<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M – 0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.</p></abstract>

In the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M – 0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Nanotechnology Research Laboratory, Department of Physics, Maulana Azad National Institute of Technology, Bhopal (M.P.),

Materials Science-Poland

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

{"article-title":"Effect of NaOH concentration on optical properties of zinc oxide nanoparticles"}

In the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M – 0.4 M) using wet-chemical co-precipitation method....

Sample	Average crystallite size		Strain (є)
Sample			Strain (є)
UDM (W-H plot) Scherrer formula
C1	55 nm	40 nm	2.133 × 10—³
C2	51 nm	38 nm	2.163 × 10^—3
C3	40 nm	30 nm	2.743 × 10^—3
C4	31 nm	23 nm	3.597 × 10^—3

Sample	Molar ratio	Average particle size
C1	1:1	60 nm
C2	1:2	58 nm
C3	1:3	52 nm
C4	1:4	50 nm

Sample	Precursor concentration		Molar	Reaction temperature	Heating time

	Zinc acetate	NaOH	ratio
C1	0.1M	0.1M	1:1	90 °C	2h
C2	0.1M	0.2M	1:2	90 °C	2h
C3	0.1M	0.3M	1:3	90 °C	2h
C4	0.1M	0.4M	1:4	90 °C	2h

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Pubblicato online: 12 dic 2016

Pagine: 819 - 827

Ricevuto: 13 apr 2016

Accettato: 18 ott 2016

DOI: https://doi.org/10.1515/msp-2016-0119

Parole chiave
NaOH concentration, ZnO nanoparticles, peak shift

© Wroclaw University of Technology

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

Calculated values of average crystallite size and strain for the as-prepared ZnO nanoparticles by UDM (W-H plot) and Scherrer formula.

Average diameter of as-prepared ZnO nanoparticles obtained from field emission scanning electron microscope images.

List of final ZnO samples (C1-C4) obtained at different NaOH concentrations.

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Pubblicato online: 12 dic 2016

Pagine: 819 - 827

Ricevuto: 13 apr 2016

Accettato: 18 ott 2016

DOI: https://doi.org/10.1515/msp-2016-0119

Parole chiaveNaOH concentration, ZnO nanoparticles, peak shift

© Wroclaw University of Technology

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

Calculated values of average crystallite size and strain for the as-prepared ZnO nanoparticles by UDM (W-H plot) and Scherrer formula.

Average diameter of as-prepared ZnO nanoparticles obtained from field emission scanning electron microscope images.

List of final ZnO samples (C1-C4) obtained at different NaOH concentrations.

Parole chiave
NaOH concentration, ZnO nanoparticles, peak shift