Хімія, фізика та технологія поверхні, 2014, 5 (4), 421-437.

Зміна ширини забороненої зони та фотокаталітична активність титанокремнеземів, допованих CuO та NiO



DOI: https://doi.org/10.15407/hftp05.04.421

M. A. Nazarkovsky, V. M. Gun'ko, G. Wójcik, B. Czech, A. Sobieszek, J. Skubiszewska-Zięba, W. Janusz, E. Skwarek

Анотація


Титанокремнезeмні нанокомпозити, доповані CuO або NiO, вивчені методами ультрафіолетової (у режимі дифузного відбиття) та рентгенівської фотоелектронної спектроскопії. Фотокаталітична активність зразків була досліджена в процесі фотоокиснення кофеїну. Значення ширини забороненої зони розраховувались методом Тауца для непрямих дозволених оптичних переходів за винятком зразка при CNiO = 30 мас. %, проаналізованого з урахуванням прямого оптичного дозволеного переходу. Підвищення вмісту оксиду купруму(ІІ) призводить до практично експоненціального зменшення ширини забороненої зони. Ширина забороненої зони композитів, допованих NiO, демонструє майже лінійне сниження зі зростанням CNiO. Згідно з даними РФЕС, допанти повністю відсутні в поверхневому шарі матеріалів. Всі композити виявились більш активними фотокаталізаторами, ніж зразок P25 (Evonik).

Ключові слова


діоксид титану; кофеїн; P25; РФЕС; фотокаталізатори; реактор Heraeus; CuO; NiO

Повний текст:

PDF (English)

Посилання


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DOI: https://doi.org/10.15407/hftp05.04.421

Copyright (©) 2014 M. A. Nazarkovsky, V. M. Gun'ko, G. Wójcik, B. Czech, A. Sobieszek, J. Skubiszewska-Zięba, W. Janusz, E. Skwarek