scholarly journals 2D SnS2—A Material for Impedance-Based Low Temperature NOx Sensing?

Proceedings ◽  
2017 ◽  
Vol 1 (4) ◽  
pp. 455
Author(s):  
Daniela Schönauer-Kamin ◽  
Yongxiang Li ◽  
Wojtek Wlodarski ◽  
Samuel Ippolito ◽  
Ralf Moos
Keyword(s):  
Low Temperature ◽  
Operating Temperature ◽  
Total Concentration ◽  
Group Iv ◽  
Sensor Response ◽  
Two Dimensional ◽  
Sensor Signal ◽  
Tin Disulfide ◽  
Conductometric Transducer ◽  
Ppm Level

The sensor signal of tin disulfide (SnS2), a two-dimensional (2D) group-IV dichalcogenide, deposited as a film on a conductometric transducer is investigated at 130 °C. The focus is on the detection of the total NOx concentration. Therefore, the sensor response to NO and NO2 at ppm- and sub-ppm level at low operating temperature is determined. The results show that the sensing device provides a high sensor signal to NO and NO2 even at concentrations of only 390 ppb NOx. Both nitrous components, NO and NO2, yield the same signal, which offers the opportunity to sense the total concentration of NOx.

Synthesis, Structural and Gas Sensing Characterization of W-Doped SnO2 Nanostructures

2017 ◽  
Vol 381 ◽  
pp. 15-19 ◽  
Author(s):  
Mukesh Chander Bhatnagar ◽  
Anima Johari
Keyword(s):  
Low Temperature ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Environmental Pollutants ◽  
Sensor Response ◽  
Gas Content ◽  
Temperature Sensitive ◽  
Oxide Material ◽  
Industry Waste

Tin oxide material has been extensively used for gas sensing application. Due to high operating temperature of metal oxide gas sensors, around 600 K and long term instability, research has been carried out to improve the material properties and reducing operating temperature. nanostructure materials have shown higher sensitivity and better stability towards gas environment. Air pollutants from automobiles and industry waste are the primary sources of environmental pollutants and there is need to develop low temperature, sensitive and selective gas sensors to monitor the gas content. In this paper, we have discussed the effect of Tungsten (W) doping in SnO2 nanostructures on the structural and gas sensing properties. The nanostructures have been synthesized by thermal evaporation process. The structural and surface morphology studies confirm the growth of nanowires on silicon substrates. The corresponding EDX spectra also confirm the doping of W into SnO2 nanowires. The gas sensor response of W-doped SnO2 nanowires was investigated upon exposure to various gases. It has been observed that doping of W enhances the NO2 sensitivity of nanowire based sensors at low temperature and the sensor response improves with increase in gas concentration.

scholarly journals Crystalline WO3 nanoparticles for No2 sensing

2020 ◽  
Vol 14 (4) ◽  
pp. 282-292
Author(s):  
Branko Matovic ◽  
Jelena Lukovic ◽  
Dejan Zagorac ◽  
Olga Ivanova ◽  
Alexander Baranchikov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Tungsten Oxide ◽  
Room Temperature ◽  
Sensor Response ◽  
Literature Survey ◽  
Oxide Nanoparticles ◽  
Sensor Signal ◽  
Sensor Properties ◽  
Tungsten Oxide Nanoparticles

This study shows excellent NO2-sensing properties of tungsten oxide nanoparticles, prepared using a facile procedure which includes dissolution of metallic tungsten in hydrogen peroxide with subsequent low-temperature (400 ?C) heating. We also conducted a thorough literature survey on sensor properties of tungsten oxide prepared by various means and found that the sensor response towards NO2 registered in this work achieved the highest level. The most intriguing feature of the material obtained was a highly reproducible sensor signal at room temperature which was more than 100 times higher than any reported previously for WO3. The probable reason for such high sensor response was the presence of two WO3 polymorphs (-WO3 and h-WO3) in the material synthesized using a peroxide-assisted route. In order to further investigate synthesizedWO3 materials, sophisticated experimental (XRD, SEM, TEM, BET) and theoretical (B3LYP, HSE) methods have been used, as well as resistance and sensor response measurements at various temperatures.

scholarly journals Growth of Defect-Induced Carbon Nanotubes for Low-Temperature Fruit Monitoring Sensor

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 131
Author(s):  
Nagih M. Shaalan ◽  
Osama Saber ◽  
Faheem Ahmed ◽  
Abdullah Aljaafari ◽  
Shalendra Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Low Temperature ◽  
Recovery Time ◽  
Smooth Surface ◽  
Operating Temperature ◽  
Sensor Response ◽  
Time Constants ◽  
Gas Concentration ◽  
Low Intensity ◽  
Response And Recovery

Herein, a carbon nanotubes-based sensor has been grown for the purpose of ethylene detection. The prepared CNTs had a crystalline structure with a smooth surface of 11.0 nm in diameter and 10.0 µm in length. The low-intensity graphite peak (G-band) as compared to the peak of the defect (D-band) characterizes the defects in the CNTs. An MWNTs-gas sensor was fabricated for monitoring the ethylene gas. The highest response was recorded at a low operating temperature of 30 °C. The sensor was also examined at 300 ppb up to 10 ppm and it showed a response of 2% up to 28%. The sensor response and recovery time constants were varied from 60 to 300 s, depending on the gas concentration. The results that were obtained for the synthetic ethylene gas were also compared with the real measurements for banana ripening. The results confirmed that the sensor is appropriate for the monitoring of fruit ripening.

Two-Dimensional Tin Disulfide Nanosheets for Enhanced Sodium Storage

ACS Nano ◽  
2015 ◽  
Vol 9 (11) ◽  
pp. 11371-11381 ◽  
Author(s):  
Wenping Sun ◽  
Xianhong Rui ◽  
Dan Yang ◽  
Ziqi Sun ◽  
Bing Li ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Tin Disulfide ◽  
Sodium Storage

scholarly journals c-Perpendicular Orientation of Poly(ʟ-lactide) Films

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1572
Author(s):  
Baku Nagendra ◽  
Paola Rizzo ◽  
Christophe Daniel ◽  
Lucia Baldino ◽  
Gaetano Guerra
Keyword(s):  
Low Temperature ◽  
Film Plane ◽  
Wide Angle ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Amorphous Films ◽  
High Transparency ◽  
X Ray ◽  
Crystalline Forms ◽  
Induced Crystallization

Poly(ʟ-lactide) (PLLA) films, even of high thickness, exhibiting co-crystalline and crystalline α phases with their chain axes preferentially perpendicular to the film plane (c⊥ orientation) have been obtained. This c⊥ orientation, unprecedented for PLLA films, can be achieved by the crystallization of amorphous films as induced by low-temperature sorption of molecules being suitable as guests of PLLA co-crystalline forms, such as N,N-dimethylformamide, cyclopentanone or 1,3-dioxolane. This kind of orientation is shown and quantified by two-dimensional wide-angle X-ray diffraction (2D-WAXD) patterns, as taken with the X-ray beam parallel to the film plane (EDGE patterns), which present all the hk0 arcs centered on the meridian. PLLA α-form films, as obtained by low-temperature guest-induced crystallization, also exhibit high transparency, being not far from those of the starting amorphous films.

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