A wafer-level liquid cavity integrated amperometric gas sensor with ppb-level nitric oxide gas sensitivity

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

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The Adsorption and Sensing Performances of Ir-modified MoS2 Monolayer toward SF6 Decomposition Products: A DFT Study

Nanomaterials ◽

10.3390/nano11010100 ◽

2021 ◽

Vol 11 (1) ◽

pp. 100

Author(s):

Hongcheng Liu ◽

Feipeng Wang ◽

Kelin Hu ◽

Tao Li ◽

Yuyang Yan ◽

...

Keyword(s):

Gas Sensor ◽

Density Functional ◽

Gas Adsorption ◽

Dft Method ◽

Orbital Theory ◽

Gas Sensitivity ◽

Decomposition Products ◽

Mos2 Monolayer ◽

Characteristic Decomposition ◽

Sensing Material

In this paper, the Ir-modified MoS2 monolayer is suggested as a novel gas sensor alternative for detecting the characteristic decomposition products of SF6, including H2S, SO2, and SOF2. The corresponding adsorption properties and sensing behaviors were systematically studied using the density functional theory (DFT) method. The theoretical calculation indicates that Ir modification can enhance the surface activity and improve the conductivity of the intrinsic MoS2. The physical structure formation, the density of states (DOS), deformation charge density (DCD), molecular orbital theory analysis, and work function (WF) were used to reveal the gas adsorption and sensing mechanism. These analyses demonstrated that the Ir-modified MoS2 monolayer used as sensing material displays high sensitivity to the target gases, especially for H2S gas. The gas sensitivity order and the recovery time of the sensing material to decomposition products were reasonably predicted. This contribution indicates the theoretical possibility of developing Ir-modified MoS2 as a gas sensor to detect characteristic decomposition gases of SF6.

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A facile method for preparation of porous nitrogen-doped Ti Ti3C2Tx MXene for highly responsive acetone detection at high temperature

Functional Materials Letters ◽

10.1142/s1793604721510437 ◽

2021 ◽

pp. 2151043

Author(s):

Zijing Wang ◽

Fen Wang ◽

Angga Hermawan ◽

Jianfeng Zhu ◽

Shu Yin

Keyword(s):

Gas Sensor ◽

Recovery Time ◽

Gas Sensing ◽

Three Dimensional ◽

Gas Sensitivity ◽

Nitrogen Doped ◽

Dimensional Network ◽

Potential Applications ◽

Response And Recovery ◽

Acetone Detection

Porous nitrogen-doped Ti3C2T[Formula: see text] MXene (N-TCT) with a three-dimensional network structure is synthesized via a simple sacrifice template method and then utilized as an acetone gas sensor. By introducing nitrogen atoms as heteroatoms into Ti3C2T[Formula: see text] nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti3C2T[Formula: see text] Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 ([Formula: see text]/[Formula: see text] × 100%) and excellent recovery time (9s) at 150[Formula: see text]C. Compared with the pure Ti3C2T[Formula: see text]-based gas sensor (381/92s), the response and recovery time are both obviously improved, and the response value increased by 3.5 times. The gas-sensing mechanism of the porous N-TCT is also discussed in detail. Based on the excellent gas sensitivity of porous N-TCT for highly responsive acetone detection at high temperatures, the strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials to realize their potential applications.

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On-chip fabrication of ZnO-nanowire gas sensor with high gas sensitivity

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2009.02.008 ◽

2009 ◽

Vol 138 (1) ◽

pp. 168-173 ◽

Cited By ~ 236

Author(s):

M.-W. Ahn ◽

K.-S. Park ◽

J.-H. Heo ◽

D.-W. Kim ◽

K.J. Choi ◽

...

Keyword(s):

Gas Sensor ◽

Zno Nanowire ◽

Gas Sensitivity ◽

Chip Fabrication ◽

On Chip

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Chemically synthesized PbS Nano particulate thin films for a rapid NO2 gas sensor

Materials Science-Poland ◽

10.1515/msp-2016-0001 ◽

2016 ◽

Vol 34 (1) ◽

pp. 204-211 ◽

Cited By ~ 20

Author(s):

Vishal V. Burungale ◽

Rupesh S. Devan ◽

Sachin A. Pawar ◽

Namdev S. Harale ◽

Vithoba L. Patil ◽

...

Keyword(s):

Thin Films ◽

Gas Sensor ◽

Gas Sensing ◽

Operating Temperature ◽

Morphological Properties ◽

X Ray Diffraction ◽

Gas Sensitivity ◽

Silar Method ◽

Layer Adsorption ◽

Gas Sensing Properties

AbstractRapid NO2 gas sensor has been developed based on PbS nanoparticulate thin films synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method at different precursor concentrations. The structural and morphological properties were investigated by means of X-ray diffraction and field emission scanning electron microscope. NO2 gas sensing properties of PbS thin films deposited at different concentrations were tested. PbS film with 0.25 M precursor concentration showed the highest sensitivity. In order to optimize the operating temperature, the sensitivity of the sensor to 50 ppm NO2 gas was measured at different operating temperatures, from 50 to 200 °C. The gas sensitivity increased with an increase in operating temperature and achieved the maximum value at 150 °C, followed by a decrease in sensitivity with further increase of the operating temperature. The sensitivity was about 35 % for 50 ppm NO2 at 150 °C with rapid response time of 6 s. T90 and T10 recovery time was 97 s at this gas concentration.

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A low-cost nitric oxide gas sensor based on bonded gold wires

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) ◽

10.1109/transducers.2017.7994334 ◽

2017 ◽

Cited By ~ 1

Author(s):

Stephan Schroder ◽

Hithesh K. Gatty ◽

Goran Stemme ◽

Nielas Roxhed ◽

Frank Niklaus

Keyword(s):

Nitric Oxide ◽

Gas Sensor ◽

Low Cost ◽

Gold Wires

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Graphene-based gas sensor: metal decoration effect and application to a flexible device

Journal of Materials Chemistry C ◽

10.1039/c4tc00510d ◽

2014 ◽

Vol 2 (27) ◽

pp. 5280-5285 ◽

Cited By ~ 133

Author(s):

Byungjin Cho ◽

Jongwon Yoon ◽

Myung Gwan Hahm ◽

Dong-Ho Kim ◽

Ah Ra Kim ◽

...

Keyword(s):

Metal Nanoparticles ◽

Electronic Properties ◽

Gas Sensor ◽

Gas Sensitivity ◽

Flexible Device ◽

Sensitivity And Selectivity ◽

Metal Decoration ◽

Synergistic Combination

Synergistic combination of metal nanoparticles and graphene modulates electronic properties of graphene, leading to enhancement in gas sensitivity and selectivity.

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