scholarly journals MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1059 ◽  
Author(s):  
Yanlin Zhang ◽  
Chaowei Jia ◽  
Qiuyue Wang ◽  
Quan Kong ◽  
Gang Chen ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Metal Organic Framework ◽  
Fast Response ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Response And Recovery ◽  
Nife2o4 Nanoparticles ◽  
Gas Molecules ◽  
Ppm Level

Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.

Improved gas sensing properties of silver-functionalized ZnSnO3 hollow nanocubes

2018 ◽  
Vol 5 (9) ◽  
pp. 2123-2131 ◽  
Author(s):  
YanYang Yin ◽  
Feng Li ◽  
Nan Zhang ◽  
Shengping Ruan ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Fast Response ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Porous Silver ◽  
Acetone Detection

Porous silver-functionalized ZnSnO3 hollow nanocubes as a gas sensor with an ultra-fast response and recovery speed for acetone detection.

scholarly journals Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3829 ◽  
Author(s):  
Hongxiang Xu ◽  
Junhua Xu ◽  
Junlin Wei ◽  
Yamei Zhang
Keyword(s):  
Gas Sensing ◽  
Fast Response ◽  
Gas Detection ◽  
Detection Range ◽  
Sensing Properties ◽  
Working Temperature ◽  
Sensing Material ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Optimum Working

BiFeO3 nanocrystals were applied as the sensing material to isopropanol. The isopropanol sensor based on BiFeO3 nanocrystals shows excellent gas-sensing properties at the optimum working temperature of 240 °C. The sensitivity of as-prepared sensor to 100 ppm isopropanol is 31 and its response and recovery time is as fast as 6 and 17 s. The logarithmic curves of the sensitivity and concentration of BiFeO3 sensors are a very good linear in the low detection range of 2–100 ppm. In addition, the gas sensing mechanism is also discussed. The results suggest that the BiFeO3 nanomaterial can be potentially applied in isopropanol gas detection.

MOF-templated controllable synthesis of α-Fe2O3 porous nanorods and their gas sensing properties

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 94699-94705 ◽  
Author(s):  
Pingyi Gao ◽  
Rong Liu ◽  
Huihan Huang ◽  
Xiao Jia ◽  
Haibo Pan
Keyword(s):  
Gas Sensing ◽  
Metal Organic Framework ◽  
Controllable Synthesis ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Organic Framework

α-Fe2O3 porous nanorods (PNRs) with controlled morphologies were simply synthesized by thermolysis of Fe-based metal–organic framework (MIL-88A) at 500 °C.

Hierarchical hollow ZnO cubes constructed using self-sacrificial ZIF-8 frameworks and their enhanced benzene gas-sensing properties

2015 ◽  
Vol 39 (9) ◽  
pp. 7060-7065 ◽  
Author(s):  
Wenhui Li ◽  
Xiaofeng Wu ◽  
Haidi Liu ◽  
Jiayuan Chen ◽  
Wenxiang Tang ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Metal Organic Frameworks ◽  
Chemical Sensitivity ◽  
Sensing Properties ◽  
Low Concentration ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Gaseous Benzene

Hierarchical ZnO hollow cubes constructed using Zn-based metal–organic frameworks enhance significantly chemical sensitivity towards low-concentration gaseous benzene.

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.

A Formaldehyde Gas Sensor Based on Zinc Doped Lanthanum Ferrite

2013 ◽  
Vol 873 ◽  
pp. 304-310 ◽  
Author(s):  
Jin Zhang ◽  
Yu Min Zhang ◽  
Chang Yi Hu ◽  
Zhong Qi Zhu ◽  
Qing Ju Liu
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Lanthanum Ferrite ◽  
Gas Sensing Properties ◽  
Recovery Times ◽  
Response And Recovery ◽  
Sensing Characteristics

The gas-sensing properties of zinc doped lanthanum ferrite (Zn-LaFeO3) compounds for formaldehyde were investigated in this paper. Zn-LaFeO3 powders were prepared using sol-gel method combined with microwave chemical synthesis. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formaldehyde gas-sensing characteristics for the sample were examined. The experimental results indicate that the sensor based on the sample Zn-LaFeO3 shows excellent gas-sensing properties to formaldehyde gas. At the optimal operating temperature of 250°C, the sensitivity of the sensor based on LaFe0.7Zn0.3O3 to 100ppm formaldehyde is 38, while to other test gases, the sensitivity is all lower than 20. The response and recovery times for the sample to formaldehyde gas are 100s and 100s, respectively.

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