scholarly journals A highly selective and sensitive H2S sensor at low temperatures based on Cr-doped α-Fe2O3 nanoparticles

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4150-4156 ◽  
Author(s):  
Dongyang Xue ◽  
Rui Zhou ◽  
Xiaoping Lin ◽  
Xiaochuan Duan ◽  
Qiuhong Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Hydrothermal Reaction ◽  
High Sensitivity ◽  
Fe2o3 Nanoparticles ◽  
Sensitivity And Selectivity ◽  
One Step

Cr-doped α-Fe2O3 nanoparticles were synthesized by one-step hydrothermal reaction and showed high sensitivity and selectivity to H2S at low temperature.

One-step synthesis of ultra-small Fe2O3 nanoparticles on carbon nanotubes at a low temperature as a high-performance anode for supercapacitors

Ionics ◽  
2020 ◽  
Vol 26 (10) ◽  
pp. 5211-5219
Author(s):  
Junming Xu ◽  
Miao Li ◽  
Weiqin Sheng ◽  
Jun Wu ◽  
Kaixin Song ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Low Temperature ◽  
High Performance ◽  
Fe2o3 Nanoparticles ◽  
One Step

Biological Activity Test of Dendrobium Huoshanense and Its Application in the Detection of Environmental Pollutant Phenols

2021 ◽  
Vol 13 (7) ◽  
pp. 1205-1214
Author(s):  
Yujuan Wang ◽  
Jun Dai ◽  
Peipei Wei ◽  
Yongping Cai ◽  
Bangxing Han
Keyword(s):  
Quantum Dots ◽  
Hydrothermal Reaction ◽  
High Sensitivity ◽  
Carbon Quantum Dots ◽  
Environmental Pollutant ◽  
One Step ◽  
New Type ◽  
Filtration Effect ◽  
Dendrobium Huoshanense

ABSTRACTIn this research, a new type of carbon quantum dot was prepared from Dendrobium huoshanense via one-step hydrothermal reaction at 200 °C for 6 h. The as-derived carbon quantum dots exhibited good fluorescence properties, with quantum yield of 23.57%. The extraction and determination of Dendrobium huoshanense enzymes activity were performed for different incubation times to study the theoretical reference for the dynamic changes of the main enzyme activity in the process of Dendrobium huoshanense growth and the solid processing industry. The results demonstrated that Dendrobium huoshanense was a low toxic carbon source material. Moreover, the prepared carbon quantum dots exhibited high sensitivity for the detection of nonylphenol, allowing a range of linear response of 0.5–50 µM (R2 = 0.9997). The detection limit was a slow as 95.32 nM. These results indicated that fluorescence internal filtration effect influenced nonylphenol-induced quenching of the Dendrobium huoshanense-carbon quantum dots fluorescence. The Dendrobium huoshanense-carbon quantum dots were successfully used to track nonylphenol in environmental samples. Therefore, their exploitation offers a promising approach for environmental pollutant detection.

Fabrication of SnO2–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO2 gas

Nanoscale ◽  
2015 ◽  
Vol 7 (28) ◽  
pp. 12133-12142 ◽  
Author(s):  
Lei Li ◽  
Chunmei Zhang ◽  
Wei Chen
Keyword(s):  
Low Temperature ◽  
High Sensitivity ◽  
Temperature Sensing ◽  
Gas Detection ◽  
Hybrid Nanostructure ◽  
Sensitivity And Selectivity ◽  
Sensing Performance

A SnO2–SnO hybrid nanostructure with p–n heterojunctions exhibits enhanced sensing performance for NO2 gas detection with high sensitivity and selectivity.

scholarly journals Low temperature epitaxial NiSi2 formation on Si(111) by diffusing Ni through amorphous Ni–Zr

1990 ◽  
Vol 5 (2) ◽  
pp. 341-346 ◽  
Author(s):  
R. de Reus ◽  
H. C. Tissink ◽  
F. W. Saris
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Amorphous Alloys ◽  
Single Crystal Silicon ◽  
Nucleation And Growth ◽  
Annealing Process ◽  
Diffusion Barriers ◽  
Silicon Substrates ◽  
Crystal Silicon ◽  
One Step

Although amorphous alloys are known to be good diffusion barriers, amorphous nickel-zirconium is shown to react with Si at relatively low temperatures. Diffusion of Ni at 350°C through an amorphous Ni–Zr buffer layer leads to the formation of epitaxial NiSi2 on single crystal silicon substrates. Interplay of mobility and thermodynamics is applicable for epitaxial silicide nucleation and growth. Also, a one-step annealing process in oxygen ambient leads to bilayer formation of NiSi2/ZrO2 structures on silicon substrates.

scholarly journals Styrene and Azo-Styrene Based Colorimetric Sensors for Highly Selective Detection of Cyanide

2017 ◽  
Vol 17 (2) ◽  
pp. 238
Author(s):  
Agustina Eka Prestiani ◽  
Bambang Purwono
Keyword(s):  
Color Change ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Aqueous Media ◽  
Colour Change ◽  
High Sensitivity ◽  
Colorimetric Sensing ◽  
Sensitivity And Selectivity ◽  
One Step ◽  
Knoevenagel Condensation Reaction

A novel styrene (1) and azo-styrene (2) based chemosensor from vanillin has been successfully synthesized. Sensor 1 was obtained by one step Knoevenagel condensation of Ultrasound method and sensor 2 by coupling diazo and Knoevenagel condensation reaction. Both of sensors showed high sensitivity and selectivity to detect CN- in aqueous media, even the presence of other anions, such as F-, Cl-, Br-, I-, CO32-, SO42-, H2PO4-, and AcO-. Colorimetric sensing of sensor 1 is inclined to be deprotonating of sensor binding site in the presence of cyanide and consequently improve the selectivity and sensitivity in sensing cyanide which displayed color change of sensor from yellowness to red-purple and then purple in 1 min. Sensor 2 exhibited chemodosimeter phenomenon which is caused by the nucleophilic addition of cyanide with a colour change from green to greenish-blue. The results enable to do an anion detection by a naked eye.

scholarly journals Fluorescence Sensing Platforms for Epinephrine Detection Based on Low Temperature Cofired Ceramics

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1429
Author(s):  
Sylwia Baluta ◽  
Karol Malecha ◽  
Agnieszka Świst ◽  
Joanna Cabaj
Keyword(s):  
Detection Limit ◽  
Low Temperature ◽  
High Sensitivity ◽  
Fluorescence Sensing ◽  
Free System ◽  
Injection Test ◽  
Sensing Platforms ◽  
Sensitivity And Selectivity ◽  
Cofired Ceramics ◽  
Optimized Conditions

A novel fluorescence-sensing pathway for epinephrine (EP) detection was investigated. The ceramic-based miniature biosensor was developed through the immobilization of an enzyme (laccase, tyrosinase) on a polymer—poly-(2,6-di([2,2′-bithiophen]-5-yl)-4-(5-hexylthiophen-2-yl)pyridine), based on low temperature cofired ceramics technology (LTCC). The detection procedure was based on the oxidation of the substrate, i.e., in the presence of the enzyme. An alternative enzyme-free system utilized the formation of a colorful complex between Fe2+ ions and epinephrine molecules. With the optimized conditions, the analytical performance illustrated high sensitivity and selectivity in a broad linear range with a detection limit of 0.14–2.10 nM. Moreover, the strategy was successfully used for an EP injection test with labeled pharmacological samples.

One-step solution synthesis of Fe2O3 nanoparticles at low temperature

2011 ◽  
Vol 406 (4) ◽  
pp. 1013-1016 ◽  
Author(s):  
Youyi Sun ◽  
Guizheng Guo ◽  
Binhua Yang ◽  
Wei Cai ◽  
Ye Tian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fe2o3 Nanoparticles ◽  
Solution Synthesis ◽  
One Step

Solution synthesis of pure 2H CuFeO2 at low temperatures

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 26392-26397 ◽  
Author(s):  
Yi Jin ◽  
George Chumanov
Keyword(s):  
Low Temperature ◽  
Absorption Coefficient ◽  
Band Gap ◽  
Low Temperatures ◽  
Hydrothermal Reaction ◽  
Solution Synthesis

Pure 2H CuFeO2 was synthesized via a low temperature hydrothermal reaction and its band gap and absorption coefficient was determined.

scholarly journals Hydrothermal Synthesis of CeO2-SnO2 Nanoflowers for Improving Triethylamine Gas Sensing Property

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1025 ◽  
Author(s):  
Dongping Xue ◽  
Yan Wang ◽  
Jianliang Cao ◽  
Zhanying Zhang
Keyword(s):  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
Pure Sno2 ◽  
Characterization Methods ◽  
Working Temperature ◽  
Wide Range ◽  
Sensitivity And Selectivity ◽  
One Step ◽  
The One ◽  
Optimum Working

Developing the triethylamine sensor with excellent sensitivity and selectivity is important for detecting the triethylamine concentration change in the environment. In this work, flower-like CeO2-SnO2 composites with different contents of CeO2 were successfully synthesized by the one-step hydrothermal reaction. Some characterization methods were used to research the morphology and structure of the samples. Gas-sensing performance of the CeO2-SnO2 gas sensor was also studied and the results show that the flower-like CeO2-SnO2 composite showed an enhanced gas-sensing property to triethylamine compared to that of pure SnO2. The response value of the 5 wt.% CeO2 content composite based sensor to 200 ppm triethylamine under the optimum working temperature (310 °C) is approximately 3.8 times higher than pure SnO2. In addition, CeO2-SnO2 composite is also significantly more selective for triethylamine than pure SnO2 and has better linearity over a wide range of triethylamine concentrations. The improved gas-sensing mechanism of the composites toward triethylamine was also carefully discussed.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

Sign in / Sign up

Export Citation Format

Share Document