A Room Temperature Gas Sensor Based on Sulfonated SWCNTs for the Detection of NO and NO2

Ionete, Eusebiu Ilarian; Spiridon, Stefan Ionut; Monea, Bogdan Florian; Elena, Stratulat

doi:10.3390/s19051116

Cited by 20 publications

(6 citation statements)

References 30 publications

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“…To this aim, we consider that the sensors are used in air, therefore, in the presence of oxygen. Since there are many research studies showing that both oxygen and NO 2 can be adsorbed on SWCNTs [ 33 , 34 , 35 ], we consider the following surface reactions [ 36 , 37 ]:

and:

where S is an adsorption site whereas k Y and k i Y indicate the adsorption/desorption rate constants for the species Y . Moreover, we assume for all the reaction rate constants an Arrhenius form of the type:

…”

Section: Model Derivationmentioning

confidence: 99%

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NO2 Sensing with SWCNT Decorated by Nanoparticles in Temperature Pulsed Mode: Modeling and Characterization

Panzardi

Grasso

Vignoli

et al. 2020

Sensors

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In this paper, NO2 sensing by means of single-wall carbon nanotubes (SWCNT) networks, decorated with nanoparticles of TiO2 and Au, is proposed. In particular, it is shown that the performance of these materials can be enhanced using pulsed temperature mode. This sensing strategy effectiveness is theoretically and experimentally assessed. In this paper, in fact, a dynamic model for conductive gas sensors formed by networks of nanowires, considering the junctions between different wires as the main contribution to sensor conductance, and in the presence of the target gas, is presented and validated. The model accounts for variable temperature and gas concentration and sheds some light on the mechanisms leading to the sensor response improvement related to temperature pulsed working mode. It is also shown how the addition of a different material can be modeled through different surface adsorption kinetics.

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and:

…”

Section: Model Derivationmentioning

confidence: 99%

“…To this aim, we consider that the sensors are used in air, therefore, in the presence of oxygen. Since there are many research studies showing that both oxygen and NO 2 can be adsorbed on SWCNTs [33][34][35], we consider the following surface reactions [36,37]:…”

Section: Model Derivationmentioning

confidence: 99%

NO2 Sensing with SWCNT Decorated by Nanoparticles in Temperature Pulsed Mode: Modeling and Characterization

Panzardi

Grasso

Vignoli

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…The superior thermal, electrical, and mechanical properties of CNTs [4,5,6] have enabled the development of new types of sensors that use CNTs as a sensing element (temperature, pressure, humidity, gas, and electrochemical biosensors) [7,8,9,10,11] that can be used for many applications (biomedicine, automotive, food industry, environmental monitoring, agriculture, manufacturing industry, security, etc.) [12].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes and Carbon Nanotube Structures Used for Temperature Measurement

Monea

Ionete

Spiridon

et al. 2019

Sensors

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Accurate measurement of temperatures with low power consumption with the highest sensitivity and smallest possible elements is still a challenge. The thermal, electrical, and mechanical properties of carbon nanotubes (CNTs) have suggested that their use as a very sensitive sensing element will allow the creation of different sensors, far superior to other devices of similar size. In this paper, we present a short review of different constructive designs of CNTs based resistive sensors used for temperature measurement, available in literature, assembled using different processes, such as self-assembly, drop-casting from a solution, thin films obtained by gluing, printing, spraying, or filtration over a special membrane. As particular cases, temperature sensors obtained from CNT-polymer nanocomposite structures, CNTs filled with uniformly dispersed Fe3O4 nanoparticles or with gallium, and carbon nanotube wires (CNWs) hybrids are presented. Using these preparation procedures, mixtures of CNTs with different dimensions and chirality, as well as with a variable level of impurities and structural defects, can be produced. The sensors’ performance charts are presented, highlighting a number of aspects regarding the applicability of CNT structures for temperature measurement ranging from cryogenic temperatures to high temperatures, the limitations they have, their characteristics and advantages, as well as the special situations that may arise given the particular structure of these new types of materials, together with basic relationships and parameters for CNTs characterization. Further research will be required to develop the techniques of manipulating and depositing individual CNTs on supports and electrodes for the development of temperature sensors.

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“…Sulfonated SWCNTs were used to detect NO and NO 2 at RT. [ 133 ] The sensors exhibited high sensitivity to NO and NO 2 in the concentration range of 40–800 ppb. After attaching sulfonic group –SO 3 H on the surface of SWCNTs, the electron rich sites that are from the lone pair of electrons of S or O atoms in –SO 3 H, can adsorb the electron‐withdrawing oxidizing molecules (NO and NO 2 ).…”

Section: Materials For Gas Sensingmentioning

confidence: 99%

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

2021

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Along with the progress of nanoscience and nanotechnology, nanomaterials with attractive structural and functional properties have gained more attention than ever before, especially in the field of electronic sensors. In recent years, the gas sensing devices have made great achievement and also created wide application prospects, which leads to a new wave of research for designing advanced sensing materials. There is no doubt that the characteristics are highly governed by the sensitive layers. For this reason, important advances for the outstanding, novel sensing materials with different dimensional structures including 0D, 1D, 2D, and 3D are reported and summarized systematically. The sensing materials cover noble metals, metal oxide semiconductors, carbon nanomaterials, metal dichalcogenides, g‐C3N4, MXenes, and complex composites. Discussion is also extended to the relation between sensing performances and their structure, electronic properties, and surface chemistry. In addition, some gas sensing related applications are also highlighted, including environment monitoring, breath analysis, food quality and safety, and flexible wearable electronics, from current situation and the facing challenges to the future research perspectives.

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A Room Temperature Gas Sensor Based on Sulfonated SWCNTs for the Detection of NO and NO2

Cited by 20 publications

References 30 publications

NO2 Sensing with SWCNT Decorated by Nanoparticles in Temperature Pulsed Mode: Modeling and Characterization

NO2 Sensing with SWCNT Decorated by Nanoparticles in Temperature Pulsed Mode: Modeling and Characterization

Carbon Nanotubes and Carbon Nanotube Structures Used for Temperature Measurement

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

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