Zeolite A coated Zn1−XCuXO MOS sensors for NO gas detection

Galioglu, Sezin; Karaduman, Irmak; Çorlu, Tuğba; Akata, Burcu; Yıldırım, Mehmet Ali; Ateş, Aytunç; Acar, Selim

doi:10.1007/s10854-017-8042-8

Cited by 12 publications

(9 citation statements)

References 48 publications

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“…It is well-known that selectivity is an important parameter to evaluate the properties of gas sensors. ,,− Figure shows the selectivity performance of the sensors toward NO, CO, NH 3 , H 2 , NO 2 , formaldehyde, ethanol, acetone, and toluene at 70 °C. The response of the WO 3 -1wt%In 2 O 3 -1wt%Nb 2 O 5 sensor to 100 ppb NO is 56.1, while the responses to 100 ppb NO 2 , 10 ppm formaldehyde, 20 ppm of CO, 20 ppm of H 2 , 20 ppm of NH 3 , 50 ppm ethanol, 50 ppm acetone, and 50 ppm toluene are 2.2, 4.0, 3.7, 3.3, 2.3, and 1.1, 1.1, and 1.1 (the last three target gases had the same response), respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Qiu

et al. 2018

ACS Appl. Mater. Interfaces

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Fast, sensitive, and precise detection of nitric oxide (NO) is critical to many applications in environmental monitoring and early disease diagnosis via respiratory testing. An effective detection system requires a sensor to detect NO gas at the parts per billion (ppb) level, and this system should possess a high degree of anti-interference selectivity. To achieve these targets, a series of gas sensor thin films based on intrinsic WO3, one-additive-doped WO3 (prepared by doping In2O3 or Nb2O5), and two-additive-doped WO3 (synthesized by doping with In2O3 and Nb2O5) oxides were successfully grown. By analyzing the properties of sensitivity, selectivity, responsiveness, and recovery time of the gas sensors, we found that WO3-1wt%In2O3-1wt%Nb2O5 has overwhelming advantages over intrinsic WO3, WO3-In2O3, and WO3-Nb2O5. A sensing response value of 2.4 was observed for NO concentrations as low as 20 ppb from the WO3-1wt%In2O3-1wt%Nb2O5 sensor. With 100 ppb NO gas, the WO3-1wt%In2O3-1wt%Nb2O5 sensor achieved a high response of 56.1 at 70 °C, which is a state-of-the-art performance for NO detection at low working temperature settings. WO3-1wt%In2O3-1wt%Nb2O5 also yields significantly improved selectivity and stability over intrinsic WO3, WO3-In2O3, and WO3-Nb2O5. Studies on the sensing mechanism show that the grain size, rather than the n–n heterostructure effect, plays a dominant role in the observed results. By decreasing the grain size so that it is close to the thickness of the space-charge layer, the sensing response is enhanced. Although room remains to further improve the sensing properties, the performance of WO3-1wt%In2O3-1wt%Nb2O5 is sufficient for implementation in low-content NO detection devices.

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Section: Results and Discussionmentioning

confidence: 99%

Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Qiu

et al. 2018

ACS Appl. Mater. Interfaces

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“…As for the determination of gas sensing behaviors belonging to the compounds prepared in this work, the samples are firstly cut in appropriate sizes (9 × 25 mm) and silver IDT contacts are carried out on NRs as provided in Figure 1. Electrical and gas sensing measurements are performed with Keitheley 2400 DC sourcemeter, LakeShore 325 temperature controller and MKS series mass flow controllers in Physics Department of Gazi University (as is seen in the previous works in Galioglu et al, 2018; Karaduman, Er, Çelikkan, Erk, & Acar, 2017; Soltabayev, Yıldırım, Ateş, & Acar, 2019).…”

Section: Methodsmentioning

confidence: 99%

Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Bulut

Öztürk

Acar

2021

Microscopy Res & Technique

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In the present study, the one‐dimensional ZnO nanorod structures are produced within the different nickel and aluminum molecular weight ratios of 0–7% using the hydrothermal method. It is found that the aluminum (Al) and nickel (Ni) impurities with different ionic radius, chemical valence, and electron configurations of outer shell cause to vary the fundamental characteristic features including the crystallinity quality, crystallite size, surface morphology, nanorod diameter, optical absorbance, energy band gap, resistance, gas response, and gas sensing properties. The structural analyses performed by powder X‐ray diffraction (XRD) and scanning electron microscopy (SEM) indicate that the samples are found to crystallize in the hexagonal wurtzite structure. The presence of optimum nickel and aluminum in the crystal system improves considerably the crystallinity quality and surface morphology. Additionally, the combination of electron dispersive X‐ray (EDX) and XRD results declare that the Ni and Al impurities incorporate successfully into the ZnO crystal structure. Moreover, the diameters of nanorod structures in 1D orientation are determined to be 80 nm or below. The hexagonal wurtzite‐type ZnO nanorod structure prepared by 5% Ni has more space between the nanorods and thus presents higher response to the CO2 detection. Further, the optical absorbance spectra display that the band gap value is observed to decrease regularly with the increment in the doping level as a result of band shrinkage effect depending on the enhancement of mobile hole carrier concentrations in the crystal structure. In other words, the doping mechanism leads to vary the homogeneities in the interfacial charges, nanorod diameters, ZnO oxide layer composition and thickness. The last test conducted in this study is responsible for the determination of CO2 gas sensing levels. The obtained gas sensing results are further compared with each other and literature findings. It is observed that 5% Ni‐doped sample provides more successful results than other samples in the sensing CO2 gas at the different concentrations. All in all, the paper establishing a strong methodology between doping mechanism and change in the fundamental characteristic features of hexagonal wurtzite‐type ZnO with the aid of advanced microscopy techniques will become pioneering research to answer key questions in materials sciences and electronic research.

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“…Throughout our previous works, samples were produced in various cycles and SILAR cycles were optimized [14][15][16][17]. It has been determined in our previous studies that the most suitable cycles are 20, 30 and 40.…”

Section: Methodsmentioning

confidence: 99%

“…For structural, morphological, compositional and optical studies, the Panalytical empyrean X-Ray Diffractometer (using Cu K λ=1.5405Å radiation) and the FEI Quanta FEG 450 model Scanning Electron Microscope (SEM) were used, respectively. The gas-sensing performance of the sensors has been carried out a computer-controlled measurement system [14][15]. The gas sensor was connected into the sensing system according to the test circuit and the changes of sensor resistance were recorded in real time [16].…”

Section: Methodsmentioning

confidence: 99%

“…As it is a low temperature process, oxidation and corrosion of the base material is prevented. From this point of view, SILAR method includes several advantages such as production of well-defined oxides with excellent homogeneity and incorporation of dopant materials with extreme purity for fabrication of gas sensor components [14]. The SILAR method has many advantages: (i) to add the film in any proportion to any element, it is enough to include it only in certain forms of the cationic or anionic solution, and this is a very simple way.…”

Section: Introductionmentioning

confidence: 99%

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Low Concentration NO Gas Detection Of SnO2 And Zn0.50Sn0.50O Sensors

Çorlu

Yıldırım

et al. 2020

Politeknik Dergisi

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Figure. SEM Analysis (Zn0.50Sn0.50O) Aim In this study, the gas sensing properties of SnO2 and Zn0.50Sn0.50O samples produced by Succession Ionic Layer Adsorption and Reaction (SILAR) method with different SILAR cycles against NO gas were investigated. Design & Methodology In this study, sensors were produced with the cheap, practical and fabricated Succession Ionic Layer Adsorption and Reaction (SILAR) method. Originality The sensors can be seen to show high responses to a relatively low NO gas concentration, such as 50 ppb. Findings For 50 ppb NO gas concentration, 3.01, 3.74% and 4.16% sensitivities were obtained for 20, 30 and 40 cycles, respectively, while for 25 ppm 18%, 20% and 34% sensitivities were obtained, respectively. Conclusion The results show that Zn doping greatly increases the response sensors. Also, Zn doping introduces some defects in the sensors, and these defects make the structure unstable and more possible to react with gas molecules.

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Zeolite A coated Zn1−XCuXO MOS sensors for NO gas detection

Cited by 12 publications

References 48 publications

Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Low Concentration NO Gas Detection Of SnO2 And Zn0.50Sn0.50O Sensors

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Zeolite A coated Zn1−XCuXO MOS sensors for NO gas detection

Cited by 12 publications

References 48 publications

Nitric Oxide Detector Based on WO3-1wt%In2O3-1wt%Nb2O5 with State-of-the-Art Selectivity and ppb-Level Sensitivity

Nitric Oxide Detector Based on WO3-1wt%In2O3-1wt%Nb2O5 with State-of-the-Art Selectivity and ppb-Level Sensitivity

Effect of Ni and Al doping on structural, optical, and CO2 gas sensing properties of 1D ZnO nanorods produced by hydrothermal method

Low Concentration NO Gas Detection Of SnO2 And Zn0.50Sn0.50O Sensors

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Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Nitric Oxide Detector Based on WO₃-1wt%In₂O₃-1wt%Nb₂O₅ with State-of-the-Art Selectivity and ppb-Level Sensitivity

Effect of Ni and Al doping on structural, optical, and CO₂ gas sensing properties of 1D ZnO nanorods produced by hydrothermal method