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.

Design of SAW Specific Gas Sensor with High Sensitivity

2013 ◽  
Vol 303-306 ◽  
pp. 137-142
Author(s):  
Jin Yi Ma ◽  
Jing Yang ◽  
Bo Du ◽  
Lu Wang ◽  
Hong Min Jiang ◽  
...  
Keyword(s):  
High Temperature ◽  
Acoustic Wave ◽  
Specific Surface ◽  
Surface Area ◽  
Gas Sensor ◽  
Temperature Stability ◽  
High Sensitivity ◽  
Response Speed ◽  
High Temperature Stability ◽  
The Relationship

To improve the temperature stability, response speed and sensitivity of surface acoustic wave (SAW) gas sensor, the relationship between the sensing region of the resonator for SAW gas sensor and the sensitivity of sensor is studied, a specific resonator with big space topology structure is proposed. A SAW resonator with high temperature stability is investigated from the viewpoint of piezoelectric material, cut type and fabrication process. A nano-wire bundle based SAW gas sensor with big specific-surface-area is proposed.

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

Chemosensors ◽  
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.

scholarly journals Electrospun Nanofibers with High Specific Surface Area to Prepare Modified Electrodes for Electrochemiluminescence Detection of Azithromycin

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Hao Cheng ◽  
Xuenuan Li ◽  
Tianhao Li ◽  
Danfeng Qin ◽  
Tingfan Tang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Raw Materials ◽  
Modified Electrodes ◽  
Electrospun Nanofibers ◽  
High Sensitivity ◽  
Specific Area ◽  
High Specific Surface Area

Polyacrylonitrile (PAN) and (CH3COO)2Zn were used as raw materials, and carbon nanofibers (CNFs) with high specific surface area were successfully prepared by an electrospinning method. A new method of electrochemiluminescence detection of azithromycin was established by modifying the glassy carbon electrode (GCE). Under the optimal conditions, the electrochemical behavior and electrochemiluminescence behavior of the Ru(bpy)32+-AZM system on the modified electrode were investigated. Owing to the large specific area, more active sites, and promotion of electron transfer, the sensor exhibits high electrocatalytic activity, high sensitivity, a good linear relationship ranging from 8.0 × 10 − 8 to 1.0 × 10 − 4  mol/L, and a low detection limit ( 6.52 × 10 − 8  mol/L). In addition, the good recoveries indicate that the sensor was a promising device for the detection of azithromycin in real samples.

Flame-assisted spray pyrolysis to size-controlled LiyAlxMn2−xO4: a supervised machine learning approach

CrystEngComm ◽  
2018 ◽  
Vol 20 (46) ◽  
pp. 7590-7601 ◽  
Author(s):  
Nooshin Saadatkhah ◽  
Seyedfoad Aghamiri ◽  
Mohammad Reza Talaie ◽  
Gregory S. Patience
Keyword(s):  
Machine Learning ◽  
Specific Surface ◽  
Spray Pyrolysis ◽  
Surface Area ◽  
Specific Surface Area ◽  
Supervised Machine Learning ◽  
Learning Approach ◽  
Carbon Formation ◽  
Machine Learning Approach ◽  
Size Controlled

Flame assisted spray pyrolysis synthesizes Al-doped LiMn2O4 where Al promotes carbon formation and increases the specific surface area by 90%.

Preparation, Characterization and Oxygen Gas Sensitivity of Nanosolid Superacid SO42-/ LaCoFeO4

2011 ◽  
Vol 694 ◽  
pp. 209-213 ◽  
Author(s):  
De Juan Lin ◽  
Shui Fa Shen ◽  
Qing Hua Wang ◽  
Lin Jie Wang ◽  
Nai Sheng Chen ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photoelectron Spectroscopy ◽  
Oxygen Sensor ◽  
Water Solution ◽  
Sensor Technology ◽  
Gas Sensitivity ◽  
X Ray ◽  
Working Temperature

Metal oxides have been applied in gas sensor technology while suffering poor sensitivity and high working temperature. In this work, a novel method has been adopted to improve these problems of the sensors. A mixture of Fe3+, La3+, Co2+ (Fe3+: La3+: Co2+ =10:3:1) and dispersing agent in water solution was precipitated by adding NH4+(pH=9) under agitation. The precipitate was filtered, washed and drying, then immersed with 0.5M (NH4)2SO4 in 12hr. Superacid SO42-/ LaCoFeO4 was prepared after calcined at 673K for 1h. The thick film units for oxygen sensor were dintered at 673K for 3h.The structure of this catalyst has been characterized by means of powder X-ray diffraction (XRD), transmission electron microscope (TEM), IR, X-ray photoelectron spectroscopy (XPS) and specific surface area measurements. The result indicated that the SO42-/ LaCoFeO4 grain sizes (10nm) were smaller and the specific surface area (126M2/g ) was higher than the pure metal oxide LaCoFeO4. The acid strength was measured by the model reaction of ethyl acetate synthesis and attributed as superacid. In addition, the SO42- was combined with metal ions in a bidentate fashion. The binding energy of SO42-/ LaCoFeO4 was larger than that of LaCoFeO4. The sensitivity as well as the working temperature is improved by comparison with the pure LaCoFeO4 phase. The relationship between the oxygen sensing properties and structure has also been discussed.

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