2D/2D/2D Ti3C2Tx@TiO2@MoS2 Heterostructure as Ultrafast and High-sensitivity NO2 Gas Sensor at Room-temperature

The very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing application that provide new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure...

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Sensing of NO, NO2, and SO2 on two dimensional WS2 doped with Al, P, and Fe: An ab initio study

10.21203/rs.2.22795/v1 ◽

2020 ◽

Author(s):

jiamu cao ◽

jing zhou ◽

jianing shi ◽

yufeng zhang ◽

junyu chen ◽

...

Keyword(s):

Gas Sensor ◽

Gas Sensors ◽

High Performance ◽

Density Functional ◽

Gas Sensing ◽

Molecular Model ◽

2D Materials ◽

State Density ◽

Two Dimensional ◽

Gas Molecules

Abstract Owing to their harmful and polluting the environment, nitrogen oxides and sulfur dioxide are expected to monitor when they are used. However, the widespread use of gas sensing methods presents obstacles in terms of portability or stability. Hence, a better detect way needs to be found urgently. The success of graphene-based gas sensors has stimulated interest in two-dimensional (2D) materials in the gas sensing area. Transition metal dichalcogenides (TMDs), such as MoS2 or WS2, are considered to have the high-performance potential for gas sensors. Unfortunately, when used as a gas sensor, the sensing response of the pristine TMDs is greatly affected by a number of gas molecules that are too weak to be detected. Herein, to evaluate the sensing capability of Al, P, and Fe-doped WS2 to NO, NO2, and SO2, the molecular model of the adsorption systems was constructed, and density functional theory (DFT) was used to calculate the adsorption behavior of these gases. The binding force of all the doped-WS2 to the harmful gas molecules is much stronger than that of the pristine WS2. According to the results of adsorption energy, band structure, and state density, Al-doped WS2 has the potential to be used as NO and SO2 gas sensor, while P-doped WS2 is selective to NO. This work opens up a new reference for choosing appropriate doping types on 2D materials for noxious gas sensing.

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MXene/WS2 2D/2D hybrid films for visible-light-activated NO2 sensing at room temperature

Chemical Communications ◽

10.1039/d1cc03474j ◽

2021 ◽

Author(s):

Yi Xia ◽

Sufang He ◽

Mingjun Wang ◽

Liexing Zhou ◽

Jing Wang ◽

...

Keyword(s):

Visible Light ◽

Gas Sensors ◽

Room Temperature ◽

2D Materials ◽

Two Dimensional ◽

Hybrid Films

OPTOELECTRONIC GAS SENSORS BASED ON TWO-DIMENSIONAL (2D) MATERIALS ARE TOUTED AS POTENTIAL CANDIDATES FOR NO2 SENSING AT ROOM TEMPERATURE. HOWEVER, MOST OF THE DEVELOPED OPTOELECTRONIC SENSORS TO DATE ARE CONFINED...

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A Novel Type Room Temperature Surface Photovoltage Gas Sensor Device

10.20944/preprints201807.0572.v1 ◽

2018 ◽

Author(s):

Monika Kwoka ◽

Michal A. Borysiewicz ◽

Pawel Tomkiewicz ◽

Anna Piotrowska ◽

Jacek Szuber

Keyword(s):

Gas Sensor ◽

Room Temperature ◽

Gas Sensing ◽

Signal To Noise Ratio ◽

High Sensitivity ◽

Fast Response ◽

Surface Photovoltage ◽

Kelvin Probe ◽

Sensor Device ◽

Developed Surface

In this paper a novel type of a highly sensitive gas sensor device based on the surface photovoltage effect is described. The developed surface photovoltage gas sensor is based on a reverse Kelvin probe approach. As the active gas sensing electrode the porous ZnO nanostructured thin films are used deposited by the direct current (DC) reactive magnetron sputtering method exhibiting the nanocoral surface morphology combined with an evident surface nonstoichiometry related to the unintentional surface carbon and water vapor contaminations. Among others, the demonstrated SPV gas sensor device exhibits a high sensitivity of 1 ppm to NO2 with a signal to noise ratio of about 50 and a fast response time of several seconds under the room temperature conditions.

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Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

Journal of Nanomaterials ◽

10.1155/2014/497384 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 40

Author(s):

Sweejiang Yoo ◽

Xin Li ◽

Yuan Wu ◽

Weihua Liu ◽

Xiaoli Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Gas Sensor ◽

Tannic Acid ◽

Room Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Gas Detection ◽

Ammonia Gas ◽

Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

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TWO-DIMENSIONAL NANOSHEETS-ASSEMBLED FLOWER-LIKE Co3O4 MICROSPHERES AND THEIR GAS SENSING PERFORMANCES

NANO ◽

10.1142/s1793292014500714 ◽

2014 ◽

Vol 09 (07) ◽

pp. 1450071 ◽

Cited By ~ 7

Author(s):

HONGWEI CHE ◽

AIFENG LIU ◽

XIAOLIANG ZHANG ◽

JUNXIAN HOU ◽

JINGBO MU ◽

...

Keyword(s):

Ethylene Glycol ◽

Gas Sensor ◽

Gas Sensors ◽

Gas Sensing ◽

Solvothermal Method ◽

Three Dimensional ◽

Hexadecyltrimethylammonium Bromide ◽

Two Dimensional ◽

2D Nanosheets ◽

Co3o4 Microspheres

In this paper, three-dimensional (3D) Co 3 O 4 flower-like microspheres have been successfully synthesized via a facile ethylene glycol (EG)-mediated solvothermal method followed by calcination. The as-prepared flower-like precursors microspheres are formed from the assembly of 2D nanosheets in the presence of hexadecyltrimethylammonium bromide (CTAB). The flower-like architectures of the prepared precursors could be tailored by changing the amount of CTAB. Furthermore, when evaluated as a gas sensor, the obtained Co 3 O 4 flower-like microspheres exhibit a good response and sensitivity toward ethanol gas, suggesting their promising potential for gas sensors application.

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Preparation and Application of 2D MXene-Based Gas Sensors: A Review

Chemosensors ◽

10.3390/chemosensors9080225 ◽

2021 ◽

Vol 9 (8) ◽

pp. 225

Author(s):

Qingting Li ◽

Yanqiong Li ◽

Wen Zeng

Keyword(s):

Composite Materials ◽

Specific Surface ◽

Surface Area ◽

Gas Sensor ◽

Specific Surface Area ◽

Gas Sensors ◽

Room Temperature ◽

Gas Sensing ◽

Interlayer Spacing ◽

Preparation Methods

Since MXene (a two-dimensional material) was discovered in 2011, it has been favored in all aspects due to its rich surface functional groups, large specific surface area, high conductivity, large porosity, rich organic bonds, and high hydrophilicity. In this paper, the preparation of MXene is introduced first. HF etching was the first etching method for MXene; however, HF is corrosive, resulting in the development of the in situ HF method (fluoride + HCl). Due to the harmful effects of fluorine terminal on the performance of MXene, a fluorine-free preparation method was developed. The increase in interlayer spacing brought about by adding an intercalator can affect MXene’s performance. The usual preparation methods render MXene inevitably agglomerate and the resulting yields are insufficient. Many new preparation methods were researched in order to solve the problems of agglomeration and yield. Secondly, the application of MXene-based materials in gas sensors was discussed. MXene is often regarded as a flexible gas sensor, and the detection of ppb-level acetone at room temperature was observed for the first time. After the formation of composite materials, the increasing interlayer spacing and the specific surface area increased the number of active sites of gas adsorption and the gas sensitivity performance improved. Moreover, this paper discusses the gas-sensing mechanism of MXene. The gas-sensing mechanism of metallic MXene is affected by the expansion of the lamellae and will be doped with H2O and oxygen during the etching process in order to become a p-type semiconductor. A p-n heterojunction and a Schottky barrier forms due to combinations with other semiconductors; thus, the gas sensitivities of composite materials are regulated and controlled by them. Although there are only several reports on the application of MXene materials to gas sensors, MXene and its composite materials are expected to become materials that can effectively detect gases at room temperature, especially for the detection of NH3 and VOC gas. Finally, the challenges and opportunities of MXene as a gas sensor are discussed.

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Fabrication of Room Temperature Resistive Ethanol Gas Sensor Based on ZnO Nanorods Decorated with PbS Nanoparticles

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.65.145 ◽

2020 ◽

Vol 65 ◽

pp. 145-155

Author(s):

Hadi Riyahi Madvar ◽

Zoheir Kordrostami ◽

Samaneh Hamedi

Keyword(s):

Gas Sensor ◽

Room Temperature ◽

Printed Circuit Board ◽

Gas Sensing ◽

Zno Nanorods ◽

Test Chamber ◽

High Sensitivity ◽

Circuit Board ◽

Sensitive Material ◽

Pbs Nanoparticles

A resistive ethanol gas sensor with a high sensitivity has been proposed. The fabricated gas sensor has a very promising response and recovery at room temperature. The proposed sensor has been fabricated by depositing sensitive nanostructured material on printed circuit board interdigitated electrodes. As the sensitive material, ZnO nanorods of high uniformity have been synthesized by hydrothermal method and then decorated by PbS nanoparticles. The synthesized decorated nanorods were characterized by X-ray diffraction and scanning electron microscope which confirmed the formation of the desired nanostructures. The ethanol gas sensing properties of the ZnO nanorods decorated with PdS nanoparticles was measured in a test chamber. The minimum ethanol concentration detected by the sensor has been 10 ppm. The results showed the higher sensitivity of the proposed sensor to the ethanol at room temperature compared to similar works.

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Nanomaterial gas sensors for biosensing applications: A Review

Recent Patents on Nanotechnology ◽

10.2174/1872210515666211129115229 ◽

2021 ◽

Vol 15 ◽

Author(s):

Kurmendra

Keyword(s):

Gas Sensor ◽

Crystalline Structure ◽

Gas Sensors ◽

Gas Sensing ◽

Review Article ◽

Morphological Properties ◽

Future Research ◽

Sensing Application ◽

Detection Of Biomolecules ◽

2D And 3D

Background: Nanomaterial is one of the most used materials for various gas sensing application to detect toxic gases, human breath, and other specific gas sensing. One of the most important applications of nanomaterial based gas sensors is as biosensing applications. In this review article, the gas sensors for biosensing are discussed by classifying gas sensors on the basis of crystalline structure and different categories of nanomaterial. Methods: In this paper, firstly rigorous efforts has been made to find out research questions by going through structured and systematic survey of available peer reviewed high quality articles in this field. The papers related to nanomaterial based biosensors are then reviewed qualitatively to provide substantive findings from the recent developments in this field. Results: In this review article, firstly classifications of nanomaterial gas sensors have been presented on the basis of crystalline structure of nanomaterial and different types of nanomaterial available for biosensing applications. Further, the gas sensors based on nanomaterial for biosensing applications are collected and reviewed in terms of their performance parameters such as sensing material used, target gas component, detection ranges (ppm-ppb), response time, operating temperature and method of detection etc. The different nanomaterials possess slightly different sensing and morphological properties due to their structure, therefore, it can be said that a nanomaterial must be selected carefully for particular application. The 1D nanomaterials show best selectivity and sensitivity for gases available in low concentration ranges due to their miniaturised structure as compared to 2D and 3D nanomaterials. However, these 2D and 3D nanomaterials also so good sensing properties compared to bulk semiconductor materials. The polymer and nanocomposites have opened door for future research and have great potential for new generation gas sensor for detecting biomolecules. Conclusion: These nanomaterials extend great properties towards sensing application of different gases for lower concentration of particular gas particles. Nano polymer and nano composites have great potential to be used gas sensor for detection of biomolecules.

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Ultraviolet Photoactivated Room Temperature NO2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO2 Nanoparticles

Nanomaterials ◽

10.3390/nano10030462 ◽

2020 ◽

Vol 10 (3) ◽

pp. 462 ◽

Cited By ~ 2

Author(s):

Hee-Jung Choi ◽

Soon-Hwan Kwon ◽

Won-Seok Lee ◽

Kwang-Gyun Im ◽

Tae-Hyun Kim ◽

...

Keyword(s):

Metal Oxide ◽

Tio2 Nanoparticles ◽

Gas Sensor ◽

Gas Sensors ◽

Room Temperature ◽

Prolonged Exposure ◽

Volume Ratio ◽

High Sensitivity ◽

Detection Property ◽

No2 Gas Sensors

Prolonged exposure to NO2 can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials. In particular, the different morphologies of ZnO-based nanostructures significantly affect the detection property of NO2 gas sensors. However, because of the large interaction energy of chemisorption (1–10 eV), metal oxide-based gas sensors are typically operated above 100 °C, overcoming the energy limits to attain high sensitivity and fast reaction. High operating temperature negatively affects the reliability and durability of semiconductor-based sensors; at high temperature, the diffusion and sintering effects at the metal oxide grain boundaries are major factors causing undesirable long-term drift problems and preventing stability improvements. Therefore, we demonstrate NO2 gas sensors consisting of ZnO hemitubes (HTs) and nanotubes (NTs) covered with TiO2 nanoparticles (NPs). To operate the gas sensor at room temperature (RT), we measured the gas-sensing properties with ultraviolet illumination onto the active region of the gas sensor for photoactivation instead of conventional thermal activation by heating. The performance of these gas sensors was enhanced by the change of barrier potential at the ZnO/TiO2 interfaces, and their depletion layer was expanded by the NPs formation. The gas sensor based on ZnO HTs showed 1.2 times higher detection property than those consisting of ZnO NTs at the 25 ppm NO2 gas.

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