Abstract
A novel microwave-assisted synthesis technique was used for the rapid preparation of nanocrystalline ZnGa 2O 4 at two different temperatures. The crystalline spinel oxide is formed at temperatures as low as 100°C within few minutes, at a high yield of 96%, requiring no post-synthesis annealing. The as-prepared samples are polycrystalline and phase-pure as verified by XRD, with a crystallite size of ∼5 nm. Polycrystalline ZnGa 2O 4 substituted with Mn 2+, Cr 3+, Cu 2+, and Co 2+ was also similarly prepared. All samples are highly monodispersed, as measured by TEM. The ZnGa 2O 4 nanocrystals without further surface modification can be readily dispersed in chloroform to form a fully transparent colloidal solution, using which the bandgap of ZnGa 2O 4 was determined to be ∼4.5 eV. The entire synthesis procedure, including solution preparation, microwave irradiation, and centrifugation takes about 30 minutes, which is faster than any procedure reported for a complex oxide like ZnGa 2O 4, as well as one with a small thermal budget. Photoluminescence shows a broad emission extending from 330 nm to 800 nm, which is surmised to be due to the defect structure in the oxide produced.
| Original language | English |
|---|---|
| Title of host publication | Functional Metal Oxide Nanostructures |
| Pages | 49-54 |
| Number of pages | 6 |
| Volume | 1406 |
| DOIs | |
| Publication status | Published - 20-08-2012 |
| Event | 2011 MRS Fall Meeting - Boston, MA, United States Duration: 28-11-2011 → 02-12-2011 |
Conference
| Conference | 2011 MRS Fall Meeting |
|---|---|
| Country | United States |
| City | Boston, MA |
| Period | 28-11-11 → 02-12-11 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
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Rapid synthesis of nanocrystalline ZnGa 2O 4 phosphor at low temperature. / Kulkarni, Suresh D.; Shivashankar, S. A.
Functional Metal Oxide Nanostructures. Vol. 1406 2012. p. 49-54.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Rapid synthesis of nanocrystalline ZnGa 2O 4 phosphor at low temperature
AU - Kulkarni, Suresh D.
AU - Shivashankar, S. A.
PY - 2012/8/20
Y1 - 2012/8/20
N2 - A novel microwave-assisted synthesis technique was used for the rapid preparation of nanocrystalline ZnGa 2O 4 at two different temperatures. The crystalline spinel oxide is formed at temperatures as low as 100°C within few minutes, at a high yield of 96%, requiring no post-synthesis annealing. The as-prepared samples are polycrystalline and phase-pure as verified by XRD, with a crystallite size of ∼5 nm. Polycrystalline ZnGa 2O 4 substituted with Mn 2+, Cr 3+, Cu 2+, and Co 2+ was also similarly prepared. All samples are highly monodispersed, as measured by TEM. The ZnGa 2O 4 nanocrystals without further surface modification can be readily dispersed in chloroform to form a fully transparent colloidal solution, using which the bandgap of ZnGa 2O 4 was determined to be ∼4.5 eV. The entire synthesis procedure, including solution preparation, microwave irradiation, and centrifugation takes about 30 minutes, which is faster than any procedure reported for a complex oxide like ZnGa 2O 4, as well as one with a small thermal budget. Photoluminescence shows a broad emission extending from 330 nm to 800 nm, which is surmised to be due to the defect structure in the oxide produced.
AB - A novel microwave-assisted synthesis technique was used for the rapid preparation of nanocrystalline ZnGa 2O 4 at two different temperatures. The crystalline spinel oxide is formed at temperatures as low as 100°C within few minutes, at a high yield of 96%, requiring no post-synthesis annealing. The as-prepared samples are polycrystalline and phase-pure as verified by XRD, with a crystallite size of ∼5 nm. Polycrystalline ZnGa 2O 4 substituted with Mn 2+, Cr 3+, Cu 2+, and Co 2+ was also similarly prepared. All samples are highly monodispersed, as measured by TEM. The ZnGa 2O 4 nanocrystals without further surface modification can be readily dispersed in chloroform to form a fully transparent colloidal solution, using which the bandgap of ZnGa 2O 4 was determined to be ∼4.5 eV. The entire synthesis procedure, including solution preparation, microwave irradiation, and centrifugation takes about 30 minutes, which is faster than any procedure reported for a complex oxide like ZnGa 2O 4, as well as one with a small thermal budget. Photoluminescence shows a broad emission extending from 330 nm to 800 nm, which is surmised to be due to the defect structure in the oxide produced.
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U2 - 10.1557/opl.2012.805
DO - 10.1557/opl.2012.805
M3 - Conference contribution
SN - 9781605113838
VL - 1406
SP - 49
EP - 54
BT - Functional Metal Oxide Nanostructures
ER -