Alcohol sensing properties of sol–gel prepared Sr(II)-added cobalt aluminate spinel composites

2008 ◽  
Vol 129 (2) ◽  
pp. 741-749 ◽  
Author(s):  
J. Judith Vijaya ◽  
L. John Kennedy ◽  
G. Sekaran ◽  
A. Meenakshisundaram ◽  
R. Thinesh Kumar ◽  
...  
Keyword(s):  
Sol Gel ◽  
Sensing Properties ◽  
Cobalt Aluminate

Novel sol–gel method for synthesis of cobalt aluminate and its photocatalyst application

2015 ◽  
Vol 26 (11) ◽  
pp. 8720-8725 ◽  
Author(s):  
Saman Rahnamaeiyan ◽  
Mahdi Nasiri ◽  
Ruhollah Talebi ◽  
Saeid Khademolhoseini
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Cobalt Aluminate

scholarly journals Optical and sensing properties of sol-gel derived vanadium pentoxide thin films with porous and dense structures

2018 ◽  
Vol 992 ◽  
pp. 012038 ◽  
Author(s):  
T Babeva ◽  
H Awala ◽  
J Grand ◽  
K Lazarova ◽  
M Vasileva ◽  
...  
Keyword(s):  
Thin Films ◽  
Vanadium Pentoxide ◽  
Sol Gel ◽  
Sensing Properties

Sol-gel derived aluminium doped zinc oxide thin films: A view of aluminium doping effect on physicochemical and NO2 sensing properties

2019 ◽  
Vol 775 ◽  
pp. 466-473 ◽  
Author(s):  
A.R. Nimbalkar ◽  
N.B. Patil ◽  
V.V. Ganbavle ◽  
S.V. Mohite ◽  
K.V. Madhale ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Sol Gel ◽  
Doping Effect ◽  
Oxide Thin Films ◽  
Sensing Properties ◽  
Aluminium Doping

CO Sensing Properties of La1-xCaxFeO3 Perovskite Nanocrystalline Materials

2011 ◽  
Vol 495 ◽  
pp. 323-326 ◽  
Author(s):  
Ming Zhao ◽  
Li Hui Sun ◽  
Ji Fan Hu ◽  
Hong Wei Qin
Keyword(s):  
Response Time ◽  
Nanocrystalline Materials ◽  
Recovery Time ◽  
Operating Temperature ◽  
Sol Gel ◽  
Nanocrystalline Powders ◽  
Orthorhombic Structure ◽  
Gel Method ◽  
Sensing Properties ◽  
Sol Gel Method

The La1-xCaxFeO3 nanocrystalline powders were prepared by sol-gel method. These powders crystallized as perovskite orthorhombic structure. With an increase of Ca content, the resistance of La1-xCaxFeO3 sensors in air decreases at first, undergoes a minimum at x=0.3, and then increases again. La1-xCaxFeO3-based sensors show sensitive responses to CO. Among those La1-xCaxFeO3-based sensors, the sensor with x=0.2 shows the highest response to 200 ppm CO at operating temperatures below 325°C. The highest response S=(RCO-Rair)/RCO for the La0.8Ca0.2FeO3 based sensor to 200 ppm CO is 87% with response time 15 s and recovery time 60 s at an operating temperature of 100°C.

Sol–gel based fiber optic pH nanosensor: Structural and sensing properties

2016 ◽  
Vol 238 ◽  
pp. 8-18 ◽  
Author(s):  
Shumaila Islam ◽  
Noriah Bidin ◽  
Saira Riaz ◽  
Ganesan Krishnan ◽  
Shahzad Naseem
Keyword(s):  
Fiber Optic ◽  
Sol Gel ◽  
Sensing Properties

TUNGSTEN-DOPED TiO2 NANOLAYERS WITH IMPROVED CO2 GAS SENSING PROPERTIES FOR ENVIRONMENTAL APPLICATIONS

2017 ◽  
Vol 24 (Supp02) ◽  
pp. 1850024 ◽  
Author(s):  
MALIHEH SABERI ◽  
ALI AKBAR ASHKARRAN
Keyword(s):  
Electron Microscopy ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Sol Gel ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Sensing Properties ◽  
Vis Spectroscopy ◽  
Gas Sensing Properties ◽  
Tungsten Concentration

Tungsten-doped TiO2 gas sensors were successfully synthesized using sol–gel process and spin coating technique. The fabricated sensor was characterized by field emission scanning electron microscopy (FE-SEM), ultraviolet visible (UV–Vis) spectroscopy, transmission electron microscopy (TEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Gas sensing properties of pristine and tungsten-doped TiO2 nanolayers (NLs) were probed by detection of CO2 gas. A series of experiments were conducted in order to find the optimum operating temperature of the prepared sensors and also the optimum value of tungsten concentration in TiO2 matrix. It was found that introducing tungsten into the TiO2 matrix enhanced the gas sensing performance. The maximum response was found to be (1.37) for 0.001[Formula: see text]g tungsten-doped TiO2 NLs at 200[Formula: see text]C as an optimum operating temperature.

scholarly journals Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 785 ◽  
Author(s):  
Wen-Dong Zhou ◽  
Davoud Dastan ◽  
Jing Li ◽  
Xi-Tao Yin ◽  
Qi Wang
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sol Gel ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Type Response ◽  
Properties Of Composites

Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H2, so it is difficult for these gas sensors to distinguish the two gases. In this paper, simple sol–gel method was employed to obtain the ZnO–xNiO composites. Gas sensing performance results illustrated that the gas sensing properties of composites with x > 0.425 showed a p-type response to both CO and H2, while the gas sensing properties of composites with x < 0.425 showed an n-type response to both CO and H2. However, it was interesting that ZnO–0.425NiO showed a p-type response to CO but an discriminable response (n-type) to H2, which indicated that modulating the p-type or n-type semiconductor concentration in p-n composites could be an effective method with which to improve the discriminability of this type of gas sensor regarding CO and H2. The phenomenon of the special gas sensing behavior of ZnO–0.425NiO was explained based on the experimental observations and a range of characterization techniques, including XRD, HRTEM and XPS, in detail.

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