Room temperature chemiresistive gas sensors: challenges and strategies—a mini review

Srinivasan, P. Bala; Ezhilan, Madeshwari; Kulandaisamy, Arockia Jayalatha; Babu, K. Jayanth; Rayappan, John Bosco Balaguru

doi:10.1007/s10854-019-02025-1

Cited by 79 publications

(42 citation statements)

References 176 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be explained by the nature of electrical contact between metal electrode (i.e. Pt) and sensing element [23]. The baseline resistance (two-points electrical measurement) is typically between 2 and 15 kOhms, a resistance range very applicable for sensors and much lower than the Megaohm range found for sensors with standard SWCNT [11].…”

Section: Sensor Testsmentioning

confidence: 99%

Facile Fabrication of Hybrid Carbon Nanotube Sensors by Laser Direct Transfer

Bonciu

Filipescu

Voicu

et al. 2021

Preprint

View full text Add to dashboard Cite

This paper describes a rapid, solvent-free laser based procedure for the fabrication of reproducible sensitive sensors based on hybrid nanocomposites, i.e. single walled carbon nanotubes (SWCNTs) decorated with tin oxide nanoparticles (SnO2 NP) that overcomes challenges associated with solvent-assisted chemical functionalization and integration of these materials into devices. The gas response of the LIFT-ed SWCNT: SnO2 sensors has been evaluated at room temperature and an enhanced 2 fold response to ammonia as compared to the SWCNT sensors is demonstrated. Spontaneous and full recovery of the hybrid nanocomposite signal after exposure to NH3 is achieved without any post treatment. The theoretical detection limit of the LIFT-ed SWCNT: SnO2 sensors at room temperature is calculated to be 0.59 ppb. These results indicate that LIFT is an excellent technique which shows great promise towards advancing future developments in the field of chemical sensors.

show abstract

Section: Sensor Testsmentioning

confidence: 99%

Facile Fabrication of Hybrid Carbon Nanotube Sensors by Laser Direct Transfer

Bonciu

Filipescu

Voicu

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Initially in air, upon adsorption of oxygen molecules, an electron depletion layer (EDL) for n-type materials and a hole accumulation layer (HAL) for p-type materials will be formed on the sensor's surface. When an n-type MOS is exposed to an oxidizing gas, its resistance increases while for reducing gases the resistance decreases [ 22 ]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in energy-saving chemiresistive gas sensors: A review

et al. 2021

View full text Add to dashboard Cite

With the tremendous advances in technology, gas-sensing devices are being popularly used in many distinct areas, including indoor environments, industries, aviation, and detectors for various toxic domestic gases and vapors. Even though the most popular type of gas sensor, namely, resistive-based gas sensors, have many advantages over other types of gas sensors, their high working temperatures lead to high energy consumption, thereby limiting their practical applications, especially in mobile and portable devices. As possible ways to deal with the high-power consumption of resistance-based sensors, different strategies such as self-heating, MEMS technology, and room-temperature operation using especial morphologies, have been introduced in recent years. In this review, we discuss different types of energy-saving chemisresitive gas sensors and their application in the fields of environmental monitoring. At the end, the review will be concluded by providing a summary, challenges and future perspectives.

show abstract

“…Usually, the nanostructured semiconductor needs to be thermal- or photo-activated to work properly, enabling a fast and reversible reaction between the gas target and sensing material surface [ 15 , 16 , 17 , 18 ]. Recently, the market demand for near-zero power consumption sensors, integrable in smartphones and other portable devices has driven the development of materials that work at room temperature, without any further activation [ 19 ]. For this purpose, different types of doping and functionalization have been applied to the semiconductors typically used as the sensing materials, enabling an increase of their surface reactivity and tunability of their electrical properties [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the market demand for near-zero power consumption sensors, integrable in smartphones and other portable devices has driven the development of materials that work at room temperature, without any further activation [ 19 ]. For this purpose, different types of doping and functionalization have been applied to the semiconductors typically used as the sensing materials, enabling an increase of their surface reactivity and tunability of their electrical properties [ 19 , 20 ]. Furthermore, various innovative nanostructured materials and their composites have been tested.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Low-Power Chemoresistive Gas Sensor: Predictive Thermal Modelling and Mechanical Failure Analysis

Gaiardo

Novel

Scattolo

et al. 2021

Sensors

View full text Add to dashboard Cite

The substrate plays a key role in chemoresistive gas sensors. It acts as mechanical support for the sensing material, hosts the heating element and, also, aids the sensing material in signal transduction. In recent years, a significant improvement in the substrate production process has been achieved, thanks to the advances in micro- and nanofabrication for micro-electro-mechanical system (MEMS) technologies. In addition, the use of innovative materials and smaller low-power consumption silicon microheaters led to the development of high-performance gas sensors. Various heater layouts were investigated to optimize the temperature distribution on the membrane, and a suspended membrane configuration was exploited to avoid heat loss by conduction through the silicon bulk. However, there is a lack of comprehensive studies focused on predictive models for the optimization of the thermal and mechanical properties of a microheater. In this work, three microheater layouts in three membrane sizes were developed using the microfabrication process. The performance of these devices was evaluated to predict their thermal and mechanical behaviors by using both experimental and theoretical approaches. Finally, a statistical method was employed to cross-correlate the thermal predictive model and the mechanical failure analysis, aiming at microheater design optimization for gas-sensing applications.

show abstract

Room temperature chemiresistive gas sensors: challenges and strategies—a mini review

Cited by 79 publications

References 176 publications

Facile Fabrication of Hybrid Carbon Nanotube Sensors by Laser Direct Transfer

Facile Fabrication of Hybrid Carbon Nanotube Sensors by Laser Direct Transfer

Recent advances in energy-saving chemiresistive gas sensors: A review

Optimization of a Low-Power Chemoresistive Gas Sensor: Predictive Thermal Modelling and Mechanical Failure Analysis

Contact Info

Product

Resources

About