کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1495328 | 992932 | 2011 | 4 صفحه PDF | دانلود رایگان |
We have used aerosol deposition to synthesize defect and micro-strain free, ultra-pure germanium nanoparticles. Transmission electron microscopy images show a core–shell configuration with highly crystalline core material. Powder X-ray diffraction measurements verify the presence of highly pure, nano-scale germanium with average crystallite size of 30 nm and micro-strain of 0.058%. X-ray photoelectron spectroscopy demonstrates that GeOx (x ⩽ 2) shells cover the surfaces of the nanoparticles. Under optical excitation, these nanoparticles exhibit two separate emission bands at room temperature: a visible emission at 500 nm with 0.5–1 ns decay times and an intense near-infrared emission at 1575 nm with up to ∼20 μs lifetime.
► Aerosol synthesis of defect and micro-strain free, ultra-pure Ge nanoparticles.
► TEM shows core–shell configuration with highly crystalline core material.
► Powder XRD verify highly pure nano-scale germanium.
► XPS demonstrates GeOx (x ⩽ 2) shells cover the surfaces of the nanoparticles.
► PL short lived visible peak emission at 500 nm and long lived NIR peak emission at ∼1575 nm.
Journal: Optical Materials - Volume 33, Issue 11, September 2011, Pages 1829–1832