Growth and Characterization of Pencil-Like ZnO Nanowires in the Presence of a Disturbance in Boundary Layer

doi:10.1007/s40195-016-0425-y

Abstract

Abstract:

Pencil-like zinc oxide (ZnO) nanowire was synthesized on Si (111) substrate through a simple vapor phase method using a mixture of zinc oxide and graphite as the source material. The source inside a quartz tube created a Zn-rich vapor that facilitated the formation and growth of ZnO nanowires. Field emission scanning electron microscopic studies indicated that pencil-like ZnO nanowires had a size of the range from 50 to 150 nm in diameter and several microns in length. X-ray diffraction was used to investigate the crystal structure of ZnO nanowires. Raman scattering and photoluminescence were applied to characterize the optical properties of the pencils. The growth mechanism of the nanopencils was discussed based on the growth conditions.

Key words: Zinc, oxide, Nanowires, Vapor-phase, transport, Pencil-like

A. Kamalianfar, Mahmoud Godarz Naseri, Marzih Kamalianfar, S. A. Halim, K. P. Lim. Growth and Characterization of Pencil-Like ZnO Nanowires in the Presence of a Disturbance in Boundary Layer[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(6): 595-600.

Figures/Tables 7

Fig. 1 Schematic of the setup used for the growth of the ZnO nanowires

Fig. 2 Typical FESEM images of the ZnO nanopencil grown in the modified tube a-c and ZnO nanostructure grown in the normal tube d

Fig. 3 XRD patterns of the ZnO nanowires grown by modified (sample S1) and normal (sample S2) vapor method (1)

Table 1 Comparison of position, height, FWHM, and crystallite size of (002) diffraction peaks

Sample	Position angle, 2θ	Height (CTs)	FWHM, β	Crystallite size (nm)
S1	34.49	1485	0.34	49
S2	34.45	1725	0.39	43

Fig. 4 Room-temperature photoluminescence spectra, the ZnO nanopencil grown in the modified tube (sample S1), and the ZnO nanostructure grown in the normal tube (sample S2)

Fig. 5 Raman spectra excited by 514-nm line, the ZnO nanopencil grown in the modified tube (sample S1), and the ZnO nanostructure grown in the normal tube (sample S2)

Fig. 6 Illustration of a separation of boundary layer

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