Simulation studies on the responses of ZnO-CuO/CNT nanocomposite based SAW sensor to various volatile organic chemicals

Abraham, Nelsa; Krishnakumar, R.; Unni, C.; Philip, Daizy

doi:10.1016/j.jsamd.2018.12.006

Cited by 33 publications

(20 citation statements)

References 33 publications

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“…Operation at RT is the biggest challenge for sensors based on metal oxide semiconductors, and this had led to the development of ways to overcome this inconvenience. These approaches include doping [ 92 , 93 , 94 ], obtaining heterojunctions from p and n-type semiconductors [ 95 , 96 ], developing special microstructures [ 97 , 98 ], and inducing oxygen vacancies or the use of composite materials [ 86 , 99 , 100 ]. Among the most used and known methods of synthesis of doped materials are chemical vapor deposition, the hydrothermal method, the sol-gel method, and thermal annealing [ 101 ].…”

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

“…For all types of sensors, including SAW sensors, it is important to operate at RT, and at the same time, to ensure that a signal is obtained at the lowest analyte concentrations. The reference metal oxide semiconductors used in the domain of sensors include In 2 O 3 [ 34 , 107 , 108 , 109 , 110 ], ZnO [ 45 , 111 , 112 , 113 ], Co 3 O 4 [ 114 , 115 , 116 ], SnO 2 [ 99 , 117 ], CuO/Cu 2 O [ 100 , 118 ], TiO 2 [ 24 , 119 ], NiO [ 58 , 120 ], Fe 2 O 3 [ 121 , 122 ], and WO 3 [ 23 , 123 ]. They were most often used to detect volatile organic compounds, hydrogen, ammonia, etc.…”

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

“…In the literature, there are studies that present different methods through which gas detection with these materials was obtained at low temperatures, or even at RT [ 11 , 83 , 100 , 124 ], also for SAW sensors. For example, Wang et al [ 81 ] developed a SAW sensor based on copper-ion-doped polyaniline/tungsten oxide nanocomposite for NO detection at RT [ 90 ].…”

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

“…Among the gases most targeted for detection using ZnO- and ZnO-based materials in SAW sensors, as shown in Table 2 , are hydrogen [ 45 , 112 ], acetone [ 100 , 165 ], hydrogen sulfide [ 82 , 166 ], ethanol [ 44 , 100 ], and ammonia [ 80 , 150 ]. Of these, most RT SAW sensors were made for hydrogen, ammonia and ethanol, for which sensitivities between 11 and 0.005 Hz/ppm were obtained ( Table 2 ) [ 1 ].…”

Section: Zno In Saw Sensorsmentioning

confidence: 99%

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ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.

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Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

Section: Zno In Saw Sensorsmentioning

confidence: 99%

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ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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“…Richardson et al have used 3D-FEM simulation to compare insertion loss and mass sensitivity of SAW sensors having microcavities filled with ZnO and nanocrystalline diamond (NCD) [29]. In a recent study, Abraham et al, achieved a significative improvement in sensitivity by functionalizing the SAW's sensing layer with ZnO-CuO nanocomposites in MOX-CNT nanocomposite [30]. In the present work, we first used MATLAB to rapidly simulate the behavior of a delay line.…”

Section: Introductionmentioning

confidence: 99%

Simulation/Experiment Confrontation, an Efficient Approach for Sensitive SAW Sensors Design

Achour

Attia

Zerrouki

et al. 2020

Sensors

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Sensitivity is one of the most important parameters to put in the foreground in all sensing applications. Its increase is therefore an ongoing challenge, particularly for surface acoustic wave (SAW) sensors. Herein, finite element method (FEM) simulation using COMSOL Multiphysics software is first used to simulate the physical and electrical properties of SAW delay line. Results indicate that 2D configuration permits to accurately obtain all pertinent parameters, as in 3D simulation, with very substantial time saving. A good agreement between calculation and experiment, in terms of transfer functions (S21 spectra), was also shown to evaluate the dependence of the SAW sensors sensitivity on the operating frequency; 2D simulations have been conducted on 104 MHz and 208 MHz delay lines, coated with a polyisobutylene (PIB) as sensitive layer to dichloromethane (DCM). A fourfold increase in sensitivity was obtained by doubling frequency. Both sensors were then realized and tested as chem-sensors to detect zinc ions in liquid media. 9-{[4-({[4-(9anthrylmethoxy)phenyl]sulfanyl} methyl)]methyl] anthracene (TDP-AN) was selected as the sensing layer. Results show a comparable response curves for both designed sensors, in terms of limit of detection and dissociation constants Kd values. On the other hand, experimental sensitivity values were of the order of [7.0 ± 2.8] × 108 [°/M] and [16.0 ± 7.6] × 108 [°/M] for 104 MHz and 208 MHz sensors, respectively, confirming that the sensitivity increases with frequency.

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Exploring the Contribution of Intelligent Nanomaterials in Gas Sensing

Onyinye Okechukwu,

Olayiwola Idris,

Umukoro

et al. 2024

ChemistrySelect

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Gas sensors are crucial in various industries like chemicals, food processing, pharmaceuticals, health monitoring through breath analysis, as well as in household and environmental monitoring to ensure human safety. Chemo‐resistive gas sensors based on metal oxides convert gas information into electrical signals by interacting with adsorption and desorption processes. For metal oxide semiconductor gas sensors, sensitivity and selectivity enhancements are achieved through doping, functionalization, composite formations, heterojunction creation, and morphological adjustments. The formation of heterojunctions notably boosts the efficacy of the sensing material, leveraging synergistic effects to reinforce adsorption rates, catalytic activity acceleration, and the depletion interface for electrons and holes. Over the past few decades, nanomaterials have played a critical role in gas sensing applications. They have enabled the detection of a wide array of harmful and polluting gases, as well as volatile organic compounds serving as disease biomarkers. Additionally, incorporating heterostructure nanomaterials into heterojunctions significantly impacts sensing performance and detection speed. This review discussed various types of gas sensing devices, categorizing them based on the sensing elements employed, each possessing its own set of unique advantages and disadvantages. Nevertheless, the review underscored the importance of several key parameters and factors that influence the performance of gas sensors. Additionally, recent advancements in the utilization of nanomaterial composites for gas sensor applications, particularly in the detection of gases such as ammonia, hydrogen sulphide, and sulphur dioxide vapours, were discussed. Furthermore, the review highlights recent research endeavours and fundamental parameters, including sensitivity, detection limits, selectivity, response times, and recovery times.

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Simulation studies on the responses of ZnO-CuO/CNT nanocomposite based SAW sensor to various volatile organic chemicals

Cited by 33 publications

References 33 publications

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Simulation/Experiment Confrontation, an Efficient Approach for Sensitive SAW Sensors Design

Exploring the Contribution of Intelligent Nanomaterials in Gas Sensing

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