A novel SnO2 gas sensor doped with carbon nanotubes operating at room temperature

Wei, Bee-Yu; Hsu, Ming-Chih; Su, Pi-Guey; Li, Hongming; Wu, Ren‐Jang; Lai, Hong-Jen

doi:10.1016/j.snb.2004.02.028

Cited by 367 publications

(60 citation statements)

References 29 publications

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“…[10][11][12] It was reported that the detectable range and sensitivity of the single wall carbon nanotubes (SWCNTs) could be widened and improved through doping technology. 4,13,14 SWCNT coated with Pb nanoparticles has high sensitivity to H 2 , 14 and SnO 2 /SWCNTs hybrid material shows an enhanced sensitivity to NO 2 .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of CO molecules on doped graphene: A first-principles study

et al. 2016

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As a typical kinds of toxic gases, CO plays an important role in environmental monitoring, control of chemical processes, space missions, agricultural and medical applications. Graphene is considered a potential candidate of gases sensor, so the adsorption of CO molecules on various graphene, including pristine graphene, Nitrogen-doped graphene (N-doped graphene) and Aluminum-doped graphene (Al-doped graphene), are studied by using first-principles calculations. The optimal configurations, adsorption energies, charge transfer, and electronic properties including band structures, density of states and differential charge density are obtained. The adsorption energies of CO molecules on pristine graphene and N-doped graphene are −0.01 eV, and −0.03 eV, respectively. In comparison, the adsorption energy of CO on Al-doped graphene is much larger, −2.69 eV. Our results also show that there occurs a large amount of charge transfer between CO molecules and graphene sheet after the adsorption, which suggests Al-doped graphene is more sensitive to the adsorption of CO than pristine graphene and N-doped graphene. Therefore, the sensitivity of gases on graphene can be drastically improved by introducing the suitable dopants.

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Section: Introductionmentioning

confidence: 99%

Adsorption of CO molecules on doped graphene: A first-principles study

et al. 2016

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“…Gases that could be detected under such conditions are NO 2 , NH 3 , H 2 S and a number of short-chain alcohols [1,2,3,4,5,6,7]. In this latter mode of operation UV photo-activation has also been shown to be effective [8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Vapor and Surface Morphology on the Low Temperature Response of Metal Oxide Semiconductor Gas Sensors

et al. 2015

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In this work the low temperature response of metal oxide semiconductor gas sensors is analyzed. Important characteristics of this low-temperature response are a pronounced selectivity to acid- and base-forming gases and a large disparity of response and recovery time constants which often leads to an integrator-type of gas response. We show that this kind of sensor performance is related to the trend of semiconductor gas sensors to adsorb water vapor in multi-layer form and that this ability is sensitively influenced by the surface morphology. In particular we show that surface roughness in the nanometer range enhances desorption of water from multi-layer adsorbates, enabling them to respond more swiftly to changes in the ambient humidity. Further experiments reveal that reactive gases, such as NO2 and NH3, which are easily absorbed in the water adsorbate layers, are more easily exchanged across the liquid/air interface when the humidity in the ambient air is high.

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“…For example, by only incorporating 0.1 wt % CNTsi nto SnO 2 ,t he most popular metal oxide gas sensing material, the sensitivity (DR/DC)t owardN O 2 increased 40-fold. [37] CNT functionalization to achieve receptor function CNT functionalization through covalent, noncovalent,a nd defect chemistry provides av ariety of chemical handleso nt he CNT sidewall and ends at which molecular receptors can be appended. [38] CNTsh ave been hybridized with inorganic compounds for av ariety of applications, including photocatalysts, supercapacitors, photonics, and chemical sensors.…”

Section: Cnt Transducersmentioning

confidence: 99%

Carbon Nanotube Based Gas Sensors toward Breath Analysis

Ellis

Star

2016

ChemPlusChem

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Breath analysis is a promising method for rapid, inexpensive, noninvasive disease diagnosis and health monitoring owing to the correlative relationship between breath biomarker concentrations and abnormal health conditions. However, current methods to identify and quantify breath components rely on large, bench‐top analytical instruments. Carbon nanotube (CNT)‐based gas sensors are desirable candidates to replace benchtop instruments because of their sensitive chemical‐to‐electrical transducer capability, high degree of chemical functionality options, and potential for miniaturization. This review seeks to give an overview of the synthetic methods used to functionalize CNT‐based gas sensors, specifically those sensors that target biologically relevant breath markers. Specific examples are provided to highlight the sensing mechanisms behind different classes of CNT hybrid composites. Finally, the current challenges and prospective solutions of applying CNT‐based sensors to breath analysis are discussed.

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A novel SnO2 gas sensor doped with carbon nanotubes operating at room temperature

Cited by 367 publications

References 29 publications

Adsorption of CO molecules on doped graphene: A first-principles study

Adsorption of CO molecules on doped graphene: A first-principles study

Effect of Water Vapor and Surface Morphology on the Low Temperature Response of Metal Oxide Semiconductor Gas Sensors

Carbon Nanotube Based Gas Sensors toward Breath Analysis

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