Polymer/Ordered Mesoporous Carbon Nanocomposite Platelets as Superior Sensing Materials for Gas Detection with Surface Acoustic Wave Devices

Ku, Pei-Hsin; Hsiao, Chuan-Hung; Chen, Meijing; Lin, Ting‐Han; Li, Yi-Tian; Liu, Szu-Chieh; Tang, Kea-Tiong; Yao, Da‐Jeng; Yang, Chia-Min

doi:10.1021/la3015892

Cited by 24 publications

(15 citation statements)

References 54 publications

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“…The first type was platelet mesoporous carbon (CMK); the other type was mesoporous carbon hollow nanospheres (HMC). 15 The advantages of using mesoporous carbon materials include a large specific surface area and a 3-D nanoporous structure, high electrical and thermal conductivity, great mechanical strength, and highly efficient gas diffusion. In the aspect of absorption capacity, the film PNVP/HMC that we used on a SAW substrate compared favorably with PNVP/CMK, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The explosive characteristic of methane is of concern for public safety. In addition, people breathing methane at a high concentration might suffer health problems, resulting in an oxygen deficiency, increased breathing and pulse rates, emotional upset and even death.Many gas-sensing methods include sensor arrays demonstrated with various catalytic metals and chemical compounds, or an opticalfiber gas sensor.12,13 The modalities for a gas-sensing array include surface-acoustic-wave (SAW) [14][15][16] and quartz-crystal devices, micromachined cantilevers, 17 and semiconducting metal-oxide (MOX) resistors. 18 In 2006 Star's team used a gas-sensor array with coated electrochemical metal films to detect a mixture of gases such as H 2 , CH 4 , H 2 S and CO. 19 The advantages of optical-fiber gas sensors are high sensitivity, rapid response and long-term stability.…”

mentioning

confidence: 99%

“…12,13 The modalities for a gas-sensing array include surface-acoustic-wave (SAW) [14][15][16] and quartz-crystal devices, micromachined cantilevers, 17 and semiconducting metal-oxide (MOX) resistors. 18 In 2006 Star's team used a gas-sensor array with coated electrochemical metal films to detect a mixture of gases such as H 2 , CH 4 , H 2 S and CO. 19 The advantages of optical-fiber gas sensors are high sensitivity, rapid response and long-term stability.…”

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confidence: 99%

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Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

Chiang

Hao

Yang

et al. 2018

ECS J. Solid State Sci. Technol.

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A surface-acoustic-wave (SAW) sensor was used to detect gaseous chemical compounds ammonia, methane and their mixtures in varied environmental conditions. The sensing chamber was improved using top-cover PMMA with 200-μL fluidic channels, compared with a traditional 1-L four-neck bottle. Small concentrations of ammonia (≈ 250 ppb) and methane (≈ 9 ppm) were detectable with this SAW sensor array with a sensing film, PNVP with mesoporous carbon hollow nanospheres. Tests of the stability and repeatability showed that the noise of the frequency change is about ± 12.5 Hz within 410 s; the signal loss is less than 9% after 16 detection cycles. According to the results of the sensing measurements, the frequency shift of the ammonia/methane mixture was equivalent to the sum of the frequency shifts of ammonia and methane. In highly humid conditions the loss of signal of ammonia was much larger than that of methane. Based on the results of quantitative measurements of ammonia/methane gaseous mixtures, we found that the superposition effect between sensing signals for ammonia and methane was useable to predict the signal intensity for ammonia/methane gaseous mixtures at varied relative concentrations. Because of the threat of environmental pollution and its risk to human health, there is a great demand for a gas sensor with high sensitivity, rapid response and a low detection limit that is applicable to a mixture of gases for real-time monitoring. An electronic nose has been widely used in many applications such as for the quality of indoor air, food safety, environmental monitoring and military applications, even in national security issues.1,2 Substantial consideration has been devoted to develop an electronic-nose system in gas sensing of volatile organic compounds without having to identify specific molecular components.3-7 Compared with conventional methods for the analysis of gases, such as use of a gas chromatograph combined with a mass spectrometer (GC-MS) or a (Fourier-transform) infrared spectrometer, an electronic nose has several advantages greatly beneficial for gas detection, including high-throughput sample detection, small size and moderate cost. 8,9 Furthermore, an electronic nose is suitable for nonexpert users and easily applicable to daily life. 10 In traditional biomedical testing, the concentration of ammonia is an important biomarker for the detection of uremia and chronic liver disease. The level of ammonia in the breath of chronic hepatitis patients (0.745 ppm) is significantly greater than that for a normal person (0.278 ppm); 11 patients who have liver failure exhale 4.8-ppm ammonia in their breath. The explosive characteristic of methane is of concern for public safety. In addition, people breathing methane at a high concentration might suffer health problems, resulting in an oxygen deficiency, increased breathing and pulse rates, emotional upset and even death.Many gas-sensing methods include sensor arrays demonstrated with various catalytic metals and chemical compounds, or an opticalfiber gas...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

Chiang

Hao

Yang

et al. 2018

ECS J. Solid State Sci. Technol.

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“…This may result in a poor (e.g., parts per million level) gas concentration. Polymer/OMC nanocomposites that serve as superior sensing materials for detecting gravimetric gas were demonstrated [99]. As shown in Fig.…”

Section: Superior Nanocomposite Sensing Materialsmentioning

confidence: 99%

Smart Sensors and Systems

Lin

Kyung²,

Yasuura³

et al. 2015

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“…Surface acoustic wave (SAW)-based gas sensors have the advantages of high sensitivity and fast response [9,10]. Readout circuits for SAW sensors have been developed for years; however, the corresponding power consumption is high and the data resolution is not sufficient for detecting gases at low concentration [11,12].…”

Section: Introductionmentioning

confidence: 99%

A Low Noise CMOS Readout Based on a Polymer-Coated SAW Array for Miniature Electronic Nose

Liu

Chiu

et al. 2016

Sensors

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An electronic nose (E-Nose) is one of the applications for surface acoustic wave (SAW) sensors. In this paper, we present a low-noise complementary metal–oxide–semiconductor (CMOS) readout application-specific integrated circuit (ASIC) based on an SAW sensor array for achieving a miniature E-Nose. The center frequency of the SAW sensors was measured to be approximately 114 MHz. Because of interference between the sensors, we designed a low-noise CMOS frequency readout circuit to enable the SAW sensor to obtain frequency variation. The proposed circuit was fabricated in Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm 1P6M CMOS process technology. The total chip size was nearly 1203 × 1203 μm2. The chip was operated at a supply voltage of 1 V for a digital circuit and 1.8 V for an analog circuit. The least measurable difference between frequencies was 4 Hz. The detection limit of the system, when estimated using methanol and ethanol, was 0.1 ppm. Their linearity was in the range of 0.1 to 26,000 ppm. The power consumption levels of the analog and digital circuits were 1.742 mW and 761 μW, respectively.

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Polymer/Ordered Mesoporous Carbon Nanocomposite Platelets as Superior Sensing Materials for Gas Detection with Surface Acoustic Wave Devices

Cited by 24 publications

References 54 publications

Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

Smart Sensors and Systems

A Low Noise CMOS Readout Based on a Polymer-Coated SAW Array for Miniature Electronic Nose

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