Complex nanostructures of ZnO: growth and properties

Umar, Ahmad; Park, Y.K.; Hahn, Yoon‐Bong; Al‐Hajry, A.

doi:10.1504/ijnm.2009.028108

Cited by 3 publications

(2 citation statements)

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“…Depending upon the level and positions of these centers, ZnO is able to emit light in various colors such as violet, blue, green, yellow, orange and red [3,4]. Because of these remarkable * E-mail: 123105005 aibhav@manit.ac.in and peculiar properties, ZnO has a wide range of applications in the areas ranging from photovoltaic [5] to photocatalyst [6,7], from electronics [2] to medical sciences [2,7] and from cosmetics [5] to antibacterial applications [6].…”

Section: Introductionmentioning

confidence: 99%

“…The survey of many significant reports [8,17,18] reveals that the size of the nanostructures is directly proportional to the NaOH concentration where the particle size increases accordingly. This phenomenon is explained in terms of Ostwald ripening [2,5]. According to this, under synthesis conditions, tiny crystallites nucleate first and then they agglomerate into larger crystallites due to the energy difference between large and smaller particles of higher solubility based on Gibbs-Thomson law [19].…”

Section: Introductionmentioning

confidence: 99%

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Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Koutu

Shastri

Malik

2016

Materials Science-Poland

102

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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.

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