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Synthesis of ZnGa(2)O(4) Hierarchical Nanostructure by Au Catalysts Induced Thermal Evaporation.

Chen XM, Fei GT, Yan J, Zhu YQ, De Zhang L - Nanoscale Res Lett (2010)

Bottom Line: In this paper, ZnGa(2)O(4) hierarchical nanostructures with comb-like morphology are fabricated by a simple two-step chemical vapor deposition (CVD) method: first, the Ga(2)O(3) nanowires were synthesized and employed as templates for the growth of ZnGa(2)O(4) nanocombs; then, the as-prepared Ga(2)O(3) nanowires were reacted with ZnO vapor to form ZnGa(2)O(4) nanocombs.The as-prepared ZnGa(2)O(4) nanocombs were highly crystallized with cubic spinel structure.From the photoluminescence (PL) spectrum, a broad band emission in the visible light region was observed of as-prepared ZnGa(2)O(4) nanocombs, which make it promising application as an optical material.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 230031 Hefei, People's Republic of China.

ABSTRACT
In this paper, ZnGa(2)O(4) hierarchical nanostructures with comb-like morphology are fabricated by a simple two-step chemical vapor deposition (CVD) method: first, the Ga(2)O(3) nanowires were synthesized and employed as templates for the growth of ZnGa(2)O(4) nanocombs; then, the as-prepared Ga(2)O(3) nanowires were reacted with ZnO vapor to form ZnGa(2)O(4) nanocombs. Before the reaction, the Au nanoparticles were deposited on the surfaces of Ga(2)O(3) nanowires and used as catalysts to control the teeth growth of ZnGa(2)O(4) nanocombs. The as-prepared ZnGa(2)O(4) nanocombs were highly crystallized with cubic spinel structure. From the photoluminescence (PL) spectrum, a broad band emission in the visible light region was observed of as-prepared ZnGa(2)O(4) nanocombs, which make it promising application as an optical material.

No MeSH data available.


Low-magnification (a) and high-magnification (b) SEM images of products obtained without annealing
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Figure 5: Low-magnification (a) and high-magnification (b) SEM images of products obtained without annealing

Mentions: The growth of comb-like ZnGa2O4 nanostructures follows the VLS process (as shown in Fig. 4). During the previous annealing process, Au nanoparticles have arranged on the side surface of Ga2O3 nanowires (Stage I in Fig. 4). During the heating process, the starting material ZnO powder reacted with carbon to form Zn and/or ZnOx vapors at 850°C. The vapors were carried downstream to the Ga2O3 nanowires by Ar gas (stage II in Fig. 4). These vapors deposited on the surface of the Ga2O3 nanowires and ZnGa2O4 stem formed through reaction (stage III in Fig. 4). The orderly arranged Au nanoparticles on the side surface of Ga2O3 nanowires seem to be the preferred sites for the growth of ZnGa2O4 nanoteeth. In the growth process, Zn and/or ZnOx vapor and the remained O2 may be absorbed by Au nanoparticles, and Ga in nanowires may also diffuse to these sites. When the alloy droplets got supersaturated, ZnGa2O4 may nucleate to form the teeth (stage III in Fig. 4). During the heating process, the gradually reaction of Ga2O3 nanowires with Zn and/or ZnOx vapor causes the continuous consumption of Ga source, which results in that the nanoteeth can not growth too long. At the same time, since the mass diffusion of reactant adatoms on the side surface, continuous growth resulting in the formation of tapered teeth (stage IV in Fig. 4). The orderly arranged Au particles on the side surface of Ga2O3 nanowires are very important to the growth of ZnGa2O4 nanocombs. If the annealing process is canceled, no ZnGa2O4 nanocombs can be obtained as shown in Fig. 5. Under this circumstance, Au first exists as a thin layer on the surface of Ga2O3 nanowires. Thus, there are no preferred sites for the growth of teeth. Zn and/or ZnOx vapors directly reacted with Ga2O3 and formed ZnGa2O4 nanowires. It can be seen that controlling the state and position of Au nanoparticle on the Ga2O3 nanowires is the key to obtain ZnGa2O4 nanostructures with desired comb-like morphology.


Synthesis of ZnGa(2)O(4) Hierarchical Nanostructure by Au Catalysts Induced Thermal Evaporation.

Chen XM, Fei GT, Yan J, Zhu YQ, De Zhang L - Nanoscale Res Lett (2010)

Low-magnification (a) and high-magnification (b) SEM images of products obtained without annealing
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2926889&req=5

Figure 5: Low-magnification (a) and high-magnification (b) SEM images of products obtained without annealing
Mentions: The growth of comb-like ZnGa2O4 nanostructures follows the VLS process (as shown in Fig. 4). During the previous annealing process, Au nanoparticles have arranged on the side surface of Ga2O3 nanowires (Stage I in Fig. 4). During the heating process, the starting material ZnO powder reacted with carbon to form Zn and/or ZnOx vapors at 850°C. The vapors were carried downstream to the Ga2O3 nanowires by Ar gas (stage II in Fig. 4). These vapors deposited on the surface of the Ga2O3 nanowires and ZnGa2O4 stem formed through reaction (stage III in Fig. 4). The orderly arranged Au nanoparticles on the side surface of Ga2O3 nanowires seem to be the preferred sites for the growth of ZnGa2O4 nanoteeth. In the growth process, Zn and/or ZnOx vapor and the remained O2 may be absorbed by Au nanoparticles, and Ga in nanowires may also diffuse to these sites. When the alloy droplets got supersaturated, ZnGa2O4 may nucleate to form the teeth (stage III in Fig. 4). During the heating process, the gradually reaction of Ga2O3 nanowires with Zn and/or ZnOx vapor causes the continuous consumption of Ga source, which results in that the nanoteeth can not growth too long. At the same time, since the mass diffusion of reactant adatoms on the side surface, continuous growth resulting in the formation of tapered teeth (stage IV in Fig. 4). The orderly arranged Au particles on the side surface of Ga2O3 nanowires are very important to the growth of ZnGa2O4 nanocombs. If the annealing process is canceled, no ZnGa2O4 nanocombs can be obtained as shown in Fig. 5. Under this circumstance, Au first exists as a thin layer on the surface of Ga2O3 nanowires. Thus, there are no preferred sites for the growth of teeth. Zn and/or ZnOx vapors directly reacted with Ga2O3 and formed ZnGa2O4 nanowires. It can be seen that controlling the state and position of Au nanoparticle on the Ga2O3 nanowires is the key to obtain ZnGa2O4 nanostructures with desired comb-like morphology.

Bottom Line: In this paper, ZnGa(2)O(4) hierarchical nanostructures with comb-like morphology are fabricated by a simple two-step chemical vapor deposition (CVD) method: first, the Ga(2)O(3) nanowires were synthesized and employed as templates for the growth of ZnGa(2)O(4) nanocombs; then, the as-prepared Ga(2)O(3) nanowires were reacted with ZnO vapor to form ZnGa(2)O(4) nanocombs.The as-prepared ZnGa(2)O(4) nanocombs were highly crystallized with cubic spinel structure.From the photoluminescence (PL) spectrum, a broad band emission in the visible light region was observed of as-prepared ZnGa(2)O(4) nanocombs, which make it promising application as an optical material.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 230031 Hefei, People's Republic of China.

ABSTRACT
In this paper, ZnGa(2)O(4) hierarchical nanostructures with comb-like morphology are fabricated by a simple two-step chemical vapor deposition (CVD) method: first, the Ga(2)O(3) nanowires were synthesized and employed as templates for the growth of ZnGa(2)O(4) nanocombs; then, the as-prepared Ga(2)O(3) nanowires were reacted with ZnO vapor to form ZnGa(2)O(4) nanocombs. Before the reaction, the Au nanoparticles were deposited on the surfaces of Ga(2)O(3) nanowires and used as catalysts to control the teeth growth of ZnGa(2)O(4) nanocombs. The as-prepared ZnGa(2)O(4) nanocombs were highly crystallized with cubic spinel structure. From the photoluminescence (PL) spectrum, a broad band emission in the visible light region was observed of as-prepared ZnGa(2)O(4) nanocombs, which make it promising application as an optical material.

No MeSH data available.