO-NR might be a potential adsorbent for lead ion removal from industrial effluents.

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“…Hybridization between materials is considered a promising strategy to overcome the drawbacks of organic and inorganic materials for gas sensing. It offers new or enhanced functionalities through a synergic interaction between the two phases [22][23][24]. So far, different materials, such as inorganic semiconductors, metal oxides and conducting polymers, have been used to fabricate sensors with a small size, low power consumption, high sensitivity, and high reliability [16,22,[25][26][27].…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Ternary Hybrid Materials for Highly Sensitive Acetone Sensing at Room Temperature

et al. 2023

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The performance of a conventional metal oxide sensor (MOX) is highly dependent on its high operating temperature. Many researchers have tried to solve the problem by exploring hybrid materials. On the other hand, ternary hybrid materials have emerged as a promising class of materials with unique properties and potential applications in various fields, be it environmental or medical, such as in breath analyzers for prediabetes analysis. This article focuses on the synthesis method, characterization, and application of ternary hybrid materials for room-temperature sensors, as well as recent advances and future developments in the field. The materials consist of three different components, metal oxide (Fe3O4), polymer (polyaniline) and carbon-based materials (reduced graphene oxide), which were synthesized using in-situ methods. Five samples were prepared in different ratios. The properties of these materials were characterized using techniques such as X-ray diffraction (XRD), Raman, scanning electron microscope (SEM) and transmission electron microscopy (TEM). The XRD and Raman analyses showed the existence of all the individual constituents in the hybrid sample. SEM and TEM also showed a strong interaction between the constituent materials as a hybrid nanocomposite. The response and recovery time were studied against 1, 10 and 100 ppm acetone. The results show that the sample with 10 wt%Fe3O4-PANI-RGO (S2_10) has a reaction and recovery time < 32 s against the above ppm and has the highest sensing response at room temperature.

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NO₂ Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets

Cited by 15 publications

References 57 publications

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Adsorption Thermodynamics, Modeling, and Kinetics Studies for the Removal of Lead Ions Using ZnO Nanorods

Ternary Hybrid Materials for Highly Sensitive Acetone Sensing at Room Temperature

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NO2 Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets

Cited by 15 publications

References 57 publications

Sensing Mechanism and Characterization of NO2 Gas Sensors Using Gold-Black NP-Decorated Ga2O3 Nanorod Sensing Membranes

Sensing Mechanism and Characterization of NO2 Gas Sensors Using Gold-Black NP-Decorated Ga2O3 Nanorod Sensing Membranes

Adsorption Thermodynamics, Modeling, and Kinetics Studies for the Removal of Lead Ions Using ZnO Nanorods

Ternary Hybrid Materials for Highly Sensitive Acetone Sensing at Room Temperature

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Product

Resources

About

NO₂ Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes