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

2014 ◽  
Vol 2 (27) ◽  
pp. 5280-5285 ◽  
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.

scholarly journals Ni-CNT Chemical Sensor for SF6 Decomposition Components Detection: A Combined Experimental and Theoretical Study

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3493 ◽  
Author(s):  
Yingang Gui ◽  
Xiaoxing Zhang ◽  
Peigeng Lv ◽  
Shan Wang ◽  
Chao Tang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Density Functional ◽  
Chemical Sensor ◽  
Theoretical Study ◽  
Gas Sensing ◽  
Limit Of Detection ◽  
Gas Sensitivity ◽  
Sensitivity And Selectivity ◽  
Sf6 Decomposition ◽  
Insulation Status

SF6 decomposition components detection is a key technology to evaluate and diagnose the insulation status of SF6-insulated equipment online, especially when insulation defects-induced discharge occurs in equipment. In order to detect the type and concentration of SF6 decomposition components, a Ni-modified carbon nanotube (Ni-CNT) gas sensor has been prepared to analyze its gas sensitivity and selectivity to SF6 decomposition components based on an experimental and density functional theory (DFT) theoretical study. Experimental results show that a Ni-CNT gas sensor presents an outstanding gas sensing property according to the significant change of conductivity during the gas molecule adsorption. The conductivity increases in the following order: H2S > SOF2 > SO2 > SO2F2. The limit of detection of the Ni-CNT gas sensor reaches 1 ppm. In addition, the excellent recovery property of the Ni-CNT gas sensor makes it easy to be widely used. A DFT theoretical study was applied to analyze the influence mechanism of Ni modification on SF6 decomposition components detection. In summary, the Ni-CNT gas sensor prepared in this study can be an effective way to evaluate and diagnose the insulation status of SF6-insulated equipment online.

scholarly journals Size-controlled synthesis of porous ZnSnO3 nanocubes for improving formaldehyde gas sensitivity

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20268-20277
Author(s):  
Jiaoling Zheng ◽  
Huanhuan Hou ◽  
Hao Fu ◽  
Liping Gao ◽  
Hongjie Liu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Gas Sensor ◽  
Specific Surface Area ◽  
High Sensitivity ◽  
Controlled Synthesis ◽  
Gas Sensitivity ◽  
Sensitivity And Selectivity ◽  
Size Controlled

The size of the ZnSnO3 nanocubes is about 100 nm with the corresponding specific surface area of 70.001 m2 g−1. A gas sensor based on porous ZnSnO3 nanocubes shows high sensitivity and selectivity to formaldehyde.

Preparation and Gas Sensitivity of Crown Ether Metal Complex Film Gas Sensor

2020 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
Gulgina Mamtimin ◽  
Halisa Arkin ◽  
Patima Nizamidin ◽  
Erkin Tursun ◽  
Abliz Yimit
Keyword(s):  
Crown Ether ◽  
Metal Complex ◽  
Gas Sensor ◽  
Gas Sensitivity ◽  
Complex Film

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: 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.

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

Nanomaterials ◽  
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.

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

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.

scholarly journals La2CuO4 sensing electrode configuration influence on sensitivity and selectivity for a multifunctional potentiometric gas sensor

2011 ◽  
Vol 160 (1) ◽  
pp. 957-963 ◽  
Author(s):  
Eric R. Macam ◽  
Briggs M. White ◽  
Bryan M. Blackburn ◽  
Elisabetta Di Bartolomeo ◽  
Enrico Traversa ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Electrode Configuration ◽  
Sensitivity And Selectivity

scholarly journals Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review

2018 ◽  
Vol 8 (7) ◽  
pp. 1159 ◽  
Author(s):  
Sebastiano Campisi ◽  
Carine Chan-Thaw ◽  
Alberto Villa
Keyword(s):  
Liquid Phase ◽  
Metal Nanoparticles ◽  
Electronic Properties ◽  
Functional Groups ◽  
Theoretical Models ◽  
Alcohol Oxidation ◽  
Metal Interaction ◽  
Characterization Techniques ◽  
Metal Support ◽  
Metal Support Interactions

Carbon-based materials show unique chemicophysical properties, and they have been successfully used in many catalytic processes, including the production of chemicals and energy. The introduction of heteroatoms (N, B, P, S) alters the electronic properties, often increasing the reactivity of the surface of nanocarbons. The functional groups on the carbons have been reported to be effective for anchoring metal nanoparticles. Although the interaction between functional groups and metal has been studied by various characterization techniques, theoretical models, and catalytic results, the role and nature of heteroatoms is still an object of discussion. The aim of this review is to elucidate the metal–heteroatoms interaction, providing an overview of the main experimental and theoretical outcomes about heteroatom-mediated metal–support interactions. Selected studies showing the effect of heteroatom–metal interaction in the liquid-phase alcohol oxidation will be also presented.

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

2009 ◽  
Vol 138 (1) ◽  
pp. 168-173 ◽  
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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