Фотолюминесцентные свойства наночастиц пористого кремния: синтез, характеризация и визуализация в клетках
Аннотация
Цель статьи: В данной работе исследована стабильность фотолюминесцентных (ФЛ) свойств наночастиц микропористого кремния (μПК-НЧ), синтезированного методом электрохимического травления монокристаллического кремния и обработанного методом лиофильной сушки.
Экспериментальная часть: Структурный анализ показал высокопористую архитектуру образца с 2-нм порами и нанокристаллами кремния (нк-Si) размером 3–5 нм. ИК-Фурье спектроскопия выявила наличие Si–O–Si связей, что свидетельствует о поверхностном окислении нк-Si. ФЛ исследования продемонстрировали широкую полосу излучения с максимумом при 685 нм, обусловленную рекомбинацией экситонов в нк-Si. После 5 месяцев хранения спектр ФЛ сместился в коротковолновую область (655 нм) вследствие уменьшения размера нк-Si из-за окисления. Спектры комбинационного рассеяния света показали сдвиг на 1.5 см-1, связанный с ограничением фононов, а также уширение спектра и частичную аморфизацию нк-Si. XANES анализ подтвердил увеличение содержания субоксидов и частичную аморфизацию структуры.
Выводы: Биологические эксперименты показали биосовместимость μПК и сохранение их ФЛ свойств, что подчеркивает их перспективность для биомедицинских приложений, таких как биовизуализация и биосенсорика
Скачивания
Литература
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