Sensitive and Stable Gas Ionization Sensor Based on 3-D Single-Walled Carbon Nanotube Networks Suspended on ZnO Nanorods

Lee, Jongtaek; Park, Taehee; Lee, Jungwoo; Yi, Whikun

doi:10.1109/jsen.2014.2337656

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…The identification and measurement of volatile organic compounds (VOCs) is important in a variety of areas including the detection and monitoring of hazardous gases causing environmental pollution, food quality monitoring, indoor air quality monitoring and breath analysis for medical diagnosis [1,2]. Chemical sensor array-based sensing systems possess the advantages of real-time detection of VOCs, low cost of material processing, miniaturization of the sensor structure with portability [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Metal-phthalocyanine modified doped polyaniline for VOC sensing applications

Sinha

Verma

Panda

2020

Flex. Print. Electron.

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The identification and measurement of volatile organic compounds (VOCs) is needed in a variety of applications including air quality monitoring, air pollution measurement, food quality monitoring, and breath analysis-based disease diagnosis etc. The monitoring of the VOCs related to different applications areas can ensure quality health and safety. Arrays of chemical sensors have the features to provide the required identification and measurement of the VOCs. Chemical sensors made from nanostructures of polyaniline (PANI) as the base sensing material have several advantages including tunable properties, room temperature sensing and the potential of being amenable to the printing processes. Metal (M) phthalocyanines (Pc), on account of different cavity structures, have the ability to selectively interact with different gases. In the reported studies most of the MPcs have been noncovalently deposited on the sensing platforms, or attached with the base polymer via π-π conjugation. The covalent bonding of MPcs with the sensing polymer may have several possible advantages including stability (no leaching or evaporation of the compounds), well-defined available interfaces for interaction and a longer operational lifetime. In this work, the camphor sulphonic acid (CSA) doped PANI nanostructures were covalently bonded with six metal embedded phthalocyanines (Cu-Pc, Mn-Pc, Zn-Pc, Fe-Pc, Ni-Pc and Co-Pc) and investigated as the sensor materials for the sensing of four VOCs: acetone, isopropanol, ethanol and formaldehyde, in a 150-500 ppb concentration range. The resultant chemical sensor array response in terms of relative change in resistance of the sensing materials upon VOC exposure was analysed using principal component analysis, which resulted in clear discrimination among the subjected VOCs, thus making it useful for selective VOC sensing applications.

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Section: Introductionmentioning

confidence: 99%

“…Monitoring of VOCs in the indoor air and controlling them to a permissible safe limit is a health issue with evidence of Sick Building Syndrome [1]. Indoor air pollutants [17] especially VOCs such as acetone [18], formaldehyde [19], isopropanol [20], and ethanol [21,22] come from paint, cleaning sprays, and different household utilities.…”

Section: Introductionmentioning

confidence: 99%

Metal-phthalocyanine modified doped polyaniline for VOC sensing applications

Sinha

Verma

Panda

2020

Flex. Print. Electron.

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“…The breakdown process suffering from the degradation and oxidation of electrode materials , might be less suitable for the dynamic detection of the temporal variation of target gases. Besides, some of the reported IGSs tended to work at low gas pressure, which restricts the applications under realistic conditions. − …”

Section: Introductionmentioning

confidence: 99%

MEMS-Based Ionization Gas Sensors for VOCs with Array of Nanostructured Silicon Needles

Wang

Dong

et al. 2020

ACS Sens.

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Although volatile organic compound samples can be detected by gas nanosensors in adsorption principles, extreme concentrations of target gases imply the excessive adsorption, which would lead to a long recovery time and even a shortened lifetime. Herein, we report the observations of the ionization current sensing behavior on the volatile organic compounds in an ionization gas sensor with silicon-based nanostructures. The micro ionization gas sensor consists of a pair of silicon microneedle array electrodes covered by nanolayer structures and a microdischarge gas gap. The dynamic response behaviors of the sensors to the exposure of ethanol, acetone, and 2-chloroethyl ethyl sulfide have been carefully scrutinized. The sensor exhibits sound performances to the high-concentration volatile organic compounds with a fast-recovery property and could generate effective responses well at 36 V, namely, the safety operation voltages. It could be well understood by the Jesse effect where small proportion of impurities in gases could lead to an intensive increase in the overall ionization probability. Besides, the reproducibility, recovery time, sensitivity, and selectivity properties have been systematically characterized.

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“…Because of its unique quasi-one-dimensional atomic structure and superb mechanical and electronic properties, the CNT has been playing a significant role in emerging nanotechnology [10][11][12]. Purification or controlled synthesis of CNTs with selected helicity has not been achieved so far which has made the manufacturing of electronic devices with CNTs difficult.…”

Section: Introductionmentioning

confidence: 99%