Hydrothermal Growth of Zinc Oxide (ZnO) Nanorods (NRs), Structural, and Chemical Composition Studies for pH Measurement Sensor Applications

Morphology of Zinc Oxide (ZnO) is an important parameter to enhance the efficiency of optoelectronic devices. Morphology also plays a significant role in gas sensing properties of ZnO. In this research work, different morphologies of Zinc Oxide including nanorods, disks and flakes were obtained using Zinc Acetate, Sodium Dodecyl Sulphate and Trisodium Citrate as additives to a parent solution of Zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and Hexamethylenetetramine (HMTA, (CH2)6N4) for hydrothermal growth. Use of Zinc Acetate as an additive has been rarely reported. This work presents the ability of Zinc Acetate to transform the morphology of ZnO nanorods to nanoneedles. Furthermore, in this study addition of Sodium Dodecyl Sulphate and Trisodium Citrate to the parent solution has shown potential for growing continuous granular films by the low cost and low temperature hydrothermal technique. Variation in crystallite size and band gap values with increasing concentration of Zinc Acetate, Sodium Dodecyl Sulphate and Trisodium Sulphate has been studied. Films with crystallite sizes of 7.48 nm and 6.77 nm were achieved with 5 mM Sodium Dodecyl Sulphate and 5 mM Trisodium Citrate respectively. The band gap of films produced with 5 mM Sodium Dodecyl Sulphate and with 5 mM Trisodium Citrate were 3.43 eV and 3.45 eV respectively. Therefore hydrothermal growth with Sodium Dodecyl Sulphate or Trisodium Citrate is a potential technique for obtaining granular ZnO films.

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Influence of Ammonia Solution on Zinc Oxide Nanostructures by Hydrothermal Growth

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.1549 ◽

2014 ◽

Vol 875-877 ◽

pp. 1549-1553 ◽

Cited By ~ 1

Author(s):

Z.B. Huang ◽

X.P. Zou ◽

G.Q. Yang ◽

X.M. Lv ◽

C.L. Wei ◽

...

Keyword(s):

Zinc Oxide ◽

Tin Oxide ◽

Indium Tin Oxide ◽

Zno Nanorods ◽

Precursor Solution ◽

Ammonia Solution ◽

Zinc Nitrate ◽

Hydrothermal Growth ◽

Zinc Oxide Nanostructures ◽

Oxide Nanostructures

In previous work, ZnO nanorods and nanoflowers were synthesized on indium-tin-oxide (ITO) substrates by hydrothermal growth at low temperature ,using the different concentrations of equimolar (1:1) zinc nitrate Zn (NO3)26H2O and methenamine (C6H12N4) mixed as precursors solution, and adding ammonia solution to control the pH levels. In this paper, for comparison, the same experiment without ammonia solution was also discussed. SEM, XRD were utilized to characterize morphologies and crystal structures of ZnO. It was indicated that the pH of precursor solution leads to the significantly changes in the nanostructured ZnO. Besides, a hierarchical structure of some of the micro/nanotubes was obtained .The possible growth mechanism is discussed in this work.

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Photo-initiated growth of zinc oxide (ZnO) nanorods

Materials Letters ◽

10.1016/j.matlet.2008.05.066 ◽

2008 ◽

Vol 62 (24) ◽

pp. 4044-4046 ◽

Cited By ~ 6

Author(s):

E.T.Y. Lee ◽

Y. Shimotsuma ◽

M. Sakakura ◽

M. Nishi ◽

K. Miura ◽

...

Keyword(s):

Zinc Oxide ◽

Zno Nanorods

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Two-Photon Excited Ultraviolet Photoluminescence of Zinc Oxide Nanorods

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.263 ◽

2008 ◽

Vol 8 (11) ◽

pp. 5854-5857 ◽

Cited By ~ 11

Author(s):

Guangping Zhu ◽

Chunxiang Xu ◽

Jing Zhu ◽

Changgui Lu ◽

Yiping Cui ◽

...

Keyword(s):

Zinc Oxide ◽

Emission Band ◽

Single Photon ◽

Zno Nanorods ◽

Zinc Oxide Nanorods ◽

Excitation Wavelength ◽

Photoluminescence Intensity ◽

Vapor Phase Transport ◽

Two Photon ◽

Oxide Nanorods

High density zinc oxide nanorods with uniform size were synthesized on (100) silicon substrate by vapor-phase transport method. The scanning electron microscopy images reveal that the nanorods have an average diameter of about 400 nm. The X-ray diffraction pattern demonstrates the wurtzite crystalline structure of the ZnO nanorods growing along [0001] direction. The single-photon excited photoluminescence presents a strong ultraviolet emission band at 394 nm and a weak visible emission band at 600 nm. When the ZnO nanorods were respectively pumped by various wavelength lasers from 520 nm to 700 nm, two-photon excited ultraviolet photoluminescence was observed. The dependence of the two-photon excited photoluminescence intensity on the excitation wavelength and power was investigated in detail.

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EFFECT OF PRE-HEATING AND SEED LAYER ON HYDROTHERMAL GROWTH AND OPTICAL PROPERTIES OF ZINC OXIDE NANORODS

International Journal of Nanoscience ◽

10.1142/s0219581x11009283 ◽

2011 ◽

Vol 10 (04n05) ◽

pp. 845-849

Author(s):

GAURAV SHUKLA ◽

ALIKA KHARE

Keyword(s):

Optical Properties ◽

Seed Layer ◽

Zno Nanorods ◽

Pulsed Laser ◽

Heating Time ◽

Hydrothermal Growth ◽

Zinc Oxide Nanorods ◽

Growth Time ◽

Oxide Nanorods ◽

Reported Effect

Hydrothermal growth of highly c-axis oriented ZnO nanorods with high aspect ratio on pulsed laser deposited ZnO seed layer is reported. Effect of pre-heating time, growth time and seed layer on the structural, morphological and optical properties of ZnO nanorods is presented. The possible growth mechanism for ZnO nanorods is also discussed.

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