Application of method of laser-induced incandescence to analysis of optical properties of growing particles
The evidence of the change of complex refractive index function E(m) of carbon and iron nanoparticles as a function of their size was found in two-color time resolved laser-induced incandescence (TiRe-LII) measurements. Growing carbon particles were observed during acetylene pyrolisis behind a shock wave and iron particles were synthesized by pulse Kr-F excimer laser photo-dissociation of Fe(CO)5. The magnitudes of refractive index function were determined through the fitting of two independently measured values of particle heat up temperature, measured by two color pyrometry and from known laser pulse energy and E(m) variation. Small carbon particles of about 1-14 nm in diameter had a low value of E(m) ~ 0.05÷0.07 which tends to increase up to a value of 0.2÷0.25 during particle growth up to 20 nm. Similar behavior for iron particles resulted in E(m) rise from ~ 0.1 for particles 1÷3 nm in diameter up to ~ 0.2 for particles > 12 nm in diameter.
Исследована зависимость значения функции коэффициента преломления E(m) от размера углеродных и железных наночастиц методом двухлучевой пирометрии и время-разрешенной лазерно-индуцированной инкандесценции. Рост углеродных наночастиц был исследован при пиролизе 3% ацетилена в аргоне за отраженными ударными волнами. Железные наночастицы были синтезированы при импульсной УФ фотодиссоциации Fe(CO)5 в кварцевом реакторе при комнатной температуре. Величины функции коэффициента преломления наночастиц были найдены при сравнении двух значений температуры максимального нагрева наночастиц, определенных методом двухлучевой пирометрии и при помощи модели ЛИИ, с использованием известной энергии лазерного импульса. Установлено, что маленькие углеродные наночастицы диаметром 1÷14 нм имеют низкое значение E(m) ~ 0.05÷0.07, которое увеличивается до значений 0.2÷0.25 в процессе роста наночастиц до 20 нм. Аналогичная зависимость функции коэффициента преломления от размера была найдена для железных наночастиц, при этом наблюдалось увеличение значений E(m) от ~ 0.1 для наночастиц диаметром 1÷3 нм до значений ~ 0.2 для наночастиц > 12 нм в диаметре.
коэффициент преломления, наночастицы, лазерно-индуцированная инкандесценция, размерный эффект
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