scholarly journals Investigation of the room temperature gas sensing properties of metal–organic charge transfer complex CuTCNQF4

2016 ◽  
Vol 4 (47) ◽  
pp. 11173-11179 ◽  
Author(s):  
Faegheh Hoshyargar ◽  
Mahnaz Shafiei ◽  
Carlo Piloto ◽  
Nunzio Motta ◽  
Anthony P. O'Mullane
Keyword(s):  
Remote Sensing ◽  
Charge Transfer ◽  
Room Temperature ◽  
Charge Transfer Complex ◽  
Gas Sensing ◽  
Significant Challenge ◽  
Sensing Applications ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Remote Sensing Applications

The ability to detect and monitor toxic and greenhouse gases is highly important, however to achieve this at room temperature and allow for remote sensing applications is a significant challenge.

scholarly journals Gas Sensing Properties of Mg-Incorporated Metal–Organic Frameworks

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3323 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Thanh-Binh Nguyen ◽  
Duy-Khoi Nguyen ◽  
Jae-Hun Kim ◽  
Jin-Young Kim ◽  
...  
Keyword(s):  
Pore Size ◽  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
Kinetic Properties ◽  
Sensing Properties ◽  
Sensing Applications ◽  
Gas Sensing Properties ◽  
Metal Organic

The gas sensing properties of two novel series of Mg-incorporated metal–organic frameworks (MOFs), termed Mg-MOFs-I and -II, were assessed. The synthesized iso-reticular type Mg-MOFs exhibited good crystallinity, high thermal stability, needle-shape morphology and high surface area (up to 2900 m2·g−1), which are promising for gas sensing applications. Gas-sensing studies of gas sensors fabricated from Mg-MOFs-II revealed better sensing performance, in terms of the sensor dynamics and sensor response, at an optimal operating temperature of 200 °C. The MOF gas sensor with a larger pore size and volume showed shorter response and recovery times, demonstrating the importance of the pore size and volume on the kinetic properties of MOF-based gas sensors. The gas-sensing results obtained in this study highlight the potential of Mg-MOFs gas sensors for the practical monitoring of toxic gases in a range of environments.

UV-Assisted Room Temperature Gas Sensing with ZnO-Ag Heterostructure Nanocrystals Studied by Photoluminescence

2021 ◽  
Vol 21 (9) ◽  
pp. 4865-4869
Author(s):  
Mei Long ◽  
Huan Yuan ◽  
Ping Sun ◽  
Lei Su ◽  
Xiangping Jiang
Keyword(s):  
Room Temperature ◽  
Doping Concentration ◽  
Gas Sensing ◽  
Polymer Network ◽  
Ag Doping ◽  
Sensing Applications ◽  
Zinc Interstitial ◽  
Metal Metal ◽  
Gas Sensing Properties ◽  
Sensing Characteristics

Noble metal-metal oxide nanohybrids play a significant contribution in gas sensing applications at room temperature. Here, Ag-loaded ZnO with different Ag doping concentration are prepared by two-step polymer-network gel method, and NO2 sensing characteristics are tested at room temperature with various concentrations. The nanocrystal sizes are found to be more uniform with increasing with Ag concentration, and photoluminescence spectroscopy further reveals the different defects in ZnO–Ag nanocrystal lattices: pure ZnO has the largest intensity of the conduction band to valence band combination, and ZnO–Ag-1 (1 mol% Ag doping concentration) has the largest oxygen vacancy content, while ZnO–Ag-3 (3 mol% Ag doping concentration) has the largest excess zinc interstitial. It is showed that the gas sensing properties are independent of the size of nanocrystals, and more dependent on the nanocrystal defect structure. In this work, a new sensing mechanism is proposed according to the experimental results.

scholarly journals Transforming Pt-SnO2 Nanoparticles into Pt-SnO2 Composite Nanoceramics for Room-Temperature Hydrogen-Sensing Applications

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2123
Author(s):  
Ming Liu ◽  
Caochuang Wang ◽  
Pengcheng Li ◽  
Liang Cheng ◽  
Yongming Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Sintering Temperature ◽  
Sno2 Nanoparticles ◽  
Hydrogen Sensing ◽  
Sensing Applications ◽  
Nanostructured Metal Oxides ◽  
Low Dimensional ◽  
Sensing Characteristics ◽  
Nanostructured Metal

Many low-dimensional nanostructured metal oxides (MOXs) with impressive room-temperature gas-sensing characteristics have been synthesized, yet transforming them into relatively robust bulk materials has been quite neglected. Pt-decorated SnO2 nanoparticles with 0.25–2.5 wt% Pt were prepared, and highly attractive room-temperature hydrogen-sensing characteristics were observed for them all through pressing them into pellets. Some pressed pellets were further sintered over a wide temperature range of 600–1200 °C. Though the room-temperature hydrogen-sensing characteristics were greatly degraded in many samples after sintering, those samples with 0.25 wt% Pt and sintered at 800 °C exhibited impressive room-temperature hydrogen-sensing characteristics comparable to those of their counterparts of as-pressed pellets. The variation of room-temperature hydrogen-sensing characteristics among the samples was explained by the facts that the connectivity between SnO2 grains increases with increasing sintering temperature, and Pt promotes oxidation of SnO2 at high temperatures. These results clearly demonstrate that some low-dimensional MOX nanocrystals can be successfully transformed into bulk MOXs with improved robustness and comparable room-temperature gas-sensing characteristics.

Sign in / Sign up

Export Citation Format

Share Document