<abstract xmlns="http://www.w3.org/1999/xhtml">Undoped and Fe doped ZnO films of different molarities deposited by spray pyrolysis method using zinc nitrate and ferric chloride as precursors show polycrystalline nature and hexagonal wurtzite structure. Crystallite size decreases with an increase in dopant concentration from 0 at.% to 3 at.%. Doping improves the transmission of the films whereas it reduces the optical band gap of ZnO from 3.28 eV to 3.17 eV. The morphology resembles flake-like structures which collapse when the dopant is introduced. The samples are found to be sensitive to CO2 gas. Undoped ZnO shows maximum sensitivity at 350 °C for higher concentration of CO2. Doped samples show maximum sensitivity at 200 °C for all CO2 concentrations i.e. from 500 ppm to 4000 ppm. Maximum sensitivity is achieved at temperatures 350 °C, 250 °C, 300 °C and 450 °C for the samples prepared using precursor solution of 0.1 M molarity.</abstract>

Undoped and Fe doped ZnO films of different molarities deposited by spray pyrolysis method using zinc nitrate and ferric chloride as precursors show polycrystalline nature and hexagonal wurtzite structure. Crystallite size decreases with an increase in dopant concentration from 0 at.% to 3 at.%. Doping improves the transmission of the films whereas it reduces the optical band gap of ZnO from 3.28 eV to 3.17 eV. The morphology resembles flake-like structures which collapse when the dopant is introduced. The samples are found to be sensitive to CO2 gas. Undoped ZnO shows maximum sensitivity at 350 °C for higher concentration of CO2. Doped samples show maximum sensitivity at 200 °C for all CO2 concentrations i.e. from 500 ppm to 4000 ppm. Maximum sensitivity is achieved at temperatures 350 °C, 250 °C, 300 °C and 450 °C for the samples prepared using precursor solution of 0.1 M molarity.

Optical and sensing properties of Fe doped ZnO nanocrystalline thin films

Department of Physics, University of Lucknow, Lucknow-226007, India

Solid-State Physics Laboratory (SSPL), DRDO, New Delhi-110054, India

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Optical and sensing properties of Fe doped ZnO nanocrystalline thin films"}

Undoped and Fe doped ZnO films of different molarities deposited by spray pyrolysis method using zinc nitrate and ferric chloride as precursors show...

Sample	Composition	Optical band gap [eV]
Z1	0.1MZnO	3.28
Z1F1	0.1 M ZnO + 1 % FeCl₃	3.20
Z1F2	0.1 M ZnO + 2 % FeCl₃	3.18
Z1F2	0.1 M ZnO + 3 % FeCl₃	3.17
Z2	0.15M ZnO	3.20
Z2F1	0.15 M ZnO + 1 % FeCl₃	3.24
Z2F2	0.15 M ZnO + 2 % FeCl₃	3.22
Z2F3	0.15 M ZnO + 3 % FeCl₃	3.21

Optical and sensing properties of Fe doped ZnO nanocrystalline thin films

Article Category: Research Article

Publié en ligne: 07 juin 2016

Pages: 354 - 361

Reçu: 17 sept. 2015

Accepté: 25 janv. 2016

DOI: https://doi.org/10.1515/msp-2016-0039

Mots clés
thin films, spray pyrolysis, ZnO, iron, band gap, gas sensing

© Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Variation of optical band gap with Fe dopant concentration.

Optical and sensing properties of Fe doped ZnO nanocrystalline thin films

Article Category: Research Article

Publié en ligne: 07 juin 2016

Pages: 354 - 361

Reçu: 17 sept. 2015

Accepté: 25 janv. 2016

DOI: https://doi.org/10.1515/msp-2016-0039

Mots clésthin films, spray pyrolysis, ZnO, iron, band gap, gas sensing

© Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Variation of optical band gap with Fe dopant concentration.

Mots clés
thin films, spray pyrolysis, ZnO, iron, band gap, gas sensing