Effect of single wall carbon nanotube networks on gas sensor response and detection limit

Kumar, Deepak; Chaturvedi, Poornendu; Saho, Praveen; Jha, Pawan Kumar; Chouksey, Abhilasha; Lal, Mohan; Rawat, J. S.; Tandon, R. P.; Chaudhury, P. K.

doi:10.1016/j.snb.2016.09.095

Cited by 102 publications

(39 citation statements)

References 54 publications

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“…Ding et al demonstrated the sensing of acetone vapors with single-wall CNTs (SWNTs), with a limit of detection (LOD) of a few parts per million (ppm) [19]. Chen et al demonstrated the sensing of nitric oxide (NO) in concentrations as low as 590 parts per quadrillion (ppq) at room temperature [16], and Kumar et al recently reported an LOD of 125 parts per trillion (ppt) for NO 2 with an SWNT sensor [21]. However, the reproducibility of CNTs with consistent properties and with performance ability that is required for sensing applications is still challenging [22].…”

Section: Introductionmentioning

confidence: 99%

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

Shalev

2017

Sensors

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The electrostatically formed nanowire (EFN) gas sensor is based on a multiple-gate field-effect transistor with a conducting nanowire, which is not defined physically; rather, the nanowire is defined electrostatically post-fabrication, by using appropriate biasing of the different surrounding gates. The EFN is fabricated by using standard silicon processing technologies with relaxed design rules and, thereby, supports the realization of a low-cost and robust gas sensor, suitable for mass production. Although the smallest lithographic definition is higher than half a micrometer, appropriate tuning of the biasing of the gates concludes a conducting channel with a tunable diameter, which can transform the conducting channel into a nanowire with a diameter smaller than 20 nm. The tunable size and shape of the nanowire elicits tunable sensing parameters, such as sensitivity, limit of detection, and dynamic range, such that a single EFN gas sensor can perform with high sensitivity and a broad dynamic range by merely changing the biasing configuration. The current work reviews the design of the EFN gas sensor, its fabrication considerations and process flow, means of electrical characterization, and preliminary sensing performance at room temperature, underlying the unique and advantageous tunable capability of the device.

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Section: Introductionmentioning

confidence: 99%

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

Shalev

2017

Sensors

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“…In the present work, we introduce an approach for gas sensing device conception that combines the benefits of individual SWCNT-FET and the increased sensitive area and channel current of SWCNT network based devices. In our approach, several individual SWCNTs are directly connected between the source and drain electrodes leading to a high increase of the device response as compared to previously reported sensors based on single tubes [17,18] or dense networks [10,19,20]. Table 1 summarizes representative works of NO2 gas sensors based on SWCNT-FET operational at room temperature and without functionalization.…”

mentioning

confidence: 99%

Ultra-sensitive NO2 gas sensors based on single-wall carbon nanotube field effect transistors: Monitoring from ppm to ppb level

Sacco

Forel

Florea

et al. 2020

Carbon

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Owing to their sensitive chemical-to-electrical transducer capabilities and compatibility with deviee miniaturization and low operation temperature, single-walled carbon nanotube field-effect transistor (SWCNT-FET) represents an attractive platform to provide solutions in the gas sensing field. In this work, SWCNT-FETs were fabricated and their performances for detecting low NO2 concentrations were evaluated. Outstanding deviees response was obtained, which was shown to follow a 2 power law dependence between the response and the NOz concentration in the range of 100 ppb up to 10 ppm. Such ultra-high response is attributed to an enhancement of the Schottky barrier modulation triggered by the specifie deviee configuration. The deviee configuration is based on individual semiconducting SWCNTs directly connecting the interdigitated Source-Drain electrodes. To the best of our knowledge, the results reported here correspond to the most sensitive deviee among the deviees based on non-functionalized carbon materials and operational at low temperatures. Furthermore, the obtained results are supported by a deep SWCNT characterization, and the changes in Schottky barrier's height induced by the,presence of gas molecules are estimated and discussed. Overall, the present reported results provide useful information for establishing a robust process for the fabrication of the next generation of CNT based gas-sensing devices.

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“…In accordance with the expected behavior, it can be seen from the results (Figure 4a) that the presence of oxygen causes an increase of the baseline conductance. It must be noted that the effect is minor, showing a limited influence of oxygen adsorption on the electronic conduction, despite the significant adsorption energy for oxygen and large charge transfer predicted by some studies [38].…”

Section: Study Of the Baseline Conductancementioning

confidence: 84%

Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

Fort

Panzardi

Al‐Hamry

et al. 2019

Sensors

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The aim of this work is to investigate the gas sensing performance of single wall carbon nanotubes (SWCNTs)-based conductive sensors operating at low-medium temperatures (<250 • C). The investigated sensing films consists of an SWCNT network obtained by drop-casting a SWCNT suspension. Starting from this base preparation, different sensing devices were obtained by decorating the SWCNT network with materials suitable for enhancing the sensitivity toward the target gas. In particular, in this paper, nano-particles of gold and of TiO 2 were used. In the paper, the performance of the different sensing devices, in terms of response time, sensitivity toward NO 2 and cross-sensitivity to O 2 , CO and water vapor, were assessed and discussed. Sensors based on decorated SWCNT films showed high performance; in particular, the decoration with Au nano-particles allows for a large enhancement of sensitivity (reaching 10%/1 ppm at 240 • C) and a large reduction of response time. On the other hand, the addition of TiO 2 nanoparticles leads to a satisfactory improvement of the sensitivity as well as a significant reduction of the response time at moderate temperatures (down to 200 • C). Finally, the suitability of using Au decorated SWCNTs-based sensors for room temperature sensing is demonstrated.

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Effect of single wall carbon nanotube networks on gas sensor response and detection limit

Cited by 102 publications

References 54 publications

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

The Electrostatically Formed Nanowire: A Novel Platform for Gas-Sensing Applications

Ultra-sensitive NO2 gas sensors based on single-wall carbon nanotube field effect transistors: Monitoring from ppm to ppb level

Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

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