Photophysical properties of blue - emitting silicon nanoparticles.
Photophysical properties of blue - emitting silicon nanoparticles.
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DOI：
10.1021/jp903727n
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发表时间：
2009-08-06
期刊：
影响因子：
--
通讯作者：
Gonzalez MC
中科院分区：
文献类型：
--
作者：
Portolés MJ;Nieto FR;Soria DB;Amalvy JI;Peruzzo PJ;Mártire DO;Kotler M;Holub O;Gonzalez MC
通过电化学腐蚀硅片合成了具有强蓝色光致发光的硅纳米颗粒，并在有机溶剂中在N2气氛下超声去除以产生胶体。热处理导致形成直径为3 ± 1 nm的胶体Si颗粒，其在用340 - 380 nm光激发时在400 - 500 nm范围内表现出室温发光。粒子的发射光谱以及单光子和双光子激发光谱对2-甲基丙-2-烯酸甲酯的表面官能化不敏感。然而，衍生化的颗粒在空气饱和的悬浮液中显示出比未衍生化的颗粒（27%）更高的发射量子产率（44%），以及其分散体的更高稳定性。FTIR和XPS光谱表明，颗粒的表面氧化显着。由XPS估计的衍生化颗粒表面处的Si：O：C比为Si 3 O 6（C5 O2 Hy）1，其中y = 7 - 8。在发射光谱和激发光谱中都观察到振动子间距。从单光子激发实验（发射和激发光谱，光致发光量子产率，发光衰减寿命和各向异性相关寿命），以及从双光子激发荧光相关光谱（亮度和扩散系数）和TEM获得的信息表明，蓝色发光颗粒是单分散和球形。颗粒大小清楚地决定了发射和激发光谱区域，如量子限制所预期的，但是硅网络上的Si-O物种的存在和程度对于确定发射的光谱特征和强度似乎至关重要。这种纳米粒子作为量子点在生物学和环境科学中作为发光传感器的应用具有巨大的潜力。
Silicon nanoparticles with strong blue photoluminescence were synthesized by electrochemical etching of silicon wafers and ultrasonically removed under N2 atmosphere in organic solvents to produce colloids. Thermal treatment leads to the formation of colloidal Si particles of 3 ± 1 nm diameter, which upon excitation with 340 – 380 nm light exhibited room temperature luminescence in the range from 400 to 500 nm. The emission and the one- and two-photon excitation spectra of the particles are not sensitive to surface functionalization with methyl 2-methylprop-2-enoate. However, the derivatized particles show higher emission quantum yields in air-saturated suspensions (44%) than the underivatized particles (27%), as well as higher stability of its dispersions. FTIR and XPS spectra indicate a significant surface oxidation of the particles. The Si:O:C ratio at the surface of the derivatized particles estimated from XPS is Si3O6(C5O2Hy)1, with y = 7 - 8. Vibronic spacing is observed in both the emission and excitation spectra. The information obtained from one-photon excitation experiments (emission and excitation spectra, photoluminescence quantum yields, luminescence decay lifetimes and anisotropy correlation lifetimes), as well as from two-photon excitation fluorescence correlation spectroscopy (brightness and diffusion coefficients) and TEM indicate that the blue-emitting particles are monodisperse and ball-shaped. Particle size clearly determines the emission and excitation spectral region, as expected from quantum confinement, but the presence and extent of Si-O species on the silicon networks seem crucial for determining the spectrum features and intensity of emission. The nanoparticles could hold great potential as quantum dots for applications as luminescence sensors in biology and environmental science.
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