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Liquid petroleum gas sensing performance enhanced by CuO modification of nanocrystalline ZnO-TiO2 Cover

Liquid petroleum gas sensing performance enhanced by CuO modification of nanocrystalline ZnO-TiO2

Materials Science-Poland
Volume 34 (2016): Issue 3 (September 2016)
By: ,   and    
Open Access
|Sep 2016
Figures & tables

Figures & Tables

Fig. 1

XRD patterns of synthesized ZnO-TiO2 powder samples with molar ratios (A) 9:1, (B) 7:3, (C) 1:1, (D) 3:7 and (E) 1:9.

Fig. 2

TEM images of synthesized ZnO-TiO2 powder samples with molar ratios (A) 9:1, (B) 7:3, (C) 1:1, (D) 3:7 and (E) 1:9.

Fig. 3

SEM images of ZnO-TiO2 thick film with molar ratios (A) 9:1, (B) 7:3, (C) 1:1, (D) 3:7 and (E) 1:9.

Table 1

Composition of 0.1 M, 0.2 M and 0.3 M CuO modified and unmodified ZnO-TiO2 thick film (molar ratio 1:1).

Element wt.%0.1 M CuO0.2 M CuO0.3 M CuOZnO-TiO2 (molar ratio 1:1)
Norm. wt.%Atom. at.%Norm. wt.%Atom. at.%Norm. wt.%Atom. at.%Norm. wt.%Atom. at.%
O29.6260.6124.5354.1721.8150.5732.5863.30
Zn1.090.541.240.671.050.6040.6619.33
Ti21.6714.7421.3115.7319.9215.4326.7617.37
Cu47.6224.4152.9229.4357.2233.40NilNil
Fig. 4

SEM images of ZnO-TiO2 thick films (with molar ratio 1:1), modified with (A) 0.1 M CuO, (B) 0.2 M CuO, (C) 0.3 M CuO.

Fig. 5

I-V characteristics of nanocrystalline ZnO-TiO2 thick films with molar ratios (A) 9:1, (B) 7:3, (C) 1:1, (D) 3:7 and (E) 1:9 at room temperature.

Fig. 6

Response of ZnO-TiO2 thick films with molar ratios (A) 9:1, (B) 7:3, (C) 1:1, (D) 3:7 and (E) 1:9 toward 286 ppm LPG.

Fig. 7

(A) Resistance of ZnO-TiO2 thick film (1:1 molar ratio) vs. operating temperature. (B) Arrhenius plot for 0.1 M, 0.2 M, 0.3 M CuO modified and unmodified ZnO-TiO2 thick films (1:1 molar ratio) in air ambient.

Table 2

Activation energy of 0.1 M, 0.2 M, 0.3 M CuO modified and unmodified ZnO-TiO2 thick film (molar ratio 1:1) in air ambient.

ZnO-TiO2 thick film (molar ratio 1:1)Activation energy Ea (eV)
Ea(I) 30 °C - 130 °CEa (II) 175 °C - 225 °C
Unmodified0.3780.201
0.1 M CuO modified0.2370.737
0.2 M CuO modified0.2400.861
0.3 M CuO modified0.2340.625
Fig. 8

Response of 0.1 M, 0.2 M and 0.3 M CuO modified ZnO-TiO2 thick films (with molar ratio1:1) towards 286 ppm LPG.

Fig. 9

Response and recovery time of 0.2 M CuO modified ZnO-TiO2 based thick film (with molar ratio 1:1) towards 286 ppm LPG at 185 °C.

Fig. 10

Stability of 0.2 M CuO modified ZnO-TiO2 based thick film (with molar ratio 1:1) towards 286 ppm LPG at 185 °C.

Fig. 11

Response of 0.2 M CuO modified ZnO-TiO2 (1:1 molar ratio) based thick film towards NH3, CO2, H2S and LPG at 185 °C.

DOI: https://doi.org/10.1515/msp-2016-0083 | Journal eISSN: 2083-134X (formerly 2083-124X) | Journal ISSN: 2083-1331
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Language: English
Page range: 571 - 581
Submitted on: Nov 17, 2015
Accepted on: Jul 3, 2016
Published on: Sep 28, 2016
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Keywords:
ZnO-TiO2,
nanocrystalline material,
gas sensor,
CuO
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2016 R.B. Pedhekar, F.C. Raghuwanshi, V.D. Kapse, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 34 (2016): Issue 3 (September 2016)
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