Surface acoustic wave based H2S gas sensors incorporating sensitive layers of single wall carbon nanotubes decorated with Cu nanoparticles

Asad, Mohsen; Sheikhi, Mohammad Hossein

doi:10.1016/j.snb.2014.03.024

Cited by 92 publications

(41 citation statements)

References 45 publications

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“…The present sensitive interfaces for sensing H 2 S are mainly tin oxide (SnO 2 ) and their derivatives, which appears to have a high sensitivity and fast response. However, similar to the metal oxide sensor described above, it still suffers from a high working temperature up to 400 °C [14,15,16,17,18]. Hence, exploration in new gas-sensitive materials is the main topic in the investigation of SAW H 2 S sensors.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Sensitivity of a Hydrogen Sulfide Sensor Based on Surface Acoustic Waves at Room Temperature

Liu

Wang

Zhang

et al. 2018

Sensors

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In this contribution, a new surface acoustic wave (SAW)-based sensor was proposed for sensing hydrogen sulfide (H2S) at room temperature (30 °C), which was composed of a phase discrimination circuit, a SAW-sensing device patterned with delay line, and a triethanolamine (TEA) coating along the SAW propagation path of the sensing device. The TEA was chosen as the sensitive interface for H2S sensing, owing to the high adsorption efficiency by van der Waals’ interactions and hydrogen bonds with H2S molecules at room temperature. The adsorption in TEA towards H2S modulates the SAW propagation, and the change in the corresponding phase was converted into voltage signal proportional to H2S concentration was collected as the sensor signal. A SAW delay line patterned on Y-cut quartz substrate with Al metallization was developed photographically, and lower insertion and excellent temperature stability were achieved thanks to the single-phase unidirectional transducers (SPUDTs) and lower cross-sensitivity of the piezoelectric substrate. The synthesized TEA by the reaction of ethylene oxide and ammonia was dropped into the SAW propagation path of the developed SAW device to build the H2S sensor. The developed SAW sensor was characterized by being collecting into the phase discrimination circuit. The gas experimental results appear that fast response (7 s at 4 ppm H2S), high sensitivity (0.152 mV/ppm) and lower detection limit (0.15 ppm) were achieved at room temperature. It means the proposed SAW sensor will be promising for H2S sensing.

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Section: Introductionmentioning

confidence: 99%

Enhanced Sensitivity of a Hydrogen Sulfide Sensor Based on Surface Acoustic Waves at Room Temperature

Liu

Wang

Zhang

et al. 2018

Sensors

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“…There is a rapidly growing interest in development of highly sensitive and selective chemical sensors for detection of various chemical species and applications in explosives vapors detection, environmental monitoring, healthcare, and automobile . Different types of chemical sensors have been developed such as chemiresistive sensors, colorimetric sensors, piezoelectric sensors, surface acoustic wave sensors, and fluorescence sensors . Among many types of chemical sensors, chemiresistive sensors and optical sensors are one of the most attractive sensing types because of simple operating principle by measuring resistance, color, or fluorescence changes when chemical molecules are introduced to the sensors, which can potentially minimize sensor system for portable applications.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Nanostructures for High Performance Chemiresistive and Optical Sensors

Choi

Persano

Camposeo

et al. 2017

Macro Materials & Eng

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Chemical sensors have been essential components in recent years due to the gathering attention in environmental monitoring and healthcare. In this review, the authors comprehensively highlight recent progresses on the 1D chemiresistive-type sensors based on semiconductor metal oxides (SMOs) and optical-type sensors, which are prepared by electrospinning technique. In the part of chemiresistive-type sensors, diverse synthesis techniques for 1D SMO nanofibrous structure are presented with controlled microstructure and surface morphology. In addition, unique functionalization routes of emerging nanocatalysts encapsulated by bio-inspired templates are described for the next generation catalyst on the 1D SMO nanofibers (NFs). For the optical-type sensors, new classes of 1D NFs employing specific absorption and emission properties are introduced. In particular, diverse 1D NF-based colorimetric and fluorescence sensors as well as Raman and surface-enhanced Raman scattering sensors are covered in the view point of material preparation and optical sensing properties. Finally, the authors prospect future research directions to overcome current limitations and challenges to achieve high performance chemical sensors.

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“…The birth of the so-called surface acoustic wave (SAW) sensor technology opens up a new way for methane gas sensing. By means of sensitive materials with specific selectivity, SAW sensors have some excellent features such as high-sensitivity, ambient-temperature operation, simple packaging requirements, low cost, fast response, small size, and large dynamic range [ 9 , 10 ]. A typical SAW-based gas sensor configuration is composed of a differential oscillator array, and some sensitive materials deposited in sensing channels on the SAW propagation path of the SAW devices.…”

Section: Introductionmentioning

confidence: 99%

Development of a Room Temperature SAW Methane Gas Sensor Incorporating a Supramolecular Cryptophane A Coating

Wang

Liu

et al. 2016

Sensors

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A new room temperature supra-molecular cryptophane A (CrypA)-coated surface acoustic wave (SAW) sensor for sensing methane gas is presented. The sensor is composed of differential resonator-oscillators, a supra-molecular CrypA coated along the acoustic propagation path, and a frequency signal acquisition module (FSAM). A two-port SAW resonator configuration with low insertion loss, single resonation mode, and high quality factor was designed on a temperature-compensated ST-X quartz substrate, and as the feedback of the differntial oscillators. Prior to development, the coupling of modes (COM) simulation was conducted to predict the device performance. The supramolecular CrypA was synthesized from vanillyl alcohol using a double trimerisation method and deposited onto the SAW propagation path of the sensing resonators via different film deposition methods. Experiential results indicate the CrypA-coated sensor made using a dropping method exhibits higher sensor response compared to the unit prepared by the spinning approach because of the obviously larger surface roughness. Fast response and excellent repeatability were observed in gas sensing experiments, and the estimated detection limit and measured sensitivity are ~0.05% and ~204 Hz/%, respectively.

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Surface acoustic wave based H2S gas sensors incorporating sensitive layers of single wall carbon nanotubes decorated with Cu nanoparticles

Cited by 92 publications

References 45 publications

Enhanced Sensitivity of a Hydrogen Sulfide Sensor Based on Surface Acoustic Waves at Room Temperature

Enhanced Sensitivity of a Hydrogen Sulfide Sensor Based on Surface Acoustic Waves at Room Temperature

Electrospun Nanostructures for High Performance Chemiresistive and Optical Sensors

Development of a Room Temperature SAW Methane Gas Sensor Incorporating a Supramolecular Cryptophane A Coating

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