Large-scale cubic InN nanocrystals by a combined solution- and vapor-phase method under silica confinement.
Large-scale cubic InN nanocrystals were synthesized by a combined solution- and vapor-phase method under silica confinement. Nearly monodisperse cubic InN nanocrystals with uniform spherical shape were dispersed stably in various organic solvents after removal of the silica shells. The average size of InN nanocrystals is 5.7 ± 0.6 nm. Powder X-ray diffraction results indicate that the InN nanocrystals are of high crystallinity with a cubic phase. X-ray photoelectron spectroscopy and energy-dispersive spectroscopy confirm that the nanocrystals are composed of In and N elements. The InN nanocrystals exhibit infrared photoluminescence at room temperature, with a peak energy of ~0.62 eV, which is smaller than that of high-quality wurtzite InN (~0.65-0.7 eV) and is in agreement with theoretical calculations. The small emission peak energy of InN nanocrystals, as compared to other low-cost solution or vapor methods, reveals the superior crystalline quality of our samples, with low or negligible defect density. This work will significantly promote InN-based applications in IR optoelectronic device and biology.
Research Center of Materials Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China. zchen@bit.edu.cn
Zhuo
Z
Chen
Yanan
Y
Li
Chuanbao
C
Cao
Songrui
S
Zhao
Saeed
S
Fathololoumi
Zetian
Z
Mi
Xingyan
X
Xu
D005740:Gases; D007204:Indium / Q000737:chemistry*; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D009566:Nitrates / Q000737:chemistry*; D012822:Silicon Dioxide; D013057:Spectrum Analysis / Q000379:methods
D005740:Gases; D009566:Nitrates; D007204:Indium; D012822:Silicon Dioxide; C089767:indium nitrate