TiO2 Nanopowders for Sensing Applications; A Comparison between Traditional and Hydrothermal Synthesis Way

2006 ◽  
Vol 45 ◽  
pp. 205-208 ◽  
Author(s):  
Marco Nagliati ◽  
M.C. Carotta ◽  
S. Gherardi ◽  
Isidoro Giorgio Lesci ◽  
G. Martinelli
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Spherical Shape ◽  
Morphological Properties ◽  
Fundamental Parameter ◽  
Fixed Temperature ◽  
Sensing Applications ◽  
Organometallic Precursor ◽  
Sem Analyses

Aim of the work is to compare the morphological properties of TiO2 powders obtained by different methods. The microstructure of powders is a fundamental parameter to judge if the material is suitable for gas sensing. Materials for chemical sensors have to be composed by nanometric and spherical shaped grains sintered in controlled conditions aimed to obtain Schottky barriers. We investigated a traditional sol-gel (SG) and an hydrothermal (HY) approach to obtain titanium dioxide powders. The same starting materials were chosen for both SG and HY method, a Ti-organometallic precursor and, as solvent, an hydroalcoholic solution. The work is focused on the different methodology and on the outcome related to the two methods (we describe step by step both of them). HY TiO2 powder shows smaller grains than SG TiO2 maintaining spherical shape. A comparison among different handled HY powders shows the role of dwelling time (at fixed temperature) on the nanostructure of grains. Experimental observations are mainly based on XRD and SEM analyses.

scholarly journals Conductometric assisted ZnO and polypyrole composite based NH3 gas sensor

2021 ◽  
Author(s):  
AJAY PRATAP SINGH GAHLOT ◽  
Ayushi Paliwal ◽  
Avinashi Kapoor
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Morphological Properties ◽  
Response Characteristics ◽  
Glass Substrates ◽  
Sensing Applications ◽  
Gel Technique ◽  
Digital Transducers ◽  
Polypyrrole Composite

Abstract Metal oxides are excellent choices as base materials in emerging technologies in the field of Gas Sensors. In this work, an effort is made to prepare the ZnO and polypyrrole composite thin film using sol-gel technique. Nanocomposite thins film was prepared using spin coating on glass substrates for ammonia gas sensing. ZnO and polypyrrole sols were prepared using sol-gel technique and thin films were prepared by using spin coater. The nanocomposite thin films were prepared by varying the percentage composition of ZnO and Polypyrrole. Structural, optical and morphological properties of the prepared films were done using XRD, UV-Visible and SEM studies. The films were separately prepared on Inter-Digital Transducers for gas sensing applications. Gas sensing response characteristics of the prepared sensor were performed using laboratory. The sensing response of the prepared films is observed and found to be maximum (~33) for the 70%PPy+30%ZnO film at a relatively low operating temperature of about 150°C.

Sol–gel cobalt oxide–silica nanocomposite thin films for gas sensing applications

2008 ◽  
Vol 516 (7) ◽  
pp. 1499-1502 ◽  
Author(s):  
V. Musat ◽  
E. Fortunato ◽  
A.M. Botelho do Rego ◽  
R. Monteiro
Keyword(s):  
Thin Films ◽  
Cobalt Oxide ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications ◽  
Nanocomposite Thin Films ◽  
Silica Nanocomposite

scholarly journals Mg-doped and chemo-thermally treated ZnO nanoflowers for ethanol sensing

2021 ◽  
Author(s):  
Santanu Maity ◽  
P.P Sahu ◽  
Tiju Thomas
Keyword(s):  
Gas Sensing ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Wide Range ◽  
Doped Zno ◽  
Ethanol Sensing ◽  
Better Than ◽  
Mg Doped

Abstract ZnO nanostructures are promising for a wide range of applications, including gas sensors. Ethanol sensing using ZnO remains unexplored though. In this paper, we report ethanol-sensing using un-doped ZnO nano flowers and Mg doped ZnO nano flowers. These are grown using a rather simple chemo-thermal process, making this a plausibly scalable technology. To study the structural and morphological properties of undoped ZnO and Mg doped ZnO nanoflowers, Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), x-ray diffraction and Field Emission Scanning Electron Microscopy (FESEM) are carried out. Ethanol sensing properties of undoped ZnO and Mg doped ZnO nanoflower devices are investigated toward different ethanol concentration (concentration range of 1–600 ppm at 100°C–200°C). Our findings show that 15% Mg doped ZnO nano flower is better than ZnO nano flower for ethanol gas-sensing applications.

Sol–gel derived SnO2/Ag2O ceramic nanocomposite for H2 gas sensing applications

2019 ◽  
Vol 6 (11) ◽  
pp. 1150g2 ◽  
Author(s):  
Vahid Salimian Rizi ◽  
Fariborz Sharifianjazi ◽  
Hassan Jafarikhorami ◽  
Nader Parvin ◽  
Leyla Saei Fard ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications ◽  
Ceramic Nanocomposite

Nanostructured sol–gel silica thin films doped with NiO and SnO2for gas sensing applications

2004 ◽  
Vol 14 (19) ◽  
pp. 2889-2895 ◽  
Author(s):  
Alessandro Martucci ◽  
Dario Buso ◽  
Matthias De Monte ◽  
Massimo Guglielmi ◽  
Carlo Cantalini ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications ◽  
Silica Thin Films

Sol-Gel for Gas Sensing Applications

2015 ◽  
pp. 1173-1206 ◽  
Author(s):  
Enrico Della Gaspera ◽  
Massimo Guglielmi ◽  
Alessandro Martucci
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications

Sol-gel materials for gas-sensing applications

1994 ◽  
Vol 19 (1-3) ◽  
pp. 506-510 ◽  
Author(s):  
Alan Wilson ◽  
John D. Wright ◽  
Julian J. Murphy ◽  
Mark A.M. Stroud ◽  
Stephen C. Thorpe
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications

SYNTHESIS AND CHARACTERIZATION OF PURE AND Zn-DOPED SnO2 NANOPOWDERS

2013 ◽  
Vol 22 ◽  
pp. 452-457 ◽  
Author(s):  
PARUL GUPTA ◽  
RISHI VYAS ◽  
B. L. CHOUDHARY ◽  
K. SACHDEV ◽  
D. S. PATIL ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Sensing Applications ◽  
Zn Addition ◽  
Vis Spectroscopy ◽  
Electrical Characterizations

Pure and 4.5 wt% Zn- doped SnO2 nanopowders were synthesized by sol-gel method. These nanopowders were characterized by X- ray diffraction, Scanning electron microscopy, UV-Vis spectroscopy, I-V measurements and R-T measurements. XRD results confirmed the formation of tetragonal rutile type SnO2 with the average crystallite size of 14 ± 1 nm which decreased to 9 ± 1 nm with 4.5 wt% Zn addition. Increase in band gap is observed from UV-Vis spectroscopy. Electrical characterizations revealed increase in resistivity with Zn addition. Temperature dependent resistance measurement showed that both the pure and the Zn- doped samples are suitable for gas sensing applications. A detailed study of these synthesized nanostructured samples is presented and discussed in the paper.

Porous sol gel silica films doped with crystalline NiO nanoparticles for gas sensing applications

2006 ◽  
Vol 40 (2-3) ◽  
pp. 299-308 ◽  
Author(s):  
D. Buso ◽  
M. Guglielmi ◽  
A. Martucci ◽  
C. Cantalini ◽  
M. L. Post ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Nio Nanoparticles ◽  
Silica Films ◽  
Sensing Applications
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