Preparation and Characterization of ZnO Hollow Micro-spheres with Excellent Property of Blue Emission

doi:10.3724/SP.J.1077.2013.12168

Abstract

Abstract:

With the assistance of glucose and citrate, hollow micro-spheres of zinc citrate were prepared through low-temperature hydrothermal route, and then hollow micro-spheres of ZnO were obtained by calcinating the precursor at 500℃ in air. The composition, structures and morphologies of products were characterized by XRD, TG-DSC, SEM, TEM and IR. It was investigated that the precursor hollow micro-spheres with average diameter of 2 μm and thickness of 200 nm were prepared by the hydrothermal route. ZnO hollow micro-spheres prepared by calcinating the precursor with average diameter of 1 μm and thickness of 100 nm were composed of nanoparticles with diameter of 20-30 nm. The room-temperature photoluminescence property of the sample was studied. Under excitation wavelength of 325 nm, the as-prepared ZnO hollow micro-spheres possess excellent properties of blue emission, locating at 469 nm.

Key words: ZnO, hollow micro-spheres, Ostwald ripening, blue emission

CLC Number:

TQ174

SUN Yong-Jiang, WANG Li, JIANG Xue-Hui, CHEN Ke-Zheng. Preparation and Characterization of ZnO Hollow Micro-spheres with Excellent Property of Blue Emission[J]. Journal of Inorganic Materials, 2013, 28(2): 184-188.

Figures/Tables 7

Fig.1 XRD patterns of precursor (a) and ZnO (b)

Fig. 2 SEM images of precursor and ZnO hollow micro-spheres (A) SEM images of zinc citrate precursor; (B) High-magnification SEM images of precursor; (C) SEM images of ZnO hollow micro-spheres; (D) High-magnification SEM images of ZnO hollow micro-spheres

Fig. 3 IR spectra of precursor (a) and ZnO (b)

Fig. 4 DSC-TG curves of precursor

Fig. 5 SEM images of precursor prepared with different concentrations of trisodium citrate

Fig. 6 SEM images of zinc citrate precursor and ZnO hollow micro-spheres prepared with different concentrations of glucose (A, B) 0 mol/L; (C, D) 0.15 mol/L; (E, F) 0.25 mol/L Condition: 0.05 mol/L Zn(NO3)2·6H2O; 0.05 mol/L C6H12N4; 0.05 mol/L trisoclium citrate

Fig. 7 PL spectrum of ZnO hollow micro-spheres

References 16

[1]	YANG Pei-Dong, YAN Hao-Quan, MAO Samuel, et al. Controlled growth of ZnO nanowires and their optical properties. Adv. Funct. Mater., 2002, 12(5): 323-331.
[2]	XU Li-Fen, LIAO Qing, ZHANG Jian-Ping, et al. Single- crystalline ZnO nanotube arrays on conductive glass substrates by selective dissolution of electrodeposited ZnO Nanorod. J. Phys. Chem. C, 2007, 111(12): 4549-4552.
[3]	WANG Wen-Zhong, ZENG Bao-Qing, YANG Jian, et al. Aligned ultralong ZnO nanobelts and their enhanced field emission. Adv. Mater., 2006, 18: 3275-3278.
[4]	GAO Pu-Xian, DING Yong, MAI Wen-Jie, et al. Conversion of zinc oxide nanobelts into superlattice structured nanohelices. Science, 2005, 309: 1700-1704.
[5]	JUNG Soyoung, CHO Won, LEE Hee-Jung, et al. Self-template-directed formation of coordination-polymer hexagonal tubes and rings and their calcination to ZnO rings. Angew. Chem. Int. Ed., 2009, 48: 1459-1462.
[6]	DENG Zi-Wei, CHEN Min, GU Guang-Xin, et al. A facile method to fabricate ZnO hollow spheres and their ptotocatalytic property. J. Phys. Chem. B, 2008, 112(1): 16-22.
[7]	WANG Xi, HU Peng, LI Yuan-Fang, et al. Preparation and characterization of ZnO hollow sphere and ZnO-carbon composite materials using colloidal carbon spheres as templates. J. Phys. Chem. C, 2007, 111(18): 6706-6712.
[8]	QIU Yong-Cai, CHEN Wei, YANG Shi-He, et al. Hierarchical hollow spheres of ZnO and Zn1-xCoxO: dirdcted assembly and room-temperature ferromagnetism. Crystal Growth Design, 2010, 10(1): 177-183.
[9]	CHO Seungho, JANG Ji-Wook, JUNG Alum, et al. Formation of amorphous zinc citrate shperes and their conversion to crystalline ZnO nanostructures. Langmuir, 2011, 27(1): 371-378.
[10]	ZHANG Gao-Ke, SHEN Xiong, YANG Yan-Qing. Facile synthesis of monodisperse porous ZnO shperes by a soluble starch-assisted method and their photocatalytic activity. J. Phys. Chem. C, 2011, 115: 7145-7152.
[11]	FENG Ying-Jie, ZHANG Mei, GUO Min. Studies on the PEG-assisted hydrothermal synthesis and growth mechanism of ZnO microrod and mesoporous microsphere arrays on the substrate. Crystal Growth Design, 2010, 10(4): 177-183.
[12]	LI Wen-Jun, SHI Er-Wei, ZHONG Wei-Zhuo, et al. Growth mechanism and growth habit of oxide crystals. Journal of Crystal Growth, 1999, 203: 186-196.
[13]	LI Qiu-Yu, WANG En-Bo, LI Si-Heng, et al. Template-free polyoxo metalate-assisted synthesis for ZnO hollow spheres. Journal of Solid State Chemistry, 2009, 182: 1149-1155.
[14]	CHEN Zhi-Tao, GAO Lian. A new route toward ZnO hollow spheres by a base-erosion mechanism. Crystal Growth Design, 2008, 8(2): 460-464.
[15]	ZENG Hai-Bo, CAI Wei-Ping, LIU Pei-Sheng, et al. ZnO-based hollow nanoparticles by selective etching: elimination and reconstruction of metal-semiconductor interface, improvement of blue emission and photocatalysis. ACS Nano, 2008, 2(8): 1661-1670.
[16]	ZENG Hai-Bo, DUAN Guo-Tao, LI Yue, et al. Blue luminescence of ZnO nanoparticles based on non-equilibrium processes: defect origins and emission controls. Adv. Funct. Mater., 2010, 20: 561-572.